Repost: Soft start clutch
Archiver
Posts: 46,084
Hmm..the initial post seems to have vaporized.
My application uses an electric clutch attached to a gasoline motor-
add 12 volts, clutch engages. The problem is that it engages so hard
that breakages are occurring. Has anyone an idea how to slowly
engage this device- It is "currently" being activated by a MOSFET
that is driven by an opto and a bs2p output. Any ideas are
appreciated.
Tim
My application uses an electric clutch attached to a gasoline motor-
add 12 volts, clutch engages. The problem is that it engages so hard
that breakages are occurring. Has anyone an idea how to slowly
engage this device- It is "currently" being activated by a MOSFET
that is driven by an opto and a bs2p output. Any ideas are
appreciated.
Tim
Comments
1 What are you running off the engine
2 What is the starting torque of this device
3 What is the clutch rated at
4 What is breaking
5 What RPM is the motor running at
6 Most motors have air flaps for keeping the motor at a constant RPM
load/noload
And yes you may be able to ramp up the voltage with slippage and heating and
breaking
Larry Gaminde
Original Message
From: "ohiotim2" <tweaver@i...>
To: <basicstamps@yahoogroups.com>
Sent: June 27, 2003 8:06 AM
Subject: [noparse][[/noparse]basicstamps] Repost: Soft start clutch
> Hmm..the initial post seems to have vaporized.
>
> My application uses an electric clutch attached to a gasoline motor-
> add 12 volts, clutch engages. The problem is that it engages so hard
> that breakages are occurring. Has anyone an idea how to slowly
> engage this device- It is "currently" being activated by a MOSFET
> that is driven by an opto and a bs2p output. Any ideas are
> appreciated.
>
> Tim
>
>
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>
increse it.
With hardware, you can insert a choke in series, when applied power,
the choke will limit the current until it saturates.
Inductance of the choke could be defined as;
V=L*di/dt
simplifying, L (henries)=Voltage applied*time/Current
magnet)
Larry Gaminde
Original Message
From: "Jim Forkin" <jjf@p...>
To: <basicstamps@yahoogroups.com>
Sent: June 27, 2003 12:31 PM
Subject: RE: [noparse][[/noparse]basicstamps] Repost: Soft start clutch
> You need to ramp the voltage up very slowly to allow the clutch to slip.
Do
> this with an integrator circuit, however, some clutch designs will not
> engage slowly but instead have an on/off type of engagement. This is
> typical of the type used on automotive air conditioner compressors. In
that
> case, shock is absorbed by the belt stretch/slippage. Another approach,
you
> may need to soft couple to your motor using a rubber coupling which will
> absorb some shock. Or, change to v belt coupling and adjust the tension to
> allow some slippage on engagement. This is one reason that centrifigal
> clutches are used in these types of applications so that engine speed is
> increasing and starting to drive the load and when speed comes up high
> enough to support the load, the clutch is fulling engaged. It also slips
> when the load speed exceeds the drive speed. If you can engage the clutch
> at a low speed and then increase engine speed it may solve your problem.
>
> jim
> http://www.geocities.com/jimforkin2003/
>
>
>
Original Message
> From: ohiotim2 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=8XMtxg7-ZrrEgxQqH5eU-oQkKeeaQ30cCmim0W9IUoK0QuOpO-ezRp6MKvoj1oc2XV1KVkVb9_wB8CMuUeDh]tweaver@i...[/url
> Sent: Friday, June 27, 2003 11:07 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Repost: Soft start clutch
>
>
> Hmm..the initial post seems to have vaporized.
>
> My application uses an electric clutch attached to a gasoline motor-
> add 12 volts, clutch engages. The problem is that it engages so hard
> that breakages are occurring. Has anyone an idea how to slowly
> engage this device- It is "currently" being activated by a MOSFET
> that is driven by an opto and a bs2p output. Any ideas are
> appreciated.
>
> Tim
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
> Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
this with an integrator circuit, however, some clutch designs will not
engage slowly but instead have an on/off type of engagement. This is
typical of the type used on automotive air conditioner compressors. In that
case, shock is absorbed by the belt stretch/slippage. Another approach, you
may need to soft couple to your motor using a rubber coupling which will
absorb some shock. Or, change to v belt coupling and adjust the tension to
allow some slippage on engagement. This is one reason that centrifigal
clutches are used in these types of applications so that engine speed is
increasing and starting to drive the load and when speed comes up high
enough to support the load, the clutch is fulling engaged. It also slips
when the load speed exceeds the drive speed. If you can engage the clutch
at a low speed and then increase engine speed it may solve your problem.
jim
http://www.geocities.com/jimforkin2003/
Original Message
From: ohiotim2 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=-mHeb2oeR8tqmr4UX55QicQEg8f5XcsWV69qpYPVxt3JrQVhRMAHJM7USpyqDEwuVCfvzI7C1jcxpawt0723]tweaver@i...[/url
Sent: Friday, June 27, 2003 11:07 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Repost: Soft start clutch
Hmm..the initial post seems to have vaporized.
My application uses an electric clutch attached to a gasoline motor-
add 12 volts, clutch engages. The problem is that it engages so hard
that breakages are occurring. Has anyone an idea how to slowly
engage this device- It is "currently" being activated by a MOSFET
that is driven by an opto and a bs2p output. Any ideas are
appreciated.
Tim
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/