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#41
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555 Automotive regulator/AN170.
On Sat, 27 Nov 2010 17:14:37 -0000, "Ian Field"
wrote: I'm thinking maybe feed the field winding with a variable output buck regulator and include the battery in the voltage control loop. What do you think? Rectifiers aren't in alternator body? Is the output winding three phase or single phase? Its a 3-PH alternator with the rotor bolted on the end of the crankshaft - the rectifier/regulator pack is hidden under the tank somewhere. Linear produces heat/waste. You want to be switching the field on and off... PWM. There's no shielding of the wiring on the motorcycle like you'd have with a car body - pulsing the field might even cause an RFI nuisance. Bistable works just fine, you're just more likely to have radio "whine" that varies in pitch with RPM. I don't have a radio - but I pass plenty of houses that do. What is the resistance of the field? Your pass device must dissipate 49/Rf Watts at the worst-case point, if you go linear. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#42
Posted to alt.binaries.schematics.electronic
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555 Automotive regulator/AN170.
"Jim Thompson" wrote in message ... On Sat, 27 Nov 2010 17:14:37 -0000, "Ian Field" wrote: I'm thinking maybe feed the field winding with a variable output buck regulator and include the battery in the voltage control loop. What do you think? Rectifiers aren't in alternator body? Is the output winding three phase or single phase? Its a 3-PH alternator with the rotor bolted on the end of the crankshaft - the rectifier/regulator pack is hidden under the tank somewhere. Linear produces heat/waste. You want to be switching the field on and off... PWM. There's no shielding of the wiring on the motorcycle like you'd have with a car body - pulsing the field might even cause an RFI nuisance. Bistable works just fine, you're just more likely to have radio "whine" that varies in pitch with RPM. I don't have a radio - but I pass plenty of houses that do. What is the resistance of the field? No idea - its -5C outside and I'd have to unbolt the tank to get at the connector. Your pass device must dissipate 49/Rf Watts at the worst-case point, if you go linear. Thanks - I'll save that for when I research all the stuff I've downloaded and start putting pen to paper. The overcharging isn't drastically serious, maybe I can aim to deal with it when the weather warms up. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#43
Posted to alt.binaries.schematics.electronic
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555 Automotive regulator/AN170.
On Mon, 29 Nov 2010 16:44:25 -0000, "Ian Field"
wrote: "Jim Thompson" wrote in message ... [snip] Bistable works just fine, you're just more likely to have radio "whine" that varies in pitch with RPM. I don't have a radio - but I pass plenty of houses that do. What is the resistance of the field? No idea - its -5C outside and I'd have to unbolt the tank to get at the connector. Your pass device must dissipate 49/Rf Watts at the worst-case point, if you go linear. Thanks - I'll save that for when I research all the stuff I've downloaded and start putting pen to paper. The overcharging isn't drastically serious, maybe I can aim to deal with it when the weather warms up. [snip] It's cold here too: 46°F, but weather page claims "RealFeel®" of 34°F / 1.11°C :-( ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#44
Posted to alt.binaries.schematics.electronic
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555 Automotive regulator/AN170.
"Jim Thompson" wrote in message ... On Mon, 29 Nov 2010 16:44:25 -0000, "Ian Field" wrote: "Jim Thompson" wrote in message ... [snip] Bistable works just fine, you're just more likely to have radio "whine" that varies in pitch with RPM. I don't have a radio - but I pass plenty of houses that do. What is the resistance of the field? No idea - its -5C outside and I'd have to unbolt the tank to get at the connector. Your pass device must dissipate 49/Rf Watts at the worst-case point, if you go linear. Thanks - I'll save that for when I research all the stuff I've downloaded and start putting pen to paper. The overcharging isn't drastically serious, maybe I can aim to deal with it when the weather warms up. [snip] It's cold here too: 46°F, but weather page claims "RealFeel®" of 34°F / 1.11°C :-( Its forcast -20C for parts of the UK tonight and heavy blizzards sweeping inland down the east coast, normally a cold snap is never more than a few light flurries in November. We have 2 or 3 mild winters and the doom sayers start chanting "global warming", we have as many harsh (and early - its still officially autumn) winters and thay try to claim its local variation. |
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