Linear motors

Details Linear motors Linear motors

1990-09-05

1992-02-25

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Linear

310 13, 318135, H02K 4100

Patent

active

050916653

ABSTRACT:
A linear motor comprises a stator 1 and an armature 2 provided, respectively, with a set of spaced apart permanent magnets and a set of drive coils (not shown). The permanent magnets produce a radial magnetic field whose strength varies periodically along the length of the stator 1. The field strength is to derive speed and position signals by means of detectors constituted by field coils 4 (FIG. 1) and Hall Effect sensors 10 (FIG. 5). The periodic variation of the field strength is compensated for in the case of the field coils 4 by staggering their phases along the length of the armature and selectively combining their outputs; in the case of the Hall Effect sensors, the periodical variation is used to derive positional information.

REFERENCES:
patent: 4661730 (1987-04-01), Maruyama et al.
patent: 4868431 (1990-09-01), Karita et al.
patent: 4965864 (1990-10-01), Roth et al.

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