The invention belongs to the technical field of motors, and provides a brushless motor and a motor rotor position detection method A first linear Hall sensor and a second linear Hall sensor are respectively arranged at the positions with the electrical angle difference of 90 degrees; a third linear Hall sensor is arranged at an electrical angle position which is different from the first linear Hall sensor by n * 360 degrees + 180 degrees; a fourth linear Hall sensor is arranged at an electrical angle position which differs from the second linear Hall sensor by n * 360 degrees + 180 degrees, so that rotor position information is obtained according to Hall voltage signals output by the linear Hall sensor, and the problems that an existing rotor position detection device is complex in structure and large in installation difficulty are solved

Brushless motor and motor rotor position detection method

A motor driving device includes a PWM signal generating unit, a control unit, a driving unit, a floating point selecting unit and a BEMF detecting unit. The PWM signal generating unit generates an input PWM signal having a duty cycle according to a rotation speed command. The control unit generates a driving signal having multiple phases and an output PWM signal. The floating point selection unit selects a floating phase of the motor that is not turned off, and the BEMF detecting unit receives detects the BEMF of the floating phase during ON times or OFF times of the output PWM signal, so as to output a commutation signal in response to zero crossing events occurring in the BEMF. The control unit controls the BEMF detecting unit to detect the BEMF of the floating phase under the ON times or the OFF times of the output PWM signal.

Motor driving device and method

The embodiment of the invention discloses a motor control device and method. The motor control device comprises a driving circuit for obtaining a three-phase output voltage according to an input voltage command and a stator angle to drive a motor; and an adjusting circuit for obtaining an advance angle according to a phase current signal flowing through the motor and a back EMF angle, and adjusting a stator angle according to the advance angle so that the phase current signal and the back EMF signal can automatically achieve in-phase change, thereby achieving the advance angle control in a wide working range.

Motor control device and method

The rotor position detection device comprises a permanent magnet, a rotor iron core and a stator iron core which form the permanent magnet motor, the permanent magnet is located between the rotor ironcore and the stator iron core, and the permanent magnet is connected with the rotor iron core; the PCB is fixed on the stator iron core; the Hall position sensor is fixed on the PCB and faces the permanent magnet, and a certain space is reserved between the Hall position sensor and the permanent magnet; wherein the Hall position sensors comprise the first Hall position sensor and the second Hallposition sensor, and the electrical angle between the axis of the first Hall position sensor and the axis of the second Hall position sensor is 90 degrees. According to the utility model, the two Hallposition sensors with a 90-degree electrical angle difference are adopted to obtain Hall position signals, so that one Hall position sensor and peripheral devices are reduced, and the hardware complexity and cost are reduced; due to the reduction of devices, the power consumption of the circuit is reduced.

Rotor position detection device of permanent magnet motor

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Motor control device and method

Rotor position detection device of permanent magnet motor