Low-speed and high-torque motor with magnetic gear

Abstract

The invention provides a low-speed and high-torque motor with a magnetic gear. The low-speed and high-torque motor comprises an inner rotor, an adjustable magnetic ring and a stator which are coaxially and sequentially arranged from inside to outside, wherein a permanent magnet is arranged in the inner rotor; an armature winding for generating a rotating magnetic field and an electromagnet for generating a constant magnetic field are arranged in the stator. By adopting the electromagnet to generate the constant magnetic field in the stator and to replace a permanent magnet in the stator, the usage of the permanent magnet can be reduced, so that the length of an air gap on an outer layer is reduced, and further the coupling degree of an armature winding magnetic field and a permanent magnet magnetic field of the inner rotor is improved.

Description

technical field [0001] The invention relates to the field of power transmission equipment, in particular to a magnetic gear low-speed high-torque motor. Background technique [0002] Direct drive low-speed high-torque motors are in great demand in many occasions, such as wind power generation, ship propulsion and other technical fields. In traditional power equipment, high-speed motors are often used to drive multi-stage reduction gearboxes. The reduction gearbox generally adopts a mechanical gearbox, which relies on the meshing between teeth to transmit torque. It is a contact transmission method, and its work often requires an oil-lubricated environment. After overloading, the gears are easy to break, so regular maintenance is required. In addition, the reduction gearbox used is relatively large in size and weight, and it is used in conjunction with a high-speed motor. The two together take up more space and are heavier. [0003] Since the appearance of magnetic gears, ...

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Problems solved by technology

[0004] In the prior art, the magnetic gears, one of the important components of the magnetic gear low-speed high-torque motor, are all permanent magnet excitations, that is, permanent magnets are installed in the stator, so on the one hand, a large number of permanent magnets must be used, increasing the On the other hand, according to the working principle of the magnetic gear low-speed high-torque motor, the magnetic field generated by the armature winding interacts with the magnetic field of the inner rotor permanent magnet to drive the inner rotor to rotate, which in turn drives the magnetic gear's magnetic ring to rotate , therefore, the permanent magnets in the stator will inevitably increase the length of the outer air gap, reduce the coupling degree of the magnetic field of the armature group and the permanent magnetic field of the inner rotor, and reduce the torque output capability of the composite motor

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