Constant power and double speed control system and control method based on direct current brushless electric tool

Abstract

The invention discloses a constant power and double speed control system and a constant power and double speed control method based on a direct current brushless electric tool. The constant power and double speed control system based on the direct current brushless electric tool comprises a two gear rotation speed switching module, a constant power and double speed control module, a motor output power control module and an electrical inductance device, wherein the electrical inductance device collects supply voltage, work current and motor speed information in running of a motor, the two gear rotation speed switching module provides different rotation speed choices, the constant power and double speed control module reads and judges information sent by the two gear rotation speed switching module and the electrical inductance device, and the motor output power control module regulates output power of the motor according to the judged information of the constant power and double speed control module. By adopting the above mode, the constant power and double speed control system and the constant power and double speed control method based on the direct current brushless electric tool not only can adapt to a load well, but also save energy, and simultaneously effectively guarantee that output power of a matched battery system is in a normal range so as to achieve protection for the battery system.

Description

technical field [0001] The invention relates to the field of DC brushless motor drive systems, in particular to a constant power and double-speed control system and control method based on DC brushless electric tools. Background technique [0002] For the traditional brushless DC motor drive system in the field of electric tools powered by lithium battery packs and garden tools, there are great defects. When traditional brushless DC electric tools and garden tools are in use, when the motor speed is under open-loop control, When the system load is low, the motor still outputs full power. Working in this state for a long time will cause waste of electric energy. When encountering a high load, because the constant power technology is not used, the output current of the motor will increase rapidly, causing the motor to heat up. , and will cause damage to the performance of the corresponding supporting lithium battery, thereby greatly reducing the service life of the motor and b...

AI Technical Summary

Problems solved by technology

[0002] For the traditional brushless DC motor drive system in the field of electric tools powered by lithium battery packs and garden tools, there are great defects. When traditional brushless DC electric tools and garden tools are in use, when the motor speed is under open-loop control, When the system load is low, the motor still outputs full power. Working in this state for a long time will cause waste of electric energy. When encountering a high load, because the constant power technology is not used, the output current of the motor will increase rapidly, causing the motor to heat up. , and will cause damage to the performance of the corresponding supporting lithium battery, thereby greatly reducing the service life of the motor and battery, so people need a control system that meets the needs more

Images