Elektrische Automatisierungs- und Antriebstechnik
EAAT GmbH Chemnitz

Test inverter PWR
The inverter especially for testing a wide variety of electric motors

The test inverters of the PWR series from EAAT are inverters that have been specially developed for testing electric motors in a wide variety of power classes as well as current and voltage levels.

For example, the test inverter PWR-100 is an inverter specially designed for testing electric motors in the low voltage range. Typical areas of application are e.g. the testing of servomotors in the automotive sector, of motors for battery-operated tools or of motors in medical technology.

The inverter can be used both during development and production. This includes, for example, applications such as the implementation of endurance and temperature-rise tests, the recording of characteristic fields and the end-of-line test. It consists i.a. the possibility of parameter identification with connected electric motors. This includes the determination of winding resistance, phase inductance, EMF, etc. These data are available to the user via a digital interface for further processing.

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Test inverter PWR-100

Advantages of the test inverter PWR-100 from EAAT

The test inverter PWR-100 works with the latest MOSFET technology and is therefore suitable for testing motors with a voltage from 2 V. Thanks to short dead times and a PWM frequency of up to 40 kHz, high output frequencies of up to 2,000 Hz can be achieved.

The integration of numerous interfaces and control algorithms make it possible to test a wide variety of motor types, such as BLDC, PSM, ASM, GSM, 1-phase AC machines and 3-phase reluctance motors possible.


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Johnson Electric
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imx Solutions GmbH
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Qingdao AIP Intelligent Instrument Co., Ltd.

Technical specifications

Supply voltage (control) 15 to 36VDC
DC link voltage 2 to 100 VDC, at maximum ±60 V with respect to PE
Output voltage up to 3 x 65 V (effective) (depending on intermediate circuit voltage)
Output current 150 A (rms) (UZK: 24 VDC; without pre-charging circuit)
100 A (rms) (UZK: 24 VDC; with pre-charging circuit)
80 A (rms) (UZK: 48 VDC)
50 A (rms) (UZK: 100 VDC)
Output frequency 0 ... 2,000 Hz
PWM frequency 1 to 40 kHz (configurable)
Commutation space vector modulation, sine, block, trapezoid (optional)
Operating modes for motors FOC, sensorless, V/f control
Control algorithms Voltage control, current control, speed control, speed control with subordinate current control, torque control, position control
Efficiency >90 % (at 100 VDC, 20 A, 20 kHz PWM frequency)
Current measurement 3 motor strands + DC link, resolution 16 bits, ±1%
Voltage measurement 3 motor connections + DC link, resolution 16 bits, ±1%
Monitoring functions Short-circuit, overcurrent, overvoltage (DC link), undervoltage (DC link, gate driver), overtemperature
Controllable motors permanent magnet synchronous motors (PSM), brushless direct current motors (BLDC), asynchronous motors (ASM), direct current motors (DC), 1-phase alternating current motors, 3-phase reluctance motors
Interfaces (Sensor)
Absolute and incremental position sensors, resolvers, Hall sensors, Sin/Cos encoders, SSI, EnDat
Interfaces communication CAN, USB (optional), RS485
Other interfaces Digital IOs for release, reset, status, etc.
Analog IOs (±10 V)
PTC for motor temperature
Cooling PWR-100-S: Cooling plate for heat sink attachment
PWR-100-C: Forced air cooling
Protection class IP20
Ambient condition 0 bis 40 °C
rel. Humidity < 90%, without condensation
Test functions currents Iq and Id adjustable (parameter or analogue input)
Parameter identification (resistance, inductance, EMF, etc.)
Integrated oscilloscope
Generation of currents and voltages containing harmonics
Dimensions (W x H x D), Weight PWR-100-C: 212 mm x 300 mm x 310 mm, approx. 15 kg
PWR-100-S: 133mm x 300mm x 310mm, approx. 8kg