The Hysteresis Dynamometer

The benefit of Hysteresis Dynamometers

A Hysteresis Dinamómetro is a testing device used to measure torque, velocidad, and power of electric motors, including AC, DC, BLDC, and stepper motors. It is widely used in motor performance evaluation and research.

When selecting a dynamometer for motor testing, it’s essential to understand that the measurements of load characteristics and torque ripple/cogging torque characteristics are different. A single type of torque sensor may not provide accurate results for both, as the measurement requirements vary significantly. For example, a Hysteresis Braking system allows dynamometers to generate torque without requiring speed, enabling full motor testing from free-run to locked rotor. Cooling is provided by either air, or in some cases, a blower and liquid cooling system, depending on the test needs.

Key Features of Hysteresis Dynamometers:

Accuracy: Hysteresis Dynamometers offer precise measurements with an accuracy of ±0.25% full scale, depending on the size and system configuration.
Torque: They are designed to measure and provide torque at various points, including rated torque, locked rotor torque, and breakdown torque.
Speed and Power Ratings: Dynamometers are rated for maximum torque, velocidad, and power. The speed rating indicates the maximum speed at which the dynamometer can operate safely under light load or free-run conditions. However, this is not the speed at which full braking torque can be applied.

Testing Principle

Hysteresis dynamometers employ electromagnetic induction to generate braking torque.
The torque produced is independent of the shaft speed, which facilitates precise load control.
The braking system comprises a pole structure and a steel rotor.
The magnetic flux present in the air gap generates a frictionless braking force.
Torque can be adjusted by regulating the excitation current.

Testing Content

Torque Testing: This procedure measures real-time torque output with high precision.
Speed Testing: This evaluation assesses motor performance across various speeds.
Power Testing: This process calculates both input and output power for the purpose of efficiency analysis.
Efficiency Testing: This testing determines the rates of energy conversion efficiency.
Temperature Rise Testing: This monitoring assesses heat generation under load conditions.
Vibration Testing: This assessment evaluates the mechanical stability during operation.
Noise Testing: This measurement quantifies sound levels during motor operation.
Load Characteristics Testing: This analysis examines performance under varying load conditions.
Cogging Torque Testing: This evaluation measures torque ripple and operational smoothness.
Overload Capacity Testing: This test assesses performance beyond the rated load limits.
Starting Performance Testing: This measurement evaluates the motor’s startup characteristics.
Transient Response Testing: This evaluation examines the system’s response to sudden changes in load.
Harmonic Analysis: This analysis detects distortions in voltage and current during operation.

Advantages

This system provides precise measurement of torque that is independent of speed.
The frictionless operation contributes to reduced wear and lower maintenance costs.
This technology supports testing under conditions ranging from free-run to locked rotor.
High accuracy (±0.2%-0.5% full scale) is assured, ensuring reliable results.
A variety of cooling options (convection, air, blower) are available to facilitate extended testing periods.

Applications

Motors:
- Combustion engine (automotive, motorcycle, chainsaw, etc.)
- Hybrid
- Electric
- Hydraulic (Aerospace, machinery)
Pumps (hydraulic, oil)
Propeller (Aerospace, marine, helicopter)
Automobile industry, torque measurement on labor and/or production (Formula 1, screen wiper, electrical windows, starter, generator, brake)
Reduction gear, gearboxes
Clutch, overload clutch
Motorized valve drill, pneumatic tools
Other machine tools

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