Parallel hybrid excitation brushless direct-current fault-tolerant motor

Abstract

The invention discloses a parallel hybrid excitation brushless direct-current fault-tolerant motor. The rotors of both a permanent-magnet synchronous motor and an electrical excitation double-salient-pole motor are arranged coaxially, and the stators are respectively arranged on the left side and the right side inside a shell; the iron cores of the stators share one set of armature winding; an excitation winding is arranged on the iron core of the stator of the electrical excitation double-salient-pole motor; the iron core of the stator of the permanent-magnet synchronous motor is in an unequal tooth-width structure; the wide teeth and the narrow teeth of the iron core of the stator of the permanent-magnet synchronous motor are distributed alternatively; the armature winding is winded on the wide teeth in an inlaid way; no armature winding is winded on the narrow teeth; and the armature winding of the permanent-magnet synchronous motor has the same phase sequence and phase winding distribution as the armature winding of the electrical excitation double-salient-pole motor. The hybrid excitation motor integrates the permanent-magnet synchronous motor and the electrical excitation double-salient-pole motor, realizes the efficient superposition of the induction potential of the two parts and solves the problem on deexcitation protection during the short circuit inside the motor. The hybrid excitation motor has strong fault-tolerant capacity.

Description

technical field [0001] The invention relates to a parallel hybrid excitation motor, in particular to a parallel hybrid excitation brushless DC fault-tolerant motor. Background technique [0002] Compared with traditional electrically excited motors, permanent magnet motors, especially rare earth permanent magnet motors, have significant advantages such as simple and reliable structure, high power density, and high efficiency. Under power generation operation, the output voltage will change with the change of load or speed. The electric excitation motor can adjust the DC or AC excitation current, so that the air gap magnetic field can be adjusted conveniently, but the power density is relatively low compared with the permanent magnet motor, and the structure is complicated, especially when the excitation winding is on the rotor. Brushes are required, so it is difficult to achieve the motor high-speed operation. The hybrid excitation motor introduces auxiliary electric exc...

AI Technical Summary

Problems solved by technology

The former hybrid excitation synchronous motor has a complex structure, the electric excitation method is AC excitation, and the excitation structure and control are complex; the latter has a simple and reliable structure, but there are also problems of large voltage and torque ripple and low power density of the hybrid excitation double salient motor

[0004] It is also feasible to form a parallel hybrid excitation motor with different types of motors. The patent CN100386853C uses a combination of a traditional permanent magnet synchronous motor part and an electric excitation double salient motor part to form a hybrid excitation motor, which realizes bidirectional adjustment of the excitation current and brushless of the entire motor. However, the parallel hybrid excitation motor uses two kinds of brushless motors to be directly combined, and the structures of the two motors are both traditional structures. Due to the difference in the induced potential waveform of the two types of motors, the combination efficiency of the two types of motors is low, which affects its power density. ; In addition, the two parts of the armature windings are independent of each other internally and externally connected in series. Although the excitation current can be adjusted bidirectionally, it still cannot solve the problem of fault demagnetization when part of the armature windings of the permanent magnet motor are short-circuited internally. This makes the motor in high reliability requirements applications under conditions such as aviation power systems are limited

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