Patent · US Active

Power tool and control method thereof

US9936634B2 · kind B2 · utility

1Cited by

5References

11Claims

0Family size

Assignee

Chervon (HK) Limited · CN

Inventors

Dezhong Yang · Nanjing, CN
Chao Xian · Nanjing, CN
Haiyan Li · Longbeilingcun, CN

Key dates

Filing date	Oct 11, 2016
Grant date	Apr 10, 2018
Priority date	—
Expiry date	Oct 11, 2036

Classification

Technology area (CPC A)Human Necessities
CPC primaryA01D2101/00
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A power tool includes an electric motor, a functional accessory capable of being driven by the electric motor, a detection device for detecting a rotational speed of the electric motor, and a controller for controlling the electric motor with a control signal. The control is operable to estimate a load parameter according to a duty cycle of the control signal and the rotational speed of the electric motor such that the electric motor is caused to be operated by the controller with a lower rotational speed under a lower load and a higher rotational speed under a higher load.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.