How to distinguish between ordinary motors and variable frequency motors?
Release time:
2021-03-03 17:13
The structural difference between ordinary motors and variable frequency motors
1. Higher insulation level requirements
Generally, the insulation level of variable frequency motors is Class F or higher. The insulation strength to ground and the insulation strength of the wire turns should be strengthened. In particular, the ability of the insulation to withstand impulse voltage should be considered.
2. The vibration and noise requirements of variable frequency motors are higher
The variable frequency motor must fully consider the rigidity of the motor components and the entire body, and try to increase its natural frequency to avoid resonance with each force wave.
3. Variable frequency motors have different cooling methods
Frequency conversion motors generally use forced ventilation cooling, that is, the main motor cooling fan is driven by an independent motor.
4. Different requirements for protective measures
Bearing insulation measures should be adopted for variable frequency motors with a capacity exceeding 160KW. Mainly, it is easy to produce magnetic circuit asymmetry, and also produce shaft current. When the current generated by other high-frequency components acts together, the shaft current will greatly increase, resulting in bearing damage, so insulation measures are generally required. 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 increase of the bearings.
5. Different cooling systems
The variable frequency motor cooling fan is powered by an independent power supply to ensure continuous heat dissipation.
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