References // Automatic assembly and adjustment machine for squirrel cage induction motors (domestic appliance industry)
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| Automatic assembly and adjustment machine for squirrel cage induction motors (domestic appliance industry) |
Domestic appliances such as refrigerators and laundry dryers should essentially meet the following requirements for end customers: Quality must be good (e.g., quiet run), and the price must be low. This naturally has an effect on the modules used. The drive is an important core component of these appliances. Squirrel cage induction motors with a relatively low speed are used.
These special motors need a very small and even air gap (02. +/- 0.04 mm) in order to reach their performance parameters. Such tight tolerances can only be achieved if the individual parts are manufactured with the corresponding accuracy. This, in turn, stands in contradiction to the price of the motors. This problem can be solved by adjusting, and thus precisely mounting economical individual parts with wide tolerances in an automated assembly cell. Manufacturing tolerances can be compensated for in this way. The plant described is used for assembling, adjusting and testing dryer motors. It comprises two manual work stations, press, adjustment and screw-driving unit, and a testing station with a separate control cabinet. The motors are assembled manually at the first manual work station. The two end shields and the stator are pressed together in the press. The bearings are pressed into their seats here. At the next station, the air gap is adjusted and the motors are screwed together. The motor, with the shaft upwards, is pressed against a pressure pad from below by a centring and lifting unit. The stator is gripped by a gripper, which is located on an xy-table, and the armature is set in rotation by a direct current motor. The gripper moves the stator with two stepper motors in the x and y directions until the armature rubs the stator, which is indicated by a current increase in the DC motor.
The speed of the motor is also monitored. The positions thus determined enable the stator to be adjusted exactly. After adjustment, the end shields and the stator are screwed using the servo screwdrivers. The motor is tested in the next station. The following tests are made: high-voltage test, apparent current test, noise test and speed measurement at undervoltage and rated voltage. After testing, the motor is replaced on the belt and fed to the second manual work station. At this station, the adhesive label bearing the test results is applied, and the motor is then taken from the belt and packed.
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