Hello: It is mainly easy to produce asymmetry of magnetic circuit and also produce shaft current. When the current generated by other high-frequency components acts together, the shaft current increases significantly, resulting in bearing damage. generally necessary to take insulation measures. 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 capacity.
2. Differences in the design of ordinary motors and variable frequency motors
1. Electromagnetic design
For asynchronous motorsnes, the main performance considerations when redesigning the engine. The parameters are overload capacity, starting performance, efficiency and power factor. As for the variable frequency motor, since the critical slip is inversely proportional to the power frequency, it can be started directly when the critical slip is close to 1. Therefore, the overload capacity and starting performance no longer have need to be considered too, but the key problem to solve is how to improve engine performance. Adaptability to non-sinusoidal power supplies.
2. Structural design
In structural design, it is also important to consider the impact of non-sinusoidal power supply characteristics on the insulation structure, vibration, noise cooling method, etc. of the variable frequency motor.
KnownTechnical Sessions-Technical Support-Nanjing Limaisheng Robot Co., Ltd.
1. The operating speed of the engine can change in a wide range, so it can work well with the corresponding generator to achieve the fuel saving target;
2. The motor can operate in the high speed range, so it produces the same power, but the weight and volume of the motor are much smaller. In terms of terminology, this means increased power and high specific power;
3. The alternator has a high operating speed, which also reduces weight and volume;
4. from points 2 and 3, it also saves a lot of metal materials;
5. The output power supply is high quality - pure sine wave output with very low harmonic content;