How to recognize if an alternator is single or three phase
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Re: How to recognize if an alternator is single or three ph
Single-phase has 6 poles visible inside the "bore" of the stator and the three-phase has 9.
A stator with three wires doesn't necessarily mean it is three-phase, and if two are apparently joined (green/yellow & green/black?), then it is unlikely to be three-phase. Are there any numbers stamped on the metal stator frames?
pierodn said:
Single-phase has 6 poles visible inside the "bore" of the stator and the three-phase has 9.
A stator with three wires doesn't necessarily mean it is three-phase, and if two are apparently joined (green/yellow & green/black?), then it is unlikely to be three-phase. Are there any numbers stamped on the metal stator frames?
Re: How to recognize if an alternator is single or three ph
Dear Les,
my three LUCAS alternators have all six poles inside but not the same numbers.
One has n. 47205A1070, 2 wires;
Second has n. 47204, 3 wires;
Third, no number, 2 wires .
May be the 47205 is a 12 VOLT, 10 AMP ?
If i mount a new Boyer powerbox maybe is better to buy a new alternator? but is better 1 or 3 phases, and how much AMP?, in case, please, let me have a name of the new alternator's company.
Regards.
Ciao.
Piero
Dear Les,
my three LUCAS alternators have all six poles inside but not the same numbers.
One has n. 47205A1070, 2 wires;
Second has n. 47204, 3 wires;
Third, no number, 2 wires .
May be the 47205 is a 12 VOLT, 10 AMP ?
If i mount a new Boyer powerbox maybe is better to buy a new alternator? but is better 1 or 3 phases, and how much AMP?, in case, please, let me have a name of the new alternator's company.
Regards.
Ciao.
Piero
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Re: How to recognize if an alternator is single or three ph
RM21 stator = Standard Commando.
RM 19 = Pre-Commando. 6V Stator. When the green/yellow and green/black stator wires are connected, it operates as a 12V two wire stator.
If you expect to do a lot of low speed riding or have a brighter than standard headlamp or additional electrical accessories then perhaps a three-phase alternator may be worth considering, however, the RM21 may prove perfectly adequate?
Replacements are available from "Lucas", Sparx, or Wassell.
pierodn said:
RM21 stator = Standard Commando.
pierodn said:
RM 19 = Pre-Commando. 6V Stator. When the green/yellow and green/black stator wires are connected, it operates as a 12V two wire stator.
Pattern? RM21? RM23?pierodn said:
Yes. RM21pierodn said:
pierodn said:
If you expect to do a lot of low speed riding or have a brighter than standard headlamp or additional electrical accessories then perhaps a three-phase alternator may be worth considering, however, the RM21 may prove perfectly adequate?
pierodn said:
Replacements are available from "Lucas", Sparx, or Wassell.
Re: How to recognize if an alternator is single or three ph
Now I am confused :!:
I thought that all alternators were of 3 phase output, otherwise why have they got to have a rectifier fitted to convert the electric output to 12 volts :?:
L.A.B. said:
Now I am confused :!:
I thought that all alternators were of 3 phase output, otherwise why have they got to have a rectifier fitted to convert the electric output to 12 volts :?:
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Re: How to recognize if an alternator is single or three ph
Why do you think that?
You seem to be confusing three-phase with AC, as it's the the rectifier's job to convert AC (Alternating current) to DC (Direct current).
Bernhard said:
Why do you think that?
Bernhard said:
You seem to be confusing three-phase with AC, as it's the the rectifier's job to convert AC (Alternating current) to DC (Direct current).
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Re: How to recognize if an alternator is single or three ph
The rectifier converts AC single phase (two winding wires - or dual phase (3 winding wires) phase) to DC. A regulator then sets the voltage. These functions are usually combined in a single device but they are two different operations. First the alternator's AC voltage is converted to DC by the rectifier and then the output DC voltage is adjusted by the regulator. If it was not regulated, the voltage would rise uncontrollably with RPM and burn out the elec system.
The rectifier converts AC single phase (two winding wires - or dual phase (3 winding wires) phase) to DC. A regulator then sets the voltage. These functions are usually combined in a single device but they are two different operations. First the alternator's AC voltage is converted to DC by the rectifier and then the output DC voltage is adjusted by the regulator. If it was not regulated, the voltage would rise uncontrollably with RPM and burn out the elec system.
Re: How to recognize if an alternator is single or three ph
I am fully aware of the AC & DC output, but I have another question regarding the later 2 wire alternators, to achieve the higher watts output, do they wind extra copper windings around the coils :?:
I am fully aware of the AC & DC output, but I have another question regarding the later 2 wire alternators, to achieve the higher watts output, do they wind extra copper windings around the coils :?:
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