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MEASURING MOTOR PARAMETERS - Control Technology …

1 MEASURING MOTOR PARAMETERS File: MOTOR PARAMETERS These are the MOTOR PARAMETERS that are needed: MOTOR voltage constant Ke (volts-sec/rad) MOTOR torque constant KT (lb-in/amp) MOTOR resistance Ra (ohms) MOTOR inductance La (Henries) MOTOR inertia Jm (lb-in-sec^2) Load inertia reflected to the MOTOR armature shaft Jload (lb-in-sec^2) Total inertia=Jm+Jload Jtotal(lb-in-sec^2) Note that the above values are stated for a single winding with dc motors, and are the phase values for a BLDC MOTOR .

the step in input current is applied to the motor input, the maximum value of current . 4 should be noted. This current must be converted to torque. The torque is equal to the maximum value of current observed multiplied by the motor torque constant. Torque [lb-in]= amps[a] x KT [lb-in/a]. The inertia is then the acceleration torque divided by the

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