Linear motor

Details Linear motor Linear motor

2005-03-08

2005-03-08

Lam, Thanh (Department: 2834)

Electricity: motive power systems

Impact, mechanical shock, or vibration-producing motors

C318S135000, C318S119000, C417S044110, C310S012060, C310S015000, C310S036000

Reexamination Certificate

active

06864647

ABSTRACT:
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 that for a 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 vapor entering the compressor. The current is then limited to control the maximum displacement to avoid damage.

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