Small three-phase high-performance square wave permanent magnetic DC low-speed brushless motor

Abstract

The small-scale three-phase high-performance square-wave permanent-magnet dc brushless low-speed motor comprises: its equivalent tooth / slot number is odd and the integer times as phase number, and has the optimal matching relation between magnetic pole number and the tooth / slot relation with the minimal torque fluctuation and reluctance location torque; the stator iron core is straight slot, integer or fractal format; the winding includes the fractional slot and non-overlap concentrated winding connected by one or more piece wires as star or triangle; and a dc-drive hub without decelerator structure. This invention has high energy efficiency, low torque and loss and noise, saves cost, can be used in different occasions, and fit to produce in large-scale.

Description

technical field [0001] The invention relates to a small three-phase high-performance square-wave permanent magnet DC low-speed brushless motor, especially with high energy efficiency, low torque fluctuation, low reluctance positioning torque, low loss, low noise, low material consumption, The invention relates to a direct drive motor with simple structure, low cost, easy mass production in an automated manner, a novel motor electromagnetic topology, and no reducer, belonging to the field of small motors. [0002] The permanent magnet brushless motor has been widely used in the world economy because of its advantages of no excitation loss, small size, simple structure and maintenance, high power density, high efficiency, and convenient speed regulation, control and drive. It is widely used in electric vehicles, household appliances, industrial drives, information industry, and office automation. [0003] In the field of electric vehicles, the application of permanent magnet br...

AI Technical Summary

Problems solved by technology

[0011] The main problem of the existing split core scheme is that the split unit core segments are usually connected to each other via small-sized convex and concave parts at the left and right ends, and the overall rigidity is poor, which will have a negative impact on the vibration and noise performance of the motor.

Its disadvantages are: the winding frame must be two halves, and the wire must be wound on the iron core section with the frame installed.

The winding cannot be carried out independently from the core segment, which is a common problem in many existing split core solutions, which will inevitably complicate the winding process and increase the cost; in addition, because there are still large notches on the armature core , so the cogging torque ripple has not been significantly reduced, and the increase in magnetic flux leakage caused by the existence of gaps between core segments has not been compensated

[0013] In addition, there are some solutions where the coils on each core tooth often need to be wound separately and broken, and then the wires between the coils need to be connected to each other by welding to form a phase winding

Since this method does not allow for continuous coil winding, it will significantly increase the number of broken ends and may also lead to increased resistance at the connection, poor motor reliability and low production efficiency

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