Back to results
US 2014/0358458 A1Published application
Systems and methods for estimating input power of an electric motor
AssigneeNidec Motor Corporation
InventorsPrakash B. Shahi, Robert J. Ploof, JR.
Life of this patent
Estimating the term…
Abstract
A method of estimating an input power of a motor comprises determining an output power of the motor; determining a speed of the motor; calculating a scaling factor as a function of the speed of the motor; and estimating the input power as a function of the scaling factor and the output power.
Claims16
A method of estimating an input power of an electric motor, the method comprising:
- determining an output power of the motor;
- determining a speed of the motor;
- calculating a scaling factor as a function of the speed of the motor;
- and
- estimating the input power as a function of the scaling factor and the output power.
2 more elements
An electric motor assembly comprising:
- an electric motor including—
- a stator;
- a rotor rotabably coupled with the stator;
- a motor shaft rotatable with the rotor;
- and
- a motor controller for driving the electric motor, the motor controller having non-transitory memory and a computer programmed stored in the non-transitory memory for estimating an input power of the motor according to the following steps:
- determining an output power of the motor;
- determining a speed of the motor;
- calculating a scaling factor as a function of the speed of the motor;
- and
- estimating the input power as a function of the scaling factor and the estimated output power.
8 more elements
An electric motor assembly comprising:
- an electric motor including—
- an enclosure;
- a stator mounted in the enclosure;
- a rotor rotabably coupled with the stator;
- a motor shaft rotatable with the rotor;
- and
- a motor controller positioned in the enclosure for driving the electric motor, the motor controller having non-transitory memory and a computer programmed stored in the non-transitory memory for estimating an input power of the motor according to the following steps:
- estimating an output power of the motor as a function of the speed of the motor and a torque of the motor;
- determining a speed of the motor;
- calculating a scaling factor as a function of the speed of the motor;
- and
- estimating the input power as a function of the scaling factor and the estimated output power using the equation:
- input power=(−K1X2+K2X+K3) times output power, where K1, K2, and K3 are constants and X is the speed of the motor.
10 more elements
Dependencies are inferred from the claim text.