Dynamometers

Motor and engine testing dynamometers apply braking or drag resistance to motor rotation, and measure torque at various speeds and power input levels. These devices measure the output torque of motors, engines, gearboxes, transmissions, and other rotary machines. They can include features such as fuel and exhaust monitoring for internal combustion engines, input power analysis for electric motors, and temperature and vibration sensing.  Air dynamometers use an impeller to assess the power produced by a jet engine or gas turbine.   AC dynamometers are essentially AC motors mounted and configured to provide drag against the motor being tested and output the resultant torque and power.   DC dynamometers are essentially DC motors mounted and configured to provide drag against the motor being tested and output the resultant torque and power.   Eddy current dynamometers provide restraining torque that increases with shaft speed.  In a hydraulic or water brake dynamometer, braking drag is applied to the dynamometer rotor vanes via water circulating between the rotor and the stator housing.  Hysteresis dynamometers use noncontact magnetic braking to apply resistance to motor rotation.  A magnetic powder dynamometer has a friction braking system using a magnetic powder medium between the rotor and the stator.   With a prony or friction brake dynamometer the braking mechanism uses friction pads or brake shoes to engage the rotating disk or drum coupled to the motor.  A combination of two or more technologies is a tandem or combination dynamometer.

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