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Precision virtual encoder

  • US 6,850,021 B1
  • Filed: 08/29/2003
  • Issued: 02/01/2005
  • Est. Priority Date: 08/29/2003
  • Status: Expired due to Term
First Claim
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1. A motor drive providing a torque signal to a motor, comprising:

  • a signal source outputting a desired motor speed signal; and

    a virtual encoder receiving the desired motor speed signal and producing a delta position signal based at least in part on the desired motor speed signal, wherein the virtual encoder outputs a desired position signal that differs from the delta motor position signal by an error that is maintained to a value less than a predetermined integer.

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