It will run continuously on the bench under no load. In electrical systems, voltage is the force required to move electrons. We have a big shop fan with a 115v 1/2 HP electric motor. RE: Electric Motor turns slow under or will not start under load electricpete (Electrical) 17 Sep 09 11:51 If it is wired for 460vac and supplied with 208vac, the torque curve is shifted down by a factor (208/460)^2 < 1/4 (or lower if voltage droops during start). When the belt is hooked up and it has a load it will run for about 30 seconds and cut off, then come back on after about 15 seconds and cut off again after another 10 - 15 seconds. I checked the voltage between the B- and the M- on the speed control module and it was at Battery voltage (36V). Figure 2 Motor Power Factor (as a Function of % Full-Load Amperage) Overloaded motors can overheat and lose efficiency. The remaining power i.e (input electrical power – stator losses) are supplied to rotor as rotor input. Lou asks: I have an E-Z-GO Marathon 36-volt electric golf cart. If the capacitor has failed the symptom is that the motor won't start. Electric motor starting & run capacitor troubleshooting FAQs Questions & Answers about Electric Motor Start-Boost or Run Capacitors Capacitors are electric devices that get an electric motor running at start-up or that help keep a motor running once it has started. Last winter it would run but stall under any snow load. I bought it new on 12/04/1997 and have not ever stored it with gas stabilizer but I change the oil each year. usually that is something that you would know about. It may be possible for some motors to have a connection come loose and have at least one winding effectively drop out. In a motor, power is delivered to the load by converting electrical energy per the following laws of science. Many motors are designed with a service factor that allows occasional overloading. Step on the pedal and it takes off quickly; goes just like new for about 100 yds., then loses power and limps back. Batteries are fully charged and in good condition. You may hear it humming or observe that it's getting hot. The above-mentioned techniques usually solve the issue in most of the cases. A microhmmeter is used to identify this problem. I believe I can replicate the issue in order to drain the batteries, then charge it and start again. Electrical motor loads are calculated from power in kW and full rated load in kW.Following is the formula how to calculate Motor loads. Sometimes you might have had this happen to your golf cart. How to Fix a Golf Cart that Loses Power Quickly. Be careful when you are handling the batteries or the motor as it could cause burns or injuries if done incorrectly. @mmcconn2 all this "when I initiate the load test they move toward the weak range. A motor with a high number of parallel circuits, that is, four and eight wye, will show less power loss when one circuit is open. Cosφ = power factor of the three phase induction motor. On lightly loaded motors with easy-to-start loads, reducing the voltage will not have any appreciable effect, except that it might help reduce the light load losses and improve the efficiency under … Similarly, the motor's pullout torque would be much lower than it would be under normal voltage conditions. Example : We have 1 unit Induction Motor with 30 horsepower (hp),running with 34.9 amps for amperage load and 460 volts 3 phase and power factor value is 0.75 and motor efficiency is 85% Service factor is a multiplier that indicates how much a motor can be overloaded under ideal ambient conditions. I have a 5hp, Craftsman snowblower, 22", dual stage with electric start. Under normal load the motor will run more slowly and will overheat. 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