Founded in 1995, China Dongda Power Industry Co., Ltd. is one of the few switched reluctance motor manufacturer and distributor in China that has patents on the generator, motor, power supply, engine, alternator, diesel and gearmotor design, supply and sale. Our custom switched reluctance motors has obtained the certifications of ISO9001-2000, GS/TUV, CE, VL, EPA, QHS, SON, CAP and SRS and we have won EPA 2005 Motor Year Certification. Our 30 QC staff carefully performs inspections at every stage of production, from the time we receive raw materials to packaging. Noise, power, and stability are tested to ensure that our engines can endure 580 hours of constant use. We also can design and deliver OEM/ODM samples in one month.

This is the company's first use of a switched reluctance motor in an appliance design. Switched reluctance motors are simple and rugged, but require sophisticated controls to knock down noise levels and to smooth torque perturbations. Dyson relied on the expertise of its acoustics engineers and anechoic chamber testing to monitor the pitch of the design. Victrex, based in Greenville, S.C., also supplies material for the fan bearing cages and for motor shaft spacers. The high-speed bearings were based on designs that had been used in gyroscopes, according to Dyson. Improved materials, precision manufacturing, and a wider design helped produce a bearing that could meet the speed and life requirements of the new cleaner.

A four-phase, 1/2-horsepower variable-switched-reluctance motor, used in applications such as electric motor scooters and industrial fans, can run at more than 90-percent efficiency. A VSR motor is generally used as a stepper motor and, if properly controlled, can be made to behave like a servomotor. Basically, the motor is a rotor and stator with a coil winding in the stator. The rotor, which consists of a laminated permeable material with teeth, is a passive device with no coil winding or permanent magnets. The stator typically consists of slots containing a series of coil windings, the energization of which is electronically switched to generate a moving field. For the most part, only a single coil set is activated at any one time.

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