High voltage motors and low voltage motors differ in the following ways:
1.Voltage Rating
High-voltage motors: usually refers to motors with rated voltage of 1000V and above, and the common voltage levels are 3kV, 6kV, 10kV, and so on.
Low-voltage motors: Generally refers to motors with rated voltage below 1000V, commonly 220V, 380V, 400V and so on.
2.Power
High-voltage motors: generally used in high-power occasions, the power is usually between several hundred kilowatts to thousands of kilowatts, or even higher. For example, high voltage motors are often used to drive large industrial equipment such as crushers in mines and rotary kilns in cement plants.
Low-voltage motors: The power is relatively small, usually ranging from tens of watts to hundreds of kilowatts. In daily life and general industrial production, such as small fans, pumps, machine tools and other equipment, often use low-voltage motors.
3.Structural design
High-voltage motors: Due to the high voltage and high insulation requirements, their windings are usually made of thicker insulating materials and the insulation structure is more complex. In order to reduce magnetic leakage and eddy current loss, the iron core of high-voltage motors usually use higher quality silicon steel sheet, and the core size is relatively large.
Low-voltage motors: insulation requirements are relatively low, the insulation structure is relatively simple, and the thickness of the insulating material of the winding is thin. The choice of core material and size is relatively flexible and can be designed according to specific power and usage requirements.
4.Performance characteristics
High-voltage motors: under the same power, the current of high-voltage motors is relatively small, so the line loss is small and the efficiency is high. However, the starting current of high-voltage motors is large, and it is necessary to use special starting equipment, such as reactors, inverters, etc., to reduce the impact of the starting current on the power grid.
Low-voltage motors: the starting method is relatively simple, can be started directly or using star - triangle start, autotransformer start and other methods. However, in high-power applications, the efficiency may be lower than that of high-voltage motors due to higher current and line losses.
5.Application Scenarios
High-voltage motors: Widely used in large industrial enterprises, such as steel mills, power plants, chemical plants, mines, etc., used to drive large machinery and equipment, such as rolling mills, blowers, feed pumps, ball mills and so on.
Low-voltage motors: the scope of application is even wider, covering various fields such as industry, agriculture, commerce and family, such as a variety of small processing equipment, household appliances, power tools and so on.
6.Maintenance
High-voltage motors: Higher maintenance requirements, the need for regular testing of insulation performance, checking the operation of high-voltage switches, protection devices and other equipment. Due to its complex structure, maintenance is difficult and requires professional technicians and equipment for maintenance.
Low-voltage motors: relatively simple to maintain, mainly to regularly check the motor's operating temperature, sound, vibration and other conditions, as well as bearings, windings and other components for routine inspection and maintenance. Ordinary electricians are generally able to carry out routine maintenance of low-voltage motors and repair of common faults after training.
