Design And Study Of Elevator Special PMSM Inverter

Elevator special inverter occurs along with the increases of buildings. It satisfies the demand of electric power drag system used in high performance elevators. At the same time, permanent magnetic synchronous motor (PMSM) becomes the mainstream of new elevator drag system for its advantages such as simply torque control, small bulk and high efficiency. A suit of elevator special inverter experimental platform is designed based on lucubrating in corresponding theories.Mathematical model of PMSM is analyzed with vector control principle of motor, and then the frequency conversion motor control system model is built in Matlab based on space vector pulse width modulation (SVPWM).Generalized predictive control (GPC) is applied in current circuit to form predictive- PI (PPI) adjuster. GPC has the characters of roll optimization and feedback revise, so it can overcome the effect of lag time arose from sensor measurement, arithmetic running and so on. PPI combines the merits of GPC and PI. It is easy to build simulation model with simply arithmetic and high reliability. Simulation results indicate that the performance of PPI is better than PI with appropriate parameters. Sensorless control strategy is studied on the basis of sliding mode variable structure (SMVS) observer. First measure the phase currents which are transformed under theα-βcoordinates, then design the SMVS observer based on the motor's electromagnetic equations to estimate the rotor's velocity and position. Theoretical analyses and simulation results indicate that the method has better following quality during the startup, faster constringency of velocity estimation and better ability on resisting the disturbances of load, so it can improve the robustness of the system.Dead-time is compensated according to the output reference voltage vector and phase currents. First acquire dead-band voltage by judging the currents'direction, and then confirm the phase to be compensated due to the given reference voltage vector. Simulation results prove that it can compensate torque and current excellently.The elevator special inverter is designed with the core of motor control DSP TMS320LF2407A, combining related hardware.