Dynamometer is a device for measuring force, moment of force (torque), or power. The power produced by an engine, motor or other rotating prime mover can be calculated by simultaneously measuring torque and rotational speed (RPM). Dynamometer is a loading device for performance & endurance test of Engines, Motors, Gears & Gear boxes, Shafts & Axles, Chassis, Bearings & other mechanical transmission products. In order to test the engine it is generally necessary to use a Dynamometer Controller, which is usually an electronic unit that has the capability of controlling the load on the dynamometer and can measure or sense the load and speed. Dynamometer controllers generally operate in two modes: Speed Controlled operation or Load Controlled operation.

Dynamometer Types

  • Absorbing Dynamometers – acts as a load that is driven by the prime mover that is under test.
  • Inertia Dynamometers – calculates power solely by measuring power required to accelerate a known mass drive roller and provide no variable load
  • AC-DC Motoring Dynamometer acts as a motor that drives the equipment under test.
  • Engine Dynamometer is a dyno that is coupled directly to an engine.
  • Chassis Dynamometer is a dyno that can measure torque and power delivered by the power train of a vehicle directly from the drive wheel or wheels (without removing the engine from the frame of the vehicle).
  • Universal Dynamometer is an absorber/driver with an absorption unit with a motor.
  • Eddy Current or Electromagnetic Brake Absorption Dynamometer
  • Magnetic Powder Brake Absorption Dynamometer
  • Hysteresis Brake Absorption Dynamometer
  • Electric Motor-Generator Dynamometer
  • Fan Brake Absorption Dynamometer
  • Hydraulic Brake Absorption Dynamometer
  • Mechanical Friction Brake or Prony Brake Absorption Dynamometer
  • Water Brake Absorption Dynamometer
  • Pneumatic Dynamometers
  • Constant Force Dynamometer
  • Constant Speed Dynamometer

Applications of Dynamometers

  • Dynamometers are used to control systems of various kind, from conventional Spring Balance for Torque measurments,to Load Cell & PC based scada control system to control & monitor Power & its components such as Speed, Torque, Tension, Friction, Voltage, Current, Power Fcator etc.
  • Dynamometer can also be used to determine the torque and power required to operate a driven machine such as a pump. In that case, a motoring or driving dynamometer is used. Dynamometer that is designed to be driven is called an absorption or passive dynamometer. Dynamometer that can either drive or absorb is called a universal or active dynamometer.
  • In addition to being used to determine the torque or power characteristics of a machine under test (MUT), dynamometers are employed in a number of other roles. In fact, beyond simple power and torque measurements, dynamometers can be used as part of a testbed for a variety of engine development activities such as the calibration of engine management controllers, detailed investigations into combustion behavior and tribology.
  • In the medical applications, hand-held dynamometers are used for routine screening of grip and hand strength and initial and ongoing evaluation of patients with hand trauma or dysfunction. They are also used to measure grip strength, pinch strength, and to perform muscle fatigue studies in patients where compromise of the cervical nerve roots or peripheral nerves is suspected.
  • In the rehabilitation, kinesiology, and ergonomics realms, force dynamometers are used for measuring the back, grip, arm, and/or leg strength of athletes, patients, and workers to evaluate physical status, performance, and task demands. Typically the force applied to a lever or through a cable are measured and then converted to a moment of force by multiplying by the perpendicular distance from the force to the axis of the level.