Hybrid excitation Motor

Abstract

The present invention discloses a hybrid excitation motor. The comprises a stator and a rotor which are coaxially sleeved with each other; grooves are formed in the inner wall of the stator which sleeves the rotor or the rotor which sleeves the stator along the circumferential direction of the inner wall; grooves are formed in the outer surface of the rotor which is sleeved with the stator or the stator which is sleeved with the rotor; a direct-current excitation winding and an alternating-current armature winding are arranged in the stator grooves; each stator tooth is provided with protrusions which protrude out from the corresponding groove and are located at side surfaces of two sides of the groove; each protrusion is provided with a permanent magnet; the polarities of the two permanent magnets arranged at the two side surfaces of each stator tooth are the same; and the polarities of the permanent magnets of two adjacent teeth are opposite. When the motor of the invention operates at a low speed, current in the direct-current winding is positive, a total excitation magnetic field can be enhanced, and the overload capacity of the motor can be improved; and when the motor operates at a high speed, the current in the direct-current winding is negative, the total magnetic field can be weakened, and the flux weakening ability of the motor can be improved. The excitation motor of the invention has the advantages of low risk of irreversible demagnetization of the permanent magnets, small magnetic resistance of excitation magnetic fields, strong flux adjustment ability of the excitation windings and reliable and stable operation. According to the motor of the invention, slip rings and electric brushes are not needed, and therefore, problems such as the problem of sparks can be avoided.

Description

technical field [0001] The invention belongs to the field of motors, and in particular relates to a hybrid excitation motor. [0002] technical background [0003] The permanent magnet synchronous motor utilizes the characteristics of high magnetic energy product of permanent magnets, so it has the advantages of high power density and high efficiency. However, since the flux linkage generated by the permanent magnet is basically not adjustable, the weak field speed regulation ability of the permanent magnet motor is weak. The excitation current of the electric excitation synchronous motor can be adjusted flexibly, so its field weakening ability is strong, but because the excitation winding and the rotor rotate synchronously, slip rings and brushes are required, sparks may be generated, and the reliability is greatly reduced; at the same time, the excitation winding will generate Copper loss, motor efficiency is not high. In order to combine the advantages of permanent magne...

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Problems solved by technology

[0005] However, since the excitation windings in the parallel hybrid excitation motor are all on the rotor, slip rings and brushes are required to feed DC current to the excitation windings, which will inevitably bring about problems such as electric sparks, which will reduce the reliability of the motor operation and require maintenance work. Increase

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