Triang X337 Motor Bogie

I don't know the part numbers of Tri-ang motor bogies without digging out old service sheets, but:

- Flip the magnet end for end, or

- the brush tension spring is earthed to the chassis. One arm has a thin insulating tube over the wire where it touches the brush arm, and a creased brass spade terminal which sits between spring and brush arm. Move the insulating tube and terminal across to the other brush. If this leaves the attached wire in an alkward position the problem was that someone put the magnet in backwards - return to first fix.

This would be a good time to have the magnet remagnitised by your local friendly instrument maker/repairer.

Greg.P.

The magnets being on the wrong side seems the best bet as I have stripped these motors down some time ago. Will give it a try.

Andy

Hi Andy,

Reverse the magnet on one of the bogies.

One problem you might come across when fitting two power bogies is, one motor might run faster than the other. It's trial and error in finding two that will run at the same speed.

Wilson

Can these be wired in series? I did that some years back with an American Bachmann diseasel switcher. Both motors will start at the same time and it will be much more controllable at the expense of halved top speed.

Back in the days before modern control systems, electric locomotives and tramcars used to start off in series, with the driver putting it in parallel once they had got up to speed.

Of course with four motors they started off with all four series, then two series-pairs in parallel, then all four parallel.

G'day, Do be careful when flipping your magnet not to lose contact with the metal poles. If you do you will weaken the magnet and will need a remag.

There were several series notches on the controller, followed by parallel ones. The driver had to be careful not to notch up too quickly or he would blow the circuit breaker (usually over his head) with a loud bang. In the

1930s, automatic acceleration systems were developed and applied in PCC streetcars, VAMBAC trams, subway trains and trolleybuses; the driver just pressed the pedal or turned the control handle and the notching up was done automatically. In the 1970s, thyristor control was introduced, in which an AC waveform is "chopped" to control power to the motors.

Thyristors aren't much use on smooth DC systems or even on sine wave DC systems with lots of trams, locos etc feeding back to the overhead supply.