Separable transformer type double-stator brushless double-fed motor

Abstract

The invention discloses a separable transformer type double-stator brushless double-fed motor which comprises an outer stator, a cup-type rotor, an inner stator and a rotating shaft sequentially from outside to inside. The outer stator, the cup-type rotor and the inner stator are coaxial and independent from one another, the rotor is fixed on the rotating shaft, an outer air gap is formed between the outer stator and the cup-type rotor, and an inner air gap is formed between the rotor and the inner stator. The separable transformer type double-stator brushless double-fed motor is of a novel motor structure provided based on a brush double-fed motor operating principle through structural equivalence. A separable transformer composed of the inner layer of the rotor and the inner stator transmits rotor current and voltage of the double-fed motor to the side of the inner stator in a contactless mode, and accordingly functions of an existing brush double-fed motor are realized completely; however, an electric brush slip ring, low in reliability and needing scheduled maintenance, in the brush double-fed motor is omitted, thus the separable transformer type double-stator brushless double-fed motor has high application value in high-reliability, maintenance-free, low-cost variable-frequency speed control occasions.

Description

technical field [0001] The invention relates to the field of brushless motors, in particular to a double-stator brushless double-fed motor with separable transformers. Background technique [0002] The traditional doubly-fed motor is a wound-rotor asynchronous motor, and the rotor winding rotates with the rotor. The voltage and current in the rotating winding must be led out by conduction through the use of brush slip rings. Therefore, the doubly-fed motor has two electrical ports and one mechanical port, has good frequency conversion and speed regulation performance, and is widely used in megawatt-level wind power generation systems and high-performance drives. However, the existence of the brush slip ring leads to poor reliability of the motor and high maintenance costs. The de-energization and brushing of brushed doubly-fed motors has always been the focus of people's research. [0003] Patent Publication No. CN102163896A provides a brushless doubly-fed motor, the surfa...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: In order to solve the problem of brush slip rings in traditional doubly-fed motors, a separable transformer in the field of non-contact power transmission is introduced into doubly-fed motors, and a separable transformer-type double-stator brushless doubly-fed motor is proposed. Solved the deficiencies of the existing technology

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