Extended-speed low-ripple torque control of switched reluctance motor drives
US-9641119-B2 · May 2, 2017 · US
Control method for reducing torque ripple in switched reluctance motors
US9246429B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9246429-B2 |
| Application number | US-201414299116-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 9, 2014 |
| Priority date | Feb 20, 2014 |
| Publication date | Jan 26, 2016 |
| Grant date | Jan 26, 2016 |
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Abstract
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A method of controlling torque ripple in a switched reluctance motor (SRM) includes splitting each phase winding of the SRM into an AC winding and a DC winding. The AC winding of each phase winding is excited with symmetrically displaced sinusoidal currents that may be projected into a reference frame that moves synchronously with the SRM rotor.
First claim
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The invention claimed is: 1. A method of controlling torque ripple in a switched reluctance motor, the method comprising: splitting each phase winding of a switched reluctance motor (SRM) into an AC winding and a DC winding; exciting the AC winding of each phase winding with symmetrically displaced sinusoidal currents; exciting the DC winding of all phase windings with a varying DC current based on spatially varying magnetic properties of the SRM; and calculating the spatially varying magnetic properties of the SRM, wherein the spatially varying magnetic properties of the SRM are represented as f (δ)=1+ k 3 [sin(3δ+γ)+tan(γ)cos(3δ+γ)]+ k 6 [sin(6δ+γ)+tan(γ)cos(6δ+γ)], wherein δ is angular degrees (position), k 3 and k 6 are constants, and γ is a phase angle. 2. The method of controlling torque ripple in a switched reluctance motor according to claim 1 , wherein the varying DC current is represented as i o =√{square root over (3)} If (δ), wherein I is a nominal DC current. 3. The method of controlling torque ripple in a switched reluctance motor according to claim 1 , wherein exciting the AC winding of each phase winding with sinusoidal currents comprises projecting the phase currents into a reference frame that moves synchronously with the SRM rotor. 4. The method of controlling torque ripple in a switched reluctance motor according to claim 3 , further comprising calculating the spatially varying magnetic properties of the SRM, wherein the spatially varying magnetic properties of the SRM are represented as f (δ)=1+ k 3 [sin(3δ+γ)+tan(γ)cos(3δ+γ)]+ k 6 [sin(6δ+γ)+tan(γ)cos(6δ+γ)], wherein δ is angular degrees (position), k 3 and k 6 are constants, and γ is a phase angle. 5. The method of controlling torque ripple in a switched reluctance motor according to claim 4 , wherein the varying DC current is represented as i o =√{square root over (3)} If (δ), wherein I is a nominal DC current. 6. A method of controlling torque ripple in a switched reluctance motor, the method comprising: splitting each phase winding of a switched reluctance motor (SRM) into an AC winding and a DC winding; and exciting the AC winding of each phase winding with symmetrically displaced sinusoidal currents that are projected into a reference frame the moves synchronously with the SRM rotor, wherein the reference frame is based on spatially varying magnetic properties of the SRM. 7. The method of controlling torque ripple in a switched reluctance motor according to claim 6 , further comprising calculating the spatially varying magnetic properties of the SRM, wherein the spatially varying magnetic properties of the SRM are represented as f (δ)=1+ k 3 [sin(3δ+γ)+tan(γ)cos(3δ+γ)]+ k 6 [sin(6δ+γ)+tan(γ)cos(6δ+γ)], wherein δ is angular degrees (position), k 3 and k 6 are constants, and γ is a phase angle. 8. The method of controlling torque ripple in a switched reluctance motor according to claim 7 , further comprising exciting the DC winding of each phase winding with a varying DC current, wherein the varying DC current is represented as i o =√{square root over (3)} If (δ), wherein I is a nominal DC current. 9. A method of controlling torque ripple in a switched reluctance motor, the method comprising: splitting each phase winding of a switched reluctance motor (SRM) into an AC winding and a DC winding; exciting the DC winding of all phase windings with a varying DC current based on spatially varying magnetic properties of the SRM; exciting the AC winding of each phase winding with symmetrically displaced sinusoidal currents that vary in response to a rotor position; and calculating the spatially varying magnetic properties of the SRM, wherein the spatially varying magnetic properties of the SRM are represented as f (δ)=1+ k 3 [sin(3δ+γ)+tan(γ)cos(3δ+γ)]+ k 6 [sin(6δ+γ)+tan(γ)cos(6δ+γ)], wherein δ is angular degrees (position), k 3 and k 6 are constants, and γ is a phase angle. 10. The method of controlling torque ripple in a switched reluctance motor according to claim 9 , wherein the varying DC current is represented as i o =√{square root over (3)} If (δ), wherein I is a nominal DC current. 11. A method of controlling torque ripple in a switched reluctance motor, the method comprising: splitting each phase winding of a switched reluctance motor (SRM) into an AC winding and a DC winding; exciting the AC winding of each phase winding with symmetrically displaced sinusoidal currents; exciting the DC winding of all phase windings with a varying DC current based on spatially varying magnetic properties of the SRM, wherein exciting the AC winding of each phase winding with sinusoidal currents comprises projecting the phase currents into a reference frame that moves synchronously with the SRM rotor. 12. The method of controlling torque ripple in a switched reluctance motor of claim 11 , further comprising calculating the spatially varying magnetic properties of the SRM, wherein the spatially varying magnetic properties of the SRM are represented as f (δ)=1+ k 3 [sin(3δ+γ)+tan(γ)cos(3δ+γ)]+ k 6 [sin(6δ+γ)+tan(γ)cos(6δ+γ)], wherein δ is angular degrees (position), k 3 and k 6 are constants, and γ is a phase angle. 13. The method of controlling torque ripple in a switched reluctance motor of claim 12 , wherein the varying DC current is represented as i o =√{square root over (3)} If (δ), wherein I is a nominal DC current.
Assignees
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Classifications
- H02P25/088Primary
Electricity · mapped topic
- H02P25/098Primary
Arrangements for reducing torque ripple · CPC title
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- What does patent US9246429B2 cover?
- A method of controlling torque ripple in a switched reluctance motor (SRM) includes splitting each phase winding of the SRM into an AC winding and a DC winding. The AC winding of each phase winding is excited with symmetrically displaced sinusoidal currents that may be projected into a reference frame that moves synchronously with the SRM rotor.
- Who is the assignee on this patent?
- Gen Electric
- What technology area does this patent fall under?
- Primary CPC classification H02P25/088. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jan 26 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 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).