Dual-stator brushless double-fed motor

Abstract

The invention discloses a dual-stator brushless double-fed motor. The motor comprises an outer stator, a rotor, an inner stator and a bidirectional rectification inverter, wherein a 2p-pole stator winding on the outer stator is a power winding directly connected with a power grid; a 2q-pole stator winding on the inner stator is a control winding connected with the power grid through the bidirectional rectification inverter; the rotor is provided with two layers of squirrel cages; guide strips of the two layers of squirrel cages are correspondingly connected at one end of the rotor; and the guide strips of the two layers of squirrel cages are respectively short-circuited through two end rings at the other end of the rotor. The dual-stator brushless double-fed motor has excellent adaptability, can be designed into not only a variable-speed constant-frequency generator but also a constant-frequency adjustable-speed motor, has a simple and compact structure, is high in power density, and has high reliability and low operation and maintenance costs due to omission of a brush slip ring.

Description

technical field [0001] The invention belongs to the technical field of motors and their control, and relates to a double-fed variable-speed constant-frequency generator / motor. Background technique [0002] As the whole society continues to pay attention to energy and environmental issues, the development and utilization of renewable energy is showing a trend of accelerated development. Wind energy exists widely on the earth and is currently one of the most mature renewable energy sources in our hands. A wind turbine is a device that converts mechanical energy into electrical energy in a wind power generation system, and its performance directly affects the quality and conversion efficiency of the output electrical energy. [0003] At present, the generators used in the world's popular high-power wind power generation systems mainly include the following types: [0004] 1. Double-fed asynchronous wind turbine [0005] In the doubly-fed asynchronous wind power generation sy...

AI Technical Summary

Problems solved by technology

The axial cascaded brushless doubly-fed motor is formed by axially cascading two asynchronous motors, one is a power machine and the other is a control machine. Due to the existence of the winding end, the two axially cascaded stators There must be a certain distance between them, the utilization rate of the common rotor is low, the system occupies a large space, and the power density is low

Shared stator core type brushless double-fed motor has only one stator core, on which are placed two sets of windings with different numbers of pole pairs, one set is power winding, the other set is control winding, the winding structure is complex, the slot utilization rate is low, and the two There is a direct magnetic coupling between the sets of windings

At the same time, the squirrel cage rotor used has a special structure and needs to be specially designed

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