Boyer Brandsen Power Box

pierodn · Nov 7, 2013

Hi,
I have a 2 Phase Boyer Brandsen Power Box.
Can i use it on Commando? or the standard is singol or three phases?.
Ciao.
Piero

JimC · Nov 7, 2013

What is a 2 phase power box? Alternators are either single phase or three phase. Two wires coming from the alternator make it a single phase. Three wires from the alternator make it a three phase.

pierodn · Nov 7, 2013

JimC said:
Three wires from the alternator make it a three phase.

Hi Jim,

I do not agree.

The phase dont depends from the numbers of the wires: single phase has six faces into the alternator, three phase has nine faces into.

I have this biphase power box: i dont know where are it coming from and i would to know if it works for a Commando.

Ciao.

Piero

JimC · Nov 7, 2013

The faces you refer to are individual poles, which coils are wrapped around. Depending on how the coils are connected determines the number of phases. As for Nortons, this http://www.oldbritts.com/11_068100.html may help.

I don't know what a bi-phase power box is. I see Boyer lists one. Failing anyone on this forum with knowledge of the bi-phase power box, I would contact Boyer. They can answer any questions you may have.

L.A.B. · Nov 7, 2013

pierodn said:
Hi,
I have a 2 Phase Boyer Brandsen Power Box.

The "Bi-phase three wire" BB Power Box is not suitable for a Commando as far as I'm aware.

Some Italian bikes (Moto Morini?) have Bi-phase alternators, I believe.

http://thexscafedotcom.wordpress.com/ca ... lternator/

As a rule of thumb Single phase power boxes are suitable for use with most British Bikes, pre 1975 with alternators two, or three wire. Bi phase are suitable for use with most Italian and French machines equipped with three wire alternators. Three phase will suit some British machines post 1975 with three wire alternators and the majority of Japanese three wire machines.

BB Bi-Phase
http://www.boyerbransden.com/pdf/PBOX109.pdf

comnoz · Nov 7, 2013

Bi- phase is the circuit normally used for power supplies using a full wave bridge and a center tapped transformer. The same circuit can be used with an alternator instead of a transformer.

The bi-phase boyer could not be used with a three phase alternator or a single phase alternator. Jim

JimC · Nov 7, 2013

Come to think of it, I have one of those bi-phase stators. I mistakenly bought it thinking it was a three phase stator. Will send for postage and a donut.

comnoz · Nov 7, 2013

JimC said:
Come to think of it, I have one of those bi-phase stators. I mistakenly bought it thinking it was a three phase stator. Will send for postage and a donut.

If it's a Lucas with three wires and it's not 3 phase then it is probably a dual single phase. One high current winding and one low current winding. One winding was used for lights alone. It was a way to get by without a voltage regulator. Jim

comnoz · Nov 7, 2013

Here is the circuit for a bi-phase supply.

JimC · Nov 8, 2013

comnoz said:
JimC said:

Come to think of it, I have one of those bi-phase stators. I mistakenly bought it thinking it was a three phase stator. Will send for postage and a donut.

Click to expand...

If it's a Lucas with three wires and it's not 3 phase then it is probably a dual single phase. One high current winding and one low current winding. One winding was used for lights alone. It was a way to get by without a voltage regulator. Jim

It is a lucas 3 wire, but not 3 phase. L.A.B. once identified it from the mfg. number stamped on the stator frame. The thing is in my totally cluttered garage, now. If anyone wants it, they can have it for the cost of shipping. Donut donation optional.

So, you are saying there is bi-phase and also dual phase? Bi-phase being a full wave rectifier, whereas, dual phase is a stator with two output coils? I'm assuming one output coil of the dual phase would go to a rectifier circuit and the other coil (likely a 12 volt) would supply A.C directly to the lighting circuit.

comnoz · Nov 8, 2013

JimC said:
comnoz said:

JimC said:

Come to think of it, I have one of those bi-phase stators. I mistakenly bought it thinking it was a three phase stator. Will send for postage and a donut.

Click to expand...

If it's a Lucas with three wires and it's not 3 phase then it is probably a dual single phase. One high current winding and one low current winding. One winding was used for lights alone. It was a way to get by without a voltage regulator. Jim

Click to expand...

It is a lucas 3 wire, but not 3 phase. L.A.B. once identified it from the mfg. number stamped on the stator frame. The thing is in my totally cluttered garage, now. If anyone wants it, they can have it for the cost of shipping. Donut donation optional.

So, you are saying there is bi-phase and also dual phase? Bi-phase being a full wave rectifier, whereas, dual phase is a stator with two output coils? I'm assuming one output coil of the dual phase would go to a rectifier circuit and the other coil (likely a 12 volt) would supply A.C directly to the lighting circuit.

The bi-phase was 3 wires. 1 common and two outputs. The 2 outputs were of opposite polarity. They were fed to a 2 diode rectifier to provide full wave output. They were still considered single phase.

The old Lucas 3 wire was two independent single phase alternators with a common lead. One winding supplied just enough currant to power the ignition and charge the battery. Since they rarely provide any excess voltage they were usually used without a voltage regulator. [zener diodes were not common until the mid 60's] . The second winding just powered lights -usually not rectified. Jim

Boyer Brandsen Power Box

pierodn

JimC

pierodn

JimC

L.A.B.

Moderator

comnoz

JimC

comnoz

comnoz

JimC

comnoz

Similar threads