The first two models in the MR range have output torques of 3 and 15Nm respectively. DC motors of either 12 or 24V provide output speeds from 60 to 500rpm depending on the model and the ratio of the worm gearbox. A two channel encoder built into the motor gives positioning or speed feedback at either 1 or 4 pulses per revolution. Depending on the gear ratio, this corresponds to between 12 and 276 pulses per revolution of the output shaft.
The third model also has a rated torque of 15Nm, but instead of the encoder it has two –built-in stroke limit switches that can be set in a range from 20 to 140 revolutions of the output shaft. In addition there is a 5kOhm rotary potentiometer for position feedback.
The MR geared rotary actuators are manufactured by linear actuator specialist Linear-Mech and are available in the UK through Lenze's Techdrives division.