A new torque meter has been designed in order to measure the output and index torques of the step motor used in the time piece. By using the data of the step motor measured with the above torque meter, several motor parameters (force factore K, residual magnetic torque factor K_z, index torque amplitude M_i, step angle of the rotor θ_0, and frictional torque of the rotor pivot Q) are obtained as results of the calculation with the computer. The configuration of the torque meter, the theory and method to obtain the motor parameters from the measured data, and the several examples of the measurement and calculation are stated in detail in this paper.
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