Metal working – Method of mechanical manufacture – Electrical device making
Patent
1995-09-26
1998-04-21
Hughes, S. Thomas
Metal working
Method of mechanical manufacture
Electrical device making
29605, 29705, 29709, 29732, 156169, 1562742, 1563796, 324546, 324772, H02K 1504
Patent
active
057406006
ABSTRACT:
Apparatus (10) and method for bonding together coils of an electrical wire forming windings (W) of a stator assembly (54) employed in making an electric motor. The apparatus includes a fixture (22) on which the stator assembly is installed during a bonding operation, the fixture also holding the stator assembly during a surge test which precedes the bonding operation. Electrical connectors (38) are used to electrically connect the stator windings to the apparatus, and these electrical connections are used for both the surge test and the bonding operation. A power supply unit (16) is responsive to an indication that the stator windings have successfully passed a surge test to apply a predetermined voltage to the windings. The current flowing through the stator windings as a result of the applied voltage is measured. A bonding control unit (50) controls the bonding operation. The control unit calculates the winding resistance as a function of the applied voltage and measured current, and adjusts the applied voltage to a level at which a predetermined current flows through the windings. This current heats the windings to a temperature at which a temperature activated adhesive material applied to the wires is activated. The material, when so activated, bonds the wires together.
REFERENCES:
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patent: 4087712 (1978-05-01), Mosimann et al.
patent: 4388371 (1983-06-01), Bolon et al.
patent: 4436988 (1984-03-01), Blumenkranz
patent: 5412362 (1995-05-01), Ikeuchi
patent: 5547532 (1996-08-01), Wernerbach, Jr. et al.
Emerson Electric Co.
Hughes S. Thomas
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