Test Bench Engines

In each case, the motor should be carefully checked to determine whether to forward or simple repair. The technician must decide on studying the peculiarities of operation. To do this, at the moment of testing stand must be used. Term dynamometer relates to such a test.

Dynamometer mechanical consists of the stand and a group of pulleys with outside diameters equal, but with shaft diameters to fit different size motor shafts. The faces of these pulleys smooth and even. Torque arms, lined automotive brake linings are organized according to the pulleys. Torque hand exactly one leg between his point of support on the scales and the center of the motor pulley. Spring adjustment mechanism is organized on the friction surfaces moment of hand. This allows the different friction force, to be made between the torque arm and motor pulley.

At the end of the torque arm rests or the spring scale or, preferably, a platform scale. Hands should be balanced to remove any previous boot scale. During the readings are taken, torque arm should be at the same level. The motor torque can then be carefully checked for laggard, and at full speed downloads.

Torque, thus obtained can be read directly from the scales in pound-feet. When these details are verified manufacturer, torque, will show the condition of the engine. Switch and brush mechanisms of these engines can also be tested on the stand. Ammeters, voltmeters, wattmeters and will determine the electrical characteristics of the motor.

Increasing the temperature of the bearings must be carefully analyzed. Thermometer placed in the bearing oil reservoir is recommended for this purpose. Temperature increase should not exceed 72F (40C) above room temperature. Electric dynamometers are available to measure the power output of the motors. They can also start the engine, to determine their friction losses. Electric meters should be installed in the panel thus to push switches can put amperemeter, voltmeter, or wattmeter in the chain.

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