The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 2018
Filed:
Oct. 11, 2016
Applicant:
Chervon (Hk) Limited, Wanchai, HK;
Inventors:
Assignee:
Chervon (HK) Limited, Wanchai, HK;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A01D 34/00 (2006.01); A01D 34/58 (2006.01); A01D 34/78 (2006.01); H02K 11/21 (2016.01); A01D 34/68 (2006.01); H02P 29/00 (2016.01); A01D 101/00 (2006.01);
U.S. Cl.
CPC ...
A01D 34/006 (2013.01); A01D 34/58 (2013.01); A01D 34/6806 (2013.01); A01D 34/78 (2013.01); H02K 11/21 (2016.01); H02P 29/00 (2013.01); A01D 2101/00 (2013.01);
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.