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:
Dec. 29, 2020
Filed:
Jun. 12, 2017
Igarashi Electric Works Ltd., Kawasaki, JP;
Junichi Tada, Kawasaki, JP;
IGARASHI ELECTRIC WORKS LTD., Kawasaki, JP;
Abstract
A control device for a brushless DC servo motor which uses a MR sensor unit and controls the motor with high precision by a closed loop. The motor control device comprises a control unit for controlling power supplied to three pairs of stator coils of U, V and W phases. The control unit generates phase information for each of the U, V and W phases and obtains an absolute origin position of the rotary shaft with respect to the driving signal, when the brushless DC servo motor is driven, based on the synchronization relationship of: a driving signal rising phase from zero; an integrated value peak phase of counter electromotive force to the phase stator coil obtained by driving the motor; and a rising phase of the output signal of the A phase or the B phase output from the MR sensor unit corresponding to zero of the driving signal.