How do you distinguish between ordinary motors and variable frequency motors?

(1) Higher insulation level requirements

Generally, the insulation grade of the frequency conversion motor is F grade or higher, and the ground insulation and the insulation strength of the turns are strengthened, especially the ability of the insulation to withstand the impact voltage should be considered.

(2) The vibration and noise requirements of variable frequency motors are higher

The variable frequency motor should 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) The cooling method of the frequency conversion motor is different

The frequency conversion motor is generally cooled by forced ventilation, that is, the cooling fan of the main motor is driven by an independent motor.

?

(4) Different requirements for protection measures

Bearing insulation measures should be adopted for variable frequency motors with a capacity exceeding 160KW. The main reason is that it is easy to produce magnetic circuit asymmetry and axial current. When the currents generated by other high-frequency components work together, the axial current will increase greatly, resulting in bearing damage. Therefore, insulation measures are generally taken. For constant power variable frequency motors, when the speed exceeds 3000/min, special grease with high temperature resistance should be used to compensate for the temperature rise of the bearing.

?

(5) The cooling system is different

The frequency conversion motor cooling fan is powered by an independent power supply to ensure continuous cooling capacity.?

Send us Motor Inquiry: [email protected]