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

vendredi 8 mai 2020

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

  Can I Help You       vendredi 8 mai 2020
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


لتحميل الكل في ملف واحد يجب ان يتوفر لديك تطبيق winrar في جهازك لفتح هذه الملف.


Pour télécharger le tout dans un seul fichier, vous devez avoir installé l'application winrar sur votre ordinateur pour ouvrir ce fichier.
Télécharger winrar pour les smartphones





Téléchargez tout les Cours zip(.rar)

Data

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.

logoblog

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

Previous
« Prev Post

Aucun commentaire:

Enregistrer un commentaire