Measures to reduce the additional loss when asynchronous motor load
Although the additional loss during load accounts for a small part of the input power of each asynchronous motor, the total amount of power consumed by this loss is still considerable due to the wide range and large number of cage-type rotor asynchronous motors. Especially for the high-efficiency motors that are currently being promoted, the significance is even more. In recent years, research work on how to reduce these losses has been carried out at home and abroad.
For small and medium-sized asynchronous motors, the larger proportion of the additional losses during load is the high-frequency loss, and the base-frequency additional loss generally accounts for a small proportion. In order to reduce the high frequency additional loss, the following measures can be taken.
●Use various stator winding types with less harmonic content. For example, double-layer short-distance distributed windings can be used. In small asynchronous motors, some may replace single-layer windings with single-layer windings. Method winding (the winding has less phase band harmonic content).
● Use a close groove fit.
● Use chute, pay attention to improve the rotor cast aluminum process or use other processes (such as low pressure casting instead of pressure casting, but the former is less productive) to increase the contact resistance between the bar and the core.
Additional losses when DC motor loads
The additional losses when DC motor loads are generally small and are usually not calculated in detail. For motors without compensation windings, it is generally taken as 1% of the output (generator) or input (motor) power, and 0.5% for motors with compensation windings.
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