Kaifeng Hengda Motor Co., Ltd.
Address: Kaifeng Economic and Technological Development Zone
Sales Office: 0371-69382277
Mobile phone: 18103712151
It can be seen from the structural differences between high-power high-efficiency motors and high-power variable-frequency motors:
(1) Higher insulation level requirements
Generally, the insulation level of the frequency conversion motor is F level or higher. Strengthen the insulation strength to the ground and the insulation of the turns. In particular, the ability to withstand the shock voltage of the insulation must be considered.
(2) Higher vibration and noise requirements for variable frequency motors
The variable frequency motor must fully consider the rigidity of the motor components and the whole, and try to increase its natural frequency to avoid resonance with each force wave.
(3) Different cooling methods for variable frequency motors
Variable frequency motors generally use forced ventilation cooling, that is, the main motor cooling fan is driven by an independent motor.
(4) Different protection measures are required
Bearing insulation measures should be adopted for variable frequency motors with a capacity exceeding 160KW. The main reason is that the asymmetry of the magnetic circuit is easy to occur, and the shaft current will also be generated. When the currents generated by other high-frequency components are combined, the shaft current will increase greatly, which will cause bearing damage, so insulation measures are generally taken. For constant power variable frequency motors, when the speed exceeds 3000 / min, special high temperature resistant grease should be used to compensate for the temperature rise of the bearing.
(5) Different cooling systems
Variable frequency motor cooling fan adopts independent power supply to ensure continuous cooling capacity