Re: Servo motor voltage
Posted by
bru103
on 2003-04-01 18:50:55 UTC
I'm a new guy just following along....but I wonder if Darcy might
have picked up the wrong value for "R" in the formula. If I
understand the calculations, 4 ohms is being used, and that isn't
the spec...it was .75 to 1.02 ohms at 4 AMPS, not 4 OHMS. If I got
it right, that makes a big difference in the required voltage.
--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Parker, Darcy "
<dparker@p...> wrote:
the two.
reach it if you have trouble.
are there, for OT subjects, that are not allowed on the CCED list.
EXCEPTIONS........
reach it if you have trouble.
there, for OT subjects, that are not allowed on the CCED list.
EXCEPTIONS........
have picked up the wrong value for "R" in the formula. If I
understand the calculations, 4 ohms is being used, and that isn't
the spec...it was .75 to 1.02 ohms at 4 AMPS, not 4 OHMS. If I got
it right, that makes a big difference in the required voltage.
--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Parker, Darcy "
<dparker@p...> wrote:
> I think you may need more than 66V.to Torque and you can control
> Ldi/dt+Ri+Ke*kRPM=(small if controlled)+4*8.9+25*2.100=88.1V
> (Ldi/dt) should be small if controlled because i is proportionate
> the rate of change of torque. Also L tends to be small...4*44.5=178V (momentarily)
>
> If the speed is 0 and the max current is used, then the voltage is
>power supply (and servo amp with higher rating)or a combination of
> Your estimates may be too high, or you may want a higher voltage
the two.
>the
>
> -----Original Message-----
> From: Chris Baugher [mailto:cbaugher_yahoo@b...]
> Sent: Tuesday, April 01, 2003 1:26 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Re: Servo motor voltage
>
>
>
> Hmm, I guess I'm not sure where you got the 48V from. 48V was for
> transformers I'm looking at. Anyway, here are the motor specs Ihave:
>blurry)
> 3 Electro-Craft DC Brushed Servo Motors, Model E712
>
> 37.51 Oz-In/A
> 25.0-30.5 V/KRpm
> Motor Terminal Resistance .75-1.02 Ohms @ 4A.
> Maximum Terminal Voltage 60V
> Maximum Continuous Speed 2100 RPM (No Load)
> Maximum Peak Torque 1500 Oz-In.
> Maximum Peak Current 44.5A (I think - the scan I have is very
> Maximum Continuous Stall Torque At Max Motor Temp 300 Oz-In.motors.
> Maximum Continuous Current 8.9A
>
> So what I want to know is if a 66V supply will be ok for these
>or
> C|
>
>
> On Tue, 1 Apr 2003, Mariss Freimanis wrote:
> > Chris,
> >
> > The motor has a rated RPM at 48VDC, at 66V its RPM will be 66/48
> > 1.375 times higher. The motor's rated power is its ratedcontinuous
> > torque times RPM. At 66V it will produce 1.375 times more powerthan
> > its rating. I just don't think that is a good idea for long lifeat
> > reliability.
> >
> > Mariss
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, Chris Baugher
> > <cbaugher_yahoo@b...> wrote:
> > > On Tue, 1 Apr 2003, Mariss Freimanis wrote:
> > >
> > > > Chris,
> > > >
> > > > If you don't ask the motor to go faster than its rated speed
> > 48VDC60V. So I
> > >
> > > Ok, well the max speed is 2100 RPM and the max voltage is
> > > should limit the motor speed to ~1700 RPM? What's thereasoning
> > behindyour
> > > that?(I'm not doubting you I'm just curious)
> > >
> > > > and if you don't load the motor past its rated torque then
> > 66VDCyour
> > > > should be just fine.
> > > > The 5V stuff makes it impossible to overload the motor; in
> > casewanliker@a..., timg@k...
> > > > you'll have to take care not to.
> > >
> > > That makes sense.
> > >
> > > C|
> >
> >
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> OFF Topic POSTS: General Machining
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>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to
there, for OT subjects, that are not allowed on the CCED list.
>THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING
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Servo motor voltage
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2003-03-31 20:44:22 UTC
Re: Servo motor voltage
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2003-03-31 21:34:03 UTC
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2003-03-31 21:51:31 UTC
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Re: [CAD_CAM_EDM_DRO] Servo motor voltage
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2003-03-31 22:59:34 UTC
Re: [CAD_CAM_EDM_DRO] Re: Servo motor voltage
Parker, Darcy
2003-04-01 04:53:35 UTC
RE: [CAD_CAM_EDM_DRO] Re: Servo motor voltage
bru103
2003-04-01 18:50:55 UTC
Re: Servo motor voltage
Parker, Darcy
2003-04-02 13:54:20 UTC
RE: [CAD_CAM_EDM_DRO] Re: Servo motor voltage
Mariss Freimanis
2003-04-02 15:03:32 UTC
Re: Servo motor voltage
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2003-04-03 05:13:50 UTC
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