Composite-rotor brushless double-fed alternating current motor

Abstract

The invention discloses a composite-rotor brushless double-fed alternating current motor which comprises a stator, a rotor, a rotary shaft and a controller, wherein a power winding of the stator is connected with a power supply, and a control winding is connected with the power supply through the controller. The power winding and the control winding have 2p and 2q poles respectively, wherein 2p is greater than 2q plus 2. The rotor comprises a rotor core and a magnetic isolation sleeve, the rotary shaft is made from magnetic material, and the magnetic isolation sleeve is made from non-magnetic material and is mounted between the rotor core and the rotary shaft. (p+q) inverted trapezoidal grooves are uniformly distributed on the outer edge of the rotor core; a radial open groove is arranged between every two adjacent inverted trapezoidal grooves; and a radial narrow groove is arranged between each inverted trapezoidal groove and the open groove. The rotary shaft made from the magnetic material can be replaced by a rotary shaft made from the non-magnetic material, and the magnetic isolation sleeve is cancelled at the same time. The invention has the beneficial effects that: the electromechanical energy conversion efficiency and performance of the motor are improved, the structure is simple, the cost is low, the machining process is easy, and the cost performance of the brushless double-fed motor is increased.

Description

Technical field [0001] The invention relates to an AC motor, in particular to a composite rotor brushless double-fed AC motor. Background technique [0002] In the existing single-motor brushless double-fed AC motor, two sets of windings with different pole numbers are embedded on the stator core of the motor, which are used as power windings and control windings. The rotor mainly has a wound rotor (including single-layer concentric short-circuit windings). And double-layer distributed short-pitch winding) and reluctance rotor (including axial or radial laminated reluctance rotor and salient pole reluctance rotor with cogging) structure. [0003] The advantage of the above-mentioned wound rotor brushless doubly-fed motor is that the rotor manufacturing process is similar to that of the traditional wound rotor induction motor, which is easy to process and manufacture. The disadvantage is that the rotor winding loss is large and the material is used more. The advantages of the axial...

AI Technical Summary

Problems solved by technology

[0003] The advantage of the above-mentioned wound rotor brushless double-fed motor is that the rotor manufacturing process is similar to that of the traditional wound rotor induction motor, which is convenient for processing and manufacturing. The disadvantage is that the rotor winding loss is large and the material used is more

The advantages of axial lamination and radial lamination reluctance rotor brushless doubly-fed motors are that the rotor structure has a good modulation effect on the magnetic field generated by the stator winding current, and the rotor loss is small. The disadvantage is that the manufacturing process is complicated, not only the cost is high, And it is difficult to process and manufacture the rotor of large brushless doubly-fed motor

The salient pole reluctance rotor with slots only on the rotor core has the advantages of simple structure and low cost, but its structure has a poor modulation effect on the magnetic field generated by the stator winding current, resulting in poor performance of the brushless double-fed motor

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