Appeal No. 1996-2199
Application 08/191,060
23, 24 and 26-29, which constitute all the claims remaining in
the application. An amendment after final rejection was filed
on April 20, 1995 and was entered by the examiner.
The disclosed invention pertains to a controller
circuit incorporated into the same substrate as a driver
circuit for a polyphase DC motor such as that used in modern
computer disk drives. A temperature sensor monitors the
temperature of the substrate. The controller adjusts the
speed of the motor based on the temperature of the substrate
using a hysteresis relationship between the measured
temperature and the speed of the motor.
Representative claim 1 is reproduced as follows:
1. An integrated circuit fabricated on a semiconductor
substrate for providing drive signals to a polyphase dc motor,
comprising:
a driver for sequentially supplying drive currents to
drive coils of the motor;
a commutation controller for commutatively selecting, at
first and second frequencies, the drive coils to which the
drive currents are sequentially supplied by the driver, said
first frequency being higher than said second frequency;
a temperature sensing element fabricated in said
substrate to indicate the temperature of said substrate;
2
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