on Sat, 22 Dec 2012 11:05:23 UT
|VFDs and EMC published
on Sat, 13 Aug 2011 23:12:28 UT
Incorrectly installed VFDs can cause very high levels of high
frequency conducted currents and voltages. This stray noise current
can cause severe interference with other equipment and
For more information, see
|Power factor correction published
on Sat, 09 Apr 2011 08:25:18 UT
I am in the process of creating a new power factor correction web site
Let me know if you have any comments or suggestions.
|Re: Electric-Motor-Control naturalFOC published
on Thu, 03 Jun 2010 10:34:04 UT
FOC is Field Oriented Contol in frequency convertors for AC motors. It is called Vector control. There is Sensorless FOC withÂ errors for the speed 0.05% and for the torgue 5% and Sensored FOC with erros for the speed 0.001% and the torgue 25.
on Tue, 01 Jun 2010 15:39:35 UT
Is any one know something about natural FOC?
I understand the FOC used in PMSM,
but what is natural FOC?
I appreciate if u could introduce the profile to me.
|Re: 2 pole motor replaced 4 pole motor published
on Wed, 14 Oct 2009 16:41:42 UT
The 2 pole motor turns 2 x faster than the 4-pole motor, so the pump
going to fast, pulleys, etc are understandable and possible. Seals
falling may be also possible. But the fact that the inverter does not
start the motor should not be an issue. Each motor, ...
|2 pole motor replaced 4 pole motor published
on Wed, 14 Oct 2009 08:48:27 UT
I had a watermaker on a motor vessel repaired including the replacement of the A C Motor.
About 1 HP 240 volt.
The contractor charged me lots of extras for additional work: Resizing pulleys because the pump was going too fast, seals kept failing, the inverter would ...
|Where can I find an online anti-virus that doesn't install on your PC? published
on Wed, 23 Sep 2009 17:18:17 UT
I've got 5 PCs that I'm trying to use to train disadvantaged young
people. The problem is they are riddled with viruses and a firewall
blocks me from updating them. The people in charge of maintaining the
PCs won't fix them or give me the admin password (Win XP) to let ...
|Re: Electric-Motor-Control Induction motor core loss published
on Wed, 16 Sep 2009 15:29:43 UT
What may ask would you need to know that for?
----- Original Message -----
To: "Electric Motor Control" <electric-motor-control@google groups.com>
Sent: Wednesday, September 16, 2009 10:17 AM
|Induction motor core loss published
on Wed, 16 Sep 2009 15:17:42 UT
Hi folks, am new to motor control. I have to calculate core loss by
this params: s=0.06; Un=220v; pf=0.619; f=50Hz; Zn=118.280 ohm;
Rs=10.2 Ohm; Rr=10.52 Ohm; Xls=8.17 Ohm -> Lls=0.026 H; Xlr = 19.16
ohm -> Llr=0.061 H; Xm=143.57 -> Lm = 0.457 H.
So haw to find Rc ...
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