Motor rotor and permanent magnet synchronous motor

Abstract

The invention provides a motor rotor and a permanent magnet synchronous motor. The motor rotor comprises a rotor iron core (1), rotor teeth (2) and rotor grooves (3) are alternately arranged on the rotor iron core (1) along the circumferential direction, permanent magnets (4) are arranged in the rotor grooves (3), the permanent magnets (4) are magnetized in the tangential direction, first magnetic isolation grooves (5) are arranged on the radial inner sides of the rotor grooves (3), a second magnetic isolation groove (6) is arranged on the rotor iron core (1) between every two adjacent first magnetic isolation grooves (5), magnetic bridges (13) are formed between the second magnetic isolation grooves (6) and the first magnetic isolation grooves (5) on the two sides, and the first magnetic isolation grooves (5) are in an arc shape. According to the motor rotor, the magnetic leakage of the rotor grooves close to the rotating shaft side can be effectively reduced, and the output torque of the motor is improved.

Description

technical field [0001] The present application relates to the field of motor technology, in particular to a motor rotor and a permanent magnet synchronous motor. Background technique [0002] At present, in the industry and home appliance industry, there are a large number of applications that pursue low speed and high torque. For low-speed high-torque motors, when the permanent magnets are radially placed and tangentially magnetized, the motor can generate higher air-gap flux density due to its good magnetization effect on the rotor, and can make full use of the AC / D axis asymmetry to generate The reluctance torque increases the torque density and achieves superior performance. [0003] The above-mentioned types of motors usually achieve the purpose of outputting high torque at low speed by increasing the volume or the number of poles. However, due to the large number of poles, the outer diameter of the rotor needs to be increased to ensure the installation space. At this ...

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Problems solved by technology

[0003] The above-mentioned types of motors usually achieve the purpose of outputting high torque at low speed by increasing the volume or the number of poles. However, due to the large number of poles, the outer diameter of the rotor needs to be increased to ensure the installation space. At this time, the magnetic flux leakage on the side of the rotor slot near the shaft is very serious. Directly affect the size of the output torque

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