FIGURE 5.31 Popular 3-phase BLDC motor winding line connections: (a) wye (half wave), (b) wye (full wave), (c) delta, and (d) independent.
the neutral current is zero, and the line-to-line voltage is V3 times the phase voltage. In a balanced delta connection, the line-to-line and coil (phase) voltages are equal, but coil currents are 1/V3 times the line-to-line currents.
Key Winding Patterns. There are many types of winding patterns that can be utilized. Four major winding patterns are listed here:
1. Constant integral pitch—lap winding (full)
2. Variable pitch—concentric winding
3. Constant fractional pitch—lap winding for even or odd stator slots
4. Half-pitch
Each of these winding patterns has two coils per stator slot. There is one winding type designated, a consequent pole winding where there is only a single coil per slot. Consequent pole windings are very popular in single-phase ac motors of fractional-horsepower size.
Table 5.7 is revised from Veinott and Martin (1987). It displays the various sta-tor slot and rotor pole combinations along with the maximum number of parallel circuit combinations with a specific slot and pole combination. For purposes of simplicity, either 12- or 24-slot stators are used here to illustrate the various winding patterns. In one case, a 15-slot stator is used to illustrate an odd-slot fractional-pitch lap winding.
TABLE 5.7 Slots Versus Poles Versus Parallel Hookups Versus Coils per Pole per Phase
FIGURE 5.31 Popular 3-phase BLDC motor winding line connections: (a) wye (half wave), (b) wye (full wave), (c) delta, and (d) independent.the neutral current is zero, and the line-to-line voltage is V3 times the phase voltage. In a balanced delta connection, the line-to-line and coil (phase) voltages are equal, but coil currents are 1/V3 times the line-to-line currents.Key Winding Patterns. There are many types of winding patterns that can be utilized. Four major winding patterns are listed here:1. Constant integral pitch—lap winding (full)2. Variable pitch—concentric winding3. Constant fractional pitch—lap winding for even or odd stator slots4. Half-pitchEach of these winding patterns has two coils per stator slot. There is one winding type designated, a consequent pole winding where there is only a single coil per slot. Consequent pole windings are very popular in single-phase ac motors of fractional-horsepower size.Table 5.7 is revised from Veinott and Martin (1987). It displays the various sta-tor slot and rotor pole combinations along with the maximum number of parallel circuit combinations with a specific slot and pole combination. For purposes of simplicity, either 12- or 24-slot stators are used here to illustrate the various winding patterns. In one case, a 15-slot stator is used to illustrate an odd-slot fractional-pitch lap winding.TABLE 5.7 Slots Versus Poles Versus Parallel Hookups Versus Coils per Pole per Phase
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