Thank for the comment, Chris. Hardware Design. Am I right in thinking that 1080 watts running at a slow RPM/36 volts would develop the same heat as 1080 watts at a faster RPM/48 volts? Re: Running a forklift motor at higher voltage? But how does this affect a scooter or go kart? I am trying to understand how changing the voltage (upgrade to 36v or 48v) compares with upgrading the motor wattage (500w, 750w, or 1000w). If an open rotor is suspected with an assembled motor, perform a single-phase open rotor test. More often than not, a motor is going to be overloaded for some period of time, so if the motor is operating with under-voltage, the possibility of failure increases. An AC motor is an electric motor driven by an alternating current (AC). When the motor is running at no load the speed is very close to synchronous speed. Current is related to torque, voltage to speed. I understand the basic of voltage times amperage equals watts. Not true. Arduino Forum > Using Arduino > Motors, Mechanics, Power ... so you need a higher voltage to get the same current. There are, however, applications in which this can actually work. This is because, in the same output power, current high voltage motor than low voltage motor current is much smaller. In fact, running a motor at lower than nominal voltage (and, therefore, slower than nominal speed) can result in less brush and commutator wear (for brushed motors), lower current consumption, and longer motor life. The fan is an electric DC motor. That is also called the unloaded speed of the motor at that applied voltage. My thinking tells me that the less amperage at higher voltage would be easier on the system, or is it just down to total watts period? There are some motor and circuit voltage combinations which should be avoided. The net effect is a reduction in the steady-state output torque; on average, the motor also draws higher current that often pulsates. The rotating speed of this magnetic field is referred to as "synchronous speed". For example: 500KW, the rated current of the three-phase AC motor 4 at rated voltage of 380V is about 900A, and the rated voltage of 10KV is about 30A. over the base motor speed) only in the de-fluxing region that is constant power. You will have to check the motor datasheets to make sure you got bit torque … Increase in voltage = increase in speed; Load Torque: For a fixed voltage, the speed of the motor is inversely affected by the load. The situation is even worse in the circular saw scenario. Be sure to apply the recommended voltage. If you apply too few volts, the motor will not work, whereas too many volts can short windings resulting in … If the motor has a fan then that will also help to keep it cooler at high rpm. The series motor operates well above the synchronous speed of a conventional AC motor. Motor over-speed is possible (i.e. In the example of the 120/240 volt ac motor yes you would have twice the voltage and twice the amperage if the motor … Three-Phase AC Current Measurement Using Current Transformer Reference Design 2 System Description An electric motor is an essential moving element of any system. Motor Voltage, Amps and Torque Relationship. At 110 percent voltage, the motor will actually have a 21 percent higher overload capacity, but at 90 percent, the capacity will decrease by 19 percent. • Power factor improves with lower voltage and drops sharply with higher voltage. AC commutator motors may be either single-phase or poly-phase. When we say the current is reduced it is compared with 6x rated current. The actual speed of the motor is less than its synchronous speed with the difference between the synchronous and actual speed referred to as slip. Internal algorithms adjust the voltage based on pre-programmed times to increase the current and torque to start the motor and/or decrease them to stop it. Forums. Current increases only to the extent the load (or motor mechanical losses) require higher torque at higher speed. I have a Razor Ground Force that is currently 24v, 250w. If the load is light, the motor can take less time to start than the programmed value. In these applications, the drive is programmed to provide full voltage at 120 hertz and then reduces voltage proportionally as … As with three phase AC and Brushless DC motors, controls can be used with DC motors. The AC motor commonly consists of two basic parts, an outside stator having coils supplied with alternating current to produce a rotating magnetic field, and an inside rotor attached to the output shaft producing a second rotating magnetic field. • Inrush current goes up with higher voltage. 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