December 2003
Intermediate to advanced
320 pages
9h 28m
English
Content preview from Analog Interfacing to Embedded Microprocessor Systems, 2nd Edition
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Tradeoffs between Motors
The tradeoffs between DC motors, brushless DC motors, and steppers are as
follows:
.
Stepper motors require no encoder and no feedback system to determine
motor position. The position of the shaft is determined by the controller, which
produces step pulses to the motor. However, this can also be a disadvantage. If
the load is too high, the stepper may stall and there is no feedback to report that
condition to the controller. A system using a DC motor with an encoder can tell
when this condition occurs.
.
Steppers have no brushes, so they produce less EMI.
.
A stepper can produce full torque at standstill, if the windings are energized. ...
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