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    What is the difference between a two speed single winding and two speed two winding starter?

    Issue:
    What is the difference between a two speed single winding and two speed two winding starter?

    Product Line:
    8810 Multispeed Magnetic Starters

    Environment:
    Products sold and used in the United States

    Cause:
    Selecting a two speed starter

    Resolution:

    Multispeed motors are available in two basic versions:

    1) separate winding, and 2) consequent pole. A separate winding motor has a winding

    for each speed while a consequent pole motor has a winding for every two speeds

    (three-speed motors have two windings). The motor connections (and thus the types of

    controllers) for two speed starters are exemplified by the schematic diagrams shown in

    Table 16.22. Note that consequent pole two-speed controllers involve a 5-pole and a 3-

    pole starter, while separate winding controllers have two 3-pole starters.

    Verify the type of motor before ordering. Field modification of starters to match the

    motor may not

    be possible.

    Separate winding motors are usually chosen when flexibility is important, since the

    speeds of a consequent pole motor are usually limited to a 2/1 ratio; a broad range of

    speeds can be obtained on a separate winding motor.

    Both separate winding and consequent pole motors are available in three types:

    1) constant horsepower, 2) constant torque, and 3) variable torque. Table 16.21 shows

    typical applications for these different types of motors.

    NOTE: For detailed information involving the technical aspects


     

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