Power tool and control method thereof

CN115967332BActive Publication Date: 2026-07-24NANJING CHERVON IND
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING CHERVON IND
Filing Date
2021-05-12
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing power tools lack flexible speed adjustment capabilities, which affects the flexibility of tool control and user experience.

Method used

By obtaining the demagnetization time after the motor winding commutation, the controller determines the motor load state based on the demagnetization time and outputs control signals with different duty cycles to adjust the motor speed.

Benefits of technology

It enables flexible control of motor speed, improves user experience, and reduces operating noise during no-load operation.

✦ Generated by Eureka AI based on patent content.

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    Figure CN115967332B_ABST
Patent Text Reader

Abstract

The application discloses an electric tool and a control method thereof. The tool comprises: a motor having a plurality of phase windings; a driving circuit having a plurality of semiconductor switching elements to switch the energization state of the windings of the motor; a power supply interface to access a power supply to power the motor; and a controller electrically connected to at least the motor or the driving circuit, wherein the controller is configured to: obtain the demagnetization time after the motor winding commutation; determine the load state of the motor according to the demagnetization time; output a first control signal with a first duty cycle to control the motor to operate when the motor is determined to be in an idle state according to the demagnetization time; and output a second control signal with a second duty cycle to control the motor to operate when the motor is determined to be in a load state according to the demagnetization time. The electric tool can flexibly adjust the motor speed.
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