Montage et ajustement d'arbres, de roulements et de coussinets Électromécanique des Systèmes Automatisées-ESA-OFPPT-PDF

Montage et ajustement d'arbres, de roulements et de coussinets Électromécanique des Systèmes Automatisées-ESA-OFPPT-PDF
Montage et ajustement d'arbres, de roulements et de coussinets Électromécanique des Systèmes Automatisées-ESA-OFPPT-PDF

Montage et ajustement d'arbres, de roulements et de coussinets   ESA-OFPPT-PDF

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Control of artificial round or "ovality" of the collector.

It is done with a comparator whose base is supported on the brush holder or the flange of the motor.

The measuring tip remains on the head of a broom which will be versatile under the effect of a possible (oval) defect in the collector. The brush movement must not exceed 0.03 mm.

Roughness control of the collector lamellae

If a roughness controller is arranged, it must be checked that the condition of the surfaces of the collector lamellae are:

· From 1 to 1.8 µm for motors with power> 1.5 kW

0.5 to 1 m for motors with power <1.5 kW

Brush holder crown adjustment.

After replacing a collector, the position of the brushes must be adjusted if they are mounted on an adjustable crown. Place a voltmeter as on the diagram below (scale of a few volts).

Connect and disconnect a heap on the stator so as to generate an induced strain between the brushes of the collector, the motor driving in dynamo. The right position is obtained for a brush tension as low as conceivable.

Brush holder crown adjustment

Continuity check of a DC stator

It is done with the ohmmeter the two test probes being affixed between the focuses of associations of the terminal block. We must measure a few tens to a hundred ohms.

The standard insulation affinity to the stator frame must also be measured.

Insulation check


The insulation must be at least 5 M pour for a test strain of 100 volts (i.e. 5,000ω / volt)

Towers short circuit control

It is done with the engine disassembled with a tester (also called grognard). It is in fact a coil whose open magnetic mass closes by relation to the notches of the motor. A transformer is thus obtained, the rotor or stator coil being the secondary. A short circuit in a tower of this secondary increases the current of the primary which is signaled by a noise or an indicator light.

Renovation of a DC motor

In the event of renovation of a DC motor the following operations must be carried out in a specialized workshop:

Disassembly of the coupling present on the motor

· Removal of brushes and brush holder springs

· Complete disassembly of the engine and markings

· General cleaning and degreasing of mechanical parts

· Control and measurement of the tolerances of the bearing seats on the shaft and in the flanges

· Armature cleaning using an appropriate detergent

· Oven drying with forced air

· Electrical control of the rotor winding

· Winding continuity tests

· Measuring the value of insulation

· Search for bad welds from the winding to the collector

· Short circuit searches between towers, entry to controller (grognard)

Armature vacuum impregnation and oven varnish polymerization

· Rectification of the collector at the visit

· Milling of mica between blades and chamfering the blades

· Dynamic balancing of the armature on a balancing bench

· Cleaning of the windings of the head and auxiliary field

· Drying in a forced air oven

· Coil timing control and electrical winding control

· Varnishing the stator and armature windings with hostile red varnish to streak

· Replacement of bearings

· Repair and adjustment of brush holders - running in brushes

· Reassembly of the engine - fight tests or tests on a test bench

· Finishing and painting, reassembly of the coupling.

Tree control

The bending of the shaft is particularly to be watched, an excessively specialty load applied on the child end can generate a torque such that a bending evaluate occurs.

is induced and worn on the bearings or causes the rotor and stator to rub.

This bending results in a weakness of the shaft, a bad positioning of the brushes, an excessive exertion on the bearings according to an inappropriate edge and in extreme cases a contact between the magnetic sheets and the magnets.

Occasionally, the shaft deformation should be checked with a comparator. It is conceivable on certain motors to separate the axis of the rotor and to replace it. The tolerance will be from one to a few hundredths of a mm.


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