The starter for a consequent-pole two-speed motor requires a three-pole unit and a five-pole unit. Although these are always electrically interlocked, it may not be practical to provide mechanical interlocks on more than two starters. Additional units can be used for each speed. Starters for separate-winding two-speed motors consist of two standard three-pole starter units that are electrically and mechanically interlocked and mounted in a single enclosure. Motor windings in multispeed squirrel-cage motors may require special starters. Part winding and wye-delta starters can also provide reduced-voltage starting, although technically they are not reduced-voltage starters. Many starters apply reduced voltage to motor windings primary resistor, primary reactor, autotransformer, and solid state. In addition to load demands, power company regulations may limit the current surge or voltage fluctuation that can be imposed on the power supply during motor starting. Some machines or loads may require a gentle start and smooth acceleration up to full speed. Reduce-voltage, Single-speed Motor Starters Two other types, combination and reversing starters, consist of a starter, usually magnetic, with added functions. Single-speed squirrel-cage motors have starters that fall into two categories: full-voltage or across-the-line starters and reduced-voltage starters.įull-voltage starters (manual and magnetic) apply full voltage directly to motor terminals. Starter Motors Full-voltage, Single-speed Motor Starters
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June 2023
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