4. System grinding machine start and speed adjustment: The grinding wheel of the main grinding wheel of the grinding machine adopts a star-delta conversion starting circuit. Replace the original circuit with the inverter, and use the normal contactor of the original contactor to control the running of the inverter. Consider the inertia of the grinding wheel to start the grinding machine. The soft start time of the inverter is set to 10S, and the stop braking time is set to 15S. The grinding wheel starting torque of the type grinder can be adjusted between 50% and 80%. The system speed is adjusted by the external adjustable potentiometer, and the grinding machine adapts to the speed adjustment according to the diameter of the workpiece. The motor is limited by the mechanical strength/noise/vibration of the grinding machine at high speed. The maximum frequency of the motor is set to 60HZ; the motor is cooled due to the low speed. The effect is poor. Consider the actual maximum workpiece size of the workpiece rotating grinder. The lowest frequency is set to 35HZ and the reference frequency is set to 50HZ. From the analysis of the load characteristics of the front grinder, it can be known that the high speed section has a constant power property, the low speed section has a constant torque property, and the load requires a large torque at a low speed and a strong overload capability. Above the motor reference frequency, in order to ensure that the motor is not under pressure, constant voltage frequency control is adopted. According to the motor theory, when the voltage is constant and the frequency is increased, the magnetic flux of the grinding machine at each pole of the motor decreases with the increase of the frequency grinder; when the motor current is the rated current, the maximum allowable output torque is reduced, and the allowable output is obtained. Constant power, constant power speed regulation, suitable for constant power loads. Below the fundamental frequency, in order to ensure that the magnetic flux at each pole of the motor is constant, the V/F=constant grinding machine is used to change the frequency conversion speed regulation. When the current of the motor grinding machine is the rated current, the allowable output torque of the motor is constant, which belongs to the constant torque adjustment. Speed, suitable for constant torque loads. However, when the speed is low, the internal resistance of the motor can not be neglected. If the V/F is kept constant, the motor torque will be reduced, and the load of the grinding machine with high load at the low speed cannot be satisfied, and the performance of the grinding machine with strong overload capability is adopted. The grinder torque automatic compensation function is selected to correct the grinder V/F curve after compensation. 5. System design grinder precautions: The grinding wheel balance grinding machine should be improved in accuracy: the motor should be operated at the rated speed. In order to reduce the vibration of the grinding machine at high speed, the dynamic balance of the motor grinding wheel grinding machine should be improved and corrected. Low-speed grinding machine heat dissipation: Because the motor is self-cooling fan cooling, the heat dissipation condition is worse at low speed, and the load torque is larger, the motor temperature will increase, so the minimum speed grinder is set to the motor surface temperature difference does not exceed the allowable value. in accordance with. In the frequency conversion speed regulation, the inverter output contains high-order harmonics, and the motor will generate electromagnetic noise. Therefore, a zero-phase noise filter should be installed at the output end to reduce the auxiliary radiation interference and the induction noise. The inverter grinding machine parameter setting item is important to lock the functions of reverse/high frequency/stall! Expanding Adapter Stem Casters Caster Wheels,Casters,Wheels Heavy Duty Plate Casters,Medium Duty Plate Casters Co., Ltd. , http://www.chheavydutycaster.com Previous page 1 2 Next page