Abstract: An electrical motor comprises a stator 1 and a rotor 2, the stator 1 having poles 3 facing circumferential surfaces of the rotor 2 so that the stator 1 forms a magnetic circuit with the rotor 2. The stator 1 further has stator windings 5 grouped into two or more phase windings A, B, which phase windings are separately energisable to induce stator magnetic fields which interact with magnetic fields associated with the rotor 2. A voltage across a stator phase winding is detected by voltage detecting means.

Abstract: An electrical motor comprises a stator 1 and a rotor 2, the stator 1 having poles 3 facing circumferential surfaces of the rotor 2 so that the stator 1 forms a magnetic circuit with the rotor 2. The stator 1 further has stator windings 5 grouped into two or more phase windings A, B, which phase windings are separately energisable to induce stator magnetic fields which interact with magnetic fields associated with the rotor 2. A voltage across a stator phase winding is detected by voltage detecting means.

Abstract: An electrical machine comprises a four-pole stator 2 provided with a field winding 10 and an armature winding 11, each of the windings 10, 11 being split into two coils 22, 23 or 24, 25 closely coupled and wound so that diametrically opposite portions of both coils are disposed within diametrically opposite stator slots. A two-pole rotor (not shown) without windings is rotatable within the stator 2, and a circuit is provided for energising the armature coils 24 and 25 when direct current is supplied to terminals 26 and 27 of the circuit. Switches 28 and 29 in series with the coils 24 and 25 are switched alternately to effect alternate energisation of the coils 24 and 25 so as to generate, as a result of the opposite winding of the coils, magnetomotive forces in opposite directions.