Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2007-05-03
2009-10-20
Duda, Rina I (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S811000, C318S599000
Reexamination Certificate
active
07605556
ABSTRACT:
A method of controlling a motor speed for a fan assembly includes receiving a duty cycle value at a microcontroller. The microcontroller receives a measured fan speed from a speed sensor. An expected fan speed is determined, where the expected fan speed corresponds to the duty cycle value. The measured fan speed is compared with the expected fan speed. A duty cycle of a motor driving signal is reduced if the measured fan speed is less than a predetermined fraction of the expected fan speed.
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Frankel Scott
Hardt Eric
Strike Nigel D.
Duda Rina I
Minebea Co. Ltd.
Townsend and Townsend / and Crew LLP
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