DC motor phase estimation with phase-locked loop

Details DC motor phase estimation with phase-locked loop DC motor phase estimation with phase-locked loop

2008-07-08

2008-07-08

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Positional servo systems

Adaptive or optimizing systems including 'bang-bang' servos

C318S567000, C318S608000, C318S636000, C318S652000, C700S028000

Reexamination Certificate

active

07397212

ABSTRACT:
A DC motor phase estimation algorithm that estimates a speed-related harmonic frequency of a DC motor current under dynamic load conditions having known geometry parameters. The algorithm estimates the phase and magnitude of a complex coefficient in a complex single frequency adaptive filter that receives a primary signal from the motor current and estimates a reference signal using an incident frequency by adapting the complex coefficient to match the magnitude and phase of the speed-related harmonic component of the primary signal. The rate of change of the phase of the complex coefficient is determined by a phase-lock loop coupled to the adaptive filter to adapt a dynamic incident frequency corresponding to a single frequency component of interest in the primary signal. The incident frequency is extracted, and the motor speed is estimated using the extracted incident frequency and the known motor geometry parameters.

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