US 7,321,213 B2
Motor controller
Shigeru Kobayashi, Toyohashi (Japan); Seiichi Watanabe, Nishikamo-gun (Japan); and Seiichi Tanaka, Toyota (Japan)
Assigned to ASMO Co., Ltd., Shizuoka (Japan)
Filed on Jul. 11, 2006, as Appl. No. 11/483,683.
Claims priority of application No. 2005-210455 (JP), filed on Jul. 20, 2005.
Prior Publication US 2007/0035896 A1, Feb. 15, 2007
Int. Cl. H02P 1/04 (2006.01)
U.S. Cl. 318—471  [318/470; 388/800; 388/831; 361/25; 361/33; 713/320; 714/51; 714/55] 7 Claims
OG exemplary drawing
 
1. A motor controller comprising:
an estimated temperature calculating means that calculates an estimated temperature of a motor; and
a control unit that can perform a driving control of the motor only when the estimated temperature is not larger than a predetermined value,
the motor controller further comprising:
a mode switching means that switches the control unit and the estimated temperature calculating means between in a normal operation mode in which the control unit and the estimated temperature calculating means can drive the motor and in a sleep mode in which electric power consumption of the control unit and the estimated temperature calculating means is smaller than in the normal operation mode in accordance with a predetermined condition while the motor is stationary; and
an activating means that activates the estimated temperature calculating means in the sleep mode for a predetermined active time every time a predetermined sleep time is elapsed.