Chassis Dynamometer Drives to simulate on road conditions, whether at the race track, in the test lab, or performing End of Line Testing. Ultra quiet operation for NVH testing applications.

Unico’s Chassis Dynamometer Drives uses a modular design inverter for full regeneration to the three-phase power grid. A proprietary digital current regulator and a state-of-the-art controller allows you to operate any AC dynamometer motor (Asynchronous Induction, Synchronous Permanent Magnet, and IPM – Internal Permanent Magnet) without the current-loop setup required by conventional drives. And IGBTs with a switching frequency up to 30kHz, gives you the performance to run high speed dynamometer motors to match high speed requirements of the E-Motor under test.

Incredible speed and torque response with acceleration rates up to 300,000 rpm per second so you can confidently test with realistic load resistance for aggressive launch control modes, motoring, hill climb, and a variety of throttle applications. Ultra-quiet operation mode using built-in dual current regulators is ideal for NVH testing in both anechoic and hemianechoic test cells.

The drive features full automatic tuning capabilities that can be operated from either a remote terminal or the drive’s built-in keypad. After entering the motor nameplate data, the auto-tuning algorithm automatically identifies the additional parameters for operating the attached motor and configures itself for operation.

Unico’s dynamometer drive provides internal inertia simulation. The inertia simulator can simulate both fixed and dynamic inertias using either internal inertia models or an external real-time command from another controller.

The torque control loop can be closed internal to the drive without requiring any additional hardware to the system. The drive can also close the torque loop on an external torque transducer while using the internal torque estimator feedback at the same time. This provides the accuracy of the torque transducer while gaining the responsiveness of the torque estimator.

The drive has full four-quadrant operation with the ability to limit or block operation in any of the quadrants. This allows operation to be matched to the application. Additionally, the drive can limit the power in both motoring and regenerating modes.

The drive incorporates internal quadrant limiting that can be set for either full or partial blocking, depending upon the application.

Supports most industry standard communication protocol, making it versatile to work with any available automation system platform. A high-speed communications interface is optionally available to accept commands from existing customer controllers that are used to generate test profiles. Wired and fiber-optic options are available. Supported protocols include:

• CANopen
• CC-Link
• ControlNet
• DeviceNet
• Ethernet
• EtherCAT (async)
• Interbus
• LonWorks
• Modbus Plus
• Profibus DPV1
• Profibus Master
• EtherCat (sync)

Built-in safety and control interlocks are hardwired, opto-isolated, and software configurable to protect your investment and team. And with cabinet enclosure cooling options of air-cooled, water-cooled, and air-conditioned, this system will keep up with your testing and development program.