Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1977-11-30
1982-01-12
Caldwell, Sr., John W.
Electrical generator or motor structure
Dynamoelectric
Rotary
188181R, 303 94, 310111, 310115, 324173, 340 62, 340671, 34087031, H02K 2138, G08C 1912
Patent
active
RE0308471
ABSTRACT:
A rotation indication system having an improved sensing device for determining the velocity of a rotating body is disclosed. The improved sensing device is tubular in configuration and includes a source of magnetic flux and two pole pieces that define a split magnetic field. The sensing device is mounted in close proximity to a rotor which is connected to the rotating body. The rotor has apertures which interrupt the split magnetic field producing an output signal with a frequency proportional to the velocity of the rotating body. The sensing device is oriented relative to the rotor apertures so that each pole piece is alternatively in register with an aperture to produce the desired output signal. Since the sensing device is tubular in shape, it can be rotated about its axis to obtain the desired orientation with the rotor apertures, thus permitting the use of the sensing device with a wide range of rotor diameters having various aperture spacings.
REFERENCES:
patent: 2941120 (1960-06-01), Harmon et al.
patent: 3020527 (1962-02-01), MacLaren
patent: 3551712 (1970-12-01), Jones et al.
patent: 3854556 (1974-12-01), Gee
patent: 3961214 (1976-06-01), Lokkart
patent: 3988624 (1976-10-01), Urban
patent: 4027753 (1977-06-01), Lantz
patent: 4029180 (1977-06-01), Gee
patent: 4110647 (1978-08-01), Eslinger et al.
Caldwell Sr. John W.
Eaton Corporation
Groody James J.
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