Detection of unbalanced phase resistances in synchronous motor drives
US-11804799-B2 · Oct 31, 2023 · US
Identification of current gain errors and resistance imbalance in feedback current-controlled synchronous motor drive systems
US12418255B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12418255-B2 |
| Application number | US-202318484275-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 10, 2023 |
| Priority date | Oct 10, 2023 |
| Publication date | Sep 16, 2025 |
| Grant date | Sep 16, 2025 |
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Abstract
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A method for detecting and distinguishing a current measurement gain error and a resistance imbalance in a motor drive system includes: determining a first voltage command signal, a first motor position signal, and a first quadrature-axis current command when the motor is rotating at a first speed; computing, based on the first voltage command and motor position signals, a first demodulated voltage signal; determining a second voltage command signal, a second motor position signal, and a second quadrature-axis current command while the motor is rotating at a second speed that is different than the first speed; computing, based on the second voltage command and the motor position signals, a second demodulated voltage signal; and computing a resistance imbalance flag indicating a resistance imbalance and a current gain error flag indicating a current sensing gain error.
First claim
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What is claimed is: 1. A method for detecting and distinguishing a current measurement gain error and a resistance imbalance in a motor drive system, the method comprising: determining, for a motor, a first voltage command signal, a first motor position signal, and a first quadrature-axis current command, when the motor is rotating at a first speed; computing, based on the first voltage command signal and the first motor position signal, a first demodulated voltage signal; determining a second voltage command signal, a second motor position signal, and a second quadrature-axis current command when the motor is rotating at a second speed that is different than the first speed; computing, based on the second voltage command signal and the second motor position signal, a second demodulated voltage signal; and computing, based on the first demodulated voltage signal, the second demodulated voltage signal, the first quadrature-axis current command, and the second quadrature-axis current command, each of a resistance imbalance flag and a current gain error flag, wherein the resistance imbalance flag has a non-zero value in response to a resistance imbalance in the motor and is unaffected by a current sensing gain error, and wherein the current gain error flag has a non-zero value in response to a current sensing gain error and is unaffected by a resistance imbalance in the motor. 2. The method of claim 1 , wherein the first speed corresponds to the motor producing a torque that is invariant of speed, and the second speed is greater than the first speed and corresponds to a d-axis current command substantially equal to zero. 3. The method of claim 1 , wherein each of the first demodulated voltage signal and the second demodulated voltage signal includes two components V u , V v which are computed as: [ V u V v ] = [ cos 2 θ e sin 2 θ e sin 2 θ e - cos 2 θ e ] [ V d V q ] where θ e is a corresponding one of the first motor position signal or the second motor position signal representing an electrical position of the motor, and V d , V q are direct-axis and quadrature-axis components of a corresponding one of the first voltage command signal or the second voltage command signal. 4. The method of claim 1 , wherein computing the resistance imbalance flag includes calculating the resistance imbalance flag in accordance with an equation: A = ( V u 1 I q 1 * + ω e 1 ( V u 2 I q 2 * - V u 1 I
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Classifications
Current control, e.g. using a current control loop · CPC title
Synchronous machines, e.g. with permanent magnets or DC excitation · CPC title
- H02P21/13Primary
Observer control, e.g. using Luenberger observers or Kalman filters · CPC title
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- What does patent US12418255B2 cover?
- A method for detecting and distinguishing a current measurement gain error and a resistance imbalance in a motor drive system includes: determining a first voltage command signal, a first motor position signal, and a first quadrature-axis current command when the motor is rotating at a first speed; computing, based on the first voltage command and motor position signals, a first demodulated vol…
- Who is the assignee on this patent?
- Steering Solutions Ip Holding
- What technology area does this patent fall under?
- Primary CPC classification H02P21/13. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Sep 16 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).