Applying a voltage higher than the rated one will cause the fan to operate on speeds above the nominal and this could cause the fan to failure due to excessive vibration or incur in a bearing failure (both would take some time to happen). Be sure to apply the recommended voltage. The maximum current flows when the motor is stationary (stalled) and the only obstacle to current flow is the very low resistance of the wire in the coils. For example, if a 460V, 60Hz motor is operated at 380V, 50Hz the motor … The higher the frequency, the faster a motor runs. When the motor is running at no load the speed is very close to synchronous speed. As the core loss will increase, the Power Factor of motor will reduce. The rotating speed of this magnetic field is referred to as "synchronous speed". That makes it go faster, so now the internal voltage source starts offsetting some of the applied voltage. On 2018-12-24 - by (mod) - more on running an electric motor at higher voltage: dual-voltage motor wiring. I believe that the running of the motor light is a high figure,so I replaced the motor with another Leroy Somer and again the same figures were achieved, on load and run light. Increase in load torque = decrease in speed; If you have any questions about this relationship, or how the theory applies to a ‘real-world’ motor, please contact our sales engineers to help with your application. I have a Razor Ground Force that is currently 24v, 250w. So high field motor windings can use smaller wire diameter. 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? Eventually the motor will get to the steady state speed for that voltage. An inverter duty motor can deal with the higher voltage spikes produced by VFDs also can run at very slow speeds without overheating. Motor will be overloaded at rated load. The series motor operates well above the synchronous speed of a conventional AC motor. Forums. 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. Motor Voltage, Amps and Torque Relationship. Three-Phase AC Current Measurement Using Current Transformer Reference Design 2 System Description An electric motor is an essential moving element of any system. This higher voltage is actually due to the counter electromotive force (CEMF), or back electromotive force, produced by the motor itself. Increase in voltage = increase in speed; Load Torque: For a fixed voltage, the speed of the motor is inversely affected by the load. Usually as the voltage goes up the timing on the motor is advanced to help prevent arcing, but this is not always the necessary. The net effect is a reduction in the steady-state output torque; on average, the motor also draws higher current that often pulsates. Hardware Design. AC commutator motors may be either single-phase or poly-phase. Electric motors are required in pumps, compressors, and blowers in typical heating, ventilation, air conditioning … The existing load is a major factor in determining how much of a decrease in supply voltage a motor can handle (see sidebar, below). That is also called the unloaded speed of the motor at that applied voltage. Running a 50Hz design motor over its rated frequency will push it into "field-weakening" status, which means the load capability (torque) you can get from the motor will drop. At higher voltage the speed increases proportionally. 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. DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). 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