Back to results
US 7,135,830 B2Granted
System and method for identifying operational parameters of a motor
AssigneeReliance Electric Technologies, LLC
InventorYehia El-Ibiary
Life of this patent
Estimating the term…
Abstract
A system and method for establishing estimated values of electrical parameters of a motor. The electrical parameters may be established from stator resistance data and motor data obtained at a single load on the motor. The electrical parameters also may be established without stator resistance data by using motor data at three load conditions of the motor. The electrical parameters also may be established from baseline motor data and motor data obtained at a desired operating load of the motor. Based on the estimated values, the system and method also may be used to estimate motor operating parameters, such as torque, efficiency, output power, output speed, and other performance criteria of the motor.
Claims66
A system for estimating parameters of a motor, the system comprising:
- an electronic device comprising:
- a first module that is operable to receive electrical input data obtained at first and second load points of an electric motor;
- and
- a second module that is operable to calculate a first estimated value of a first estimated variable of the electric motor based on the electrical input data obtained at the first and second load points of the electric motor, and to calculate a second estimated value of a second estimated variable of the motor based on the first estimated variable, wherein the electronic device is operable to calculate the first and second estimated values during operation of the motor without disconnecting the motor from a load.
1 more element
An electric motor system for estimating a parameter of a motor, the system comprising:
- an electronic device comprising:
- a first module that is operable to receive electrical input data obtained at first, second, and third load points of an electric motor;
- and
- a second module that is operable to calculate a first estimated value of a first estimated variable of the electric motor based on the electrical input data obtained at the first, second, and third load points of the electric motor, and to calculate a second estimated value of a second estimated variable of the motor based on the first estimated variable, the second estimated variable including an operating parameter, wherein the electronic device is operable to calculate the first and second estimated values during operation of the motor without removing the motor from service.
1 more element
A system for estimating parameters of a motor, the system comprising:
- an electronic device comprising:
- a first module that is operable to receive baseline motor parameters of an inverter-driven electric motor and to receive electrical input data obtained at a desired operating condition of the inverter-driven electric motor;
- and
- a second module that is operable to calculate a first estimated value of a first estimated variable of the inverter-driven electric motor based on the baseline motor parameters and based on the electrical input data obtained at the desired operating condition of the inverter-driven electric motor, and to calculate a second estimated value of a second estimated variable of the motor based on the first estimated variable, wherein the baseline motor parameters comprise a first motor frequency and the desired operating condition comprises a second motor frequency, and wherein the electronic device is operable to calculate the first and second estimated values during operation of the motor without disconnecting the motor from a load.
1 more element
A system for estimating parameters of a motor, the system comprising:
- means for obtaining an estimated value of a first estimated variable of an electric motor based on electrical input data of the electric motor, the first estimated variable comprising an electrical parameter of the electric motor;
- and
- means for estimating a value of a second estimated variable of the electric motor based at least partially on the means for obtaining the estimated value of the first estimated variable, the second estimated variable comprising at least one operating parameter of the electric motor.
A machine readable medium having application instructions for analyzing an electric motor stored thereon, comprising:
- a first module adapted to calculate an estimated value of a first estimated variable of the electric motor during operation of the motor based at least partially on measured motor parameters, the first estimated variable comprising an electrical parameter;
- and
- a second module adapted to estimate a value of a second estimated variable of the electric motor based at least partially on the first estimated variable, without interfering with the operation of the motor, wherein the second estimated variable comprises an operating parameter of the electric motor.
A motor analysis device, comprising:
- a first module comprising a plurality of motor estimation modules adapted to estimate a first value of a first estimated variable of an electric motor based on input parameters, which are at least partially different for each of the plurality of motor estimation modules;
- and
- a second module adapted to estimate a second value of a second estimated variable of the motor based on the first estimated variable;
- wherein the first module is operable to calculate the first and second estimated values during operation of the motor without disconnecting the motor from a load.
1 more element
A method of analyzing a motor having a rotor and a stator, comprising:
- providing an instrumentation system with stator resistance data for the motor;
- providing the instrumentation system with output speed and electrical input data obtained during operation of the motor at first and second load points of the motor;
- operating the instrumentation system during operation of the motor and without disconnecting the motor from a load to calculate an estimated value of a first estimated variable of the motor based on the stator resistance data and the electrical input data;
- and
- operating the instrumentation system to calculate an estimated value of a second estimated variable of the motor based on the first estimated variable.
2 more elements
A method of operating a motor having a rotor and a stator, comprising:
- providing an instrumentation system with motor speed and electrical input data obtained during operation of the motor with first, second, and third loads on the motor;
- operating the instrumentation system during operation of the motor and without removing the motor from service to calculate an estimated value of a first estimated variable of the motor based on the motor speed and electrical input data obtained during operation of the motor with the first, second, and third load points on the motor;
- and
- operating the instrumentation system to calculate an estimated value of a second estimated variable of the motor based on the first estimated variable.
1 more element
A method of operating an inverter-driven motor, comprising:
- providing an instrumentation system with baseline parameters of the inverter-driven motor at a first frequency;
- providing the instrumentation system with electrical input data obtained forte inverter-driven motor operating at a second frequency;
- operating the instrumentation system during operation of the motor and without disconnecting the motor from a load to calculate a first estimated operational parameter of the inverter-driven motor based on the baseline parameters and the electrical input data;
- and
- operating the instrumentation system to calculate a second estimated operational parameter of the inverter-driven motor based on the first estimated operational parameter.
2 more elements
Dependencies are inferred from the claim text.