Sensorlose Steuerung eines Bürstenlosen Motors mit Niedriger Geschwindigkeit in einem Elektrowerkzeug

Details

Veröffentlichungs-Nr.

EP4753139

Anmeldetag

20. April 2020

Veröffentlichung

3. Juni 2026

Rechtsraum

EP

IPC

H02P6/182

Abstract

A power tool is provided including a brushless motor having a stator defining a plurality of phases, a rotor rotatable relative to the stator, and a plurality of power terminals electrically connected to the plurality of phases; a power unit having a plurality of power switches connected electrically between a power source and the plurality of power terminals and operable to deliver power to the motor; and a control unit interfaced with the power unit to output a drive signal to one or more of the plurality of power switches to drive the plurality of phases of the motor over a plurality of sectors of the rotor rotation, the control unit being configured to detect an initial position of the rotor, commutate the motor beginning at the initial position of the rotor using a low-speed motor commutation scheme until an output speed of the rotor exceeds a speed threshold, and commutate the motor based on a back-electromotive force (back-EMF) voltage of the motor after the output speed of the rotor exceeds the speed threshold, wherein in the low-speed commutation scheme, the control unit applies a first plurality of voltage pulses to a present sector of the plurality of sectors and a second plurality of voltage pulses to a next sector of the plurality of sectors, and detects a transition of the rotor from the present sector to the next sector based on motor current measurements associated with the first plurality of voltage pulses and the second plurality of voltage pulses.

Anmelder

Firma

Black & Decker, Inc.

Land

🇺🇸 USA