# US 2025/0125752 A1 · Methods for configuring a motor drive and apparatuses for implementing the same

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- Number: US 2025/0125752 A1
- Document ID: US20250125752A1
- Status: Published application
- Kind: A1
- Application number: 18/908,989
- Filed: 2024-10-08
- Published: 2025-04-17
- Earliest claimed: 2023-10-13
- Assignees: Schneider Toshiba Inverter Europe SAS
- Applicants: Schneider Toshiba Inverter Europe SAS
- Inventors: Mohamed Mroueh; Al Kassem Jebai; Emmanuel Frappé
- Web page: https://patentgrep.com/patent/US20250125752A1

## CPC

- H02P 21/16: Estimation of constants, e.g. the rotor time constant
- H02P 21/141: {Flux estimation}
- H02P 25/062: of the induction type
- H02P 2207/01: Asynchronous machines
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

A method for configuring a motor drive for driving an induction motor. The method includes the motor comprising a rotor and a magnetic core including a magnetic inductance component: performing a plurality of N measurements of a voltage at motor terminals of the motor at standstill during demagnetization of the magnetic core of the motor; determining, based on the N voltage measurements, an estimate of the magnetic inductance component of the motor operating in a linear regime; determining, based on one of the N voltage measurements, an estimate of a time constant of the rotor of the motor operating in a linear regime; and determining an estimate of a rotor resistance of the motor based on the estimate of the magnetic inductance component of the motor and the rotor time constant.

## Claims

### Claim 1

A method for configuring a motor drive for driving an induction motor, the method comprising, the motor comprising a rotor and a magnetic core comprising a magnetic inductance component:
performing a plurality of N measurements of a voltage at motor terminals of the motor at standstill during demagnetization of the magnetic core of the motor;
determining, based on the N voltage measurements, an estimate of the magnetic inductance component of the motor operating in a linear regime;
determining, based on one of the N voltage measurements, an estimate of a time constant of the rotor of the motor operating in a linear regime; and
determining an estimate of a rotor resistance of the motor based on the estimates of the magnetic inductance component of the motor and the rotor time constant.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising: configuring the motor drive based on the estimate of the rotor resistance of the motor.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising: prior to each voltage measurement, injecting a respective value of Direct Current, DC, current in the motor at standstill for a respective time duration of magnetization of the magnetic core of the motor, wherein the respective value of DC current is one of a set of respective values of DC current having different levels.

### Claim 4 (depends on 1)

The method according to claim 1, further comprising: for each voltage measurement, determining an estimate of a magnetic flux in the magnetic inductance component of the motor based on the voltage measurement.

### Claim 5 (depends on 1)

The method according to claim 1, further comprising: determining a plurality of N duplets of current and magnetic flux values, based on the N voltage measurements performed further to injecting respective values of DC current in the motor at standstill for respective time periods.

### Claim 6 (depends on 5)

The method according to claim 5, further comprising: determining one or more parameters of a magnetic saturation model of the magnetic inductance component of the motor based on the plurality of N duplets of current and magnetic flux values.

### Claim 7 (depends on 6)

The method according to claim 6, further comprising: determining a magnetic saturation curve corresponding to the magnetic saturation model that fits a plurality of N points respectively corresponding to the N duplets of current and magnetic flux values.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the magnetic saturation curve is determined using a linear regression algorithm.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the estimate of the time constant of the rotor is determined based on the one of the N voltage measurements using an exponential regression algorithm.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the motor is an asynchronous induction motor.

### Claim 11 (depends on 1)

The method according to claim 1, wherein one or more of the measurements of the voltage comprises a plurality of S voltage measurement data points (vi)1≤i≤s, S being a non-zero natural integer.

### Claim 12 (depends on 1)

An apparatus, the apparatus comprising a processor, a memory operatively coupled to the processor, and an interface for coupling to an induction motor to be driven by the apparatus, wherein the apparatus is configured to perform the method according to claim 1.

### Claim 13 (depends on 1)

A computer program product comprising a non-transitory computer readable medium having computer program code stored thereon, said computer program code comprising instructions to, when provided to a computer system and executed, cause said computer system to perform the method according to claim 1.

### Claim 14

(canceled)