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 system for fail-safe call survival
Authentication platform and related method of operation
Method for conductivity control of (Al,In,Ga,B)N
Permitting access of slave device from master device based on process ID's
Thermoplastic fluoropolymer composition
Adaptive frame scanning scheme for pulsed X-ray imaging
EpCAM as a reprogramming factor for non-pluripotent cells
  Randomly Featured Patents
Interlaced binary shape coding method and apparatus
Surface inspection using the ratio of intensities of s- and p-polarized light components of a laser beam reflected a rough surface
Connecting electrical bus bars to electrical circuitry
Armored tire
User interface having analysis status indicators
Removable weather guard for headwear
Reduced-pressure medical systems and methods employing a moisture processing device
Synapse circuit which utilizes ballistic electron beams in two-dimensional electron gas
Low expansion corrosion resistant ceramic foam filters for molten aluminum filtration
Silicon-on-insulator (SOI) chip having an active layer of non-uniform thickness