Physical Properties of Small DC Motors Using an lronless Rotor

In modern technical developments of all kinds, we find an increasing number of

servo systems where motors are either a sensor or an actuator. For these applications DC motors with an ironless armature and permanent magnet are particularly well suited, due to their unique linear characteristics. Low armature inertia and very low starting voltages are additional decisive advantages with this kind of construction.

Since the introduction of the Escap® motor in 1960, we have the time and again been asked questions concerning the physical properties of this motor. Therefore, we thought it useful to give a brief, yet thorough, explanation of these properties. The simple mathematical relations have been illustrated by some practical calculations.

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