Static Variable Frequency Power Supply System for Motor Test

The 380V/690V series of static variable frequency power supplies for electric motor testing is the serialized products of variable frequency power supply developed by our company specially faced with the type tests for electromotors and electric generators and predelivery tests, which is broadly used in all kinds of tests of asynchronous motors, variable frequency motors, synchronous motors and permanent magnet synchronous motors. The products of this series adopt the AFE four-quadrant rectification, common DC buses, multi-level inverter double line contravariant and combined sine filter technique, which can not only provide high-quality variable frequency power supply for all kinds of electrical motor tests including 380V, 690V (including 690V) directly, but can also provide high-quality variable frequency power supply for all kinds of electrical motor tests including 1140V, 3000V, 6000V and 10000V through the output transformer. For many years, with the support of vast customers, the 380V/690V series standardized static variable frequency power supplies for electric motor testing of our company obtained the reputations from customers with the mature technology, advanced property, complete functions, good quality, compact structure, low price, convenient use and good service, etc., and have been broadly used in many fields including type tests of all kinds of electromotors and electric generators, predelivery tests and electrical machinery research and development. 

The products of 380V/690V series of static variable frequency power supplies for electric machine testing, adopt the AFE four-quadrant rectification technical scheme on their rectifier circuits, and significantly reduce the harmonic content of the input current on the grid side. This allows the common DC bus voltage to be strictly controlled according to the given voltage of the system, it is not affected by the voltage fluctuation at the power grid side and the change in the load at the contravariant exit side, and provides steady DC voltage source for the contravariant output. The output of this series of products adopt output scheme of double three phase PWM inverter with identical structure parameters. Considering the demands of electrical motor tests, it can conduct the unit operation tests as well as the two-shipper driving power assessment. When conducting single motor tests, a set of inverter can be used to connect to the power grid as the input rectification, and the other set of inverter is connected to the tested motor, the power flow is from the power grid to the motor, and all the powers consumed by the motor are from the power grid side. When conducting motor load tests, a set of inverter can be connected to the tested motor, and the other set of inverter is connected to an accompanying motor with the same power, the mechanicals of the 2 motors are connected to the same axis, the tested motor is operated by a set of inverter through driving force, the accompanying motor is operated by the electricity dragged by the tested motor, the inverter connected with the accompanying motor is under the rectification condition, at this time, the power flow is going in a ring between the tested and accompanying motors, the little power through AFE at the power grid side is simply used to supplement the “consumption” of the 2 groups of inverters and the 2 motors, then the power assessment test of motors will hardly absorb power from the power grid, the micro power dissipation of the motor load test is realized. In addition, there is a sine wave filter set at the inverter of both two set of 3-phase PWM, in order to guarantee the output voltage and current index can sufficiently meet the national standard and requirement of the motor tests, and the sine filter function can be cancelled by the contractor in order to facilitate the tests of variable frequency motor.

Environmental conditions

Main technical specifications