Motor Speed Control Cards
Instech’s motor control circuit cards regulate the speed of small
DC permanent-magnet brush motors, such as those used in our miniature
peristaltic pumps. Two cards covers a range of motors up to 24V at 0.2A.
These small boards are easy to integrate into a larger system; in the
simplest configuration they require only an external potentiometer for
speed control, a single power supply, and a motor.
- Precise bi-directional speed control - Without a
speed controller, your motor may slow significantly when a load is placed
on it during operation (see chart below). With a speed controller, you
set the motor speed with a control voltage, and it holds that speed
constant over a wide range of torque. The speed control will also cause
your motor to start predictably at low speeds.
- Pseudo-tachometer feedback circuit - All of Instech’s
control cards feature a fast feedback circuit which extracts the back
EMF of the motor to regulate its speed. The circuit does not require
a tachometer or encoder; it uses only two motor wires.
- Active braking - Setting the control voltage to zero
will cause the controller to drive the motor in the opposite direction,
bringing it to a stop much faster than if the power were simply turned
off. It will also actively prevent the motor from turning once it has
- All analog design for low EMI.
Instech's motor control circuitry works only with permanent-magnet DC
The prices below apply to quantites of 1-4 pieces. For pricing at higher
quantities, please contact Instech.
||Control card for PMDC motors, 50 mA
||$107 / each
||Control card for PMDC motors, 200 mA
||$148 / each
motor control cards information [PDF]
Instech Laboratories, Inc. ©