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A decimal counter loaded with position and phase information is utilized to determine the difference between electrical and mechanical positions of a stepper motor.
English (United States)
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Electrical Lead Angle Monitor
A decimal counter loaded with position and phase information is utilized to
determine the difference between electrical and mechanical positions of a
Attached to the stepper motor shaft is a position encoder for outputting n
pieces of position (P) information for each step of the motor. A switch (SW)
pulse, input to the motor for changing phases, changes the electrical position by
an mth of a step. In the majority of cases m will be equal to either 1 or 1/2.
nmSigmaSW-SigmaP is an exact representation of the electrical and mechanical
position difference, or electrical lead angle, at the time a piece of position
information is output from the encoder. This representation is obtained from a
counter which is incremented on switch pulses and decremented on position
pulses. A scaling of nm can be accomplished in two ways. One way is by
incrementing the counter nm times for each switch pulse at the same decimal
place that position information causes a decrementing of the counter. The other
way is to divide the position pulses by nm. A position prescaler can be appended
to the input of the counter to provide the least significant bits of the counter.
For monitoring purposes, the counter is usually sampled once per step at the
switch pulse time.