The support asynchronous motor driven air compressor, EM303B standard product driven air compressor to secondary energy efficiency standards, close to the level of energy efficiency standards, can obtain government subsidy 100 yuan /kW.

The support for the permanent magnet synchronous motor open loop control of air compressor, EM303B screw air compressor special software, drive air compressor to reach the level of energy efficiency standards, can obtain government subsidy 200 yuan /kW.

Permanent magnet synchronous control technology of the sine screw air compressor:

①.The initial position of self identification: initial position identification method of PMSM rotor high frequency injection, ensure that the starting without inversion.
②.The motor parameters self-learning: inverter self-learning function to obtain the parameters of the motor Rs, Ld, Lq, Ef.
③.The PG vector control: PMSM implementation of vector control in the encoder mounting conditions, reduce costs and improve reliability.
④.The small no-load current, high power factor: the no-load current is close to zero, the power factor close to 1.

At the time of the process of adding / unloading 100% load, the estimated speed (yellow) and current waveform (red)

0.1 seconds full load plus deceleration, positive and negative rated speed switch, the estimated speed (yellow) and current waveform (red)
 

0 seconds without load and deceleration, positive and negative rated speed switch, bus voltage (blue), the estimated speed (yellow) and current waveform (red)