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What Is The Difference Between A High Voltage Motor And A Low Voltage Motor?
- Jan 07, 2019 -

(1) The power can be made very large, up to several thousand or even tens of thousands of kilowatts. This is because, when outputting the same power, the current of the high-voltage motor can be much smaller than that of the low-voltage motor (essentially inversely proportional to the voltage). For example, the rated current of a 500kW, 4-pole three-phase AC motor at a rated voltage of 380V is about 900A, and when the rated voltage is 10kV, it is only about 30A. Therefore, the high voltage motor winding can be used with a smaller wire diameter. As a result, the stator copper loss of the high voltage motor is also smaller than that of the low voltage motor. For high-power motors, when low-voltage power is used, a large-area stator slot is required due to the need for a thicker wire, so that the diameter of the stator core is made large, and the volume of the entire motor is also large.

(2) For large-capacity motors, the power supply and power distribution equipment used in high-voltage motors have less overall investment than low-voltage motors, and the line loss is small, which can save a certain amount of power consumption. In particular, the 10kV high-voltage motor can directly use the grid power supply (the high-voltage power supplied to users in China is generally 10kV), so that the investment in the power supply equipment (mainly the transformer) will be less, and the use rate is also simpler. Will be less.