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AN-1090 Datasheet(PDF) 4 Page - International Rectifier |
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AN-1090 Datasheet(HTML) 4 Page - International Rectifier |
4 / 15 page 15 www.irf.com 4 AN-1090 Based on the pole-zero cancellation technique, the controller gains are evaluated by: B A gBW Re Current L K q plreg ⋅ ⋅ = B A T 2 gBW Re Current R K 5 xlreg ⋅ ⋅ ⋅ ⋅ = Where A and B are the internal digital controller scaling (A*B = .006016) and T is the controller sampling time introduced for sampling compensation. The following gain calculation illustrates a drive application setup with Parameter configurator entries shown below: The current regulator gains are calculated as: 9973 006016 . 0 1500 04 . 0 K plreg = ⋅ = 9973 006016 . 0 1500 04 . 0 K D _ plreg = ⋅ = 4867 006016 . 0 0001 . 0 2 1500 1 . 6 K 5 xlreg = ⋅ ⋅ ⋅ = The current controller in the Sensorless FOC block module directly uses these gains. MCE designer provides current loop diagnostic test function. This test provides the response of the current control loop and also the steady state accuracy. |
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