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UM-YROTATE-IT-RX62T 数据表(PDF) 21 Page - Renesas Technology Corp |
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UM-YROTATE-IT-RX62T 数据表(HTML) 21 Page - Renesas Technology Corp |
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21 / 54 page ![]() RX62T YROTATE-IT-RX62T Motor Control Kit UM-YROTATE-IT-RX62T Rev.1.00 Page 21 of 51 Jan 15, 2014 dt d i R v dt d i R v S S β β β α α α λ λ + = + = These equations show that magnetic flux can be obtained from applied voltages and measured currents simply by integration: d i R v dt i R v S t S t ) ( ) ( 0 0 0 0 β β β β α α α α λ λ λ λ ∫ ∫ − + = − + = Furthermore: β β α α λ ϑ λ ϑ Li Li m m − = Λ − = Λ ) sin( ) cos( If the synchronous inductance L is small, the current terms can be neglected, if not they have to be considered. In general: β β β β β β α α α α α α λ λ ϑ λ λ ϑ Li dt i R v Li y Li dt i R v Li x S t m S t m − − + = − = Λ = − − + = − = Λ = ∫ ∫ ) ( ) sin( ) ( ) cos( 0 0 0 0 So in the ( α,β) system phase we obtain from the flux components: ) arctan( y x = ϑ The system speed ω can be obtained as the derivative of the angle ϑ. ) (t dt d ϑ ω = Based on this, a sensorless control algorithm was developed to give the imposed phase voltages, to measure phase currents, to estimate the angular position ϑ and finally the system speed. |
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