The main advantage with this type of machine is the absence of brushes. This means that they can give good performance in service life with 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 energized 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 applications including washing machines, as servomotors in aerospace designs and in the automotive segment.

Controlled induction motors
Typically they do not use a rotor-speed sensor. The speed characteristic is controlled by using predefined volts/Hz profiles and slip-compensation techniques. A good low noise level can be achieved with proper pulse width modulation techniques.

Brushless permanent magnets motors
The 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.

HCH bearings for advanced drive systems
HCH can offer bearings to meet the high performance requirements of advanced drive systems.

The absence of brush dust contamination enables the use of metal shields as a capping solution. The internal radial clearance is selected to meet the requirements of high speed and low noise. Bearings are usually lubricated for life with grease that has low noise properties. To achieve the required service life, special attention needs to be focused on the grease specified and the grease fill used. A plastic cage can be chosen to increase the speed rating. If necessary, bearing component tolerances and internal geometry can be developed to meet specific application requirements.

Please contact HCH application engineers to determine the appropriate bearing arrangement for your motor design.