The exceptional ±0.03% measurement accuracy of the Yokogawa WT5000 precision power analyser - in combination with its stability, noise immunity and plug-in modular flexibility - meets the measurement needs of today’s EV engineers. With the WT5000 it becomes possible to capture accurate waveforms from the latest EV high-speed/traction inverter devices and achieve stable measurement results.
In short, users of the WT5000 can leverage its world-leading accuracy to evaluate the power consumption, loss and efficiency of common EV electrical and electronic devices. In particular, the instrument’s wide dynamic current range is indispensable for energy-efficiency tests.
The WT5000 incorporates up to seven input channels, allowing it to support measurement applications that would previously require the synchronisation of several separate instruments. As a result, the precision power analyser offers considerable savings in installation space, communications overheads and cost-effectiveness.
Further benefits result from the use of plug-in modular input elements, which the user can swap according to requirements. For example, engineers can switch the 30 A and 5 A elements for applications involving EVs or fuel-cell vehicles, where a growing need exists to evaluate a number of different motors. Dedicated options facilitate the evaluation of up to four motors simultaneously with a single unit. Since these options allow the input of four channels, engineers can flexibly measure the A, B, C and Z phases of each motor.
Notably, the WT5000 can carry out two harmonic measurement functions simultaneously, each up to the 500th order and up to 300 kHz fundamental waveform. Engineers are thus able to measure the carrier frequency component from the rotational speed of the motor in the inverter drive and check the influence of the carrier frequency on the motor drive.
Evaluating certain larger-current EV devices requires external current sensors. An external current sensor input function is fitted as standard in the 30 A and 5 A input elements of the WT5000. In fact, the WT5000 features a new current sensor element that improves noise immunity and runs off the analyser’s internal DC power supply, making external power supplies unnecessary. This simplifies measurement set-up as the only items required are the current sensor and a connecting cable.
For wide-bandwidth, high-current applications in the automotive industry, Yokogawa Test & Measurement recommends its CT1000S AC/DC split-core current sensor. The CT1000S combines the accuracy of Yokogawa’s conventional current sensors with the convenience of a clamp design (no wire disconnection required). It also features a high common mode rejection ratio (CMRR) and excellent frequency characteristics. The CT1000S is able to measure AC and DC currents of up to 1000 A and has a wide DC to 300 kHz measurement frequency range. For EV tasks such as the evaluation of inverter carrier fundamental frequency components - and reactor losses that necessitate wide bandwidths and the measurement of large currents - the CT1000S is the ideal companion for the WT5000 precision power analyser.
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