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. 07, 1987
Filed:
Feb. 10, 1986
Takayoshi Nishikawa, Chiryu, JP;
Nippondenso Co., Ltd., Kariys, JP;
Abstract
In the present invention, in an electric motor control apparatus wherein a load current modulated in a pulse form and flowing in an electric motor is detected, and the load current is controlled by varying a pulse width of the load current so that an average value of the load current follows a command value, the electric control apparatus includes switching means for modulating a direct current supplied to the electric motor from a DC power supply to form the load current, a current detector for detecting the load current flowing in the electric motor, an average load current detecting means for detecting the average value of the load current by inputting from the current detector a load current at a time point after the switching means is rendered conductive and after the lapse of a predetermined time which varies in accordance with an 'on' time of the switching means, and by assuming the inputted load current as the average value of the load current to be detected, an 'on' time calculating means for determining the 'on' time of the switching means in the next period based on the average value of the load current detected by the average load current detecting means and the command value, and a switching control section for on-off controlling the switching means in accordance with a commanded period and the 'on' time calculated by the 'on' time calculating means.