Screened inductance sensors for brushless d.c. motors

Details Screened inductance sensors for brushless d.c. motors Screened inductance sensors for brushless d.c. motors

1988-04-15

1989-09-19

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318138, H02K 2912

Patent

active

048684686

ABSTRACT:
In a screened inductance sensor for a brushless d.c. motor, a sensor rotor carrying conductive screens is mounted on an extension of the motor shaft. A single solenoidal drive winding on a stator of the sensor establishes a drive field, when energized, which induces a voltage in a sense winding, also carried on the stator. This sense winding is laid around the periphery of a notional cylinder coaxial with the rotor and stator and has series-connected loops of generally rectangular configuration when viewed in development. The screens pass between the drive winding and the sense winding in operation of the sensor to modulate the sense winding output by shading the drive field. The single drive winding is located radially inwardly of one axial end of the sense winding, so that this axial end is aligned with an axially central region of the drive winding midway between its axial ends.

REFERENCES:
patent: 4259603 (1981-03-01), Uchiyama et al.
patent: 4305024 (1981-12-01), Kuroki
patent: 4612486 (1986-09-01), Ban et al.
patent: 4737698 (1988-04-01), McMullin et al.

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