Resources Contact Us Home
Motor speed control device

Image Number 12 for United States Patent #6031966.

The motor speed control device of the present invention is provided with an FG sensor and a waveform shaping circuit for obtaining N pulse signals (N.gtoreq.1 where N is an integer) in one rotation of a motor so as to control the rotation speed of the motor in accordance with period information of the FG pulse signal outputted from the waveform shaping circuit. The motor speed control device is further provided with an FG nonuniformity correcting circuit for correcting, by using respective period information of a rising edge-falling edge period and a falling edge-rising edge period, periodic nonuniformity of each period. The motor speed control device controls the motor in response to an actual speed error signal whose nonuniformity such as a duty error and a phase error has been corrected by the FG nonuniformity correcting circuit. The described arrangement permits to provide a motor speed control device having a wide control band and a large servo gain capable of accurately controlling the rotation speed of the motor.

  Recently Added Patents
Display screen with graphical user interface
Direct mode adapter based shortcut for FCoE data transfer
Virtual billboards
Electrifying roller
Method and system for providing an intelligent visual scrollbar position indicator
Method and apparatus for communication
Laser marking of a card
  Randomly Featured Patents
Polyester false-twist yarn and method of manufacturing the yarn
Container restraining device
Golf club caddy
Corner bracket
Telescopic illuminating tool
Programming a phase-change material memory
Compression unit for oscillating roll
Selective gain adjustment to aid carrier acquisition in a high definition television receiver
Medical sling procedures and anchor insertion methods and devices
Fuel delivery control for internal combustion engine