Synchronous motor with flux conductor

Claim 2

A synchronous motor comprising a stator including a field portion and a coil portion disposed about the field portion, the field portion including a pair of spaced flux conducting stator pole projections having a gap therebetween, the coil portion being energizable from an alternating current source to produce instantaneous opposite polarity between the stator pole projections, an annular ceramic permanent magnet rotor supported for rotation about an axis perpendicular to a plane extending between the stator pole projections and with peripheral edge portions of the rotor adjacent the stator pole projections, individual permanent magnetic poles being formed about the periphery of the annular ceramic permanent magnet rotor and circumferentially disposed about the periphery of the rotor in fixed relation to the rotor with adjacent permanent magnetic poles being of opposite polarity, and a flux conductoR member fixed in the gap and extending in magnetic series relation between at least one pair of permanent magnetic poles of opposite polarity and in series with the stator pole projections.

Claim 3

The synchronous motor of claim 1 wherein the stator pole projections are provided by a pair of flat field plates arranged in coplanar parallel spaced relation with the stator pole projections on diametrically opposite sides of the rotor, and wherein the rotor is disposed in coplanar relation to the stator pole projections with diametrically opposed permanent magnetic poles each being of opposite polarity.

Claim 4

The synchronous motor of claim 1 wherein the fixed flux conductor member extends across the gap between diametrically opposed permanent magnetic rotor poles of opposite polarity and terminates in a pair of interpoles respectively positioned in the gap adjacent one of the stator pole projections and spaced apart therefrom a distance less than one permanent magnetic pole width with the interpoles each being displaced in a common angular direction from its respective stator pole projection relative to the rotational axis of the rotor.

Claim 5

The synchronous motor of claim 1 wherein the fixed flux conductor member is provided with multiple terminal projections disposed in the gap between the rotor and the field portion of the stator with the terminal projections serving as interpoles and being spaced apart from one another one permanent magnetic pole width.

Claim 6

The synchronous motor of claim 1 wherein each permanent magnetic pole is of substantially equal width, and wherein each stator pole projection width is generally equal to the width of each permanent magnetic pole.

Claim 7

The synchronous motor of claim 1 wherein the fixed flux conductor comprises a spider of ferromagnetic material having a hub coaxially aligned with the rotor adjacent one axial face thereof and a plurality of arms extending from the hub in diametrically opposite directions, the arms each terminating in a projection extending parallel to the rotor axis into the gap between the rotor and the field portion of the stator and providing a group of interpoles for each of the stator pole projections respectively, each group of interpoles being angularly spaced from one another one permanent magnetic pole width, and the interpoles in each group being displaced from their stator pole projection but having at least one of the interpoles positioned in adjacent relation thereto within a distance of one permanent magnetic pole width.

Claim 8

The synchronous motor of claim 1 wherein each individual permanent magnetic pole is of the same polarity at opposite axial faces of the rotor, and wherein the rotor is provided with a plurality of permanent magnetic poles symmetrically arranged in diametrically opposed relation with the diametrically opposite permanent magnetic poles being of opposite polarity.

Claim 9

The synchronous motor of claim 2 wherein the flux conductor member bridges the gap between diametrically opposed permanent magnetic poles and terminates in a pair of interpoles located in the gap respectively adjacent one of the stator pole projections, the interpoles each being displaced from its respective stator pole projection but being located within a distance of one permanent magnetic pole width thereof.

Claim 10

The synchronous motor of claim 4 wherein each permanent magnetic pole is of substantially equal width and wherein each stator pole projection width and each interpole width is generally equal to the width of each permanent magnetic pole.

Claim 11

A synchronous motor comprising a stator including a field portion and a coil portion disposed about the field portion, the field portion including a pair of spaced flux conducting stator pole projections having a gap therebetween, the coil portion being energizable from an alternating current source to produce instantaneous opposite polarity between the stator pole projections, a generally disklike annular ceramic permanent magnet rotor supported for rotation abOut an axis perpendicular to a plane extending between the stator pole projections and with peripheral edge portions of the rotor adjacent the stator pole projections, individual permanent magnetic poles being formed about the periphery of the annular ceramic permanent magnet rotor and circumferentially disposed about the periphery of the rotor in fixed relation to the rotor with adjacent permanent magnetic poles being of opposite polarity, the permanent magnetic poles each being through-magnetized in the direction of the thickness of the rotor to provide like poles on opposite axial faces of the rotor with each permanent magnetic pole being of equal width along its circumferentially extending peripheral surface, and a flux conductor member fixed in the gap and extending in magnetic series relation between at least one pair of permanent magnetic poles of opposite polarity and in series with the stator pole projections, the fixed flux conductor member extending across the gap between diametrically opposed permanent magnetic rotor poles of opposite polarity and terminating in a pair of interpoles respectively positioned in the gap adjacent one of the stator pole projections and spaced apart therefrom a distance less than one permanent magnetic pole width with the interpoles each being displaced in a common angular direction from its respective stator pole projection relative to the rotational axis of the rotor, and each stator pole projection and each interpole having a width generally equal to the width of each permanent magnetic pole.

Claim 12

A synchronous motor comprising a stator including a field portion and a coil portion disposed about the field portion, the field portion including a pair of spaced flux conducting stator pole projections having a gap therebetween, the coil portion being energizable from an alternating current source to produce instantaneous opposite polarity between the stator pole projections, a generally disklike annular ceramic permanent magnet rotor supported for rotation abOut an axis perpendicular to a plane extending between the stator pole projections and with peripheral edge portions of the rotor adjacent the stator pole projections, individual permanent magnetic poles being formed about the periphery of the annular ceramic permanent magnet rotor and circumferentially disposed about the periphery of the rotor in fixed relation to the rotor with adjacent permanent magnetic poles being of opposite polarity, the permanent magnetic poles each being through-magnetized in the direction of the thickness of the rotor to provide like poles on opposite axial faces of the rotor with each permanent magnetic pole being of equal width along its circumferentially extending peripheral surface, and a flux conductor member fixed in the gap and extending in magnetic series relation between at least one pair of permanent magnetic poles of opposite polarity and in series with the stator pole projections, the fixed flux conductor member extending across the gap between diametrically opposed permanent magnetic rotor poles of opposite polarity and terminating in a pair of interpoles respectively positioned in the gap adjacent one of the stator pole projections and spaced apart therefrom a distance less than one permanent magnetic pole width with the interpoles each being displaced in a common angular direction from its respective stator pole projection relative to the rotational axis of the rotor, and each stator pole projection and each interpole having a width generally equal to the width of each permanent magnetic pole.