Electric motor for viscous pumping
AssigneeSola Sewers Pty Ltd
InventorLucas Robert Cant
Life of this patent
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Abstract
An electric motor for viscous pumping, wherein the electric motor is a brushless DC motor configured to be driven by a low DC voltage of around 40-60 VDC, and includes: a rotor with permanent magnets; a stator with a stack of laminations and windings wound therearound; and a controller to provide electronic commutation of electric current flowing through the windings; wherein the windings and the stack of laminations are configured to handle at least 1 kW of continuous electric power from the controller, and the controller includes a feedback circuit including a rotation sensor coupled to the rotor and having an angular resolution of at least 1/500th of a revolution to allow the controller to control the torque generated by the electric motor to a corresponding extent.
Claims20
An electric motor for viscous pumping,
- wherein the electric motor is a brushless DC motor and includes:
- a rotor with permanent magnets;
- a stator with a stack of laminations and windings wound therearound;
- and
- a controller to provide electronic commutation of electric current flowing through the windings;
- wherein the windings and the stack of laminations are configured to be driven by a low DC voltage of around 40-60 VDC at a continuous electric power of least 1 kW from the controller, the stack of laminations has a length of at least about 90 cm in a direction parallel to a longitudinal axis of the rotor, the permanent magnets and the stack of laminations are skewed with respect to one another to smooth torque fluctuations, and the controller includes a feedback circuit including a rotation sensor coupled to the rotor and having an angular resolution of at least 1/500th of a revolution to allow the controller to control the torque generated by the electric motor to a corresponding extent so that the motor can deliver a variable torque within each rotation of the rotor to maintain rotational speed under a correspondingly and unpredictably variable load such as driving a pump for viscous sewage.
A method of producing an electric motor for viscous pumping, including the steps of:
- providing a rotor with permanent magnets;
- coupling the rotor to a rotation sensor having an angular resolution of at least 1/500th of a revolution;
- forming a stator with a stack of laminations and winding wire windings therearound such that the windings and the stack of laminations are configured to handle at least 1 kW of continuous electric power;
- and
- forming a controller to provide electronic commutation of electric current flowing through the windings, wherein the controller includes a feedback circuit coupled to the rotation sensor to allow the controller to control the torque generated by the electric motor to a corresponding extent;
- wherein the electric motor is a brushless DC motor, the windings and the stack of laminations are configured to be driven by a low DC voltage of around 40-60 VDC at a continuous electric power of least 1 kW from the controller;
- the stack of laminations has a length of at least about 90 cm in a direction parallel to a longitudinal axis of the rotor, the permanent magnets and the stack of laminations and skewed with respect to one another to smooth torque fluctuations, and the feedback circuit includes a rotation sensor coupled to the rotor and having an angular resolution of at least 1/500th of a revolution to allow the controller to control the torque generated by the electric motor to a corresponding extent so that the motor can deliver a variable torque within each rotation of the rotor to maintain rotational speed under a correspondingly and unpredictably variable load such as driving a pump for viscous sewage.
Dependencies are inferred from the claim text.