Single-phase induction motor 4/6 pole common winding connection with

Abstract

A single phase alternating current four pole/six pole capacitor run induction motor is provided having a stator assembly including three coil groups, each of the coil groups having four coil sets. Each of the winding sets can change the direction of current flow in its half of the coil sets by reconnecting the coil sets either in parallel or in series. For high speed operation, the coil sets of group one are connected parallel with one another, and in series with the similarly parallel connected coil sets of group two. This arrangement defines a four pole main winding for the motor. A pair of the coil sets of group three are connected in parallel with one another, and defines the four pole auxiliary winding for the motor. In six pole operation, the coil sets of group one 1 are connected in series to parallelly connected coil sets of group three to define the six pole auxiliary winding. The serially connected winding group two is in series with half of the parallelly connected coil sets of winding group three, thereby defining the six pole main winding for the motor. As a result, all coils of the windings are shared by both operations. At both speeds, the main and auxiliary magnetic motive forces are symmetrically distributed and have a ninety electrical degree phase shift in space. The performance at either speed of the motor closely simulates that provided by a single speed capacitor run motor of the same size.