Non-sparking speed-controlled motor

B

Bruce Freeman

Guest
I'm interested in converting a device driven by a 1/3 HP
speed-controlled DC motor (which sparks) to a non-sparking motor.

I've considered air motors, but am told the control is poor and the
starting torque is very low.

I've considered variable frequency driving an induction motor, but the
only such controller I've found is quite expensive. I'd be interested
in this option if moderately priced controllers are available.

An electronic stepper motor was suggested, but I know so little about
those and the controllers they require, that I don't know where to
begin looking into it. Suggestions would be appreciated.

A hydraulic motor was suggested, but same problem as above. Also,
these seem mostly quite large and powerful, whereas I would need only
fractional horsepower. In this case, I would need information how to
assemble the complete system, from prime mover (electric motor) to
pump to hydraulic motor, including any accessory equipment. Although
I like the properties of such a motor, I am put off by the
complexities of the system. Again, suggestions would be appreciated.

I need to know where to find basic information on these motors. I
have no problem spending some money on books or other materials. I
just don't know where to start. I would also need to know suppliers
for components or systems.

Thanks.
 
Bruce Freeman writes:

I'm interested in converting a device driven by a 1/3 HP
speed-controlled DC motor (which sparks) to a non-sparking motor.
Click to expand...
Brushless DC servo.

http://www.pacsci.com/
 
3 phase motor driven by a VFD. Mithg as well be an explosion-proof
motor, too. VFDs are not cheap, though you can sometimes find them
surplus, and you can shop around somewhat, as there are multiple
suppliers.

--
Cats, Coffee, Chocolate...vices to live by
 
How about a TEFC or TENV from Grainger, just looked and they have a bunch in
the 1/3 hp range.
--
<<< There are only 10 kinds of people...Those that understand binary and
those that don't. >>>


"Bruce Freeman" <freemab@hotmail.com> wrote in message
news:f586f039.0403230941.60911d4a@posting.google.com...
I'm interested in converting a device driven by a 1/3 HP
speed-controlled DC motor (which sparks) to a non-sparking motor.

I've considered air motors, but am told the control is poor and the
starting torque is very low.

I've considered variable frequency driving an induction motor, but the
only such controller I've found is quite expensive. I'd be interested
in this option if moderately priced controllers are available.

An electronic stepper motor was suggested, but I know so little about
those and the controllers they require, that I don't know where to
begin looking into it. Suggestions would be appreciated.

A hydraulic motor was suggested, but same problem as above. Also,
these seem mostly quite large and powerful, whereas I would need only
fractional horsepower. In this case, I would need information how to
assemble the complete system, from prime mover (electric motor) to
pump to hydraulic motor, including any accessory equipment. Although
I like the properties of such a motor, I am put off by the
complexities of the system. Again, suggestions would be appreciated.

I need to know where to find basic information on these motors. I
have no problem spending some money on books or other materials. I
just don't know where to start. I would also need to know suppliers
for components or systems.

Thanks.
Click to expand...
 
"Bruce Freeman" <freemab@hotmail.com> wrote in message
news:f586f039.0403230941.60911d4a@posting.google.com...
I'm interested in converting a device driven by a 1/3 HP
speed-controlled DC motor (which sparks) to a non-sparking motor.

I've considered air motors, but am told the control is poor and the
starting torque is very low.

I've considered variable frequency driving an induction motor, but the
only such controller I've found is quite expensive. I'd be interested
in this option if moderately priced controllers are available.

An electronic stepper motor was suggested, but I know so little about
those and the controllers they require, that I don't know where to
begin looking into it. Suggestions would be appreciated.

A hydraulic motor was suggested, but same problem as above. Also,
these seem mostly quite large and powerful, whereas I would need only
fractional horsepower. In this case, I would need information how to
assemble the complete system, from prime mover (electric motor) to
pump to hydraulic motor, including any accessory equipment. Although
I like the properties of such a motor, I am put off by the
complexities of the system. Again, suggestions would be appreciated.

I need to know where to find basic information on these motors. I
have no problem spending some money on books or other materials. I
just don't know where to start. I would also need to know suppliers
for components or systems.

Thanks.
You have given no idea what the device might be,or why you need such
Click to expand...
a noiseless way of powering it,or indeed the frequency or time period
the device might be used for
Have you considered a bicycle drive?

bj
 
In article
<f586f039.0403230941.60911d4a@posting.google.com>,
freemab@hotmail.com says...
I'm interested in converting a device driven by a 1/3 HP
speed-controlled DC motor (which sparks) to a non-sparking motor.

I've considered air motors, but am told the control is poor and the
starting torque is very low.

I've considered variable frequency driving an induction motor, but the
only such controller I've found is quite expensive. I'd be interested
in this option if moderately priced controllers are available.
Click to expand...
I have no idea what you consider "moderately priced", but a
new low-end 1/3HP frequency drive is under $200. With a bit
of scrounging you should be able get something for well
under $100. In either case you'll need a 3-phase motor as
well.

As others have mentioned, there are what's known as
"brushless motors" available, but unlikely to be less
expensive than the frequency drive. Look at what Bodine has
to offer for motors and controls if you're curious about
brushless.

Ned Simmons
 
"Ned Simmons" <news@nedsim.com> wrote in message
news:MPG.1aca9697491973e9989899@news.suscom-maine.net...
In article
f586f039.0403230941.60911d4a@posting.google.com>,
freemab@hotmail.com says...
I'm interested in converting a device driven by a 1/3 HP
speed-controlled DC motor (which sparks) to a non-sparking motor.

I've considered air motors, but am told the control is poor and the
starting torque is very low.

I've considered variable frequency driving an induction motor, but the
only such controller I've found is quite expensive. I'd be interested
in this option if moderately priced controllers are available.


I have no idea what you consider "moderately priced", but a
new low-end 1/3HP frequency drive is under $200. With a bit
of scrounging you should be able get something for well
under $100. In either case you'll need a 3-phase motor as
well.

As others have mentioned, there are what's known as
"brushless motors" available, but unlikely to be less
expensive than the frequency drive. Look at what Bodine has
to offer for motors and controls if you're curious about
brushless.

Ned Simmons
Click to expand...
The brushless motor needs essentially the same kind of drive as an induction
motor (different enough not to swap, but same enough for cost comparisons).
Brushless motors can be built smaller than an induction motor for the same
output, but the $$ would go up.
 
Bruce Freeman wrote:
I'm interested in converting a device driven by a 1/3 HP
speed-controlled DC motor (which sparks) to a non-sparking motor.

I've considered air motors, but am told the control is poor and the
starting torque is very low.
Click to expand...
I don't see why that should be the case.

I've considered variable frequency driving an induction motor, but the
only such controller I've found is quite expensive. I'd be interested
in this option if moderately priced controllers are available.
Click to expand...
The cheapest variable speed drives for fractional horsepower 3 phase
motors I know of are sold at Automation Direct:
http://web1.automationdirect.com/adc/Shopping/Catalog/Drives_-z-_Motors/AC_Micro_Drives_(GS_Series)/GS1_Drives
http://web1.automationdirect.com/adc/Shopping/Catalog/Drives_-z-_Motors/Marathon_MicroMax_Motors_-_Inverter_Duty_(0.25HP_to_10HP)

An electronic stepper motor was suggested, but I know so little about
those and the controllers they require, that I don't know where to
begin looking into it. Suggestions would be appreciated.
Click to expand...
1/3 HP is pretty big for stepper motors.

(snip)

--
John Popelish
 
On Tue, 23 Mar 2004 19:36:09 -0500, the renowned John Popelish
<jpopelish@rica.net> wrote:

Bruce Freeman wrote:

I'm interested in converting a device driven by a 1/3 HP
speed-controlled DC motor (which sparks) to a non-sparking motor.

I've considered air motors, but am told the control is poor and the
starting torque is very low.

I don't see why that should be the case.

I've considered variable frequency driving an induction motor, but the
only such controller I've found is quite expensive. I'd be interested
in this option if moderately priced controllers are available.

The cheapest variable speed drives for fractional horsepower 3 phase
motors I know of are sold at Automation Direct:
http://web1.automationdirect.com/adc/Shopping/Catalog/Drives_-z-_Motors/AC_Micro_Drives_(GS_Series)/GS1_Drives
http://web1.automationdirect.com/adc/Shopping/Catalog/Drives_-z-_Motors/Marathon_MicroMax_Motors_-_Inverter_Duty_(0.25HP_to_10HP)

An electronic stepper motor was suggested, but I know so little about
those and the controllers they require, that I don't know where to
begin looking into it. Suggestions would be appreciated.

1/3 HP is pretty big for stepper motors.
Click to expand...
There were (are?) those old stepping/synchronous motors called
Slo-Syn. I think Superior Electric made 'em. Maybe not quite that big,
and bad starting torque (intolerant of rotational inertia), but low
shaft RPM (72 @60Hz) with no gearbox.

http://www.micromech.co.uk/dir_products/prod_range_slosyn_sync_motors.asp

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
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