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
Method and system for generating and displaying an interactive dynamic graph view of multiply connected objects
Motor drive component verification system and method
Linear book scanner
Magnetic disk and manufacturing method thereof
Optimization of packaging sizes
Sterilizable film for aseptic packaging
Query optimization with awareness of limited resource usage
  Randomly Featured Patents
Orthodontic bracket
Electric motor bearing system and journal
High gain lateral PNP and NPN bipolar transistor and process compatible with CMOS for making BiCMOS circuits
Apparatus for dispensing precise volumes of a liquid
Pet toy
Semiconductor memory device with program/erase verification
Ring
Method of (111) group II-VI epitaxial layer grown on (111) silicon substrate
Wireless remote tire parameter measurement method and apparatus
Multi-configuration sports/recreation facility