1. Method and device for controlling electronically commutated electric machines

2. Method for operating an electronically commutated motor, and motor for carrying out one such method

3. A Brushed DC electric motor is an internally commutated electric motor designed to be run from a direct current power source

4. In the device, an electric motor takes the form of a brushless, electronically commutated disc armature motor (201) with permanent magnets arranged on the rotor and air-core windings (202) on the stator.

5. A spindle motor control circuit (20) for controlling the acceleration and position locking of a spindle motor (22) includes a first mode of operation whereby the spindle motor (22) is commutated through use of an external clock (32, 34).