A trapezoidal rotor tooth structure sinusoidal doubly salient motor and its design method

Abstract

The invention discloses a sinusoidal doubly-salient motor with a trapezoid rotor tooth structure and a design method of the sinusoidal doubly-salient motor. The sinusoidal doubly-salient motor is composed of stators and rotors. The stators and the rotors are both of a salient pole tooth groove structure. The number of stator teeth and the number of rotor teeth meet the relation of 6 / 4N, wherein N=1, 2, 3...; stator tooth grooves are identical in width, armature windings and exciting windings (or magnetic steel) are embedded in the stator tooth grooves, and the rotors are of the trapezoid tooth structure and are distributed in a lateral symmetric mode. The design method is used for optimizing the widths of the rotor teeth and the widths of rotor tooth grooves, the widths of the narrow sides of the rotor teeth are equal to those of the stator teeth, the widths of the wide sides of the rotor teeth are twice those of the stator teeth, and the optimal trapezoid wave rotor tooth structure is formed. Under the exciting of the exciting windings or the magnetic steel, in the rotating process of the rotor teeth, sinusoidal counter potential waveforms are sensed in three-phase armature windings of the stators of the doubly-salient motor.

Description

technical field [0001] The invention relates to the structural design and optimization of a doubly salient motor, and belongs to the field of motor structural design. Background technique [0002] In recent years, as the price of rare earth permanent magnet materials has been increasing year by year, the cost of permanent magnet synchronous motors has become an important factor that limits its use in various applications, and due to the difficulty of magnetic field adjustment in permanent magnet motors, weak To achieve the expansion of the speed range by magnetism, it is necessary to apply reverse current on the direct axis to achieve field weakening control. Not only must the magnet steel design of the permanent magnet motor be adjusted to change its AC and direct axis inductance values, but also the field weakening can be realized through DC current. It not only increases the capacity of the drive converter, but also may cause permanent demagnetization of the permanent mag...

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Problems solved by technology

However, due to the single-tooth distribution of the field winding of the variable reluctance motor, that is, the field winding is embedded in each slot of the stator, the distribution of the field winding corresponding to the 12-pole stator structure is relatively complicated, and its ends are also greatly increased. The slot full rate also increases; in order to improve the sinusoidalization of the back EMF of the motor, the structure of the stator and rotor needs to be further optimized, and in order to prevent the asymmetrical vibration caused by the number of poles, the number of rotor poles should be at least 10 The high number of poles puts forward higher requirements on the switching frequency of the inverter during high-speed drive operation. Under the condition that the switching frequency of current switching devices such as IGBT is limited, the high number of poles limits the high-speed operation of the motor. control performance

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