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:
Oct. 15, 2019
Filed:
Jun. 28, 2018
Nidec Servo Corporation, Kiryu-shi, Gunma, JP;
Masatomo Ishikawa, Kiryu, JP;
NIDEC SERVO CORPORATION, Gunma, JP;
Abstract
A motor drive apparatus for driving a motor includes a rectifier, a capacitor, an inverter circuit, a control portion arranged to output a drive signal, and a sensing portion arranged to sense a smoothed direct-current voltage, and output an analog sensing result to the control portion. After outputting a drive signal to drive the motor, the control portion quantizes the sensing result using a predetermined number of bits at a predetermined interval for a period longer than a power-supply period of an alternating-current power supply, determines Vwhich satisfies both V>Vand V>Vto be a peak value when Vdenotes an nth voltage value obtained by quantizing the sensing result, determines whether the peak value is within a predetermined range, and outputs a drive signal to stop the motor if the peak value is outside of the predetermined range.