Transcription of MEASURING MOTOR PARAMETERS - Control Technology Corp
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MEASURING MOTOR PARAMETERS - Control Technology Corp
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 . Brushless dc motors (BLDC) are 3 phase synchronous motors used in a configuration to be treated as dc drives. MOTOR RESISTANCE For the winding resistance use an ohmmeter. For a dc MOTOR measure the resistance between the 2 armature wires. If it is a WYE connected BLDC MOTOR , the resistance is the line-to-line resistance.
3 MOTOR TORQUE CONSTANT Kt (for a DC MOTOR) 1.356 60 12 2 x T EI N π = EI = 0.011827 NT I T N E Ke = = 0.011827 RPM K V amp lb in Therefore K e T 0.011827 MOTOR INERTIA Jm Motor rotor inertia can be measured by making an experiment.
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