Rotary and linear motor
OwnerHui Liinventor
Life of this patent
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Abstract
A rotary and linear motor having a rotor, a casing and a plurality of stator coils mounted to the interior of the casing spaced from the rotor and radially spaced apart around the rotor. A rotary and linear motor control circuit is operative to receive input data signals and to process these data signals so as to produce a plurality of pulse width modulated output control signals. A multi-phase inverter circuit is coupled to an output of the rotary and linear motor control circuit and is responsive to the plurality of output control signals to drive the stator coils and produce a desired z-axis displacement, z, and rotor angular displacement, θ.
Claims14
A rotary and linear motor having a rotor and a motor casing, said rotary and linear motor, comprising:
- (a) a rotor of permanent magnetic material having at least one north magnetic pole and one south magnetic pole, said north and said south magnetic poles being transverse to an axis of rotation of said rotor, said rotor mounted within said motor casing both for rotation and for movement along the axis of rotation of said rotor;
- (b) a plurality of multi-phase stator coils spaced around an interior surface of said motor casing, positioned to be cut by a magnetic field of said rotor as said rotor rotates;
- and
- (c) a rotary and linear motor control circuit coupled to said stator coils and operative to control the current through said stator coils so that a magnetic field of said stator coils produced by said current interacts with the magnetic field produced by the permanent magnet poles of said rotor to produce both a torque and a linear force on said rotor.
A method of controlling linear and rotary movement of a motor having a plurality of stator coils radially spaced around a rotor, said rotor having at least one magnetic pole, comprising:
- a) transforming the coil currents through said stator coils into a current, Id, through a notional coil having a d-axis parallel to a pole of said rotor and a current, Iq, through a notional coil having a q-axis perpendicular to said d-axis;
- b) employing current Iq to control the angular position of said rotor;
- and
- c) employing current Id to control the linear position of said rotor.
Dependencies are inferred from the claim text.