Motor Circuit Diagrams

Sudden Braking of Three-Phase Asynchronous Motors Schematic Circuit Diagram

Three-phase asynchronous motors are comprised of two fundamental components: the stator and the rotor. The stator, which serves as the stationary part of the motor, includes a stator core and field windings. In the stators of three-phase asynchronous motors, there is a distinct winding for each of the three phases. On the other hand, the rotor constitutes the rotating element of the motor. In slip-ring asynchronous motors, the rotor features windings, while squirrel-cage asynchronous motors have short-circuited bars within the rotor. The prevalent type of asynchronous motor employed in industrial applications is the squirrel-cage asynchronous motor, and Volt Motor’s industrial asynchronous motor product lineup primarily comprises squirrel-cage asynchronous motors.

When the forward button is activated in this circuit, the contactor (I) becomes energized. Typically, the normally closed (I) contact opens, while the normally open (I) contacts close. Consequently, the motor commences its forward rotation. Simultaneously, the contact in the forward direction of the instant stop switch (A) closes. However, the contactor (G) remains unenergized as the normally closed contact (I) opens. The current (A) originating from phase (R) continually flows through the contact at the forward direction of the instant stop switch, traverses the upper contacts at the back, and interfaces with the normally closed (G) contact. This results in the motor sustaining its continuous forward rotation until the stop button is pressed.

Sudden Braking of Three-Phase Asynchronous Motors Schematic Circuit Diagram

Upon pressing the stop button, the contactor (I) loses its electrical supply and de-energizes. This action triggers the activation of the power circuit contacts (I), effectively disconnecting the motor from the main power source. Concurrently, the control circuit’s previously open contact (I) now closes.

As the rotor continues its forward rotation, the contact (A) in the forward direction of the instant stop switch remains engaged. It plays a pivotal role in energizing the current (G), which flows through the contact, as well as the normally closed (I) contact. This sequence results in the power circuit contacts (G) closing. By interchanging two phases, the motor is once again connected to the main power supply.

While the rotor is in forward motion, a counter-clockwise torque is generated, causing the rotational speed to rapidly decrease until it reaches zero. At this point, the momentary stop switch returns to its default position, prompting the (G) contactor to de-energize. Consequently, the motor swiftly halts its operation without transitioning into reverse rotation.


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