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Why do motors use double squirrel cage rotors?
source：未知 time：2024-06-19 11:05nbsp; click：
In the process of motor design, efforts should be made to simplify the manufacturing process, with the premise of ensuring that the motor performance meets the requirements. However, in order to meet special operating requirements, necessary measures are often required in the design stage.
For squirrel cage motors, starting is always a very critical performance requirement. How to solve the correlation between starting performance and other performance is very important. In order to improve the starting performance of squirrel cage motors, we talked about deep groove rotors before. Today, our topic is double squirrel cage rotor motors.
Double squirrel cage means that the rotor part includes two cages, namely an inner squirrel cage, which is the running cage, and the other is an outer squirrel cage, which is the starting cage. The outer cage has a smaller conductor area. There are two common double squirrel cage rotors. One is a copper bar double cage, in which the starting cage conductor material is brass or bronze with a larger resistivity, and the running cage conductor material is wood copper. The other is a double squirrel cage made of cast aluminum.
The double-cage motor also uses the skin effect to improve the starting performance of the motor. When the motor starts, the current mainly passes through the outer cage. Given the special characteristics of the outer cage bar area and material, the starting current is effectively limited and the starting torque is guaranteed.
The double-cage motor has good operating characteristics, a large starting torque, can start with rated load, and, under rated load, the motor can have a high speed at the same time.
Compared with the deep-slot rotor, the diameter-height distance between the inner and outer cages in the double-cage rotor slot, the adjustment of the inner and outer cage bar area and shape are effective variables for optimizing the motor performance parameters, thereby achieving the design requirements of different load characteristics, which is the advantage of the double-cage motor.
However, given the fact that the double-cage motor has a large rotor leakage reactance, the corresponding motor power factor and maximum torque will also be reduced to varying degrees.
In addition to the typical deep slot and double squirrel cage rotor, in order to improve the starting problem of squirrel cage motors, bottle-shaped slots with large bellies and small mouths, trapezoidal slots and "convex" slots are also available.
Above we talked about the design comparison of motor slots, but from the perspective of manufacturing process, the theoretical advantages may not be realized in the process. For motor products, we have experienced the process of unified design. Especially at that time, everyone was very cautious about the changes in the unified design, but under such conditions, the final quality level of motors with the same scheme was uneven. Similarly, the slot shape improvement measures to improve the starting performance of the motor must match the process level and equipment level of the manufacturer.
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