Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Preventing error in an access protocol
Image tagging based upon cross domain context
Movable hinge
Rapid detection method for decay of liquid crystal display device having LED backlight and display device provided with rapid compensating device for decay
Real estate environmental sustainability index
Fixing structures for intake manifolds
Real-time balance updates
  Randomly Featured Patents
Alkaline barium alcoholates
Converted wood articles, composite wood products made therefrom and method of making same
Method of making benzoyl halides and nitriles
Ribonucleoside-derivative and method for preparing the same
High-sensitivity magnetic field sensor
1-(P-Alkanoylphenyl) alkanols and derivatives
Synergistic insecticidal formulations of pyridaben and strobilurins
Catalyst composition and processes therefor and therewith
DNA encoding canine immunoglobulin A
Cyclic depsipeptide PF 1022G