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Speed- Torque Characteristics

Posted: Tue Jan 25, 2011 11:26 pm
by jasonthoe
Why is the safe operation line for AC Speed control Motors (Mss-W, US and ES01 & 02) INCREASES from lower to higher speed with increasing Torque? Shouldn't it be the other way round as in higher speed with lower torque? Thanks for the help

Re: Speed- Torque Characteristics

Posted: Wed Jan 26, 2011 9:58 am
by omsupport1
Jason,

In order to answer your question, we need to know that:
-Input power to a speed control motor varies with the load and speed.
-The greater the load, the greater the input power to the motor, which means the temperature rise of the motor will also be greater.
-In addition, the lower the speed, the greater the input power to the motor, which means the temperature rise of the motor will also be greater.

The safe operation line is determined by the motor temperature of the motor. By running the motor anywhere on or below the safe operation line, the motor can be run continuously (30 minutes maximum for a reversible motor).

So, the safe operation line has a rising slope because the speed control motors require more power, which means a higher temperature rise at the lower speeds.

Does this answer your question?

Re: Speed- Torque Characteristics

Posted: Wed Jan 26, 2011 6:59 pm
by jasonthoe
Thanks a lot. This has been very helpful.

Re: Speed- Torque Characteristics

Posted: Thu Feb 03, 2011 11:04 am
by omsupport1
Glad we could help.

Re: Speed- Torque Characteristics

Posted: Sun Jul 10, 2011 5:24 am
by paulwalker_92
Thanks for the information. This is very helpful for me too.

Re: Speed- Torque Characteristics

Posted: Mon Sep 14, 2015 3:03 am
by aldoned
:D :D :D :D