System and method for sensorless control of electric machines using magnetic alignment signatures
US-9948224-B1 · Apr 17, 2018 · US
Monitoring device for a reluctance machine and method for monitoring
US11201575B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11201575-B2 |
| Application number | US-201816649529-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 13, 2018 |
| Priority date | Sep 22, 2017 |
| Publication date | Dec 14, 2021 |
| Grant date | Dec 14, 2021 |
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Abstract
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A monitoring device for a reluctance machine includes a vector rotator for rotating a space phasor of the reluctance machine that depends on a voltage in a coordinate system that rotates with a negative fundamental frequency, a low-pass filter filtering the rotated space phasor and producing an output signal, and a signal evaluation device evaluating the output signal. A DC value of the produced output signal in the rotating coordinate system is monitored, and an error in operating the reluctance machine is identified when the DC value is above a predefined threshold value.
First claim
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The invention claimed is: 1. A monitoring device for a reluctance machine, comprising: a vector rotator for rotating a space phasor of the reluctance machine that depends on a voltage into a coordinate system that rotates with a negative fundamental frequency, a low-pass filter filtering the rotated space phasor and producing an output signal, and a signal evaluation device evaluating the output signal. 2. The monitoring device of claim 1 , wherein the space phasor is a voltage phasor. 3. The monitoring device of claim 1 , wherein the signal evaluation device comprises an absolute-value generator and a threshold comparator. 4. A method for monitoring a reluctance machine, comprising: transforming a space phasor for a flux that depends on a voltage, into a coordinate system that rotates with a negative fundamental frequency; producing an output signal by low-pass-filtering the transformed space phasor; monitoring a DC value of the produced output signal in the rotating coordinate system; and identifying an error in operating the reluctance machine when the DC value is above a predefined threshold value. 5. The method of claim 4 , further comprising generating the DC value of the produced output signal with a low-pass filter. 6. The method of claim 4 , wherein the reluctance machine is operated without an encoder. 7. The method of claim 4 , wherein the reluctance machine is operated with open-loop control. 8. The method of claim 4 , wherein the reluctance machine is monitored with a monitoring device configured to: rotate with a vector rotator the space phasor of the reluctance machine that depends on the voltage into a coordinate system that rotates with a negative fundamental frequency, filter the rotated space phasor with a low-pass filter and producing the output signal, and evaluate the output signal with a signal evaluation device to detect the DC value signal of the output signal.
Assignees
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Classifications
- H02P25/089Primary
Sensorless control (direct torque control H02P23/30) · CPC title
Arrangements for starting · CPC title
Estimation of position or speed · CPC title
- H02P21/05Primary
specially adapted for damping motor oscillations, e.g. for reducing hunting · CPC title
Flux estimation · CPC title
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- What does patent US11201575B2 cover?
- A monitoring device for a reluctance machine includes a vector rotator for rotating a space phasor of the reluctance machine that depends on a voltage in a coordinate system that rotates with a negative fundamental frequency, a low-pass filter filtering the rotated space phasor and producing an output signal, and a signal evaluation device evaluating the output signal. A DC value of the produce…
- Who is the assignee on this patent?
- Siemens Ag
- What technology area does this patent fall under?
- Primary CPC classification H02P25/089. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Dec 14 2021 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).