85
parameters, the motor takes longer to accelerate to rated speed, whereas the 10 hp motor
accelerated to rated speed more rapidly. Second, there is significantly more disagreement
between the simulated results and the measured results during acceleration.
The reason that the simulation using the motor manufacturer parameters shows a longer
acceleration time is because the shaft torque developed when using the these parameters is
significantly less than what the motor produces. Fig 60 shows the shaft torque for this case.
Although the magnitude of the shaft torque during starting appears high, the average value is
actually lower. The large oscillations are a result of the response of the dynamic load model.
Although the non-linear model is an improvement over the standard motor model, the non-
linear model still needs improving. The differences between the non-linear motor model and
the measured data are a result of the fact that equations (4.6) (4.12) do not completely
describe the stator and rotor leakage reactance terms and the rotor resistance term for the 50
hp motor tested. The motor produces more torque during starting and adjustments to these
equations can improve the starting torque characteristic. It should be noted that the
discrepancies are not a result of poorly estimated parameter values, but rather oversimplified
variations of the stator and rotor parameters described by (4.6) (4.12). Improvements to
these equations will improve the modeled behavior of the motor.
Summary :
85 parameters, the motor takes longer to accelerate to rated speed, whereas the 10 hp motor accelerated to rated speed more rapidly. The differences between the non-linear motor model and the measured data are a result of the fact that equations (4.6) (4.12) do not completely describe the stator and rotor leakage reactance terms and the rotor resistance term for the 50 hp motor tested.
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motor,model,torque,parameters,result,rotor,equations,during,shaft,starting,shows,412,between