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AC dynamometer

Q: What does four-quadrant operation mean?

It allows control in both rotational directions and in both motoring and power-absorbing modes.

Q: How does the CAC system handle absorbed power?

Generated AC power is converted to DC and then back to AC for grid connection.

When used in conjunction with our company's FC2000 series measurement and control system, it can not only accurately measure and control the speed and torque of various rotating motor machinery, but also measure and control parameters such as temperature, pressure, flow rate, current, and voltage.

Regenerative Engine & Rotating Machinery Testing

CAC Series AC Dynamometer

A four-quadrant AC dynamometer system for precise speed and torque measurement and control, with regenerative grid connection and integrated multi-parameter test-cell acquisition.

4-quadrantDrive operation

Speed + torqueClosed-loop control

FC2000System integration

CAC series AC dynamometer installed in an engine test cell

Integrated AC motor, torque and speed sensors, ACS drive system and dynamometer controller.

Precise bidirectional control

One platform for motoring and absorbing operation

The CAC series is designed for power testing of engines and other rotating machinery. Its four-quadrant architecture supports controlled operation across both driving and absorbing conditions while the measurement system monitors the variables needed for a complete test.

01 / CONTROL

Speed and torque regulation

The ACS variable-frequency system adjusts motor grid current to control the speed and torque of the connected prime mover.

02 / REGENERATION

Grid-connected energy return

Generated AC power is converted to DC and then converted back to AC for grid connection during absorbing operation.

03 / MEASUREMENT

Integrated sensing

Torque and speed sensors form part of the standard system architecture for dynamometer feedback and test measurement.

04 / DATA

FC2000 system integration

Measure and control speed, torque, temperature, pressure, flow, current and voltage within one test environment.

System architecture

What is included in a standard CAC system?

The standard arrangement combines the load machine, measurement hardware, mechanical interfaces, power electronics and control functions needed to form an integrated AC dynamometer test platform.

AC dynamometer control workstation in an engine test facility

Core system components

AC motor used as the dynamometer load machine
Torque and rotational-speed measurement sensors
Base and flange for connection to the test machine
ACS four-quadrant variable-frequency drive and power distribution
Dedicated AC dynamometer controller
Optional integration with the FC2000 measurement and control system

Operating principle

From mechanical power to controlled electrical energy

The CAC system coordinates the AC machine and converter so the dynamometer can apply or absorb load while maintaining the requested test condition.

01Couple the test machine

The engine or rotating machine connects to the dynamometer through the specified base and flange arrangement.

02Measure speed and torque

Integrated sensors provide the feedback signals required for measurement and closed-loop control.

03Control the operating point

The ACS drive regulates current to command dynamometer speed or torque according to the test requirement.

04Return generated energy

During absorption, generated power is converted through the drive and returned as grid-compatible AC power.

Integrated measurement

Test-cell parameters in one control environment

When paired with Hance FC2000, the AC dynamometer becomes part of a broader engine or rotating-machinery measurement system rather than an isolated load device.

Mechanical variablesSpeed and torque measurement and control.

Thermal variablesTemperature-channel measurement for the test article and supporting systems.

Fluid variablesPressure and flow measurement across the configured test-cell circuits.

Electrical variablesCurrent and voltage measurement for applicable rotating electrical equipment.

Final sensor channels, interfaces, mechanical coupling and control modes should be confirmed for the specific machine under test.

Selection guidance

Information needed for system configuration

A correctly selected AC dynamometer must match both the mechanical operating envelope and the electrical and facility conditions of the test cell.

Machine type and test objectiveDefine whether the system will test an engine, motor or other rotating machine and the required test modes.

Torque and speed envelopeProvide continuous and peak operating points, direction of rotation and transient requirements.

Mechanical connectionConfirm shaft, flange, base height, alignment and coupling requirements.

Electrical infrastructureConfirm grid conditions, power distribution, regeneration requirements and installation environment.

Buyer questions

AC dynamometer FAQ

Answers to common questions when planning a regenerative engine or rotating-machinery test system.

What is an AC dynamometer used for?

It applies controlled motoring or absorbing torque to an engine or other rotating machine while measuring speed and torque across the required test conditions.

What does four-quadrant operation mean?

Four-quadrant operation allows the dynamometer drive to control torque in both rotational directions and to operate in both motoring and power-absorbing modes.

How does the CAC system handle absorbed power?

The generated AC power is converted to DC through the ACS converter and then converted back to AC for grid connection.

Which parameters can be measured with FC2000?

The supplied product information lists speed, torque, temperature, pressure, flow rate, current and voltage.

What information should be provided for selection?

Provide the machine type, torque-speed envelope, test modes, rotation direction, duty cycle, mechanical interface, grid conditions and desired measurement channels.

Complete the test cell

Related Hance systems

Combine the CAC dynamometer with control, alternative absorber technology and test-cell support equipment.

Configure the CAC system around your test envelope

Share the machine type, torque, speed, test cycle, grid conditions and measurement requirements with Hance.

Request AC Dynamometer Selection

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