Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Apparatus and method for controlling the rotational speed of a motor










Image Number 2 for United States Patent #5301131.

An apparatus for controlling the rotational speed of a motor. The apparatus comprises a subtracter for subtrating a speed error signal corresponding to a frequency signal generated from a frequency generator from a period deviation signal between the frequency signal and a predetermined reference frequency signal to produce a primarily compensated speed error signal; a first adder for adding the primarily compensated signal and the period deviation signal to produce an added signal; a delay circuit for delaying the output signal of the first adder, wherein the delay circuit comprises a first to an Nth delay cells, wherein each of the delay cells latches the output signal of the first adder entering the first delay cell and serially shifts the latched signal in each of the delay cells toward the Nth delay cell by one signal at a time whenever the output of the first adder is supplied to the delay circuit and wherein the output of the delay circuit is supplied to the subtracter and to the first adder; a summation circuit for summing up all of the signals being shifted from the respective delay cells to produce a sum period deviation signal; an averaging circuit for averaging the sum period deviation signal to produce an averaged deviation signal; and second adder for adding the primarily compensated signal and the averaged deviation signal to produce the motor speed control signal with a compensated period deviation. A method is also provided for controlling the speed of the motor.








 
 
  Recently Added Patents
Image capture and identification system and process
System and method for enabling image recognition and searching of remote content on display
Method and system for imaging a cross section of a specimen
Reliable event broadcaster with multiplexing and bandwidth control functions
Virtual physician acute myocardial infarction detection system and method
System, method and computer program product for sharing a single instance of a database stored using a tenant of a multi-tenant on-demand database system
Cosmetic or pharmaceutical peptides containing uncoded amino acids and their use in the treatment and/or care of the skin, mucous membranes, or scalp
  Randomly Featured Patents
Vehicle brush guard
Fixing structure and electronic device using the same
Shade operator with release brake
Earphone
Wagon
Hydrogel oxygen generator with improved fluid flow
Process for maximizing the growth and nicotine degrading activity of microorganisms
Viscous fluid type heat generators
Method for optimizing the display of flat slices of a cyclically and complexly moving examination object from detector measured data of a tomography unit
Moisture resistant splice assembly