Semi direct drive permanent magnet motor

Abstract

The invention provides a semi direct drive permanent magnet motor. A motor stator is mounted on the inner side of a motor housing. The motor stator is provided with a motor winding. A reducer input shaft penetrates through a reducer housing and a connection end cap and is mounted in the motor housing. The connection end cap is fixed on the reducer housing. The reducer input shaft is connected witha motor rotor through a shaft sleeve. The shaft sleeve end part is fixed on the reducer input shaft through a shaft sleeve barrier board. According to the invention, the semi direct drive permanent magnet is adopted for replacing a prior asynchronous motor and belt for driving. The invention has advantages that (1) the drive part is reduced in space occupancy; (2) a belt wheel is saved and belt maintenance and change are saved and influence on conveying efficiency due to belt pre-tightening force can be avoided; (3) influence on energy efficiency of the permanent motor due to load rate is almost none and the motor keeps high energy efficiency operation all the time, so that an energy conservation effect is distinct; (4) a reducer is used for fixing the motor stator and is connected with arotor coaxially, so that a simple and reliable structure is realized and a low cost is achieved.

Description

technical field [0001] The invention relates to the technical field of pumping units, in particular to the driving technology of the reducer of the pumping unit. Background technique [0002] The pumping unit is a kind of machine equipment for oil extraction. The existing structure of the pumping unit is usually to hang a large-diameter pulley on the input shaft of the reducer, and it is driven by an asynchronous motor through a belt. This driving structure has the following disadvantages: [0003] (1), the drive volume is large; [0004] (2) The belt is severely worn, frequently replaced, and the maintenance workload is heavy; [0005] (3) It is difficult to adjust the tightness of the belt, and the transmission efficiency is unstable and generally low; [0006] (4) The load rate changes greatly during the operation of the pumping unit, and the power factor and efficiency of the asynchronous motor are relatively low under the condition of large load rate fluctuations. C...

AI Technical Summary

Problems solved by technology

[0003] (1), the drive volume is large;

[0004] (2) The belt is severely worn, frequently replaced, and the maintenance workload is heavy;

[0005] (3) It is difficult to adjust the tightness of the belt, and the transmission efficiency is unstable and generally low;

[0006] (4) The load rate changes greatly during the operation of the pumping unit, and the power factor and efficiency of the asynchronous motor are relatively low under the condition of large load rate fluctuations

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