Electronically controlled motors
The main advantage with this type of machine is the absence of brushes. This means that they can give good performance in service life, low noise and low contamination (from brush dust).
Switched reluctance motors
The rotor is made of a laminated soft steel armature. Rotation is generated by the interaction of the rotor armature lobes and stator coils which are energised in sequence. A sophisticated electronic control ensures the current commutation. The absence of permanent magnets and rotor coils allows high performance levels in terms of absolute speed and efficiency. SRM can be used in many fields of application including washing machines, as servomotors in aerospace designs and in the automotive segment.
Controlled induction motorsTypically they do not use a rotor-speed sensor. The speed characteristic is controlled using predefined volts/Hz profiles and slip-compensation techniques. A good low noise level can be achieved with proper pulse width modulation techniques. CIM systems are used in clothes washers, compressors and blowers.
Brushless permanent magnets motorThe stator is similar to that of an induction motor. The rotor has permanent magnets mounted on a ferromagnetic core. A Hall sensor encoder or similar device is frequently used to sense rotor position. The motors are used in refrigeration compressors, washing machines, fans and blowers.
Sensor-bearing units for small electric motors
SKF Sensor Bearing Units multi-sensing functions in addition to the normal bearing operation
SKF hybrid bearings for high speed electric motors
SKF has selected a range of grease-lubricated single row deep groove ball bearings with ceramic balls
Single row deep groove ball bearings in advanced drive systems
SKF can offer bearings to meet the high performance requirements of advanced drive systems