During the development of the electric power train for electric vehicles, voltage and current characteristics at the AC phases of the electric motors must be recorded and analyzed. The HV Breakout Modules are particularly suitable for this purpose, as they measure required values extremely quickly, synchronously and precisely.
The synchronous and fast measurement of currents and voltages in all phases of an electric motor is the basis for the exact calculation of the electrical power or the determination of the efficiency. From the sampled values, the active, apparent and blind power is calculated with the eMobilityAnalyzer, a package which is included in the Vector software vMeasure or CANape.
Current and voltage measurement for power calculation.
In this example, the voltages and currents of each phase of a three-phase synchronous motor with a rated power of 43 kW are to be measured. Different load situations are simulated in the test bench by varying the speed and the torque. The high basic frequency of the inverter of 24 kHz (41.6 µs) requires a time resolution of the measured values in the microsecond range in order to also record short voltage pulses at low load. The 480 V battery voltage used also requires special safety measures for the measurement modules.
The HV Brekaout modules, with their high-voltage safe galvanically isolated inputs, ensure safety even at high voltages and meet the requirement for high time resolution of the measurement. With the synchronization of the measurement data and high measurement data rate, the current and voltage characteristics can be examined precisely. In this way, models created during development can be compared with the values actually measured and further optimizations can be made.
When using vMeasure, additional variables, e.g. power, can also be analyzed in real-time with the eMobilityAnalyzer.
XCP-Gateway is the interface between the data acquisition software (e. g. vMeasure, CANape®, INCA®, Vision® ...) and the EtherCAT® measurement modules from CSM. It includes an EtherCAT® master and an XCP-on-Ethernet slave.
The HV Breakout Modules (BM) Type 1.2 have been specially designed for safe and precise single-phase measurement in separated HV+ and HV- power cables. Inner conductor current and voltage are measured directly and the instantaneous power is calculated in the module.
The HV Breakout Module (BM) type 1.1 has been specially designed for safe and precise single-phase measurement in single HV voltage power cables. Inner conductor current and voltage are measured directly and the instantaneous power is calculated in the module.
Swift configuration of measurement chains: CSMconfig is the reliable configuration software for all CAN and EtherCAT® based measurement modules from CSM. The clearly arranged and easy-to-use user interface allows an easy setting of all measurement parameters. This helps speeding up the measurement setup considerably.
vMeasure, developed by Vector Informatik, is an easy-to-use software tool for the acquisition and analysis of measurement data that can be used in combination with all CAN- and EtherCAT®-based CSM measurement modules. CSMconfig was integrated directly to ensure swift configuration.