Conveting hz to rpm on a vfd? - Practical Machinist
Dec 9, 2007 · To convert HZ to spindle RPM you have to know the spindle RPM at a nominal motor RPM. If the motor is rated at 1725 RPM at 60 hz and the spindle is spinning at 500 RPM …
VFD question, is RPM linear to HZ? - Practical Machinist
Jul 29, 2011 · At the advice of some here I switched out to a 2 pole 3450 RPM motor, final spindle speeds (in high gear) 8 Hz = 350 RPM, 47.5 Hz = 2000 RPM (in back gear) 8 Hz = 36 RPM, …
Help understand this torque vs RPM chart - Practical Machinist
Aug 31, 2007 · The old rule of thumb (subject to changes/improvements in VFD design, I suppose) is that a 60 HZ motor on a VFD will have constant torque at less than 60 Hz and …
Using VFD to overspeed a motor - Practical Machinist
Aug 5, 2014 · You lose torque because the V/Hz is dropping, so the current is dropping. When you overspeed AND provide the voltage to maintain the V/Hz, you maintain torque, and double …
General | OT - Generator Theory Question - Practical Machinist
Feb 28, 2007 · state how many pairs of poles would be fitted to a generator with a prime mover running at 700 RPM and an output frequency of 50 Hz My answer comes out at 4.28 pairs of …
Transformers, Phase Converters and VFD | max rpm for vfd.
May 6, 2004 · At 1 1/2 times 120 Hz (180 Hz) the motor will run to 3450 RPM - at double freq 7100 +/- RPM. This is sound practice. There is no danger of damaging the motor armature or …
Replacing 1750 RPM motor with 3-phase 3450 RPM motor
Apr 24, 2008 · Go with a 1750 RPM motor and over speed it, they can easily go to 100 or if need 120Hz. Better motors, such as inverter/vector motors are designed for a much wider operation …
What speed range can you expect from VFD? - Practical Machinist
Aug 26, 2004 · If it develops 2 HP at 60 Hz (1750 RPM) it will develop 1 HP at 30 Hz (900) and so on until at 200 RPM (or whatever) the motor devlops HP in proportion to the VFD's set Hz …
Transformers, Phase Converters and VFD | RPM nomenclature
Oct 10, 2009 · i.e. with the example motor - at any speed up to 1750 rpm, you will have 50 rpm of slip at the rated torque. If you load the motor to rated torque at 30Hz, you know that it will spin …
VFD Auto tune and setting max Frequency above nameplate?
Jan 28, 2012 · Now I'd like to increase the max RPM. So my plan is to go through the auto tune process again, this time setting the frequency and RPM to my desired values. Using: RPM = …