JP2006230116A5 - - Google Patents

Claims (13)

A rotor having a plurality of permanent magnet magnetic poles and a stator formed by laminating a stator iron core having a plurality of teeth facing the permanent magnet, and an auxiliary groove on a surface of the teeth facing the permanent magnet Is provided, and the width of the auxiliary groove, including zero, is changed depending on the position of the stator core in the stacking direction so as to reduce cogging torque. The ratio of the number of magnetic poles of the rotor to the number of slots of the stator is m: n, and the (l × k) f component of the cogging torque (k is the least common multiple of m and n, l is an integer of 1 or more, When the groove width angle of the auxiliary groove that minimizes the fundamental wave component is α, the stator core having a groove width angle of the auxiliary groove smaller than α and the groove width angle of the auxiliary groove larger than α. The permanent magnet type motor according to claim 1, wherein the stator core is laminated. The ratio of the number of magnetic poles of the rotor to the number of slots of the stator is m: n, and the (l × k) f component of the cogging torque (k is the least common multiple of m and n, l is an integer of 1 or more, When the groove width angle of the auxiliary groove that minimizes the fundamental wave component is α, the stator core without the auxiliary groove is laminated with the stator core whose groove width angle of the auxiliary groove is larger than α. The permanent magnet type motor according to claim 1 formed as described above. The magnetic poles of the rotor are skewed in multiple stages in the axial direction, and the angle of the step skew is set to an angle that minimizes one of the kf component or the 2 kf component of the cogging torque. 4. The permanent magnet type motor according to claim 2, wherein the motor is combined so that the other of the kf component and the 2kf component of the cogging torque is minimized in the stage. The magnetic poles of the rotor are obliquely skewed in the axial direction, and the angle of the oblique skew is set to an angle that minimizes one of the kf component or the 2 kf component of the cogging torque, and the stack of the stator cores is The permanent combination according to claim 2 or 3, wherein the permanent skew is combined so as to be symmetrical with respect to the axial center of the skew skew and to minimize the other of the kf component or the 2kf component of the cogging torque. Magnet type motor. The ratio of the number of magnetic poles of the rotor to the number of slots of the stator is m: n, and the groove width angle of the auxiliary groove is the kf component of cogging torque with θ1 and θ2 (k is the least common multiple of m and n, When f is the fundamental wave component) Y1 and Y2, and the cogging torque 2kf component is Z1 and Z2, Y2 = −δ × Y1, Z2 = −δ × Z1 (δ is a positive real number) Two types of stator cores having the groove width angles θ1 and θ2 of the auxiliary grooves as described above, and the stator core having the groove width angle θ1 and the stator core having the groove width angle θ2 having a shaft ratio of δ: 1. The permanent magnet motor according to claim 1, wherein the permanent magnet motor is laminated in a direction. The permanent magnet motor according to any one of claims 1 to 6, wherein the rotor has a magnet-embedded structure in which the permanent magnet is held inside a rotor core. A stator having magnetic poles of a plurality of permanent magnets and a mover formed by laminating an iron core having a plurality of teeth facing the permanent magnets, and an auxiliary groove is provided on a surface of the teeth facing the permanent magnets A permanent magnet linear motor characterized in that the groove width of the auxiliary groove is changed depending on the position of the iron core in the stacking direction, including zero, so as to reduce cogging torque. A mover having magnetic poles of a plurality of permanent magnets and a stator formed by laminating an iron core having a plurality of teeth facing the permanent magnets, and an auxiliary groove is provided on a surface of the teeth facing the permanent magnets A permanent magnet linear motor characterized in that the groove width of the auxiliary groove is changed depending on the position of the iron core in the stacking direction, including zero, so as to reduce cogging torque. The ratio of the pitch between the magnetic poles of the plurality of permanent magnets to the pitch of the slots between the plurality of teeth is m: n, and the (l × k) f component of the cogging torque (k is the least common multiple of m and n, l Is an integer equal to or greater than 1, and f is the electrical angle of the groove width angle of the auxiliary groove that minimizes the fundamental wave component). The permanent magnet linear motor according to claim 8 or 9, wherein the auxiliary groove is formed by laminating an iron core having a groove width angle larger than α in electrical angle. The ratio of the pitch between the magnetic poles of the plurality of permanent magnets to the pitch of the slots between the plurality of teeth is m: n, and the (l × k) f component of the cogging torque (k is the least common multiple of m and n, l Is an integer of 1 or more, and f is the electrical angle of the groove width angle of the auxiliary groove that minimizes the fundamental wave component), and the groove width angle of the auxiliary groove and the auxiliary groove is an electrical angle. The permanent magnet type linear motor according to claim 8 or 9, wherein an iron core larger than α is laminated. The ratio of the pitch between the magnetic poles of the plurality of permanent magnets to the pitch of the slots between the plurality of teeth is m: n, the groove width angle of the auxiliary groove is an electrical angle, and the kf component of cogging torque of θ1 and θ2 ( k is the least common multiple of m and n, f is the fundamental component) Y1 and Y2, and the cogging torque 2kf component is Z1 and Z2, Y2 = −δ × Y1, Z2 = −δ × There are provided two types of iron cores having an auxiliary groove with a groove width angle of θ1 and θ2 such that the groove width angle is Z1 (δ is a positive real number), and the groove width angle is an electrical angle of θ1 and the groove width angle. 10. The permanent magnet linear motor according to claim 8, wherein iron cores having an electrical angle of θ2 are laminated in a lamination direction of the iron cores at a ratio of δ: 1. A step of measuring cogging torque per unit thickness of a plurality of stator cores or a plurality of iron cores provided with auxiliary grooves having different groove widths at the tip of the teeth, and collecting amplitude / phase data of each frequency component of the cogging torque Measuring the phase-frequency of the cogging torque when the plurality of stator cores or the plurality of cores are sequentially stacked, and adjusting the number of stacked stator cores or cores based on the amplitude / phase data. And a step of manufacturing a permanent magnet type motor or a permanent magnet type linear motor .