Arrangement for slipring-free measurement of rotor current of an

Details Arrangement for slipring-free measurement of rotor current of an Arrangement for slipring-free measurement of rotor current of an

1977-04-08

1979-02-20

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 72, 310168, 324158MG, 324 51, H02K 1100

Patent

active

041409337

ABSTRACT:
Measurement of the current flowing in the rotor of an electrical machine and especially an a.c. exciter with external poles for excitation of a synchronous machine by way of a rectifier mounted on the rotor is accomplished without the use of sliprings by means of at least one pair of contra-wound coils extending in the axial direction of the rotor, the coils being connected in series and mounted in a slotted support of insulation material secured to the underface of a pole shoe in the gap between shoe and a toothed rotor. A voltage proportional to the rotor current is induced in the pair of coils by the stray flux generated by the current carrying conductors in the rotor slots. The width of each coil approximates the width of one tooth on the rotor and the spacing between the axes of the coils approximates the size of the rotor slot pitch.

REFERENCES:
patent: 1522196 (1925-01-01), MacMillan
patent: 1836882 (1931-12-01), Nilsson-Stig
patent: 2640100 (1953-05-01), Packer et al.
patent: 2794136 (1957-05-01), Kalikow et al.
patent: 3133214 (1964-05-01), Lawson et al.
patent: 3624504 (1971-11-01), Joly
patent: 3855529 (1974-12-01), Langweiler
patent: 3867657 (1975-02-01), Vates et al.

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