Permanent magnet motor

Abstract

The invention discloses a permanent magnet motor comprising a rotor. The rotor comprises a rotor core and permanent magnets. The rotor core comprises at least two accommodating slots, and the permanent magnets are respectively accommodated in the accommodating slots. Grooves are respectively arranged at two ends of the accommodating slots. Magnetic field of each permanent magnet does not penetrate through other permanent magnets. An angle, defined as alpha, is formed between the tail ends of the grooves disposed on two sides of the same accommodating slot and the center of the rotor. An angle, defined as delta, is formed between the tail ends of the adjacent grooves disposed on two different accommodating slots and the center of the rotor. Alpha is 80%-120% of delta. Other permanent magnets assisting the permanent magnets of the permanent magnet motor can be omitted. On the premise of guaranteeing electromagnetic torque of the permanent magnet motor, torque ripple is remarkably reduced. According to relation between alpha and delta, the electromagnetic torque of the permanent magnet motor is greatly increased.

Description

[0001] 【Technical field】 [0002] The invention relates to a motor, in particular to a permanent magnet motor. 【Background technique】 [0003] In the prior art, a permanent magnet motor includes a stator and a rotor. The rotor includes a rotor iron core and permanent magnets installed in the rotor iron core. The permanent magnets often use rare earth permanent magnets with high remanence magnetic properties as permanent magnet poles. [0004] See Patent No. CN102171909 and other related patents published on August 31, 2011. The number of permanent magnets in these rotors is four, which are respectively located on the four sides of the rotor iron core, forming the upper and lower ends of the rotor. The opposite pair of permanent magnets, the opposite pair of permanent magnets located at the left and right ends of the rotor, and the permanent magnets at the upper, lower, left and right ends are roughly surrounded by four permanent magnets to form a square structure. According...

AI Technical Summary

Problems solved by technology

[0005] How to reduce the cost of the motor on the basis of ensuring the original performance of the motor is an urgent problem to be solved by various companies. Since the cost of permanent magnets accounts for a large proportion of the total cost of the motor, many technical R&D personnel focus on permanent magnets. Considering the cost of the structure and size, but so far have not achieved a satisfactory result

Images