2 results about "Constant torque" patented technology

The invention discloses a soft startup testing method of torque-constant loading, which mainly solves the technical problems of the running safety and reliability of soft starting equipments, etc., and adopts the technical proposal which comprises the following testing steps: a device to be tested is connected; a loading device (a torque-constant loading device) is connected; an entire process from the zero-speed working condition to the working condition with the rated rotating speed of the device to be tested is selected, set up, started and tested, and related technical running parameters are recorded, thus finishing the testing. The soft startup testing method of the torque-constant loading is applicable to the tests of mechanical or electrical soft starting equipments of large-scale coal mine machineries.

The invention relates to the technical field of motors, and particularly discloses a permanent magnet motor rotor core and a motor. The permanent magnet motor rotor iron core comprises an iron core body and a plurality of magnetic steels, wherein the iron core body is provided with a plurality of magnetic pole units which are arranged at intervals along the circumferential direction of the iron core body; each magnetic pole unit comprises a V-shaped first magnetic steel groove, a V-shaped second magnetic steel groove and a U-shaped third magnetic steel groove, the first magnetic steel groove is arranged close to the outer edge of the iron core body, the third magnetic steel groove is arranged close to the center of the iron core body, and the second magnetic steel groove is arranged between the first magnetic steel groove and the second magnetic steel groove; and magnetic steel is arranged in each magnetic steel groove. According to the designed magnetic circuit, the magnetism gathering capacity of the motor can be improved, meanwhile, the salient pole ratio of the motor is increased, the reluctance torque of the motor is improved, then the torque density of a constant torque area and a weak magnetic area of the motor is effectively improved, and the air gap flux density waveform and the counter potential waveform can be improved. The magnetic circuit structure can flexibly arrange the position of the magnetic isolation bridge and effectively improve the limit rotating speed of the motor rotor.