Klockner Moeller Electric Parts from KlocknerMoeller.net
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All about Motors
Pole-changing motors |
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| The speed is determined by the number of poles on induction motors. Several speeds can be obtained by altering the number
of poles. The usual types are: |
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The various tapped winding configurations give differential output ratios for the two speeds
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The /
 configuration comes nearest to satisfying the most usual requirement for
constant torque. It has the additional advantage that, because nine terminals are available, /
starting can be used to provide smooth starting or to reduce the starting current for the low speed condition (→ section
Motor windings). |
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The
/
is preferred for better matching of the motor to machines in which the
torque increases by a quadratic factor (pumps, fans, rotary compressors). Moeller multi-speed starters can be used for both types of
connection.
2 speeds – separate windings
In theory, motors with separate windings allow any combination of speed
and any output ratio. Both windings are arranged in connection
and are completely independent of one another.
Preferred speed combinations are:
The code numbers are prefixed to the main notations to denote increasing speed. Example: 1U, 1V, 1W, 2U, 2V, 2W. Comparable to EN 60034-8.
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