The six-lead motor is wound in such a way that the windings may be linked in either a Wye or a Delta configuration (see Figure 2). A Wye connection is formed when leads T4, T5, and T6 are linked together and power is provided to leads T1, T2, and T3. A Delta connection is formed when only leads T4 and T6 are linked together and power is provided to leads T1 and T2. The term "six-lead" refers to the number of connections required to reach all parts of the winding.
Since six-lead motors can be wound in either a Wye or a Delta configuration, they are suitable for use where it is necessary to have equal numbers of rotations from each end. This is usually the case with appliances that require toothed belts or similar devices which will not operate if there is not an even number of rotations coming from either end of the motor.
Six-lead motors are less common than three-or five-lead motors, but they do exist. They are used mainly by manufacturers who want to provide users with two identical motors in one package without having to increase their production costs.
The most common six-lead motor is the Delta type, which has only two external connections for leads T4 and T6. These motors are often called "twin Delta" motors because they look like two adjacent Delta motors stuck together.
Before we begin, let's go over how the windings of a conventional six-lead, three-phase motor are linked to incoming electricity. The six-lead stator is the simplest to comprehend, and understanding how it is connected is critical for our consideration of various beginning approaches. Schemes for connecting dual-voltage motors are depicted in Figure 1. Since these motors will have two sets of winding connections, they require some means of determining which set goes with which pole. This is usually done by marking one set of leads as "A" and the other set as "B". A common practice is to connect the black lead of Phase A to A++, the white lead to B+, and the red lead to B-. This assigns a polarizing function to each set of leads, so that if any lead from any phase is attached to a wire inside the motor case, it will not cause the motor to run incorrectly.
Three-phase motors are wired in a similar manner to six-lead motors, except that there are now three groups of leads (called "phases"). These are named A, B, and C. The exact assignment of wires to leads depends on what type of connector is used to link the motor to its surrounding infrastructure. If the connector has pins of equal length, then they can be inserted into holes in the base plate of the motor in any order and still work properly. However, if one pin is longer than the others, then it should be placed in a hole first, and the shorter pins followed in consecutive order.
Connect motor leads 1 and 2 to L1 (usually black), L2 (often red), and L3 (typically black). Connect the remaining motor leads (4, 5, and 6). Don't connect 4, 5, and 6 together to achieve the delta start for a six-lead motor. It is straightforward to run a three-phase motor on single-phase electricity. The same is not true of a six-lead motor; it must be started from each phase separately.
Wiring a two-pole, four-slot motor is very similar to wiring a four-pole, two-slot motor. In either case, you should connect leads 1 and 2 to one pair of slots, 3 and 4 to another pair of slots, and so on. However, because two-pole motors have only two external poles, they need only two sets of wires - one set to connect lead 1 to slot 1, lead 2 to slot 2, and so on; the other set of wires to connect lead 3 to slot 3, lead 4 to slot 4, and so on.
For example, suppose you were to wire a two-pole, four-slot motor using the diagram below. You would connect leads 1 and 2 to slot 1, 3 and 4 to slot 2, and so on. This would leave leads 3 and 4 open. If you wanted to drive this motor from a single power source, you would need to connect a wire from the source to lead 3 and lead 4 simultaneously.