CONTACTLESS TORQUE MOTOR Russian patent published in 2006 - IPC H02K21/00 

FIELD: electrical engineering; permanent-magnet contactless torque motors.

SUBSTANCE: proposed motor has magnetically soft laminated or solid annular slotted stator carrying toothed poles and m-phase concentrated armature winding, phase number being a multiple of m = 2^f ± 1, where f equals 1, 2, 3, ...; coils in each of its phases are spaced m stator pole pitches apart and connected in series; it also has rotor with N coaxially disposed magnetically soft laminated or solid toothed magnetic cores with relatively equal tooth pitches T_Z and equal tooth number Z_R which is a multiple of 2ⁿ at n equal to 2, 3, 4, ....Magnetic core number N is minimum two; when N is more than two, two extreme cores have same axial length L_P and N minus two cores are internal ones of same axial length equal to double L_p. Every adjacent magnetic cores are turned from one another through half the tooth pitch T_Z. Disposed between adjacent magnetic cores is layer of axially and unidirectionally saturated permanent magnets, b_M thick, number of permanent magnets being N - 1. With magnetic core number N greater than two, one permanent magnet is disposed between every two cores, thickness b_M of these permanent magnets being equal. Adjacent permanent magnets are separated by one internal magnetic core and magnetized in axially opposite directions. Magnetic cores and permanent magnets are mounted on common nonmagnetic bush whose thickness is greater than half the permanent-magnet layer b_M. Tooth thickness b_ZP of each magnetic core equals half the T_Z. Stator and magnetic-core poles are facing each other and are separated by air gap 5. Pole number is found from equation P = 2m x 2^s, where s equals 0, 1, 2 ...; poles carry odd number of teeth Z_c, b_zc thick, tooth pitch is T_Z; axes of adjacent teeth are offset with respect to one another through distance proportional to ±T_Z-to-m ratio. Spline width between stator poles b_spl equals minimum ten-fold air gap and is found from equation b_spl = T_Z x [(1 ± 1/m) - b_ZC/T_Z]. Tooth number Z_R is found from equation Z_R = P x (Z_C ± 1/m); b_ZC and b_ZP are interrelated by expression 2/3 ≤ b_ZC/b_ZP ≤ 1. Permanent magnets are made of high-coercivity alloy and have thickness b_M and radial height h_M meeting interrelated expressions 10 ≤ b_M/δ ≤ 30 and 0.75 ≤ h_M/L_P ≤ 2.5. Active axial length of slotted stator is found from equation L_C = 2L_P + 2L_P x (N - 2) + b_M x (N - 1).Rotor magnetic cores are disposed axially and symmetrically relative to slotted stator.

EFFECT: enhanced torque and power characteristics, simplified design, facilitated manufacture, enhanced use of active materials, reduced mass and size, enlarged functional capabilities.

1 cl, 5 dwg, 3 tbl