Variable reluctance resolver

Details Variable reluctance resolver Variable reluctance resolver

1992-10-23

1993-10-05

Ro, Bentsu

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

310168, 341116, 318605, H02M 538

Patent

active

052508897

ABSTRACT:
A variable reluctance resolver comprises a rotor core and stator magnetic poles structured to enable reluctance in the space between the rotor core and stator magnetic poles to be changed by the positions of the rotor core and to make the fundamental wave component of the reluctance variation N cycles per revolution of the rotor core, N being an integer of 1 or more; first magnetic poles having a predetermined number 3N phases arranged at equal intervals on the stator magnetic poles; second magnetic poles having a predetermined number of 3N phases formed in the central positions between the first magnetic poles; excitation coils arranged individually between the first and second magnetic poles and connected in series to each other for each phase of the magnetic poles; a current change detecting device for detecting current value change due to the variation of the reluctance when an alternating current is applied to the magnetic coils of each phase of the magnetic poles; 3N difference value calculating devices for calculating the difference values between the detected current values of the first magnetic poles and second magnetic poles of each phase detected by the current change detecting device; a phase converting device for converting the output of the difference value of the difference value calculating device into a 2N-phase; and a signal processing device for calculating rotational angles or rotational speeds on the basis of the converted outputs of the phase converting device.

REFERENCES:
patent: 4700189 (1987-10-01), Welburn
patent: 4733117 (1988-03-01), Perrins
patent: 4794511 (1988-12-01), Lundin

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