Slot-pole combination

In brushless motors, there are many possible combinations of the number of slots (or teeth) in the stator core and the number of magnetic poles of the rotor. Fig. (a) shows an outer-rotor type, with a combination of 18 slots and 14 poles, abbreviated as 18s14p. Combining this stator core with the rotor of (b) gives us 18s24p. (c) is an outer-rotor 12s8p type, but the method of forming the magnetic pole of the rotor is to use half the number of magnets to magnetic poles, which is called a consequent pole type. Consequent-poles can also be referred to as pseudo-poles. (d) is an inner-rotor 12s8p type. There are various possible winding methods depending on these combinations. (d) shows an example of this.