1. Advantages:

① High-voltage motors can be made very powerful, up to several thousand or even tens of thousands of kilowatts. This is because, at the same output power, the current of a high-voltage motor can be much smaller than that of a low-voltage motor (basically inversely proportional to the voltage). For example, the rated current of a 500kW, 4-pole motor is when the rated voltage is 380V. About 900A, while the rated voltage is only about 30A when the rated voltage is 10kV, so the high-voltage motor windings can use smaller wire diameters, the volume is reduced, and the stator copper loss will be less than that of low-voltage motors.

② For larger-capacity motors, the overall investment in power supply and distribution equipment used by high-voltage motors is less than that of low-voltage motors, and the line losses are small, which can save a certain amount of power consumption. Especially 10kV high-voltage motors can directly use network power supply (the high-voltage power supplied to users in my country is generally 10kV). In this way, the investment in power supply equipment (mainly transformers) will be less, the use will be easier, and the failure rate will be lower. will decrease.

2. Disadvantages:

① The cost of windings is relatively high (mainly caused by insulation), and the cost of related insulation materials will also be high. The insulation process is more difficult and requires more man-hours.

② The requirements for the use environment are much stricter than those of low-voltage motors.