Tham khảo tài liệu 'electric vehicles modelling and simulations part 16', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Extended Simulation of an Embedded Brushless Motor Drive BLMD System for Adjustable Speed Control Inclusive of a Novel Impedance Angle Compensation Technique. 439 responsible for overshoot ATep accompanied by a corresponding reduction in settling time as shown in Figure 11. Theoretical consideration of motor accelerative dynamical performance The reduction in settling time is paralleled by the shaft velocity response time improvement in reaching rated motor speed. It is evident from inspection of the velocity and torque simulation traces that a direct correlation exists between the EM torque settling time and motor shaft velocity response time as indicated in Table I. Torque Load T 5Nm Inertial Time Constant Tm Jm Bm Tran. Gain Kr Torq-Dem h Volts Av. Peak EM Torq Tep Nm Torque Overshoot Tep -Tl Nm Torq. Settling Time Tsetl sec Figs. 8 9 Shaft Velocity Rise Time Tres sec Figs. 6 7 Theoretical Rise Time Tr sec Eqn. IV Rise Time T 1 a sec via Dyn-Fac. Eqn VI 5 6 7 8 9 Table I. Correlation of EM Torque Settling Time with Shaft Velocity Response Time The shaft velocity step response rise time as defined in Figure 6 can be obtained directly from the solution of the transfer function XCIX from the previous chapter in the time 440 Electric Vehicles - Modelling and Simulations domain with a step input approximation for the average peak torque overshoot Are rep -h in Figure 8 as rnr t 4 1 - e-t m Bm II with time constant m J mlBm III The step response time for the shaft velocity under load conditions to reach maximum speed cormax can be determined from II for different torque demand i p and corresponding peak torque values as per the above Table I with T 1 r T ln --------- lm lnl r -Bm rmax IV The estimated rise times are in excellent agreement with the approximate settling and response .
