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how does a motorcycle regulate its charge

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buddy
Trackday Trickster



Joined: 07 Mar 2009
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PostPosted: 15:14 - 20 Aug 2024    Post subject: how does a motorcycle regulate its charge Reply with quote
A car alternator does not use permanent magnets so it can whizz round and produce no voltage if required. A motorcycle uses permanent magnets, so how is charge regulated?
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 15:42 - 20 Aug 2024    Post subject: Re: how does a motorcycle regulate its charge Reply with quote
buddy wrote:
A car alternator does not use permanent magnets so it can whizz round and produce no voltage if required. A motorcycle uses permanent magnets, so how is charge regulated?


It uses a regulator....
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Pete.
Super Spammer



Joined: 22 Aug 2006
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PostPosted: 17:30 - 20 Aug 2024    Post subject: Re: how does a motorcycle regulate its charge Reply with quote
buddy wrote:
A car alternator does not use permanent magnets so it can whizz round and produce no voltage if required. A motorcycle uses permanent magnets, so how is charge regulated?


Depends on the type but basically it either dumps electrical energy to ground (the chassis) and uses a heat sink to dissipate the energy or it open-circuits the alternator windings to remove the load.
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struan80
World Chat Champion



Joined: 04 Nov 2014
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PostPosted: 18:13 - 20 Aug 2024    Post subject: Reply with quote
Is it capacitor charge/discharge that keeps the induced stator output voltage even? Diode's change AC to DC which charges the battery and provides electrics when running.

This is my mad theory, without research. not based on any knowledge of anything motorbike like or my personal reality. Laughing I used to test Transformer rectifiers about 40 years ago. . Simpe IR and resistance measurement.
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Robby
Dirty Old Man



Joined: 16 May 2002
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PostPosted: 18:52 - 20 Aug 2024    Post subject: Reply with quote
struan80 wrote:
Is it capacitor charge/discharge that keeps the induced stator output voltage even? Diode's change AC to DC which charges the battery and provides electrics when running.



Not as far as I know. It's 3 phase AC output being rectified to DC by 3 different diode pairs. You get a fairly stable voltage because it's 3 phase and has a battery. So no need for capacitors, the battery does that job.
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blurredman
World Chat Champion



Joined: 18 Sep 2010
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PostPosted: 08:09 - 21 Aug 2024    Post subject: Reply with quote
So many different answers can be given.
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Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S, 1979 MZ TS150.
Current: 1973 MZ ES250/2 - 18k, 1979 Suzuki TS185ER - 10k, 1981 Honda CX500B - 91k, 1987 MZ ETZ250 (295cc) - 40k, 1989 MZ ETZ251 - 50k.
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buddy
Trackday Trickster



Joined: 07 Mar 2009
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PostPosted: 15:33 - 21 Aug 2024    Post subject: Re: how does a motorcycle regulate its charge Reply with quote
Pete. wrote:
buddy wrote:
A car alternator does not use permanent magnets so it can whizz round and produce no voltage if required. A motorcycle uses permanent magnets, so how is charge regulated?


Depends on the type but basically it either dumps electrical energy to ground (the chassis) and uses a heat sink to dissipate the energy or it open-circuits the alternator windings to remove the load.


Nice, does it open circuit the alternator at a high frequency like a switching power supply?
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buddy
Trackday Trickster



Joined: 07 Mar 2009
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PostPosted: 15:34 - 21 Aug 2024    Post subject: Re: how does a motorcycle regulate its charge Reply with quote
Nobby the Bastard wrote:
buddy wrote:
A car alternator does not use permanent magnets so it can whizz round and produce no voltage if required. A motorcycle uses permanent magnets, so how is charge regulated?


It uses a regulator....


what kind?
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 21:05 - 21 Aug 2024    Post subject: Re: how does a motorcycle regulate its charge Reply with quote
buddy wrote:
Nobby the Bastard wrote:


It uses a regulator....


what kind?


Usually either a zenner diode or a mosfet transistor circuit. Older ones tend to use the shunt type with a zenner. Newer/more expensive ones tend to use a mosfet.

There are some bikes that use a field coil alternator with a switched regulator, more like a car alternator but they are much less common. More common in European bikes but the odd Japanese one has them too, usually older models. I've had a few bikes where it was even an old-school electromechanical regulator.
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