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:
Nov. 17, 1998
Filed:
Jun. 11, 1997
Hiroshi Yamaguchi, Nagoya, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Abstract
An apparatus is provided for controlling temperature of a motor by estimation. The temperature apparatus includes an initial setting circuit for setting an initial value of a temperature representative variable .theta., a temperature rise estimating circuit for calculating .theta.+A (where A is an incremental parameter reflecting a temperature rise under driving of the motor) for renewal of .theta. when the motor is driven, a temperature drop estimating circuit for calculating .theta.-.theta./S (where S is decremental parameter reflecting a temperature drop by heat dissipation of the motor) for renewal of .theta. periodically at a predetermined time interval while the temperature control apparatus is operating, and a power supply prevention circuit for preventing power supply to the motor when .theta. becomes no less than .theta.max (which is an upper limit parameter reflecting an upper tolerable limit temperature of the motor) and until .theta. becomes lower than .theta.max.