Linear motor

Details Linear motor Linear motor

H - Electricity

02

K

H02K 33/00 (2006.01) F04B 17/04 (2006.01) F25B 31/02 (2006.01) H02K 41/02 (2006.01)

Patent

CA 2475936

The present invention provides an improved design of linear motor as well as an improved control strategy. The design allows for a shorted stator, where the armature magnets are controlled to reciprocate to a greater maximum displacement than for an equivalent conventional linear motor. The control strategy is such that a minimum of external sensors are required. The linear motor is driven at its resonant frequency ensuring optionally efficient operation. A determination of the maximum current is made based on a relationship with the resonant frequency and the evaporating temperature/pressure of the vapour entering the compressor. The current is then limited to control the maximum displacement to avoid damage.

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