CWZ series eddy current dynamometer systemDetailed product description：

1 Overview
The CWZ series motor testing system is an automatic testing system composed of eddy current dynamometer, torque and speed sensor, controller, etc. This system can replace hydraulic dynamometer, DC generator set and other testing equipment, and is used for measuring torque, speed, power and testing the overall characteristics of power machinery such as ordinary three-phase asynchronous motors, variable frequency speed regulating three-phase asynchronous motors, diesel engines, gasoline engines, gearboxes, etc. It has become a necessary equipment for type testing. To meet the testing needs of different products, the system configuration may vary. For different project testing and data collection requirements, different configuration schemes can be selected to maximize the satisfaction of different user needs.
The system is equipped with CW type eddy current dynamometers of different specifications, which can be used for factory inspection, type testing, maintenance testing, etc. of small and medium-sized motors. This mainly introduces the loading test device for 15-1000KW motors. The same method can be used for testing motors below 15kW and 900kW-2200kW, and will not be described in detail. The control system uses a computer as the data processor, which can organize and print the test data. The braking power supply using an IGBT device as the load can have a wide adjustment range.
The entire system consists of a loading test bench and a detection control system, as shown in the figure. The test bench mainly consists of a torque speed sensor that detects the torque, torque, and speed of the electric motor, an eddy current brake (also known as a dynamometer) that loads the electric motor, and connecting machinery. To reduce the noise during system operation, the dynamometer adopts a water-cooled type, and larger testing systems should also have a water circulation system to reduce operating costs.

2 Main functions
2.1 The control system has manual and automatic loading and testing modes, which means that the load can be manually, fixed-point, or automatically adjusted. The test data is displayed on the microcomputer, and dynamic curves (including the unstable zone of asynchronous motors) can be automatically drawn, test reports can be generated, qualification judgments can be made, and test results can be saved automatically. The characteristic curves of different motors can also be compared within the same interface. When conducting temperature rise tests on electric motors, the operation and stop of the tested motor can be directly controlled by a microcomputer.
2.2 Adopting modular design, the system can combine different types of products according to users' different requirements. When the tested product has different parameter indicators and functions, it only needs to be replaced or tested through settings. A detection and control system can also be shared among multiple loading test benches to reduce costs.
2.3 Constant torque, constant power, or constant current control modes can be selected.
2.4 Main technical parameters of eddy current dynamometer Input speed (r/min) 200-3600 (3000) 200-5000 Rated torque (N.m) 5-14000 Absorbed power (kW) 0.75-2200 (i.e. power measurement range)
2.5 Torque and speed sensor: Adopting a brushless contact torque and speed sensor, it can be applied to a wide range of speeds. It can provide stable testing accuracy and ideal testing range, and its stable testing accuracy and reliable performance ensure the accuracy of the testing system. The rated torque and speed of the sensor can be configured according to system requirements, and its series specifications are complete, which can meet the needs of various products. The range of available specifications is as follows:
Rated torque (N.m) 0.2-30000
Rated speed (r/min) 0-20000
The sensor testing accuracy is divided into 0.1 level and 0.2 level, and its static calibration error is: static calibration error
0.1 level ≤± 0.1%,
Level 0.2 ≤ ± 0.2%.

CWZ series eddy current dynamometer system