The content economy during electromechanical slot machine converter repair when the main tool the auxiliary maintenance equipment in addition to the common multimeter, oscilloscope, logic analyzer, signal generator, the most important is inseparable from the engineers maintenance experience. A common slot machine Inverter repairs characteristics: the inverter voltage space vector / SVPWM based on three-phase waveform overall innate effect conditions for the purpose of forced Pro motor air gap ideal circular rotating field track, and once born three-phase modulation waveform, within to cut polygon forced Pro-round control. Then improved by practice use, that is, the introduction of the frequency compensation can eliminate the error of speed control; estimation of the magnitude of the flux through feedback to eliminate the impact of low speed stator resistance; the output voltage, current, closed-loop, advances in dynamic accuracy and not arbitrary degree. Second, slotting machine inverter the maintenance control the way: 1, constant torque characteristics: general purpose use curves, straight running conveyor belt, and speed-independent constant torque use spaces; 2, decreasing torque characteristics: as fans, pumps load occasions, the speed was 2 power relations, the use of such curves;, high starting torque: the wiring between the inverter and the motor a longer interval (about 100m), the output torque requirements startup (lift load ) in the input or output of the inverter AC reactor is inserted, with the motor running less than the maximum combined motor; 4, constant output power operation: the curve of its run at frequencies above 50Hz, 50Hz constant voltage. Yung economic electromechanical slot machine the converter repair business is built on the basis of mutual trust with our customers, and strive for technical excellence, and has always been safe and reliable products for the repair is completed. Yung economic converter repair customers reliable choice.