Power supply for AC motor evaluation

Power supply for evaluation of three-phase motor characteristics

Here are some examples of the 3-phase AC motors applications.

In the example presented here, instead of an inverter, a high-capacity smart AC/DC regulated power supply PCR-WEA/WEA2 series is used to run the motor.

Motors used in EVs and PHVs are mainly three-phase synchronous motors. To properly run the motors, a controller is required. In this case, the PCR-WEA/WEA2 series is a simulation inverter that operates precisely according to the controller’s commands.

Power supply for evaluation of three-phase motor characteristics
Three-phase motor characteristics evaluation

PCR-WEA/WEA2 series can be used to evaluate the three-phase motor characteristics. Since it generates clean three-phase AC waveforms, the PCR-WEA/WEA2 series can replace a PWM inverter by inputting voltage analog signals from the motor’s driver.
It is recommended for acquiring basic motor characteristics, not including PWM inverter characteristics.

Low-distortion AC waveform

The key feature is
Low-distortion AC waveform

Here are the advantages of using the PCR-WEA/WEA2 series:

The first one is a wide frequency bandwidth of up to 5 kHz, enough to drive a 20,000 rpm high-speed motor.

The second one is low distortion and low noise. The device can supply clean waveforms that make the original motor characteristics verification possible.

The third one is the arbitrary waveform function, which can also be used to reproduce the inverter waveforms used in vehicles. The PCR-WEA/WEA2 series has a very high carrier frequency and can accurately recreate even quite noisy waveforms.

Three-phase generator characteristics evaluation

This is an example of handling the back EMF and regenerative power a generator motor produces.

The PCR-WEA/WEA2 series is equipped with a power regeneration function as standard. The regenerative power of 100% of the power supply capacity can be continuously supplied for an unlimited period of time.

Therefore, the regenerative power generated during braking can be safely received.

Three-phase generator characteristics evaluation
Pseudo resistive load

Thanks to the standard output impedance setting function, this power supply can be used as a pseudo-resistive load. When used as a pseudo-resistive load, the set voltage should be lower than the generator’s voltage.
A current proportional to the set impedance value is supplied, and power can be regenerated.

Experimental waveforms [Reference]

Here are some useful tips.

The power supply’s output impedance function can be used for regenerative operation. The key is to set the power supply voltage lower than the motor output voltage.

When this function is on, the system can work as a power regeneration simulation load during continuous operation. This reduces energy consumption and contributes to CO2 emission reduction. Also, since the system supports AC and DC voltage, it can be used for various applications.

Experimental waveforms
Voltage change causes current to flow.

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