This paper presents an acceleration method to evaluate the characteristics of small integral horsepower induction motor. Some previous works used the acceleration method to evaluate the torque-speed characteristic, but it is used for only a large and medium machine,-full voltage testing should not be performed - the reduced voltage technique is recommended. By using reduced voltage technique, the problems are occurred because current does not increase with voltage and torque does not increase with the square of voltage for all ranges of speed. Moreover, the saturation effect is not present during testing at the rated voltage. In small integral horsepower motor, full voltage testing can be performed consequently, the saturation effect will be presented in this test. In this paper, the 1-hp, 3-hp, and 5-hp three-phase squirrel cage induction motor are investigated. Practically, by using acceleration method, a long accelerating time is important to perform this test. Hence, an increasing moment of inertia technique is used to gain an accelerating time by coupling the known moment of inertia flywheel to the shaft of motor. Choosing and calculating the moment of inertia of flywheel are also proposed. During the acceleration, all important data from zero speed to nearly synchronous speed are recorded. For correcting data not only are data during the acceleration recorded hut also the speed during free deceleration is recorded for calculating the rotor moment of inertia and viscous friction coefficient as referred retardation test in IEC standard 34-2