Single-Phase Motors and Overload Relays

A single-phase motor is ideal for small loads. Its construction is simpler and less expensive to produce, and maintenance is minimal. Single-phase motors can last for years before they need repair. Most failures are the result of improper application. If you're not sure whether your motor is a single-phase or a three-phase one, take a look at the voltage reading on your multimeter. It should be between 208 and 230 volts.
Overload Relays: One important feature of an overload relay is that it detects overloads. If the current in a motor rises too high, the overload relay will trip the motor. Overload relays work by measuring the electromagnet of a coil and pulling it when it detects a high current. The overload relay is also designed with a time delay to prevent the motor from starting too quickly.
Single-phase AC supply: When the single-phase current passes through a single-phase motor's rotor, it creates two alternating magnetic fields inside the motor. The alternating current in each phase of the single-phase motor will cause the coils to alternate between north and south, and cause the rotor to rotate in a circular motion.
Single-phase motor: Single-phase motors have the advantage of using one power source rather than three. They can be used for smaller applications. The rotors are usually simpler and smaller in comparison to other motor designs. These motors can be either synchronous or induction. Single-phase motors are most commonly used in applications that don't require a three-phase supply.
waylead.com.cn