Two-speed Motors: How do they work and can I use a soft starter to control them? |
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Soft starters can be applied to the two most common types of two-speed motor. In both cases, separate motor protection must be provided for low and high speed operation. Dahlander motors are special purpose motors often applied to two-speed compressor or fan applications. The motor windings are externally configured using contactors for high speed (dual star) and low speed (delta) operation. Dual-winding motors have two separate pole configurations (e.g. 4 pole / 8 pole) on a common shaft. Each pole configuration (speed) is selected using an external AC3 rated contactor.
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Technically the product is very good, the best on the market.
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