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E-drive testing system

With 51 data acquisition channels and CAN connectivity

The eDrive test system by HBM is suitable for electric motors and inverters. It can be integrated into Ethercat-based environments.

The eDrive test system provides a CAN interface, in order to acquire data from the in-vehicle network (Photo: HBM)

The test system comprises two parts: the data acquisition system (DAQ) and the power analyzer. The DAQ collects data from the vehicle’s CAN network (e.g. speed, torque, temperature) and the discrete I/O channels measuring vibration and other variables. The power analyzer measures and calculates electrical signals and power in real-time on up to 51 channels, as well as mechanical power with up to 6 torque/speed signals and a typical power accuracy of 0,02 percent.

“HBM’s eDrive package is a completely integrated test solution that allows engineers to record, verify and study both electrical and mechanical parameters under dynamic conditions,” said Mike Hoyer from HBM. The test system combines the company’s T12 or T40 torque sensor, the GEN3i data acquisition system, and as an option the Quantum 1609B temperature satellite. In addition to making temperature, torque, and rotational measurements, the eDrive testing solution can make measurements from as many as 18 current and voltage channels at voltages up to 1,000 V, at a sampling rate of up to 2 Msample/s. The mechanical torque and rotational signals are recorded by the use of a rotating torque sensor with an integral slotted disc for speed sensing.

For noise immunity, optional high voltage 2-wire shielded cables with safety banana connectors are provided in various lengths ensuring improved signal integrity. For additional safety from high voltages and currents, an optical Ethernet interface offers complete display and control from a remote location or control room via an external PC.

The system not only provides the raw data, but real-time analysis as well. Included with the system is powerful software that provides a complete characterization of an electrical drive train. The software analyzes the raw data and displays real time results, such as true, reactive and apparent power and efficiency calculations. It also allows for more extensive verification and analysis of the corresponding raw data. A freely programmable formula database can be used to determine equivalent circuit diagrams, calculate air gap or cogging torques for motor analysis plus calculation for space vector, part transformation and THD to analyze inverter behavior.


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