DC Excitation control for linear oscillating motors
AssigneeMechanical Technology Incorporated
InventorsHoward L. Clark, Richard A. Dorman, Paul Back
Life of this patent
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Abstract
A control method and system for quasi-proportionally controlling the magnitude of DC excitation current supplied to the DC field coil windings of a linear reciprocating motor in proportion to the magnitude of the AC excitation current supplied to the AC field coil windings of the motor.
Claims11
A control system for proportionally controlling the magnitude of DC excitation current supplied to the DC field coil of a linear reciprocating motor in quasi-proportion to the magnitude of the AC excitation current supplied to the AC field coil of the motor;
- said control system comprising AC coil current sensing means for sensing the magnitude of the AC current flowing in the AC coils of the linear reciprocating motor and deriving a control signal voltage representative of the magnitude of the AC coil current, and means responsive to the control signal voltage for deriving an output DC coil excitation current which is quasi-proportional to the magnitude of the AC coil excitation current for supply to the DC field coil of the linear motor.
A method for operating electrodynamic linear reciprocating motors having both DC and AC field coil windings for producing electromagnetic fields that induce linear reciprocating motion of a magnetically permeable armature member comprising a part of the motor;
- said method comprising quasi-proportionally controlling the magnitude of the DC excitation current supplied to the DC field coil windings of the linear motor in proportion to the magnitude of the AC excitation current supplied to the AC field coil windings of the motor.
Dependencies are inferred from the claim text.