The invention discloses a direct-axis
magnetic field enhanced type wide-range speed control permanent
magnet brushless motor for an electric automobile. A
magnetic barrier fills each slot of a rotor, and the magnetic barriers are symmetrical relative to a centerline, i.e., a quadrature axis, of slot parts of the rotor; four sections of arc-shaped permanent
magnet steel are fixedly embedded on each
tooth part of the rotor, the four sections of arc-shaped permanent
magnet steel are divided into an inner layer and an outer layer, two sections are arranged on each layer, the two sections of permanent magnet steel on each layer are the same in structure and are symmetrical relative to a centerline, i.e., a direct axis of the tooth parts of the rotor, the two sections of permanent magnet steel on the same layer do not run through each other and are not connected with each other, and an arc-shaped magnetic bridge is formed between the two sections of permanent magnet steel; a circle center of each section of permanent magnet steel is located on the
diameter of the rotor; the direct-axis
inductance of the motor is larger than the quadrature-axis
inductance, so that the motor can adopt a control method with zero direct-axis current and can also adopt a direct-axis
magnetic field enhanced control method during low-speed operation or startup, and can adopt a coordinated control method of direct-axis
magnetic field enhancement and slight direct-axis magnetic
field weakening during high-speed operation, and the speed control range is wider.