Importance

Loading Importance Indicators...

Abstract

An oil-filled submersible capacitor-start induction motor for operating a submersible pump includes an integrated capacitor/switch unit releasably secured to the lower end. The motor includes an outer tubular shell with spaced radial rotor bearings and with the housing extending downwardly of the lower bearing to an end bell. A diaphragm unit is secured to the end bell to balance the well pressure and internal oil pressure. The upper end cap includes a three-wire connector to receive a two-wire or a three-wire power cable. The lower end bell is generally cup-shaped and has a three pin connector. The capacitor/switch unit includes a sealed cylindrical housing which fits in the motor end and includes the capacitor and a triac connected to a three-terminal connector including capacitor terminals and a gate terminal. A sealing plug is adapted to be releasably attached to the bottom connector. The sealing plug includes a shorting clip connecting the capacitor terminals and thereby connecting the motor winding to the top connector to receive a three-wire cable with a capacitor and switch at the upper end of the motor. The capacitor/switch unit may be formed as a relatively thin, elongated unit located above the motor-pump unit within the well and incorporated directly into the power cable with a two-wire plug-in connection to the power cable and a three-wire output to the motor. A donut-shaped capacitor may also be mounted within the motor adjacent the stator winding and a triac mounted on the capacitor and hardwired in circuit.

Loading the Abstract Image...

First Claim