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US 12,580,502 B2Granted
Dual motor system with flow control
AssigneeNidec Motor Corporation
InventorsEric Coupart, James D. Ellis, II, Pranesh Rao, John G. Schrader, Bret S. Clark
Life of this patent
Estimating the term…
Abstract
A dual motor system includes a first motor providing a lower speed range and a second motor providing a higher speed range, wherein the motors are coaxially arranged and aligned on and drive a common shaft, and a motor control system controlling the speed of the first motor and engaging the second motor as needed. The first motor provides a lower two-thirds of a full speed range, and the second motor provides the upper one-third in the form of one or more discrete fixed speeds. The system may also include a flow control system for automatically controlling the speed of the motors for particular applications, such as flow control in a pool.
Claims20
A dual motor system with flow control, the dual motor system comprising:
- a first motor of a first type including a first stator and a first rotor providing a lower speed range under a first type of control;
- a second motor of a second type including a second stator and a second rotor providing a higher speed range under a second type of control;
- a common shaft, wherein the first and second motors are coaxially arranged and aligned on a common axis defined by the common shaft and configured to drive the common shaft;
- a pump coupled with and driven by the common shaft and configured to pump a volume of a fluid;
- and
- a motor control system including a flow control system configured to control the first motor and engage the second motor to control a speed of the common shaft and pumping of the volume of the fluid by the pump,
- wherein the motor control system engaging the second motor includes—
- increasing the speed of the first motor to between two thousand seven hundred and two thousand eight hundred revolutions per minute,
- raising a speed demand to between three thousand four hundred and three thousand five hundred revolutions per minute, wherein an actual speed is between two thousand seven hundred and two thousand eight hundred revolutions per minute,
- limiting a torque available to a speed control loop, and
- waiting for the speed loop demand to reach between three thousand four hundred and three thousand five hundred revolutions per minute and then turning on the second motor.
8 more elements
A dual motor system with flow control, the dual motor system comprising:
- a first motor which is a variable speed synchronous motor providing a lower speed range with a variable speed drive, the first motor having a first rotor;
- a second motor which is an asynchronous induction motor providing a higher speed range with a non-variable speed drive, the second motor having a second rotor;
- a common shaft, wherein the first and second motors are coaxially arranged and aligned on a common axis defined by the common shaft and configured to drive the common shaft, with the first and second rotors being fixed to the common shaft;
- a pump coupled with and driven by the common shaft and configured to pump a volume of a fluid;
- and
- a motor control system including a flow control system configured to control the first motor and engage the second motor to control a speed of the common shaft and pumping of the volume of the fluid by the pump, with the flow control system providing at least four speeds, wherein the motor control system engaging the second motor includes—
- increasing the speed of the first motor to between two thousand seven hundred and two thousand eight hundred revolutions per minute,
- raising a speed demand to between three thousand four hundred and three thousand five hundred revolutions per minute, wherein an actual speed is between two thousand seven hundred and two thousand eight hundred revolutions per minute,
- limiting a torque available to a speed control loop, and
- waiting for the speed loop demand to reach between three thousand four hundred and three thousand five hundred revolutions per minute and then turning on the second motor.
7 more elements
A dual motor system with flow control, the dual motor system comprising:
- a first motor which is a variable speed synchronous motor providing a lower speed range of up to between two thousand eight hundred and three thousand revolutions per minute with a variable speed drive, the first motor having a first rotor;
- a second motor which is an asynchronous induction motor providing a higher speed range defined by at least two higher speeds over three thousand revolutions per minute with a non-variable speed drive, the second motor having a second rotor;
- a common shaft, wherein the first and second motors are coaxially arranged and aligned on a common axis defined by the common shaft and configured to drive the common shaft, with the first and second rotors being fixed to the common shaft;
- a pump coupled with and driven by the common shaft and configured to pump a volume of a fluid;
- and
- a motor control system including a flow control system configured to control the first motor and engage the second motor to control a speed of the common shaft and pumping of the volume of the fluid by the pump, with the flow control system providing at least four speeds,
- wherein the motor control system engaging the second motor includes—
- increasing the speed of the first motor to between two thousand seven hundred and two thousand eight hundred revolutions per minute,
- raising a speed demand to between three thousand four hundred and three thousand five hundred revolutions per minute, wherein an actual speed is between two thousand seven hundred and two thousand eight hundred revolutions per minute,
- limiting a torque available to a speed control loop, and
- waiting for the speed loop demand to reach between three thousand four hundred and three thousand five hundred revolutions per minute and then turning on the second motor.
8 more elements
Dependencies are inferred from the claim text.