Rotor sheet of asynchronously-started PMSM (permanent magnet synchronous motor)

Abstract

The invention relates to the field of the rotor sheet of a PMSM (permanent magnet synchronous motor), and in particular provides a rotor sheet of an asynchronously-started PMSM. The rotor sheet comprises asynchronously-started cage conducting bar slots, magnetic steel slots and a bolt fixing hole. The sheet does not have an interference spindle hole; the plurality of magnetic steel slots are formed at edges of the inner diameter circumference of the sheet in a punching shear mode, and magnet-isolating magnetic bridges, holddown grooves, asynchronously-started cage conducting bar slots at mouse cage parts at outer diameter edges of the fixed holddown grooves and bolt fixing holes in poles are reserved to constitute a high-intensity rotor sheet of the PMSM without coordination of a heating jacket. The rotor sheet has the beneficial effects that the punching efficiency is high, the labor and time are saved, the number of steel plates is reduced, the residual part without a center can be used for punching other small-size motor rotor sheets, and economic benefits in a motor sheet industry are improved greatly.

Description

Technical field [0001] The invention relates to the field of permanent magnet synchronous motor rotor punching. Background technique [0002] Existing three-phase motors and three-phase permanent magnet synchronous motor rotor punching pieces generally have a shaft hole with interference fit. After the lamination is cast aluminum, the shaft is sleeved, which is not a one-stop production line for manufacturers. The semi-finished products needed are supplied by the manufacturer of special punches with shaftless rotors and stators. When they come back, they need to be put into the drying room, heated to the required temperature and put on the rotating shaft. The tightness of the sleeved rotating shaft exceeds the output torque of the motor itself. Many times, even a press with several tonnages cannot press out the shaft. For the rotor of a permanent magnet synchronous motor, the difference in interference fit is the same. The only difference is that the magnetic steel grooves are sy...

AI Technical Summary

Problems solved by technology

When the work is wasted, the cost is high, the mechanical strength is greatly reduced, and the magnetic steel is easily broken by force in the rotor. In the end, the entire rotor including the shaft is scrapped, wasting manpower, material and financial resources.

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