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1、 2013 Microchip Technology Incorporated. All Rights Reserved. 17106 FOCSlide 1PMSM Operation90 - Back EMFbcaPosition 2013 Microchip Technology Incorporated. All Rights Reserved. 17106 FOCSlide 2N SSNSNNSSNMotor StartuplEnergize the stator to known positionlHold stator on for a lock timelRamp up RPMs

2、lHold at starting speedlCurrent measurement disabledlNo control loops? 2013 Microchip Technology Incorporated. All Rights Reserved. 17106 FOCSlide 3Signal ProcessingacIaIcIbisb3-Phase Coordinate System(Stator current space representation) 2013 Microchip Technology Incorporated. All Rights Reserved.

3、17106 FOCSlide 4Clarke TransformacIaIcIbisb3-Phase Coordinate System(Stator current space vector representation)isIINew 2-Phase Coordinate System(same is space vector for Stator current) 2013 Microchip Technology Incorporated. All Rights Reserved. 17106 FOCSlide 5Clarke TransformationProjected Onto

4、2-Phase System (Clarke Transformation) 2013 Microchip Technology Incorporated. All Rights Reserved. 17106 FOCSlide 6Change of reference frame 2013 Microchip Technology Incorporated. All Rights Reserved. 17106 FOCSlide 7Id = i cos + i sinIq = -i sin + i cosIqIdiiParkTransform 2013 Microchip Technolog

5、y Incorporated. All Rights Reserved. 17106 FOCSlide 8Park TransformisII2-Phase Coordinate System(referenced to Stator)dqProjected Onto Rotating System (referenced to Rotor)Transformation from stationary to a rotating reference frame. Direct-axis and Quadrature-axis stator current representation 2013

6、 Microchip Technology Incorporated. All Rights Reserved. 17106 FOCSlide 9Park TransformationTransformation from stationary to a rotating reference frame (turned at the rotor speed)Projected Onto Rotating System 2013 Microchip Technology Incorporated. All Rights Reserved. 17106 FOCSlide 10Park Transf

7、ormationVectors in the Rotating Reference Framedq 2013 Microchip Technology Incorporated. All Rights Reserved. 17106 FOCSlide 11Signal Processinga ab babc3-Axis Static Reference(STATOR)2-Axis Static Reference(STATOR)dq2 -Axis Rotating Reference(ROTOR)Vector-Coordinate SystemsClarkeTransformParkTransform 2013 Microchip Technology Incorporated. All Rights Reserved. 17106 FOCSlide 12

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