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Power to a motor is cut at a point calculated to permit it to coast to a desired stop position regardless of the load being driven.
English (United States)
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Predictable Motor Stopping
Power to a motor is cut at a point calculated to permit it to coast to a desired
stop position regardless of the load being driven.
Gear motor backlash and load changes prevent repeatable, predictable
stopping of driven loads, especially where the load is variable. If power to the
motor is cut at the desired stop position, the motor will continue moving farther
depending upon the current load condition. If an earlier cutoff is chosen, the
motor may, nevertheless, stop before or after the desired stop position if the load
has changed. Gear backlash also contributes to unpredictable stopping
Here, the actual motor behavior, as determined by all the variables affecting
the behavior, is monitored at the time the motor is to be stopped, and the correct
point at which power must be cut off is calculated. The power is then cut off and
the motor allowed to coast, under load, to the desired stop position. A slit in a
disk mounted on the gear motor shaft indicates the desired stop position by
allowing a light beam to pass from a lamp to a detector positioned at 0 degrees .
Power is cut by removing a run signal from a gated driver circuit D1 at a motor
position calculated to permit the motor to coast to a stop with the slit aligned in
the light beam path.
Initially, the motor runs in either a forward or a reverse direction, depending
upon operator commands to gated driver circuit D2 or D3. For example, if a
forward operation is desired,...