Method and apparatus for controlling power converter with inverter output filter
US-2015123579-A1 · May 7, 2015 · US
Rotor position estimation apparatus and methods
US9774284B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9774284-B2 |
| Application number | US-201514625860-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 19, 2015 |
| Priority date | Feb 19, 2015 |
| Publication date | Sep 26, 2017 |
| Grant date | Sep 26, 2017 |
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Abstract
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Motor drives, methods and estimation systems are presented for estimating a rotor position of a motor load in which four sets of inverter output current samples obtained at four different sample times in a given inverter PWM cycle are converted into a corresponding stationary reference frame current value pairs, and the rotor position estimate is computed according to the stationary reference frame current values.
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The following is claimed: 1. An estimation system for estimating a rotor position of a motor load driven by an inverter, wherein the estimation system: converts each of four sets of multiphase inverter output current samples obtained at four different sample times in a given inverter pulse width modulation cycle into a corresponding pair of stationary reference frame current values, the given inverter pulse width modulation cycle having a duration equal to a complete cycle of a carrier waveform used in generating pulse width modulated switching signals to control an output of the inverter, and computes an estimated rotor position for the given inverter pulse width modulation cycle according to the stationary reference frame current values for the given inverter pulse width modulation cycle; wherein the four sets of multiphase inverter output current samples are sampled by the estimation system approximately at peaks, valleys and mid-points of one of a plurality of phase shifted carriers used to operate the inverter in the given inverter pulse width modulation cycle wherein a control circuit implements closed loop control of the inverter to control operation of the motor load at least partially according to the estimated rotor position. 2. The estimation system of claim 1 , wherein the four sets of multiphase inverter output current samples are sampled approximately at 90° intervals in the given inverter pulse width modulation cycle. 3. The estimation system of claim 1 , wherein the estimation system: computes the estimated rotor position θ for the given inverter pulse width modulation cycle according to α-β stationary reference frame current value pairs i αi and i βi for the four sample times (t 1 , t 2 , t 3 and t 4 ) according to the following equation: θ = 0.5 tan - 1 ( u ( 1 ) u ( 2 ) ) , where : u ( 1 ) = - ( i α 2 + i β 1 ) , u ( 2 ) = i β 2 - i α 1 , i α1 = i α ( t 1 ) - i α ( t 3 ) , i β 1 = i β ( t 1 )
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- What does patent US9774284B2 cover?
- Motor drives, methods and estimation systems are presented for estimating a rotor position of a motor load in which four sets of inverter output current samples obtained at four different sample times in a given inverter PWM cycle are converted into a corresponding stationary reference frame current value pairs, and the rotor position estimate is computed according to the stationary reference f…
- Who is the assignee on this patent?
- Rockwell Automation Tech Inc
- What technology area does this patent fall under?
- Primary CPC classification H02P6/18. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Sep 26 2017 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).