What is the difference between a two speed single winding and two speed two winding starter?
8810 Multispeed Magnetic Starters
Products sold and used in the United States
Selecting a two speed starter
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
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