Motor, and electric power steering apparatus and vehicle in which said motor is mounted

A synchronous type motor,

• wherein said synchronous type motor has a skew effect in a rotor gap surface of a mechanical angle one-cycle, by that a rotor magnetic pole comprises plural magnetic salient pole portions by means of magnetic material, N-pole magnets and S-pole magnets are alternately arranged on a rotor surface between said magnetic salient pole portions, and magnetic pole pitches of an electrical angle one-cycle, which comprise said magnetic salient pole portions and said N-pole magnets and said S-pole magnets, are unevenly arranged,
• wherein a torque generation mechanism due to a magnet torque and a reluctance torque is formed by said magnetic salient pole portions and said N-pole magnets and said S-pole magnets,
• wherein said rotor magnetic pole comprises four magnetic pole pitches P1 to P4, mechanical angles of said magnetic pole pitches P1 and P4 are A°, and mechanical angles of said magnetic pole pitches P2 and P3 are B° (≠A°),
• wherein a d-axis is an axis that a magnetic flux formed by said N-pole magnets and said S-pole magnets penetrates a rotor to a diameter direction, and a q-axis is an axis that a magnetic flux formed by a stator coil of a stator penetrates said rotor to a diameter direction,
• wherein Iq is a q-axis component of an armature current, Id is a d-axis component of said armature current, β is a lead angle of a rotational magnetic field for said d-axis, and β shows a phase for said d-axis of an input current,
• wherein δ is a rotor lead angle for a phase of said rotational magnetic field, and δ is determined based on said uneven magnetic pole pitches and is used for calculating said armature currents Iq and Id,
• wherein Ld is an inductance of said d-axis and Lq is an inductance of said q-axis,
• wherein Ia is an amplitude which is a half of a difference between a maximum value and a minimum value of said input current being alternating current,
• wherein Tr1, Tr2, Tr3 and Tr4 which are respectively reluctance torques in said magnetic pole pitches P1, P2, P3 and P4, are defined as follows:
• Tr1=(Lq−Ld)×Ia2×sin(β−δ)×cos(β−δ)
• Tr2=(Lq−Ld)×Ia2×sin(β+δ)×cos(β+δ)
• Tr3=(Lq−Ld)×Ia2×sin(β+δ)×cos(β+δ) and
• Tr4=(Lq−Ld)×Ia2×sin(β−δ)×cos(β−δ),
• wherein said magnetic pole pitches are unevenly arranged in order to reduce said reluctance torque which is a sum of Tr1, Tr2, Tr3 and Tr4 while phases of armature rotational magnetic fields corresponding to said magnetic pole pitches P1, P2, P3 and P4 are equivalent, by leading or delaying a phase of magnet magnetic field of said rotor side based on said rotor lead angle δ, thereby to reduce a torque ripple or a cogging torque.

A synchronous type motor,

• wherein said synchronous type motor has a skew effect by being line-symmetrically magnetic pole-arranged at a range of a mechanical angle 180°, by that a rotor magnetic pole comprises plural magnetic salient pole portions by means of magnetic material, N-pole magnets and S-pole magnets are alternately arranged on a rotor surface between said magnetic salient pole portions, and magnetic pole pitches of an electrical angle one-cycle, which comprise said magnetic salient pole portions and said N-pole magnets and said S-pole magnets, are unevenly arranged,
• wherein a torque generation mechanism due to a magnet torque and a reluctance torque is formed by said magnetic salient pole portions and said N-pole magnets and said S-pole magnets,
• wherein said rotor magnetic pole comprises four magnetic pole pitches P1 to P4, mechanical angles of said magnetic pole pitches P1 and P4 are A°, and mechanical angles of said magnetic pole pitches P2 and P3 are B° (≠A°),
• wherein a d-axis is an axis that a magnetic flux formed by said N-pole magnets and said S-pole magnets penetrates a rotor to a diameter direction, and a q-axis is an axis that a magnetic flux formed by a stator coil of a stator penetrates said rotor to a diameter direction,
• wherein Iq is a q-axis component of an armature current, Id is a d-axis component of said armature current, β is a lead angle of a rotational magnetic field for said d-axis, and β shows a phase for said d-axis of an input current,
• wherein δ is a rotor lead angle for a phase of said rotational magnetic field, and δ is determined based on said uneven magnetic pole pitches and is used for calculating said armature currents Iq and Id,
• wherein Ld is an inductance of said d-axis and Lq is an inductance of said q-axis,
• wherein Ia is an amplitude which is a half of a difference between a maximum value and a minimum value of said input current being alternating current,
• wherein Tr1, Tr2, Tr3 and Tr4 which are respectively reluctance torques in said magnetic pole pitches P1, P2, P3 and P4, are defined as follows:
• Tr1=(Lq−Ld)×Ia2×sin(β−δ)×cos(β−δ)
• Tr2=(Lq−Ld)×Ia2×sin(β+δ)×cos(β+δ)
• Tr3=(Lq−Ld)×Ia2×sin(β+δ)×cos(β+δ) and
• Tr4=(Lq−Ld)×Ia2×sin(β−δ)×cos(β−δ),
• wherein said magnetic pole pitches are unevenly arranged in order to reduce said reluctance torque which is a sum of Tr1, Tr2, Tr3 and Tr4 while phases of armature rotational magnetic fields corresponding to said magnetic pole pitches P1, P2, P3 and P4 are equivalent, by leading or delaying a phase of magnet magnetic field of said rotor side based on said rotor lead angle δ, thereby to reduce a torque ripple or a cogging torque.