Dynamo repairs for Rolls Royce and Rolls Bentley
Having a great deal of experience with repairing and reconditioning heavy-duty alternators for the PSV industry and OEMs, we are extremely capable of restoring large and small dynamos used on vintage cars and bikes.
We specialise in repairing large dynamos such as the Lucas and Rotax dynamos used on Rolls Royce and Rolls Bentley, as well as dynastarts found on the Morris Oxford (Bullnose Morris).
We also repair and recondition a range of classic dynamos such as the Lucas C40 and C35, and motorbike dynamos - such as the E3L and its many variants.
Modern wires, insulations and resins
Our use of modern wires, insulations and resins and winding and connecting techniques means that our restored units are, very often, to a higher specification then the original and if, upon investigation, we discover that your armature or field coil is burned out we will recommend that you replace both components.
It is likely that both the armature and the field coil within your dynamo are of the same age; manufactured from the same original materials and using the same techniques. Although one may appear okay on a simple test - it could be about to fail.
Replacing both the armature and field will avoid a potentially costly false economy while being protected by an Armoto guarantee giving peace of mind of future reliability.
Higher output and more efficient dynamo
Modern wires and insulations are not as susceptible to moisture ingress and insulation breakdown, and they also have a higher safe operating temperature. Modern wires also take up less space. The insulation methods from the past meant that the coils in both the armature and the field coil took up a lot of room, e.g. the wire may be double-cotton covered and the whole coil then strapped in Indian cotton. The slot insulation would also be thick in comparison to today, which can be 40V/micron.
Higher cross section wire can be used. The overhang of the armature and field coils can also be reduced which means that the overall internal resistance of the dynamo can be reduced. The output from the unit can be higher and more efficient than was originally possible.
Voltage conversions
Voltage conversions are possible on most units. There is an advantage by having a higher voltage unit, as less energy is wasted in the wiring and contacts, and in most cases because new windings take up less space it is possible to use some of this liberated space to increase the cross sectional area of wire as well is number of turns.
3 to 2 Brush conversions
Three to two brush conversions are possible on all units, however a voltage regulator would also need to be added to the dynamo in order to control the output. Three brush dynamos work perfectly well but they are susceptible to seasonal conditions and it is necessary to adjust the brush position to achieve the optimum charge rate. They are also easier to burn out and they can boil the battery as there is no voltage regulator to cut them off. They do not however suffer from voltage regulator problems which are the cause of many failures.
Looking for a rewind, repair or recondition service? Contact us today!
