Permanent magnet synchronous motor rotor, motor, refrigeration compressor, and motor production method

Abstract

The invention provides a permanent magnet synchronous motor rotor for a refrigeration compressor, and a dynamic balance adjustment method. The rotor comprises a rotor core and permanent magnets, wherein the rotor core is formed by the overlapping of a plurality of punching sheets. The punching sheets comprise common punching sheets and balance punching sheets, wherein the balance punching sheets are disposed at two sides of the common punching sheets. The balance punching sheets are uniformly provided with a plurality of through holes in a peripheral direction around the axis, and the through holes are overlapped to form a balance hole. The balance hole has a certain depth in a direction parallel to the axial direction of the rotor core. The permanent magnets are uniformly arranged around the axis of the rotor core. The rotor is simple in manufacturing technology, and is low in cost. Before the permanent magnets are placed, the punching sheets are provided with the dynamic balance holes in advance, and a steel piece of a motor does not need to be drilled, thereby avoiding the trouble of scrap iron, saving the operation of removing the scrap iron, and reducing the risk of failure of the compressor. After the rotor is installed, a dynamic balance test is carried out and the unbalance position and weight are determined. According to a testing result, balance nails with different lengths are inserted into the balance holes. The method is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a permanent magnet synchronous motor rotor for a refrigeration compressor, a motor, a refrigeration compressor, and a production method for the motor. Background technique [0002] The stator structure of the online start permanent magnet motor is the same as that of the ordinary induction motor, but the rotor structure is more complicated than that of the ordinary induction motor. There are both aluminum slots for starting and permanent magnets for excitation. In order to provide space for permanent magnets and obtain higher efficiency, the aluminum end ring of this rotor is usually designed to be very thin, which makes it impossible to adjust the dynamic balance on the aluminum end ring. Therefore, this method of adjusting the dynamic balance of the motor generally adopts the method of calibrating the dynamic balance on the silicon steel sheet or using dynamic balancing mu...

AI Technical Summary

Problems solved by technology

[0003] But these two methods of adjusting dynamic balance have their own disadvantages. First, the method of drilling and adjusting the dynamic balance on the silicon steel sheet of the motor is difficult to clean the iron filings due to the action of the permanent magnet, and the compressor has very high requirements for the cleanliness of the motor. High, does not allow impurities in the compressor system, usually a lot of labor is spent on removing iron filings

The method of using dynamic balance mud to stick to the aluminum end ring to adjust the dynamic balance, for the sealed motor, due to the circulation of the oil circuit in the whole system, the dynamic balance mud is easy to fall off, resulting in system damage

[0004] To sum up, it is a technical problem to be solved urgently by those skilled in the art to find a kind of equipment or method that can realize the adjustment of dynamic balance without producing iron filings that are difficult to clean or easy to fall off.

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