Noris Generator MLZa 6/45/60.

There are two different generators installed on the HOREX Reginas.
Until beginning 1954 there was the model NORIS MLZa 6/45/60 with nominal power of 45 Watt at 1800 rpm. installed.
On April 1954 HOREX changed to the model NORIS MLZa 60/6/1600 with nominal power of 60 Watt at 1600 rpm.
In the factory instruction KDM-W3 Generator "Noris" from 10.4.1954 HOREX advised, that the parts of the two models are not changeable against each other.

Carbon brush Typ NOX15 7x8x20mm.


HOREX factory instruction 1/54

Partnumbers of Noris generators.


Mechanical voltage regualtor.

I decided to change the mechanical voltage regualtor agianst a electronical one.
By this change i hope to increase the reliability of the elctrical system and to prevent the battery to overcharge.
After a research on the internet i found out, that my voltage regulator also isn´t the original one anymore.

Consider: with a electronical regulator to have a battery ist a must.


Schematic diagram Noris generator.

This is the electrical overview of the Noris generator with the mechanical voltage regulator.


Removal mechanical regulator.

At first i labeld and removed the leads from the mechanical regulator.


Installation electronic regulator.

Then i reconnect the leads corresponding to the installation manual to the electronic regulator.


Electronic regulator.

The three leads are connected to the terminals of the electronic regualtor.
Important! The earth is connected via the housing of the regualtor to the base plate, take care for a good connetion.
On my regulator the fourth terminal is not connected.


Regulating resistor.

The old mechanic regualtor needs a resistor to regulate the voltage.
This resistor is made by an resistive cable, which is added to the field winding.
One end of the resitive cable is connected to the regulator, the other one (yellow cable) to earth (see drawing).


Earth connection resitive cable.

The earth connection of the resistive cable has to be removed and isolated.
Warning! If the resistor is connected, the electronic regulator can get damaged.


Schematic diagram Noris generator with electronic regulator.

The diagram shows the disconnected resistor.




The seat of the alternator on the shaft is cone shaped.



The alternator is fixed on the conical part of the shaft.
Due to tighten the safety screw the alternator is pressed on the cone.


Removing tool for alternator.

To remove the alternator from the shaft without damage the special HOREX tool WH6 is required.
After removal of the safety screw this bolt is placed into the hole of the shaft. Then the safety screw is screwed in the shaft again until it is under pressure.
Normally the alternator isn`t removed by the pressure of the bolt only, because of its strong seat on the cone. Additionally a slight hammer stroke on the head of the screw is required.
In any case it is necessary to holt the alternator with one hand to prevent it form falling down.


Alternate removing tool.

Alternate it is also possible to use a screw as removing tool. The thread on the front of the screw has to be removed.
By selction of the screw it has to be observed to take one with high hardness degree. Otherwise it will bend under pressure.
Also the lengh of the threat on the screw is important because there is a threat in the alternator (for removal) and also in the shaft (to fix it). If the threat is to long, it will grip into the threat of the shaft an lock the alternator on it.




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