BRUSHLESS MOTOR AND CONTROL METHOD THEREOF

摘要

A brushless motor includes a rotor, a plurality of sets of stator windings, a position detection assembly, a MOSFET assembly, an inductance detection module and a main control module that controls them. The position detection assembly has a plurality of detection elements for detecting a position of the rotor and a position detection module for receiving signals fed back from the detection elements with the position detection module being electrically connected to the main control module and feeding back the positional information of the rotor thereto. The main control module alternatively switches between the position detection assembly and the inductance detection module to detect the position of the rotor. When the motor runs at a low speed, the system may effectively judge the position of the rotor to enable the machine to start with a load and, when the motor runs at a high speed, the system may accurately judge the position of the rotor, correctly drive the motor to run, eliminate errors caused by assembly, and prolong the service life of the motor.

主权项

1. A brushless motor, comprising:
a rotor and a plurality of sets of stator windings; a position detection assembly; a MOSFET assembly; an inductance detection module; and a main control module for controlling the position detection assembly, the MOSFET assembly and the inductance detection module; wherein the position detection assembly comprises a plurality of detection elements for detecting a position of the rotor and a position detection module for receiving signals fed back from the detection elements and the position detection module is electrically connected to the main control module and feeds back the position information of the rotor thereto; wherein the MOSFET assembly comprises a MOSFET module for controlling the stator windings to achieve a current switch, and a MOSFET drive module for driving the MOSFET module, the MOSFET module is electrically connected to the stator windings, and the MOSFET drive module is electrically connected to the main control module and the MOSFET module respectively; wherein the inductance detection module is electrically connected to the stator windings and detects the current of the stator windings; and wherein the main control module alternatively switches between the position detection assembly and the inductance detection module to detect the position of the rotor and, when a rotational speed of the rotor is smaller than a switch rotational speed, the main control module controls the position detection assembly to detect the position of the rotor and to control the current switch of the stator windings according to the feedback of the position detection module and, when the rotational speed of the rotor is greater than or equal to the switch rotational speed, the main control module switches to the inductance detection module to detect the position of the rotor and to control the current switch of the stator windings according to the feedback of the inductance detection module.