Machine element or mechanism – Gyroscopes – Multiple gyroscopes
Patent
1979-03-05
1982-03-23
Bonck, Rodney H.
Machine element or mechanism
Gyroscopes
Multiple gyroscopes
73504, 74 546, 74 56D, 74 57, G01C 1908, G01C 1928, G01C 1930
Patent
active
043206697
ABSTRACT:
A two degree of freedom gyro having an axial gap, permanent magnet motor. The gyro motor includes a stator having two sets of series connected coils wound in quadrature. The motor further includes a rotor which is adapted for continuous rotation about a spin axis, and for rotational displacements about the two orthogonal input axes. The rotor includes a set of permanent magnets supported so that the moment of each of the magnets is substantially parallel to the spin axis, with the magnetic moment of adjacent magnets being oppositely directed. The rotor is positioned with respect to the stator so that flux from the magnets is coupled to the coils. The rotor also includes a return ring for establishing a magnetic flux return path for completing a circuitous path for flux passing through the coil. An excitation network for the coils detects back emf in the respective coils, and generates control signals for driving alternating currents in the respective sets of coils. The alternating currents have a 90.degree. relative phase shift and are in phase with the detected back emf. The gyro also includes network for detecting rotational displacement of the rotor about the input axes, and for generating balance control signals representative of such displacements. Torquers are responsive to these balance control signals to torque the rotor to maintain the spin axis of the rotor substantially coaxial with the spin reference axis.
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"Development of Back EMF Control Electronics for a PM Gyro Wheel", Fulton 6/76, The Charles Stark Draper Lab., Inc.
Bonck Rodney H.
Northrop Corporation
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