Hybrid excitation direct-drive motor

Abstract

The invention discloses a hybrid excitation direct-drive motor in the field of motors. Six inner stator teeth are evenly arranged on the outer side surface of an inner stator yoke in the circumferential direction. An adjustable flux block extends from the outer end of each inner stator tooth in the radial direction. Three adjustable flux block teeth are evenly distributed on a yoke of each adjustable flux block in the circumferential direction. A non-magnetic-conductive and electric-conductive isolation material block is fixedly embedded between the yokes of every two adjacent adjustable fluxblocks. All the adjustable flux block teeth are evenly distributed in the circumferential direction. An inner stator outer groove is formed between every two adjacent adjustable flux block teeth. An exciting winding is placed in each inner stator outer groove. The rotating permanent magnetic field is modulated through the adjustable flux blocks on the inner stator teeth, the permanent magnetic field with low rotating speed is modulated into an effective harmonic air gap magnetic field with high rotating speed, and by controlling the frequency, magnitude and phase position of alternating currents, the air gap magnetic field is adjusted; under the condition of determining the q-axis component of armature currents, flux-weakening exciting currents are introduced, and the constant-torque operation is realized under the conditions of unchanging the voltages of a motor end and accelerating the flux-weakening.

Description

Technical field [0001] The invention relates to the field of electrical engineering and motors, and is a hybrid excitation direct drive motor, which is suitable for application fields with high torque density and wide speed range requirements such as variable speed drive systems. Background technique [0002] The direct drive form of the permanent magnet motor is one of the main means to improve the operating efficiency of the system and simplify the system structure. However, due to the constant excitation field generated by the permanent magnet, the development of the permanent magnet motor is hindered, especially in the variable-speed drive situation. Therefore, the realization of flexible adjustment of the excitation magnetic field has become a research focus in the field of permanent magnet motors. For this reason, the two excitation sources of excitation winding and permanent magnet are reasonably combined together to form a hybrid excitation synchronous motor with the exci...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems existing in the existing hybrid excitation motor, and to propose a new type of hybrid excitation direct drive motor, which has a simple and reliable structure, can improve the utilization rate of space, and can realize terminal voltage to remain unchanged by feeding a weak field excitation current. And constant torque operation under the condition of field weakening and speed up

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