Patent ID: 6100620
Filing Date: 2000-08-08
Classification: H02K

Abstract:
A synchronous electrical machine comprising:(a) a stator including:(i) a first plurality of stator teeth disposed in a circle around a rotational axis, each of said stator teeth of said first plurality being at a respective azimuthal position on said stator, said first plurality of stator teeth including an integral number m, greater than 1, of first sets of said stator teeth of said first plurality, each of said first sets including a same number, greater than 1, of said stator teeth of said first plurality, said stator teeth of each of said first sets being separated azimuthally by a certain tooth pitch, said first sets being separated azimuthally by a set pitch different from said tooth pitch, and(ii) a second plurality of stator teeth including an integral number m', greater than 1, of second sets of said stator teeth of said second plurality, each of said second sets including a same number, greater than 1, of said stator teeth of said second plurality, said stator teeth of each of said second sets being separated azimuthally by a tooth pitch different from said tooth pitch of said first sets, said second sets being separated azimuthally by a set pitch different from said tooth pitch of said second sets; and(b) at least one rotor, coaxial with said stator on said rotational axis, said at least one rotor including a first plurality of rotor teeth disposed in a circle around said rotational axis, said rotor operative to rotate about said rotational axis among a plurality of rotational positions relative to said stator, so that in each of said plurality of rotational positions, an electrical phase difference between each of said stator teeth of said first plurality and an azimuthally nearest of said rotor teeth of said first plurality is a stepwise function of said azimuthal position of said each stator tooth of said first plurality.