Explosion-proof frequency conversion speed control device is generally used in the environment where coal mine has coal dust, biogas and explosion hazard, and it is used as the frequency conversion speed switch of belt asynchronous conveyor driven AC asynchronous motor. The device adopts vector control technology and current loop and speed loop control to ensure that the inverter can output a large torque at low frequency operation. It can achieve 1.7 times of starting torque at 1 Hz, and the maximum torque is rated torque. More than twice, it can guarantee the smooth delay start under the heavy load condition of the belt conveyor. The delay time can be adjusted arbitrarily according to the working conditions of the field. It can also be tested under the low frequency operation state. The inspection time can also be set on site. set.
Low speed inspection can be achieved under inspection. The internal power components of the inverter are all imported devices, and the external heat dissipation adopts self-cooling method, making it a maintenance-free device. Flexible use method, when the motor power is less than 100kW, the two motors should be driven by the inverter.
As the soft start device of the conveyor, the optional voltage slope, constant current or optimized “s†curve start should be provided according to the dynamic characteristics of the conveyor, and the starting acceleration and starting current can be controlled to meet the requirements of heavy load starting. Effectively suppresses dynamic tension waves from extremely harmful propagation.