1PM4 motor (SH 100 and SH 132, liquid-cooled)
The liquid-cooled 1PM4 motors have been specially designed for direct mounting on mechanical spindles. The hollow shaft permits the passage of coolant for tools with internal cooling. The shaft is prepared on the non-drive end of the motor for connection of a turning bushing for input of the coolant.
Given the compact design of modern machines, the heat loss from electrical drives can have an adverse effect on the accuracy of machining. The resulting demand for cold motors with a high power density led to the development of the 1PM4 liquid cooled motors.
Furthermore, a combination of high torque and small construction volume (low moment of inertia) results in short acceleration and braking times, and thus in a reduction in non-productive time.
The motors have a built-in hollow-shaft measuring system for recording the motor speed and indirect position.