Outer rotor permanent magnet synchronous traction machine

Abstract

The invention discloses an outer rotor permanent magnet synchronous traction machine comprises a machine seat, a rotor assembly, stator windings, a traction wheel, an encoder and a brake. The machine seat is provided with a rotary shaft. The rotor assembly comprises a hub, a permanent magnet pressing plate and permanent magnets. One end of the hub is fixed to the rotary shaft, and the other end of the hub is provided with a groove. The permanent magnet pressing plate is fixed in the groove and is provided with a plurality of clamping combining grooves at equal intervals. Each clamping combining groove extends in the axial direction of the rotary shaft, and the shape of each clamping combining groove adapts to the shape of the permanent magnets. One permanent magnet is clamped in each clamping combining groove. The stator windings are fixed on the machine seat and correspond to the permanent magnets. The traction wheel is installed on the hub and is located on the outer side of the machine seat. The encoder is arranged between the machine seat and the rotary shaft. The brake is arranged on the machine seat. The outer rotor permanent magnet synchronous traction machine is simple in structure, simplified in process and reasonable in stress, tangential stress of the permanent magnets can be counteracted, the permanent magnets are distributed evenly, and thus the uniformity of a magnetic field is ensured.

Description

technical field [0001] The invention relates to the technical field of elevators, in particular to an outer rotor permanent magnet synchronous traction machine with a simple structure that can offset the tangential force of a permanent magnet. Background technique [0002] The gearless permanent magnet synchronous traction machine with low speed and high torque characteristics has attracted more and more attention from the elevator industry due to its advantages of energy saving, small size, stable low speed operation, low noise, and maintenance-free. The traction machine is mainly composed of a permanent magnet synchronous motor, a traction wheel and a braking system. [0003] In the existing outer rotor permanent magnet synchronous traction machine, due to the outer rotor and radial braking structure, the fixed surface of the permanent magnet of the hub uses a machined circumferential surface. The magnets need to be spaced apart. There are two main ways to fix the tradit...

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Problems solved by technology

The other is to open a counterbore on the permanent magnet and use screws to fix it on the hub. The problem with this structure is: since the permanent magnet material is sintered NdFeB, the material properties are relatively brittle, and the hole is opened on the permanent magnet. And it is easy to break the permanent magnet when using screws to fix it

In addition, the above two methods have the problem of uneven distribution of permanent magnets, resulting in uneven magnetic fields, and because the permanent magnets are subjected to tangential forces when the traction machine is working, this structure is easy to cause the screws to be cut off due to long-term force

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