3 phase motor symbol

About these 3 phase motor symbol

A three-phase motor is a popular electrical device used in industry and commercial applications. It is efficient and powerful. It runs on three-phase AC, which has a constant energy supply, guaranteeing the motor's performance. You must understand the relevant symbols to install, maintain, or troubleshoot these motors.

Depending on the structure, the symbol of a three-phase motor mostly includes three arcs or lines connected in a triangular form. They correspond to the three electrical phases. This symbol shows how the motor is wired and functions in an electrical circuit.

Other symbols include winding connections, which indicate how the motor's windings connect to the source, such as the Delta (Δ) or Wye (Y). These symbols guide the technicians toward the right wiring configuration and compatibility in the system.

Three-phase power supply

The symbol for a three-phase electrical power supply is a triangle made of three interconnecting phase lines. It shows the three phases of AC for motors. This setup ensures optimal power distribution.

Star connection

A triangle with a common vertex represents a star connection. It indicates the motor winding connection in the star (WYE). It minimizes inrush current during the motor pick.

Delta connection

The symbol shows a delta connection, ideal for running motors at full power and high torque. It represents each corner with a phase. This configuration is perfect for intensive use.

Motor windings

The symbol with three horizontal coiled lines represents the motor's three-phase coil layout. It also mirrors the motor, which is vital for smooth movements.

Grounding symbol

The grounding symbol is represented by a downward triangle of lines. It ensures that the grounding of the motor avoids electric shock or damage. Grounding is vital for safety. It must meet electrical engineering standards.

Overload protection

A coil with a line straight through it represents the motor's protective measuring instruments. This includes devices like thermal relays or fuses. They protect the motor from high temperatures and long-lasting high currents.

Direction of rotation

The upward-pointing triangle indicates motor rotation. It can be reversed by swapping any two phases. This rotation is crucial for the motor's efficiency, mechanical alignment, and machine performance.

Motor start capacitor

A pair of horizontal lines inside a circle or rectangle represent the starting capacitor, which helps the motor at startup. It provides enough torque to counter the initial resistance of most loads.

Phase sequence indicator

A symbol with three arrows or the letters R, S, T, L1, L2, and L3 shows the correct motor rotation sequence. Proper phase sequencing prevents issues like reverse rotation.

Motor terminal box

The motor terminal box is a rectangle with several input lines. It shows where the supply cables connect. It also shows where to make electrical connections and fix faults.