Method and system for sensorless control of an electric motor
US-9106177-B2 · Aug 11, 2015 · US
Sensorless control method and system for motor
US9407182B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9407182-B2 |
| Application number | US-201414557277-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 1, 2014 |
| Priority date | Oct 1, 2014 |
| Publication date | Aug 2, 2016 |
| Grant date | Aug 2, 2016 |
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Abstract
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A sensorless control method and system for a motor are provided. The includes a back EMF observer that is configured to estimate a back EMF of the motor and an angle error calculator that is configured to calculate an electrical angle error considering iron loss of the motor based on the back EMF estimated by the back EMF observer. An angle error compensator is configured to compensate the electrical angle error calculated by the angle error calculator. An electrical angle for compensating the calculated electrical angle error is obtained through simulation or experiment for the motor. In addition, a PLL controller is configured to receive the compensated electrical angle to estimate an actual angle by reducing the electrical angle error due to the iron loss, and to operate the motor based on the estimated actual angle.
First claim
Opening claim text (preview).
What is claimed is: 1. A sensorless control system controlling a motor having a permanent magnet motor, comprising: a back EMF observer configured to estimate a back EMF of the motor; an angle error calculator configured to calculate an electrical angle error considering iron loss of the motor based on the back EMF estimated by the back EMF observer; an angle error compensator configured to compensate the electrical angle error calculated by the angle error calculator, wherein an electrical angle for compensating the calculated electrical angle error is obtained through simulation or experiment for the motor; and a PLL controller configured to receive the compensated electrical angle to estimate an actual angle by reducing the electrical angle error due to the iron loss, and operate the motor based on the estimated actual angle. 2. The sensorless control system of claim 1 , wherein voltages (ν γ , ν δ ) of the motor associated with the electrical angle error (ζ) considering the iron loss are calculated by the following equation: [ v γ v δ ] = [ R s + pL d - ω e L q ω e L q R s + pL d ] [ i γ i δ ] + [ - A 2 + B 2 sin ( Δθ + ζ ) A 2 + B 2 cos ( Δθ + ζ ) ] ζ = tan - 1 ( B A ) A = E ex + ω e 2 L d
Assignees
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Classifications
- H02P6/182Primary
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- What does patent US9407182B2 cover?
- A sensorless control method and system for a motor are provided. The includes a back EMF observer that is configured to estimate a back EMF of the motor and an angle error calculator that is configured to calculate an electrical angle error considering iron loss of the motor based on the back EMF estimated by the back EMF observer. An angle error compensator is configured to compensate the elec…
- Who is the assignee on this patent?
- Hyundai Motor Co Ltd, Postech Academy-Industry Found
- What technology area does this patent fall under?
- Primary CPC classification H02P6/182. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Aug 02 2016 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 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).