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Magnetic particle dynamometer


A magnetic particle dynamometer, also known as a particle dynamometer, is composed of a magnetic particle brake, eddy current brake, or hysteresis brake as a loader. As the name implies, it contains a magnetic particle, and the current through the coil generates a magnetic field that changes the nature of the magnetic particle to produce a smooth braking torque through the friction between the rotor and stator. The magnetic particle dynamometer produces the rated torque at zero speed. The element to be measured can be loaded at rest to determine the starting torque.

Magnetic Particle Brakes
Magnetic Particle Brakes

Basic Structure

The basic structure of a magnetic particle dynamometer is composed of a stator, solid rotor, excitation coil, magnetic particle medium, bracket, base plate, etc. The magnetic particle dynamometer is mainly used to test the power of the engine but also can be used as loading equipment for reducers and gearboxes to test their transferred power.

Working principle

When the internal coil of the dynamometer passes through the current, the magnetic field is generated, so that the internal magnetic particle is arranged into a magnetic chain according to the magnetic force line, and the magnetic particle chain generates a pulling force into resistance to prevent the rotor from rotating, and the force is the load torque. The load torque can be changed by changing the excitation current.


The magnetic particle dynamometer is suitable for applications where the torque is large and the speed is low. Such as asynchronous motors, DC gear motors, and constant tension control used in paper and textile industries.


The magnetic particle dynamometer system has the advantages of high precision, compact structure, easy operation, and wide application, and can be used with magnetic powder brakes or magnetic particle clutches to perform loading tests, efficiency tests, temperature rise tests, and blocking tests. Magnetic particle dynamometer is widely used in various AC and DC motors, fans, internal combustion engines, reducers, hydraulic motors, pumps, mixers, traction machines, electric plate handlers, drilling machinery, and other power and transmission machinery torque, speed, power, efficiency, voltage, current, electric power factor, oil pressure, flow, temperature rise and other parameters of the measurement.