Power Electronic Circuits Work As Soft Starter Of Induction Motor |
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Power Electronic Circuits Work As Soft Starter Of Induction Motor |
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 Jun 30 2007, 10:30 PM
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#1
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 Group: Members Posts: 1 Joined: 30-June 07 Member No.: 3,447  |
hi all,
i need power electronic circuits that wark as soft starter of induction motor,using SCRs and TRIACs. |
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Jul 2 2007, 09:50 AM
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#2
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Posting Freak Group: Moderator Posts: 2,086 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
Hello suma
The power circuitry is very simple, it requires an AC switch in series with one or more phases to the motor. the AC switch can be a triac, a reverse parallel connected SCR diode or reverse parallel SCR SCR circuit. Se http://www.lmphotonics.com/sstart.htm It is that simple, the problems are in the control systems. Best regards, -------------------- Mark Empson administrator
Skype Contact = markempson | phone +64 274 363 067 LMPForum | LMP Tech Warehouse | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | LMP Software | Mark Empson Website |
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Jan 11 2008, 06:14 PM
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#3
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Junior Member Group: Members Posts: 3 Joined: 11-January 08 Member No.: 4,183 |
What rating should be used if the SCR is directly connected to the 220V 50Hz power cord?
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Jan 11 2008, 08:06 PM
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#4
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Posting Freak Group: Moderator Posts: 2,086 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
Hello zara
The voltage rating of the SCR should be at least 3 times the voltage of the AC supply. For a 230 volt supply, the voltage should be 690 volts. Best regards, -------------------- Mark Empson administrator
Skype Contact = markempson | phone +64 274 363 067 LMPForum | LMP Tech Warehouse | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | LMP Software | Mark Empson Website |
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Jan 12 2008, 04:34 PM
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#5
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Junior Member Group: Members Posts: 3 Joined: 11-January 08 Member No.: 4,183 |
Thanks, marke.
This voltage rating is rms voltage rating, right? How about the current rating should be used if the load is 1000W which is also connected to power cord supply directly? Normally the current rating is rms rating or average rating? |
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Jan 12 2008, 10:05 PM
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#6
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Posting Freak Group: Moderator Posts: 2,086 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
Hello zara
QUOTE voltage rating is rms voltage rating, right? CorrectQUOTE How about the current rating should be used You should calculate the junction temperatures and ensure that the junction temperature of the SCRs do not exceed the maximum rated junction temperature.The junction temperature is a function of the SCR thermal characteristics and the heatsink characteristics. Best regards, -------------------- Mark Empson administrator
Skype Contact = markempson | phone +64 274 363 067 LMPForum | LMP Tech Warehouse | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | LMP Software | Mark Empson Website |
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