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28 Jun 2006 12:02 #57785 by wiredgeorge
help with term was created by wiredgeorge
I picked up a British book on motorcycle electronics. They use a term I am not familiar with... thyristor - for instance, these are inside a voltage regulator and you can perform tests on the voltage regulator which tests these "thyristors". What is the word we would use here in the States for a thyristor? I think I know but my electrical knowledge is just good enough to get me into trouble bwhahaha

wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
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28 Jun 2006 12:11 #57788 by ltdrider
Replied by ltdrider on topic help with term
I thought a thyristor was a rectifier?

'76 KZ900 LTD (Blaze)
'96 Voyager XII (Dark Star)
'79 KZ650 Cafe Project (Dirty Kurt)
Greensboro, NC

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28 Jun 2006 12:24 #57793 by Mcdroid
Replied by Mcdroid on topic help with term
WG:

en.wikipedia.org/wiki/Thyristor


yup...it's a rectifier

Michael
Victoria, Texas

1982 GPz750
1977 KZ1000A
1978 KZ1000A
1982 GPz1100
1975 Z2A

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28 Jun 2006 13:04 #57802 by wiredgeorge
Replied by wiredgeorge on topic help with term
That is what I thought as there ain't much more to an old school voltage regulator. The Brit book I got from Whitehorse Press is by Haynes and is MOST EXCELLENT except for the odd term that isn't the same as what we use. It gives actual tests for a voltage regulator while the thing is off a bike so you don't have to mount it to find it is putting out 73 Volts DC hehe A lot of the specific tests are for older Kaws using 3 phase alternators (stators as found on most of our bikes)! Good stuff. Thanks! I didn't want to have to call Saunders again as his Brit is starting to fade and he isn't all that useful for translating hehe

wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
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28 Jun 2006 13:19 #57805 by Mcdroid
Replied by Mcdroid on topic help with term
WG: What book is this? Where and how did you get it?

Michael
Victoria, Texas

1982 GPz750
1977 KZ1000A
1978 KZ1000A
1982 GPz1100
1975 Z2A

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28 Jun 2006 17:15 #57871 by wireman
Replied by wireman on topic help with term
no,no its one of those fancy new exercise machines works the thys and rists at the same time,i think griz bought one which im sure he will be happy to post!;) what?:P

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28 Jun 2006 20:19 #57944 by loudhvx
Replied by loudhvx on topic help with term
Thyristor is a general name for any of several devices in a family of semiconductor devices made from 4 layers of Silicon. (Transistors have 3 layers and diodes have 2.)

The thyristor used in regulators (for permanent magnet alternators only) are SCR's (silicon controlled rectifiers). The SCR is not used as a rectifier even though it can. It has a more specialized application. Common diodes are what are used in rectifiers.

The SCR is the main device, but certainly not the only device, in a regulator. (Actually, 3 phase uses 3 SCR's and single phase uses 2 SCR's, typically).

Often, a diagram may only show the SCR to represent a regulator, but, in fact, there are more components implemented that are not shown.

By the way, the British are not known for their electrical engineering expertise in automotive applications.

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29 Jun 2006 07:04 #58025 by wiredgeorge
Replied by wiredgeorge on topic help with term
Michael - the book is a Haynes pub... it is in the shop right now... found my first error in the book yesterday bwhahahaha

They test a Kaw volage regulator (not on a running bike) using a multimetern in Ohms scale. They put probes on black and brown wires out of the voltage regulator and get 1050 Ohms in one direction and 300 in the other. I tested BOTH voltage regulators on my carb test bikes where they have been service for years and work fine in a running test (under 15VDC at 4K rpm) and both showed 1050 OHMS IN BOTH DIRECTIONS!

Anyway, the Haynes book called "Motorcycle Electonics Techbook" has lots of Kaw related stuff. I bought it from:
Whitehorse Gear
customer service 603 356 6556
catalog requests 603 356 6633
email: CustomerService@whitehorsegear.com
internet www.whitehorsegear.com

wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!

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29 Jun 2006 07:10 #58027 by trippivot
Replied by trippivot on topic help with term
very good loudhvx you are right on the money . the KZ's have 3 phase full wave permenant magnet systems. featuring a delta wound stator.full wave rectification and a regulator that gates excessive current to ground I like to add that the term of dynamo is used as the stator but I understand the dynamo to be both the stator and rotor as a team.. dynomite!!

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29 Jun 2006 07:44 #58036 by Duck
Replied by Duck on topic help with term
loudhvx wrote:

Thyristor is a general name for any of several devices in a family of semiconductor devices made from 4 layers of Silicon. (Transistors have 3 layers and diodes have 2.)


The thyristors name is homage to the thyratron .

Thyratron + Transistor = Thyristor

thyra, greek for door
tron, as in electron

thyratron = door for electrons

little doubt the term 'gate', given to the controlling terminal on field effect transistors, was a thematic choice.

Post edited by: Duck, at: 2006/06/29 10:45

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