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
Method and apparatus for information exchange over a web based environment
Downhole telemetry system
Article based on a composition containing a crosslinked blend of elastomers
Method for producing purified influenza virus antigen
Monitoring and correcting upstream packet loss
State control of remote hosts for management of distributed applications
Functional component compensation reconfiguration system and method
  Randomly Featured Patents
Rotary selector switch
Electrical mud box
4'-Methyl-.beta.-mercapto-.beta.,.beta.-cyclopentamethylenepropionic acid vasopressin antagonists
Combined warning light and safety sign for long loads
A.C. and D.C. voltage polarity indicator utilizing electrochromic cells
Synthesis of chloroacetyl and bromoacetyl modified peptides for the preparation of synthetic peptide polymers, conjugated peptides, and cyclic peptides
Explosion proof battery
Pinch valve
Process for producing optically active 3-halogenocarboxylic acid ester and 3-azidocarboxylic acid ester
Glass fiber evaporative cooler media, method of forming same, use thereof in an evaporative cooling method, and an evaporative cooler apparatus utilizing glass fiber cooling media