Small Variable Frequency Drive
Small Variable Frequency Drive
(OP)
I have a 1.5HP 3ph variable speed motor drive from a varaible frequency drive to give about 10:1 speed range. What is the speed / torque characteristic common to this setup.
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Small Variable Frequency Drive
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RE: Small Variable Frequency Drive
With an AC induction motor with squirrel cage rotor, external fan cooled -- Constant Torque.
With an AC induction motor with squirrel cage rotor, intermittant duty -- Constant HP.
... etc ... etc ...
RE: Small Variable Frequency Drive
RE: Small Variable Frequency Drive
RE: Small Variable Frequency Drive
RE: Small Variable Frequency Drive
RE: Small Variable Frequency Drive
Check motor manufacturer for minimum operating speed on inverter power for a lathe application.
I.E. Marathon Electric makes a BlackMax motor that is capable of 1000:1 constant torque..... They also make Blue max motors rated for 20:1 and 10:1 constant torque speed ranges w/o requiring auxiliary cooling. Their inverter motors, such as those stated above, are often closer to a NEMA design A than a design B motor speed-torque curve. They have a stiffer speed-torque characteristic, and because of less copper in the slots, are able to produce the torque with less heat (copper losses) ...
Back to application, ... lathe mfgr can give you either curves of data points or curves that show HP vs speed requirements.
That will be the determinent when discussing the application with the motor manufacturer.
RE: Small Variable Frequency Drive
RE: Small Variable Frequency Drive
RE: Small Variable Frequency Drive
Can you give me a reference to "Variable Frequency Drive Characteristic Curves" .. I'd like to see to what you are referring.
Thanks.