What is the primary function of a relay in motor control systems?

In motor control systems, a relay primarily functions as an electromechanical switch that controls the operation of motors based on input signals. When an input signal is received, the relay activates or deactivates, allowing it to turn the motor on or off. This function is crucial for automating processes where motors need to start, stop, or change direction in response to various conditions or commands from a control system.

Relays can respond to low voltage signals, making them essential for safely controlling high-power motors without direct human intervention. They provide isolation between the control circuit and the motor circuit, enhancing safety and reliability. This capability allows for precise control over motor functions, which is vital in many industrial and commercial applications.

In contrast, supplying power to the motor, measuring speed, and maintaining torque are not primary relay functions. These tasks are typically managed by other components in a motor control system. Thus, the correct understanding of a relay's role emphasizes its importance in controlling motor operations effectively.