Motor with integral controller
First Claim
Patent Images
1. A combination comprising an electric motor requiring low input power;
- and solid-state controller means, mounted on said motor, including;
commutation means for commutating current through selected stator windings of said motor,command means for generating a current command indicating an amount of current that should be flowing through said selected stator windings, andclosed loop current means, responsive to said current command, for maintaining said current flowing through said selected stator windings at said amount commanded by said current command.
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Abstract
A solid state controller is mounted directly to a permanent magnet, brushless DC motor. The controller operates the motor at constant torque and variable speed. Speed is determined in accordance with density of the through flow. The motor and controller can be employed to circulate fluid in a circulation loop having variable pressure.
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Citations
14 Claims
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1. A combination comprising an electric motor requiring low input power;
- and solid-state controller means, mounted on said motor, including;
commutation means for commutating current through selected stator windings of said motor, command means for generating a current command indicating an amount of current that should be flowing through said selected stator windings, and closed loop current means, responsive to said current command, for maintaining said current flowing through said selected stator windings at said amount commanded by said current command. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- and solid-state controller means, mounted on said motor, including;
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11. A combination comprising
a brushless motor requiring low input power, said motor having a rotor and a stator; -
at least one position sensor means, responsive to said motor, for providing square-wave output signals that indicate the orientation of said rotor with respect to said stator; and solid-state controller means, mounted on said motor, for controlling the operation of said motor, said controller means including commutation means, responsive to said square-wave output signals, for commutating power to selected windings of said stator;
means for providing a speed error signal;
converting means, for converting said speed error signal into a current command; and
closed loop current means, responsive to said current command, for maintaining said current flowing through said selected windings at an amount commanded by said current command.
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12. A solid state controller for an electric motor providing at least one position sensor signal, each position sensor signal including a stream of pulses whose frequency is proportional to motor speed, said controller comprising;
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speed detector means for detecting motor speed, including a first op amp having inverting and non-inverting inputs and an output, first resistor means, coupled between said inverting input and said output of said first op amp, first capacitor means, coupled between said non-inverting input and a reference potential, and squeaking means, responsive to one of said at least one position sensor signals, for squeaking said capacitor, whereby said first op amp provides an output signal proportional to said motor speed; speed regulator means, responsive to said output signal and to a speed command, for providing current commands; and commutation means, responsive to said current command and said at least one position sensor signal, for commutating power to said electric motor. - View Dependent Claims (13, 14)
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Specification