Invention Grant
US08624532B2 System and method for synchronizing sinusoidal drive to permanent magnet motor without distorting drive voltage 有权
将正弦驱动与永磁电机同步而不会使驱动电压发生变形的系统和方法

  • Patent Title: System and method for synchronizing sinusoidal drive to permanent magnet motor without distorting drive voltage
  • Patent Title (中): 将正弦驱动与永磁电机同步而不会使驱动电压发生变形的系统和方法
  • Application No.: US13199126
    Application Date: 2011-08-19
  • Publication No.: US08624532B2
    Publication Date: 2014-01-07
  • Inventor: Yew Tat ChuahYisong Lu
  • Applicant: Yew Tat ChuahYisong Lu
  • Applicant Address: US TX Dallas
  • Assignee: Texas Instruments Incorporated
  • Current Assignee: Texas Instruments Incorporated
  • Current Assignee Address: US TX Dallas
  • Agent Alan A. R. Cooper; W. James Brady, III; Frederick J. Telecky, Jr.
  • Main IPC: H02P6/18
  • IPC: H02P6/18
System and method for synchronizing sinusoidal drive to permanent magnet motor without distorting drive voltage
Abstract:
A system for controlling a motor (3) includes a driver circuit (5) for generating a drive voltage (v) to generate a phase current (i) in the motor. Phase current sensing circuitry (10,21) digitizes the phase current. A first circuit (23) provides a reconstructed digital representation of a BEMF signal (vbemf) of the motor to generate an error-corrected synchronization signal (SYNC) in response to the phase current and a detected error in the motor speed, an amplitude feedback signal (15), and information (iR,iL,ΔiL,vL) indicative of a resistance (Rm) and an inductance (Lm) of the motor. A motor drive signal (15) having an error-corrected frequency is generated in response to the synchronization signal. A PWM circuit (16) produces a PWM signal (17) having a frequency equal to the error-corrected frequency of the synchronization signal (SYNC) and a duty cycle controlled according to the detected error.
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