How to Change the Rotation on a Single Phase Motor

Written by neha tripathi | 13/05/2017

A single phase motor is generally an induction motor comprised of two main parts, a rotor and a stator. The stator is a permanent magnet while the rotor is an induced magnet that usually rotates inside the stator, supplying electric current. The motor's direction of rotation is controlled by the connections of the windings of the rotor and stator with respect to each other. The direction can be reversed by reversing the connections of the "start" or the "run" windings in the motor winding circuit.

Cu off the electricity supply to the motor. Remove the main fuse from the circuit.

Locate the winding terminal panel on the motor. Usually, for single phase motors, the terminal panel can be found as a box at the top end opposite to the shaft of the motor.

Unscrew the panel cover with a flathead or a Philips-head screwdriver, whichever is appropriate for the screws. Remove the panel cover to expose the winding terminal connections.

Identify the start windings connected to the terminals T5 and T6, black and violet in colour respectively. Find the start windings connected to the terminals T1 and T4, blue and yellow in colour respectively. You can reverse the connections of either the start windings or the run windings on the terminals for changing the direction of rotation.

Unlock the winding terminals T1 and T4 with a nut driver of appropriate size. Remove the windings from the terminals. Connect the windings of terminal T1 to terminal T4 and the windings of the terminal T4 to terminal T1. Tighten the nut.

Alternately, unlock the terminals T5 and T6 with the nut driver and swap the windings connected to the two terminals. Tighten the nuts with the nut driver.

Screw the panel cover back on the terminal connection panel with the screwdriver.

Replace the main fuse in the circuit and turn on the electricity supply to the motor. Start the motor and check the direction of rotation.

Things you need

  • Motor's operating manual (if available)
  • Philips-head and flathead screwdriver
  • Nut driver set

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