With field weakening, an asynchronous motor can be operated above its rated speed.
If the speed of rotation is high, the magnetization of the motor must be reduced, for which reason the full torque is no longer available.
Field weakening is possible both in controlled operation and regulated operation.
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Step |
Action |
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1 |
In the motor data structure, set the parameter uiMaxSpeed to the desired maximum speed of rotation. If for example, the asynchronous motor is to be operated with a rated speed of 1380 U/min up to a maximum rated speed of 1800 rpm, the motor data structure must be filled with the following values: … |
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2 |
Set parameter MaxVel by default to the rated speed of the drive. To be able to run a higher speed of rotation, MaxVel must be increased using the parameter] UserMaxVel. In the example, the parameter UserMaxVel is set to the value (uiMaxSpeed / 60) *FeedConstant = (1800/60) * 360 = 10800. |
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3 |
If UserMaxVel in Sercos phase 4 was changed, a new Sercos run-up has to be performed (phase 0 => phase 4). |
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4 |
After the new Sercos run-up, the changed maximum speed of rotation is shown in parameter MaxVel. The motor can now be moved as usual. |
