Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-07-20
2001-12-11
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S06800R, C310S06700R, C029S596000
Reexamination Certificate
active
06329732
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to electric motors and, more particularly, to methods for assembling temperature sensors in electric motors.
Electric motors typically include a stationary outer portion, a stator, which surrounds an inner portion, a rotor, which rotates utilizing magnetic fields. The stator includes stator coils and stator windings, with each stator coil wound around a respective stator winding, for example U.S. Pat. No. 5,045,742. Electrical current flows through the stator coil in the respective stator winding in a time sequential manner, which generates a stator magnetic field that repels/attracts a rotor magnetic field. The electrical current flowing through the stator constantly changes in time and direction, resulting in a constantly changing stator magnetic field. Due to the changing current direction and a resulting rotating stator magnetic field of constant magnitude, the rotor is caused to rotate and generate mechanical energy.
As more electrical current is directed to the motor and increasingly changed, the rotor is caused to rotate faster. However, heat is generated by the motor due to simple resistive losses, generating counter electromagnetic forces, and hysteresis losses. If the generated heat is not adequately monitored and conducted away from the motor, the stator windings will overheat causing a breakdown of motor insulation and a permanent loss of the stator magnetic fields and the rotor magnetic field, which results in an inoperable motor.
The known methods and apparatus for monitoring temperature increase the cost and complexity of the electric motors. Further, the utilization of these known methods and apparatus lack a high degree of precision and accuracy. Due to implementation, some of these known methods and apparatus fail to accurately monitor a temperature increase in the motor.
BRIEF SUMMARY OF THE INVENTION
It is therefore seen to be desirable to embed temperature monitoring sensors in an electric motor. In an exemplary embodiment of the invention, the temperature monitoring sensors are positioned and attached to stator winding phases prior to insertion of these phases into a stator iron of the motor.
More particularly, the temperature monitoring sensors are eight millimeter sensors which include a face side, utilized to detect a temperature increase/decrease, and a lead side, utilized to convey this information to a motor controller. Proper positioning of the eight millimeter sensors along the stator winding phases is predetermined prior to assembly of the motor.
A temperature monitoring motor is provided at a reduced cost in comparison to known temperature monitoring methods and apparatus. In addition, the temperature monitoring motor provides accurate and continual temperature monitoring.
REFERENCES:
patent: 1947078 (1934-02-01), Cobb
patent: 2471840 (1949-05-01), Seely
patent: 3131322 (1964-04-01), Pleiss, Jr. et al.
patent: 4188553 (1980-02-01), Wheaton
patent: 4571518 (1986-02-01), Kintz
patent: 4807354 (1989-02-01), Capuano et al.
patent: 4926077 (1990-05-01), Gauthier et al.
patent: 5343613 (1994-09-01), Kintz
patent: 5635806 (1997-06-01), Wissmach et al.
patent: 5740600 (1998-04-01), Ransberry
ArmstrongTeasdale LLP
General Electric Company
Horton, Esq. Carl
Lam Thanh
Ramirez Nestor
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