交流测功机/交流测功机测试台

AC Dynamometer / AC Dyno Test Bench — Four-Quadrant Motor Testing System

Name: AC Dynamometer/AC Dyno Test Bench
Brand: EconoTest

Four-quadrant AC dynamometer test benches covering 5–2,000 Nm, 8,000–18,000 RPM, 0.75–250 kW, ±0.2% accuracy.

What Is an AC Dynamometer?

An 交流测功机 (also called an AC dyno or AC dynometer test bench) is a four-quadrant precision testing device used to measure and control torque, 速度, and power in electric motors, 引擎, and powertrain systems. Unlike absorption-only dynamometers (eddy current or magnetic powder), an AC dynamometer operates in all four quadrants — it can act as both a load (braking/absorbing) and a drive (motoring), and in both forward and reverse rotation.

The system consists of an AC motor (asynchronous induction or permanent magnet synchronous) paired with a four-quadrant variable frequency converter. This enables precise control of load conditions across the full operating envelope of the unit under test (UUT), from zero RPM through maximum rated speed.

EconoTest AC dynamometer models (EC5A to EC2000A) cover torque from 5 纳米至 2,000 纳米, 速度从 8,000 到 18,000 转速, power from 0.75 千瓦至 250 KW, and achieve torque and speed measurement accuracy of ±0.20% full scale.

How Does an AC Dynamometer Work?

An AC dynamometer works through the bidirectional energy control capability of a four-quadrant frequency converter:

Loading mode (generator mode): The AC dynamometer absorbs mechanical energy from the unit under test by acting as a generator. The absorbed energy is converted to electrical power and fed back to the grid (regenerative) rather than dissipated as heat, significantly reducing energy costs during endurance testing.
Motoring mode (drive mode): The AC dynamometer drives the unit under test — for example, spinning up a transmission input shaft or providing motoring torque to an electric motor under test. This enables efficiency mapping, back-driving tests, and hybrid powertrain simulation.
Four-quadrant operation: By combining loading and motoring in both clockwise and counterclockwise rotation, the AC dynamometer can simulate all real-world operating conditions a motor or powertrain experiences during its service life.
扭矩控制: A high-precision torque transducer and speed encoder continuously monitor output. The frequency converter adjusts current in real-time to maintain the commanded torque or speed setpoint with ±0.20% accuracy.
Energy regeneration: Unlike eddy current or hysteresis dynos that dissipate absorbed energy as heat, the AC dynamometer recovers braking energy and returns it to the facility power supply, substantially reducing net energy consumption during braking and endurance tests.

Key Advantages of AC Dynamometers

AC Dynamometer vs. Eddy Current Dynamometer

范围	AC Dynamometer	Eddy Current Dynamometer
Operating quadrants	4 (motoring + 加载中, both directions)	1 (loading/absorption only)
Zero-speed torque	Available (motoring mode only; loading torque requires motion)	Not available
Energy recovery	Yes — regenerative, feeds power back to grid	No — all energy dissipated as heat
Speed range	8,000–18,000 RPM	最多 50,000 转速
Best for	EV motor efficiency mapping, powertrain, hybrid testing	High-speed motor and engine endurance testing
Cooling requirement	Air-cooled (converter cabinet)	Water-cooled (all models)
Capital cost	Higher	Lower
Operating cost	Lower (energy recovery)	Higher (all energy as heat)

AC Dynamometer vs. 磁粉测功机

范围	AC Dynamometer	磁粉测功机
Operating quadrants	4	1 (absorption only)
Zero-speed loading torque	Available at low speed (near zero)	Full rated torque at zero RPM
Speed range	8,000–18,000 RPM	2,000–5,000 RPM
Power range	最多 250 KW	最多 15 KW (ECF2000 continuous)
Best for	EV powertrain, high-power motor testing	生产线测试, servo/geared motors
Consumables	None	Periodic magnetic powder replacement

When to choose an AC dynamometer: Your application requires efficiency mapping across all operating quadrants, four-quadrant testing (both motoring and loading), speed above 5,000 转速, or energy cost reduction on long-duration tests.

技术规格

All EconoTest AC dynamometer parameters are confirmed from our official product specifications. All parameters can be customized upon customer request.

范围	范围 (EC5A – EC2000A series)
Rated torque	5 – 2,000 纳米
最大速度	8,000 – 18,000 转速
额定功率	0.75 – 250 KW
扭矩 & speed accuracy	±0.20% full scale

Detailed model-by-model specifications (扭矩, speed and power for each model in the EC5A–EC2000A series) are provided with your quotation based on your application requirements.

笔记: For applications requiring speeds above 18,000 RPM or power above 250 KW, see our 高速电机试验台 (最多 25,000 转速, 最多 800 KW) or contact our engineers for a custom configuration.

系统组件:

AC dynamometer motor (PMSM or induction, customer choice)
Four-quadrant frequency converter cabinet (regenerative, back-to-grid)
High-precision torque transducer (±0.20% FS)
Non-contact speed encoder
Industrial PC with real-time motor performance analyzer
Motor testing software (自动测试序列, 数据采集, report generation)
耦合, coupling guard, base frame, and safety interlock system
选修的: environmental chamber (−45°C to +150°C), battery simulator, cooling system controller

Applications by Industry

Automotive — EV Motor and Powertrain Testing

AC dynamometers are the primary tool for automotive EV motor validation. Test items include efficiency mapping (地图), 峰值扭矩, 峰值速度, T-N curve, NVH, EMC/EMI, thermal management, and durability. The four-quadrant capability is essential for hybrid powertrain testing where the electric machine alternates between motoring (driving the vehicle) and generating (regenerative braking) modes.

Typical automotive applications:

永磁同步电机 / 先进制造商 / EESM traction motor validation
E-axle (integrated inverter + 发动机 + 传播) performance and durability
Hybrid drivetrain calibration
Starter-generator characterization

Aerospace — Ground Support Equipment and Propulsion

Aircraft ground support equipment, electric actuators, and MEA (更多电动飞机) propulsion components require four-quadrant testing to validate both power generation and motor mode performance. AC dynamometers at power levels up to 250 kW cover the range for aircraft accessory drive testing.

Marine — Ship Propulsion and Generator Testing

Marine electric propulsion systems and shaft generators require high-torque, medium-speed testing. Higher-torque models in the EC5A–EC2000A range (最多 2,000 纳米) are appropriate for these applications. Four-quadrant capability enables simulation of both propulsion and regeneration conditions.

Industrial — Motor Manufacturing Quality Control

For industrial motor manufacturers, AC dynamometers provide comprehensive end-of-line performance verification covering efficiency, 功率因数, torque ripple, and speed regulation. Automated test sequences reduce cycle time compared to manual test bench operation.

AC vs. Eddy Current Dynamometer: Which to Choose?

Choose an AC Dynamometer if:

You need efficiency mapping across all four quadrants (motoring and loading)
Your motor application involves bidirectional operation or regenerative braking
You need to reduce energy costs on long endurance tests (regenerative energy recovery)
Testing involves hybrid powertrains or e-axle systems
You need automated efficiency map generation per standard drive cycles

Choose an Eddy Current Dynamometer if:

You only need absorption (加载中) mode — no motoring required
Speed requirements exceed 18,000 转速 (ECW series reaches 50,000 转速)
Budget is a primary constraint and energy recovery is not required
Your application is combustion engine testing or single-direction motor validation
Your application is small, high-speed motor testing

AC vs. 磁粉测功机: Which to Choose?

Choose an AC Dynamometer if:

Speed exceeds 5,000 转速
Power exceeds 15 KW
You need four-quadrant (motoring + 加载中) capability
You want no consumable powder replacement over the system lifetime

Choose a Magnetic Powder Dynamometer if:

You need full rated torque at exactly zero RPM (static load holding)
Speed range is below 5,000 转速
Your application is production line batch testing (伺服, geared motors, wiper motors)
Torque range is up to 2,000 Nm at low speed

AC Dynamometer Selection Guide

Follow this 4-step process to identify the correct AC dynamometer model:

Step 1 — Define motor rated torque and peak torque
The dynamometer rated torque must be equal to or greater than the motor’s peak torque (not just continuous rated torque). Select the next model up if your peak torque falls between two models.

Step 2 — Define maximum test speed
The dynamometer maximum speed must exceed your motor’s maximum test speed with adequate margin. EconoTest engineers will recommend the appropriate margin for your application.

Step 3 — Verify continuous power
Confirm the dynamometer’s rated power covers your continuous test cycle. For short-duration peak power tests, a slightly lower-rated model may suffice — consult EconoTest engineers.

Step 4 — Determine test mode requirement
If you only need loading (absorption) 模式, an eddy current or magnetic powder dynamometer may offer better value. If motoring, efficiency mapping, or energy recovery is needed, an AC dynamometer is required.

Quick selection reference:

The EC5A–EC2000A series covers 5–2,000 Nm, 8,000–18,000 RPM and 0.75–250 kW — EconoTest engineers will match the exact model to your torque, speed and power requirements
Beyond 2,000 Nm or 250 KW: contact EconoTest for custom configuration

Test Items Performed on an AC Dynamometer Test Bench

The EconoTest AC dynamometer test bench covers the following standard test items. Custom test sequences can be added per customer specification:

性能测试:

空载测试 (速度, 当前的, 电压, 力量)
Rated load test (output power, 扭矩, 效率)
Peak torque measurement
Peak speed measurement
T-N (Torque-Speed) characteristic curve
Efficiency map (地图) generation across speed/torque grid
Back EMF test
Torque fluctuation and speed fluctuation measurement
d-q axis inductance measurement
Electromechanical time constant
Electrical time constant

Dynamic Tests:

Motor start-up test
Frequency response bandwidth measurement
Torque control response time
Speed control response time
Dynamic position tracking error
惯性模拟
Forward/reverse speed difference rate

Durability and Thermal Tests:

Durability test (continuous operation at rated conditions)
Temperature rise test
Overspeed test
Thermal resistance measurement
Braking torque test

Driver/Inverter Tests:

Driver performance test
Locked rotor test
Speed regulation rate measurement

常见问题解答

What is an AC dynamometer?

An AC dynamometer is a four-quadrant testing device that uses an AC motor paired with a variable frequency drive to both load and drive the unit under test. Unlike absorption-only dynamometers, AC dynos can operate in all four quadrants — motoring and generating in both directions — making them the standard choice for EV motor, e-axle, and powertrain testing.

What is the torque and speed range of EconoTest AC dynamometers?

EconoTest AC dynamometer models (EC5A to EC2000A) cover torque from 5 纳米至 2,000 Nm and speeds from 8,000 到 18,000 转速. Rated power ranges from 0.75 千瓦至 250 KW. Measurement accuracy is ±0.20% full scale for both torque and speed. All parameters can be customized.

What is the difference between an AC dynamometer and an eddy current dynamometer?

An AC dynamometer can operate as both a motor and a load (四象限), allowing it to drive the unit under test and recover energy back to the grid. An eddy current dynamometer is absorption-only and cannot drive the test article. AC dynos are preferred for EV motor efficiency mapping; eddy current dynos are lower cost and suitable for engine and high-speed testing where motoring mode is not required.

Does the AC dynamometer feed energy back to the grid?

是的. EconoTest AC dynamometer systems use regenerative four-quadrant frequency converter technology that recovers braking energy and feeds it back to the power grid, significantly reducing energy consumption and operating costs for endurance and durability test programs.

Can an AC dynamometer test both motors and engines?

是的. EconoTest AC dynamometers are used for both electric motor testing and combustion engine testing. When paired with a gearbox, the system accommodates a wide range of speed and torque combinations. It is particularly suited for hybrid powertrain testing where both electric and ICE modes must be validated on the same platform.

How do I select the correct AC dynamometer model for my motor?

Selection is based on four parameters: (1) peak torque of the motor under test — select a dyno with rated torque equal to or greater than motor peak; (2) maximum operating speed — the dyno max speed must exceed the motor’s maximum test speed with adequate margin; (3) continuous power — match or exceed motor rated power; (4) application type — choose 4-quadrant AC dyno for EV/hybrid testing. Contact EconoTest engineers for a free selection consultation.

What test items can be performed with an AC dynamometer test bench?

The AC dynamometer test bench covers: no-load and rated load tests, peak torque and peak speed, 耐久性测试, 温升测试, T-N curve, back EMF, torque and speed fluctuation, 效率图 (地图), 前进/后退速度差率, 堵转测试, overspeed test, 惯性模拟, d-q axis inductance measurement, and driver performance test including bandwidth measurement.

What is the difference between an AC dynamometer and a magnetic powder dynamometer?

AC dynamometers support high-speed operation up to 18,000 RPM with energy regeneration and four-quadrant control, suitable for high-power EV and powertrain testing. Magnetic powder dynamometers deliver full torque at zero speed and are best for low-to-medium speed production line testing up to 5,000 转速. Magnetic powder units are lower cost but have no motoring capability and dissipate heat rather than recovering energy.

Get Specifications or Request a Quote

EconoTest engineers respond to all RFQ inquiries within 24 小时.

To receive a technical proposal, please provide:

Motor type (永磁同步电机 / 先进制造商 / EESM / other)
Rated torque (纳米) and peak torque (纳米)
Rated speed (转速) and maximum speed (转速)
额定功率 (KW)
Required test items (效率图, NVH, 电磁兼容, 耐用性, ETC。)
Environmental requirements (temperature range, humidity)

联系经济测试:

电子邮件: [email protected]
电话 / WhatsApp: +86 156 1877 0706
地址: 3F, 建筑 2, 不. 511 Xiaowan Road, Fengxian District, 上海, 中国

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All specifications confirmed from EconoTest official product documentation. Parameters are customizable upon request. EconoTest (上海伊科诺科技有限公司, 有限公司) — National High-Tech Enterprise.