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Universal Electric Motor Internal Wiring Diagram

Single Phase Electric Motor Diagrams

Dear Mr. Electrician:  Where can I find single-phase electric motor diagrams? Answer:  I have compiled a group of single-phase electric motor diagrams and terminal connections below.  At the bottom of this post is a video about DC shunt motors. NOTE: Some text links below go to applicable products sold on Redbubble, Amazon, and eBay.  As an Amazon Associate, I earn from qualifying purchases.  Using my links helps to keep this website FREE. Table of Contents: TERMINAL CONNECTIONS FOR CAPACITOR START MOTORS ELECTRIC MOTOR DIAGRAMS SPLIT-PHASE INDUCTION MOTOR SPLIT-PHASE PERMANENTLY CONNECTED CAPACITOR MOTOR SPLIT-PHASE CAPACITOR START MOTOR SPLIT PHASE CAPACITOR-RUN MOTOR ANOTHER SPLIT-PHASE CAPACITOR-RUN MOTOR SPLIT-PHASE CAPACITOR-RUN REVERSIBLE INDUCTION MOTOR REACTOR-START MOTOR SPLIT-PHASE SINGLE-VALUE CAPACITOR DUAL VOLTAGE MOTOR REPULSION MOTOR REPULSION-START MOTOR SHADED POLE MOTOR SKELETON-TYPE SHADED POLE MOTOR UNIVERSAL MOTOR MOTOR FRAME SIZES DC MOTOR INFORMATION TERMINAL CONNECTIONS FOR CAPACITOR START SINGLE-PHASE MOTORS The auxiliary winding switch connections must be made so that both auxiliary windings become de-energized when the switch opens. Top Of Page ELECTRIC MOTOR DIAGRAMS Internal Wiring Diagrams of Small and Fractional Horsepower Electric Motors SPLIT PHASE INDUCTION SINGLE PHASE MOTOR DIAGRAM The Split Phase Induction Electric Motor has a squirrel-cage rotor for constant speed operation.  It has a starting winding of high resistance, which is physically displaced in the stator from the main winding. In series with the starting winding is a centrifugal starting switch, which opens the starting circuit when the motor has attained approximately 75 to 80 percent synchronous speed.  The function of the starting switch is to prevent the motor from drawing excessive current and protect the starting winding from excessive heat.  The motor may be started in either direction by reversing the main or the auxiliary (Starting) winding. These motors are suitable for oil burners, blowers, business machines, buffing machines, grinders, etc. SPLIT PHASE PERMANENTLY CONNECTED CAPACITOR MOTOR A Split Phase Permanently Connected Capacitor Electric Motor also has a squirrel-cage rotor with a main and starting winding.  A capacitor is permanently connected in series with the auxiliary winding.  Motors of this type start and run with a fixed capacitance value in series with the starting winding. The motor obtains its starting torque from a rotating magnetic field produced by the physically displaced two stator windings.  The main winding is connected directly across the line, while the auxiliary or starting winding is connected to the line through the capacitor, giving an electrical phase displacement. This motor is good for directly connected drives requiring low starting torque, such as fans, blowers, and some pumps. Top Of Page SPLIT PHASE CAPACITOR START MOTOR A split-phase capacitor starter electric motor may be defined as a form of a split-phase motor having a capacitor connected in series with the auxiliary winding.  The centrifugal switch opens the auxiliary circuit when the motor reaches 70 to 80 percent of synchronous speed. It is also known as a capacitor-start, induction-run motor. The rotor is a squirrel cage. The main winding is connected directly across the line, while the auxiliary or starting winding is connected through a capacitor, which may be connected to the circuit through a transformer with suitably...