What is the most common type of motor starter used in refrigeration systems?

The most common type of motor starter used in refrigeration systems is the across the line starter. This type of starter connects the motor directly to the power supply, allowing full voltage to be applied immediately when the motor is started. This method is widely utilized due to its simplicity and low cost. It is particularly effective for smaller motors where inrush current is manageable and does not significantly affect the electrical system or the operation of other equipment.

Across the line starters are favored in refrigeration systems because they ensure immediate and full torque from startup, which is beneficial for compressors needing to reach operational speed quickly. This is important in refrigeration applications where reliability and efficiency are crucial.

The other types of starters serve specific purposes; for example, soft starters reduce the initial torque and inrush current, which can be beneficial in large systems to limit stress on electrical components but are less common in standard refrigeration setups. Star-delta starters are typically used for larger motors to reduce starting current but require more complex wiring and are not as prevalent in typical refrigeration applications. Variable frequency drives (VFDs) allow for speed control of the motor and are primarily used in variable load applications, making them less common for standard refrigeration systems that usually operate at a constant speed.