Posted 28 March 2005 - 07:19 AM
In speed reduction mechanical gear box, the output torque is improved ( increased). For example If the speed reduction is 1:10, we can get the output torque increased by 10 times.
Now by using a electronic speed controller for speed reduction can we achieve the same torque improvement
Posted 28 March 2005 - 10:29 AM
As we reduce the frequency applied to the motor to reduce its speed, we must reduce the voltage applied to the motor so that the maximum flux is not exceeded. This results in the motor only being able to develop rated full speed torque at reduced speeds. In effect, the power rating of the motor reduces as the speed is reduced.
Below rated speed, AC induction motors can only deliver rated torque. Above rated speed, AC induction motors can deliver rated power.
Some vector drives can supply above rated torque in short bursts, but not continuously.
If you use a DC motor, you can get increasing torque as the motor reduces.
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Posted 28 March 2005 - 11:04 AM
Posted 29 March 2005 - 04:15 PM
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