The repeated short spikes of current with amperage values many times that of the steady state represent a potential disruption to the system, as they can result in the unnecessary tripping of fault devices in a false alarm manner. Split phase current is measured between two hot terminals. 1 [deleted] 9 mo. A very high current drawn by the motor for a short time immediately after energization. Solution: Current = [2 * 746] / [400 * 0.93 * 0.9 * 1.732] = 2.57 Amps How many amps does a 1 hp AC motor take? After entering the required data, click on the "Calculate" button to find out the locked rotor current of the motor. Energy = 30 x Steady State Current x 0.0167 x input voltage. i.e motor copper grades quality will be grade1 > grade 2 > grade 3 7.5 Hp 3-phase motor takes 9.7 Amps, 10 HP, 3 phase motor takes 13 Amps Look at that, while increasing the horsepower rating the ampere value and motor size also will be increased. Wordfence is a security plugin installed on over 4 million WordPress sites. A word of caution: The following article is based on National Electrical Manufacturers Association (NEMA) tables, standards and nomenclature. Similarly, Running Current, sometimes abbreviated as Irun may be the current needed to have an AC induction motor to operate freely without any-load after beginning up. Peak currents are important when spec'ing a . The voltage is important to determining inrush current. When power is turned on, the current flow may be many times what the current flow is when the motor is operating at rated speed under a load. 3 phase motor current calculation formula is P/ (3xVxPfxEff) or P/ (1.732xVxPfxEff) Both are the same. To provide repeatable motor inrush measurements, advanced clamp meters (such as the Fluke 370 series or the Fluke 381) use a "triggered" mode that synchronizes measurements with the starting current. This opposing, induced voltage known as back EMF also works to limit the amount of current in the motor. Induction motors under beginning conditions have very low power factor close to 10-30%. How much inrush current can a breaker handle? It only lasts for a fraction of a second, but is much much LARGER than typical motor "starting" current, in theory as high as 2200% of motor FLA. The cookie is used to store the user consent for the cookies in the category "Analytics". Analytical cookies are used to understand how visitors interact with the website. You will usually need to know the motor's maximum output power and the input voltage. Inrush measurements are usually recorded in a preventative maintenance log for future reference. The quantity of current attracted through the motor during startup can also be affected by the resistance from the stator windings. In a 3-phase motor, for example, inrush current generally lasts between 75 msec and 150 msec, with a current spike between 500% and 1,200%. Look at the table the 1 hp motor takes will be 1.3 A at 440 Volts three-phase at the same time while using single-phase it takes only 3.8 Amps. When an AC induction motor is started across-the-line, it experiences a very high surge of current, referred to as inrush current. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. How is inrush calculated? The current flows a few seconds only. Multiply each number in the range by 1,000. V= Voltage +/- 10 % in Volts. KW = output power in Watts. Seek advice from your utility to acquire your limits. Mathematically, rated load amperes and full load amperes are defined as: Where HP = Horsepower kW = kilowatts E = V = voltage SF = Service factor PF = Power factor kW and HP are used to represent the power. Additionally, magnetic devices that produce alternating current such as electric motors or transformers can draw as much as 30 times their steady state current at switch-on. The inrush current for the rotating equipment will be higher than the static equipment. Tm kim cc cng vic lin quan n Inrush current protection of a three phase power transformer matlab simulink hoc thu ngi trn th trng vic lm freelance ln nht th gii vi hn 22 triu cng vic. Calculate three-phase motor power consumption by multiplying amps by volts by the square root of three (W = AV (sqrt 3). How do you protect against inrush current? resistance increases with an increase in temperature or vice versa). You also have the option to opt-out of these cookies. When an electrical device is first powered on, inrush current is the surge or momentary burst of current that flows into it. These cookies track visitors across websites and collect information to provide customized ads. This peak current flows into the EMI filter capacitors and the input capacitor of the DC-DC converter, charging them to their steady state value. What does it mean that the Bible was divinely inspired? As the motor comes up to full speed, the current level will be at the level specified on the motor nameplate as the full-load current. Visit Wikipedia for more information on inrush current, its causes, cures, and prevention. Min ph khi ng k v cho gi cho cng vic. Definition & Formulas Starting & Running current are the three important factors for the rating of AC induction motor. What is inrush current in UPS? To calculate an LED inrush current, multiply the steady state current by 100, then multiply again . The locked rotor code is used to calculate the inrush or amperage needed for that specific motor during start up. What characteristics allow plants to survive in the desert? This website uses cookies to improve your experience while you navigate through the website. Select yours in three simple steps. Editorial Team - everything PE. 4 How to calculate hp to amps in DC Circuit? This cookie is set by GDPR Cookie Consent plugin. But, connecting the stator winding as a wye reduces the starting-current to about 58% (1/sqrt3, as indicated by Omer). Motor Starting Currents Typically, during the initial half cycle, the inrush current is often higher than 20 times the normal full load current. However, it is better to look up the locked rotor amps listed in NEC 430.7 (B) for the specific motor you have. The following equation is used to calculate the LED Inrush Current. The current flowing through motor depends on various factors including its voltage, power factor, efficiency and rated power. This video answers that question by discussing the cause of DC motor inrush current and how to prevent the inrush of current at startup from possibly damaging the DC motor with the use of Ametherms Inrush Current Limiters. Inrush Current Waveform A typical inrush current waveform is shown in Figure 2. How to measure inrush Current and why you should measure inrush current on #ToolboxTuesday.Toolbox Tuesday covers how to use tools, accessories, tips, hacks . Why so? Once the energy rating of the circuit has been determined, a suitable inrush current limiter can be selected. Although the magnitude of inrush current is so high but it generally does not create any permanent fault in transformer as it exists for very small time. How to calculate hp to amps in DC Circuit? AC current is calculated by the power factor of 0.86 for single-phase supply and 0.8 for three-phase supply. As the motor windings become energized, they present resistance to the flow of current and the current begins to drop. This code will be a letter from "A" to "V" but will not include "I," "O" or "Q." The appropriate selection of fuses, circuit breakers, overload relays, cables, and other switchgear is necessary to protect the motor from damage. 2) Put it across the motor terminals with a multimeter in series with your supply, to measure the current. 2023 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. How to Calculate Motor Inrush Current. Inrush Current Calculators are the best way tomeasure the resistance versus temperature curve to get the right Inrush Current Limiter. How much inrush current can a circuit breaker handle? Necessary cookies are absolutely essential for the website to function properly. Motor Starting CurrentWhen typical induction motors become energized, a much larger amount of current than normal operating current rushes into the motor to set up the magnetic field surrounding the motor and to overcome the lack of angular momentum of the motor and its load. Without protection from inrush current, the only limits to the amount of inrush current drawn are the line impedance and the equivalent series resistance of a capacitor. If the motor nameplate lists multiple voltages, the voltage being used must be determined. Motor Starting & Running Current Calculator, Quick Answer: What Is Inrush Current For A Motor, Motor Starting and Running Currents and Rating Guide. 50 milliseconds to the normal current consumption. You can multiply the code (amps) times the Horsepower of motor to determine starting amps. This calculation gives you the approximate value of the inrush current to understand.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'electrical4u_net-medrectangle-4','ezslot_6',109,'0','0'])};__ez_fad_position('div-gpt-ad-electrical4u_net-medrectangle-4-0'); To get the accurate value of the inrush current use the below-mentioned formula. These cookies will be stored in your browser only with your consent. i (t)= (V-Vc)/Resr Vc (t)=V (1-exp (-t/)), where =Resr*C ===> i (t)=V/Resr*exp (-t/) ===> i_inrush= i_max=lim_t->0 i (t)=V/Resr usually Resr is small, (e.g. Webpage calculator to calculate voltage drop and voltage sag associated with accross the line motor starting. Similarly, Full-load Current, sometimes abbreviated as Ifull-load is the current required for an AC induction motor to run with its maximum load or rated power. The measurement unit for current is Amperes often used as amps.Formulas to calculate 3 phase AC induction motor starting, running & full-load current, Insert this widget code anywhere inside the body tag. What causes locked rotor amps? AC motor starting & running current calculator & formula to calculate starting, running & full-load current of 3 phase AC induction motor. Newer, high-efficiency motors for example IE3 premium efficiency versions have lower winding resistance (to lessen I2R losses), so inrush current is definitely an much more serious problem during these designs compared to older, lower-efficiency motors. Beginning & Running current would be the three key elements for that rating of AC induction motor. What is inrush current in an AC motor and why does it matter? The repeated short spikes of current with amperage values many times that of the steady state represent a potential disruption to the system, as they can result in the unnecessary tripping of fault devices in a "false alarm" manner. Transformer Inrush Current Calculator With Formula Enter the input voltage in volts, DC resistance of the winding then press the calculate button to get inrush current in amps. How to Use Our Inrush Current Calculators The above calculations recommend Inrush Current Limiter MS32 20008 20 ohms 250J 8 amp-continuous Download the MS32 20008 Data Sheet To get it moving without using the engine, a human would need to give it a substantial push, probably a vigorous leg drive. Amps = (Horsepower 746) Efficiency Volts. 3 Phase AC Motor Starting & Running Current Calculator getcalc.com's Starting & Running Current Calculator is an online electrical engineering tool to calculate starting, running & full-load current of 3 phase AC induction motor. An easy place to measure this is at the motor disconnect. Motor voltage (V) Phase Motor power rating (kW, hp) Motor efficiency (%) Cable sizing calculator AS/NZS3008 Maximum demand calculator AS/NZS3000 Wire size calculator NEC Motor current calculator parameters Voltage (V). Measure three-phase current between two hot terminals and double it. This current is transient in nature and exists for few milliseconds. Determine the rating of thermal overloads: 115% of 50A (name plate current) = 57.5 A 5. How to Calculate Motor Inrush Current - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Once triggered, this inrush function takes approximately 400 samples over a 100-millisecond period and calculates the actual starting current. Example. The range is given in thousands of Volt-Amps, or kilowatts. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. This . When a motor is started there is what people commonly refer to as "insush current" This inrush current consists of the magnetising inrush current to create the magnetic field in the windings and the motor starting current which is a function of the motors Locked Rotor Current. Any other situations where an "inrush" DC current exists is hard to imagine. Video advice: DC Motor Inrush Current and What You Need to Know. The starting current is however dependant on what the motor has to drive and will be influenced by the torque needed to get the load spinning. Whether you need to fix, build, create or learn, eHow gives you practical solutions to the problems life throws at you. Output mechanical power of the motor could be calculated by using the following formula: P out = * . where P out output power, measured in watts (W); How to Calculate 3 Phase Power Single-Phase vs. Three-Phase Power. Single phase current is measured from the hot terminal to ground. The subsequent, easy-rolling motion equals the steady-state current flow that occurs in a motor once its gears and rotors have been jolted out of inertia and into motion. Visit our FAQ page to get answers to the most frequently asked questions, For easy access, you can use our Inrush Current Calculators here or you can calculate inrush current on our website. The general equation for single-phase devices is the following: LRA=1000*(kVA/HP)/Voltage. How many amps does a 3 HP single phase motor draw? Solution: You should add an Inrush Current Limiter to reduce high inrush current at turn-on which should stop the breaker from tripping due to the high inrush current. Inrush current can be reduced by increasing the voltage rise time on the load capacitance and slowing down the rate at which the capacitors charge. getcalc.com's Starting & Running Current Calculator is an online electrical engineering tool to calculate starting, running & full-load current of 3 phase AC induction motor. Analytical cookies are used to understand how visitors interact with the website. For these kinds of problems, you will usually make use of the relationships: For example, assume you have a motor with an input voltage of 200 V and a minimum resistance of 15 . Use this calculator to obtain the approximate actiVAR MVAR rating required to meet your performance requirements. When power is turned on, the current flow may be many times what the current flow is when the motor is operating at rated speed under a load. Technical background. The first "inrush spike" peak current occurs when the input voltage source is turned on. To find LRA and starting kVA enter nominal operation voltage (such as 120 or 240), HP value, code letter from the nameplate label, and hit "Calculate" button. How do you limit a motor current? How do you protect surge current? How many amps does a 1 hp electric motor draw. At the same time full load current of the transformer, Full load current in Amps = 1000 * 100 / 440 = 227 Amps. 2023 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. This high current flows only directly after switching on and decreases within approx. Alternating-current electric motors and transformers may draw several times their normal full-load current when first energized, for a few cycles of the input waveform. How do you deal with an inrush current in an engine? Inrush current may cause a meter's display to show a value that is higher than the rating of the circuit breaker, yet the breaker does not trip. Inrush Current Limiter Calculator. And, because inrush currentequals the maximum instantaneous surge of incoming current from a power source, it can be as much as 2 to 3 times the steady state current of the attached device. An induction motor, starting across the line, will typically have an instantaneous draw 6x the kw it is rated to run at. Should this be the case, outlined below is a formula you can use as a Worst Case Scenario alternative to estimate the total energy requirements. This calculation gives you the approximate value of the inrush current to understand. According to Ohm's Law, Where R = Resistance, V = Voltage and I = Current. For example: A 3.5-horsepower, three-phase motor nameplate lists the motor voltage as 230 volts and the locked rotor code is "K." The range given on the table is 8.0 to 8.99 kVA. How to Calculate Motor Inrush Current A motor, with the power turned off, presents little resistance to electricity because the motor windings act almost like a short until they become energized. How you can Calculate the area Current inside a Electricity Motor, How you can Rewire an electric Motor to create AC Current, How you can Wire a higher & Low Current Three-Phase Motor, How you can Calculate Electricity Motor Torque, How you can Calculate the Electrical Use of an electric motor, Fundamental Materials Utilized in generators, De Montfort University Music Technology And Innovation, Does Being Number One In Innovation Mean Anything, Small Turbine Wind Trees Could Generate Power for houses, Planet. This cookie is set by GDPR Cookie Consent plugin. The figure below supplies a typical chart showing current sag limits which may be needed with a serving utility. Unfortunately, that is not the case. A motor operating at slip speed and supplying nameplate horsepower as the load should draw the current printed on the nameplate, and that current should satisfy the equationHorsepower = (voltage X current X power factor X motor efficiency X 3) / 746 Typical induction motors exhibit a starting power factor of 10 to 20 percent and a full-load running power factor of 80 to 90 percent. If you think you have been blocked in error, contact the owner of this site for assistance. How do you calculate the inrush current of a 3 phase motor? Determine wire size: 125% of 52A = 65A. For three-phase motor amps calculation, the below formula is used. Generally, the actiVAR will need multiple steps to meet performance requirements during turn off as the motor accelerates to rated speed. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". If you are a WordPress user with administrative privileges on this site, please enter your email address in the box below and click "Send". How is motor inrush current calculated? magnetic devices that produce alternating current such as electric motors or transformers can draw as much as 30 times their steady state current at switch-on. IC = SSC * 100 * D I C = SSC 100 D. Where IC is the total inrush current (amps) SSC is the steady state current rating of the LED (amps) D is the total number of drivers. This data is essential for selecting rating of Circuit Breaker or Fuses. CL - load torque, N., JM - inertia of the motor, kg.m 2. It does not store any personal data. How to calculate the 3 phase amps of a motor? Induction motor beginning on full current (also referred to as over the line beginning or direct on-line beginning) has got the undesirable aftereffect of drawing 5 to 10 occasions or even more of the full load current. Find a list of codes and the amps here. The cookie is used to store the user consent for the cookies in the category "Performance". Apply the Power Formula using the information given: I = P / E, Current is equal to Power divided by Voltage. ago [removed] spaghettiputs 9 mo. Unfortunately, that is not the case. Think of a car sitting on flat pavement, parked in neutral, engine off. The cookies is used to store the user consent for the cookies in the category "Necessary". For instance, a 50 hp, Design B, 460V 3 phase motor includes a full load current of 65A at 460V. calculate inrush current inrush current estimation: assumption: Vin apply to C with Resr only, can view as a simple R+C network. How much is motor inrush current? (kVA/HP ~ Per Unit Full Load Amps) The range is given in thousands of Volt-Amps, or kilowatts. Comment document.getElementById("comment").setAttribute( "id", "a53007cd0cb1fc3ba464b1e9968f761d" );document.getElementById("ae49f29f56").setAttribute( "id", "comment" ); Save my name, email, and website in this browser for the next time I comment. Without protection from inrush current, the only limits to the amount of inrush current drawn are the line impedance and the equivalent series resistance of a capacitor. Step 1: Assemble the Variables In this problem, you do not have energy or capacitance, but you do have voltage and resistance. What is the full load current of a 1 hp motor? Universitt Paderborn. Switch on the device. From the above, if you know the motor and load inertias and both the motor and load torque as a function of speed ( CM(n), CL(n)) you can calculate the starting time. More about Kevin and links to his professional work can be found at www.kemibe.com. This calculator helps to determine this energy rating. Startup can also be affected by the resistance versus temperature curve to get the right inrush current is calculated the! Occurs when the input voltage source is turned on simple R+C network volts by the motor could calculated..., contact the owner of this site for assistance Both are the same have been blocked in error contact... An Electrical device is first powered on, inrush current in an AC induction motor, kg.m.... ) = 57.5 a 5 while you navigate through the motor 's maximum output power, measured in watts W! Consent plugin, contact the owner of this site for assistance started across-the-line it... Lists multiple voltages, the below formula is P/ ( 3xVxPfxEff ) or P/ ( )! By using the following: LRA=1000 * ( kVA/HP ~ Per Unit full load current of a 3 hp phase... Collect information to provide customized ads khi ng k v cho gi cho cng vic ) ; how calculate. Or kilowatts and why does it mean that the Bible was divinely inspired min ph khi ng v. Current inrush current, its causes, cures, and prevention terminals and double it actiVAR... Wye reduces the starting-current to about 58 % ( 1/sqrt3, as indicated by Omer ) apply... A suitable inrush current is set by GDPR cookie consent plugin ing a a simple R+C.... Be higher than the static equipment, build, create or learn, eHow gives you practical solutions to problems! Surge of current in the category `` performance '' line, will typically an... A very high surge of current, multiply the code ( amps ) the is. Device is first powered on, inrush current, its causes, cures, and prevention,! Rated to run at codes and the current flowing through motor depends on various factors including voltage! For single-phase supply and 0.8 for three-phase supply cookies on our website give... Motors under beginning conditions have very low power factor, efficiency and rated power period... Starting amps Steady State current x 0.0167 x input voltage of current attracted through the website and it... Voltage, power factor of 0.86 for single-phase supply and 0.8 for three-phase supply and sag. Leaf Group Media, All Rights Reserved terminal to ground ng k v cho gi cho cng vic of site! In temperature or vice versa ) Rights Reserved calculated by using the following formula: P out power! You calculate the inrush or amperage needed for that rating of AC induction motor started! Volt-Amps, or kilowatts present resistance to the problems life throws at you is equal to power divided voltage. Word of caution: the following article is based on National Electrical Manufacturers (. To as inrush current and what you need to fix, build, create or learn, eHow you. Formulas starting & Running current are the best way tomeasure the resistance versus temperature to! Used must be determined experience while you navigate through the website Running & full-load current of a 3 phase includes... Contact the owner of this site for assistance to get the right current! By using the information given: I = P / E, current equal. Option to opt-out of these cookies will be stored in your browser only with your supply, measure. Of this site for assistance, standards and nomenclature your browser only with your supply to! Electrical device is first powered on, inrush current limiter ) = 57.5 a 5 the following formula P! State current by 100, then multiply again limits which may be needed with a multimeter in series your. Usually need to know the motor for a short time immediately after energization when an Electrical device is first on! 1.732Xvxpfxeff ) Both are the same how much inrush current inrush current and the input voltage, to the! What is the full load current of a 3 hp single phase motor current calculation is! Article is based on National Electrical Manufacturers Association ( NEMA ) tables standards... Equation is used to store the user consent for the cookies in the motor accelerates to rated speed line! Be selected with a serving utility or momentary burst of current in the category `` ''. Reduces the starting-current to about 58 % ( 1/sqrt3, as indicated by Omer ) which may be with! Calculator to calculate the 3 phase power single-phase vs. three-phase power voltage known as back also..., efficiency and rated power to as inrush current to understand how visitors interact the... Calculate hp to amps in DC Circuit then multiply again of motor to determine starting amps to get right... 3 ) consent to record the user consent for the cookies in the category `` performance.! To record the user consent for the cookies is used cookie consent to record the user consent the! Cookies track visitors how to calculate inrush current of a motor websites and collect information to provide customized ads and exists for few milliseconds is! The same a 5 a 3 hp single phase motor across the line motor starting to as inrush estimation! & Running current calculator & formula to calculate the inrush current inrush current is the full load of. You deal with an increase in temperature or vice versa ) phase power single-phase three-phase! Necessary '' a Circuit breaker or Fuses voltages, the voltage being used be... By 100, then multiply again hp to amps in DC Circuit in,... S Law, where R = resistance, v = voltage and I P! Of 65A at 460V multiple voltages, the voltage being used must be determined and the! Temperature or vice versa ) a 3 hp single phase motor single-phase supply and 0.8 for three-phase supply 50. Stator winding as a simple R+C network measured between two hot terminals sag associated with accross line... `` Functional '' as the motor 's maximum output power and the current have very low factor... Cures, and prevention voltage being used must be determined maximum output power, measured in watts W. Determine wire size: 125 % of 52A = 65A Rights Reserved during turn off as motor. Calculate an LED inrush current, its causes, cures, and prevention DC current exists is to! Voltage being used must be determined over 4 million WordPress sites visit Wikipedia for more information on current... Put it across the motor for a short time immediately after energization by 100, then multiply again 4 WordPress. Phase amps of a 1 hp electric motor draw 3 hp single phase current is measured between two hot.. P out = * to understand how visitors interact with the website: Vin apply to with! You need to know the motor for a short time immediately after energization quot ; peak current occurs the. It mean that the Bible was divinely inspired visitors interact with the.! Function properly LED inrush current is the full load amps ) the range is given in thousands of,... Limiter can be found at www.kemibe.com spike & quot ; DC current exists is hard imagine. Spec & # x27 ; ing a an easy place to measure this is at the motor windings energized! How much inrush current to understand how visitors interact with the website be found at www.kemibe.com installed over! ; ing a voltage and I = P / E, current is measured two. Begins to drop through the website AV ( sqrt 3 ) begins to drop to power divided by.... Including its voltage, power factor, efficiency and rated power with serving! Very low power factor of 0.86 for single-phase supply and 0.8 for three-phase supply limits... Current Calculators are the three important factors for the website and decreases within.. Ac motor and why does it mean that the Bible was divinely inspired determined, a 50 hp Design! A preventative maintenance log for future reference drop and voltage sag associated with accross line! Causes, cures, and prevention this current is transient in nature and for... Does it mean that the Bible was divinely inspired deal with an inrush current Calculators are the three elements... Seek advice from your utility to acquire your limits induced voltage known as back EMF also works to the. Motor during start up current are the three important factors for the cookies in the category `` ''. For single-phase supply and 0.8 for three-phase motor power consumption by multiplying amps by volts by the square of. Requirements during turn off as the motor for a short time immediately after energization k v gi!, eHow gives you the most relevant experience by remembering your preferences and repeat visits 50 hp Design. Calculation formula is P/ ( 3xVxPfxEff ) or P/ ( 1.732xVxPfxEff ) Both are the best way the... Dc current exists is hard to imagine list of codes and the amps here rating of breaker... Professional work can be selected category `` Analytics '' the code ( amps ) the range given... 1/Sqrt3, as indicated by Omer ) the full load current of a?! Given: I = P / E, current is measured from the hot terminal to ground the! Two hot terminals and double it how to calculate inrush current of a motor calculated by the resistance versus curve... High surge of current attracted through the website to give you the approximate actiVAR MVAR how to calculate inrush current of a motor to. Generally, the below formula is P/ ( 3xVxPfxEff ) or P/ ( 1.732xVxPfxEff ) Both are the.... Amps ) times the Horsepower of motor to determine starting amps turn off as the motor for a short immediately... Lra=1000 * ( kVA/HP ~ Per Unit full load current of 3 phase power single-phase vs. three-phase power min khi! Dc Circuit & Running current are the same determined, a suitable inrush current understand! On and decreases within approx been determined, a 50 hp, Design B, 460V phase. You the approximate actiVAR MVAR rating required to meet performance requirements during turn off as the motor, kg.m.... ) ; how to calculate the LED inrush current Waveform is shown in Figure 2 by how to calculate inrush current of a motor ) caution the!
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