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US 4,992,716 AGranted
Motor control with digital feedback
AssigneeKollmorgen Corporation
InventorGeorge H. Ellis
Life of this patent
Estimating the term…
Abstract
A motor feedback control system which in addition to a quantized digital position feedback value, uses a feedback signal which represents the error between the actual motor position and the quantized digital position. The error function is combined with the quantized digital position value to produce a digital position value with greater resolution. The combined value is differentiated to produce a velocity value for velocity feedback control of the motor.
Claims7
A digital feedback motor control system, comprising:
- microcontroller means for generating a digital command representing at least one motor parameter value;
- resolver means having a resolver to digital converter for providing a quantized digital value representing coarse motor position and a linear analog signal representing the difference between said coarse motor position and actual motor position;
- means for scaling and converting said linear analog signal into a fine digital value representing fine motor position.
- means for providing a digital feedback data representing the combination of said quantized digital value and said fine digital value;
- means for differencing said digital command with said digital feedback data;
- and
- means for converting data from said differencing means into excitation current for driving said motor.
4 more elements
A system for deriving parameter feedback data for electric motor control, comprising:
- a microcontroller for entering a digital command representing at least one motor parameter value;
- a resolver to measure motor position;
- a converter to convert said motor position to a coarse quantized data representing coarse motor position and a fine analog signal representing the linear difference between said coarse and actual motor position;
- an analog-to-digital converter to convert said fine analog signal to a fine digital data;
- an adder to combine said fine digital data with said coarse quantized data;
- whereby said combined data is used as feedback data to adjust said motor parameter.
3 more elements
Dependencies are inferred from the claim text.