Abstract: Laminated rotor (21) assemblies for rotating electric machines such as hybrid synchronous motors (HSM) of vehicle drives, the rotor plates (26) of which have one or several recesses (29) as a flux barrier or magnet pocket, which comprise radially innermost and outermost edge sections as rounded transition regions from and to edge sections lying therebetween. Each of the rounded transition regions may be shaped at least approximately respectively according to a part of a curve (35) of second order. Between adjacent recesses (29), a respective oblique cross-piece (52) is provided, the center line (54) of which lies obliquely to the pole axis (30).

Abstract: An electric drive motor that is intended for a vehicle, in particular for a motor vehicle, includes a stator and a rotor with at least one pole pair, wherein each pole of a respective pole pair has a magnet arrangement having at least one buried magnetic layer. The drive motor is characterized in that each pole has a number of magnetic flux influencing groups, each of which has a number of air-filled recesses, which are not assigned to a magnet of a respective magnetic layer for purposes of flux conductance.

Abstract: An apparatus is provided having a cylindrical stator and a rotor that is spaced from a stator to define an annular primary air gap that receives AC flux from the stator. The rotor has a plurality of longitudinal pole portions disposed parallel to the axis of rotation and alternating in polarity around a circumference of the rotor. Each longitudinal pole portion includes portions of permanent magnet (PM) material and at least one of the longitudinal pole portions has a first end and an opposing second end and a side magnet is disposed adjacent the first end and a side pole is disposed adjacent the second end.

Abstract: An interior permanent magnet (IPM) machine having a rotor and a stator is provided. The rotor includes a radially inner barrier devoid of magnets, and a radially outer barrier having at least one permanent magnet, each barrier having two pockets with one pocket disposed at an angle relative to the other. At least one of the pockets of the inner barrier has a shape of an irregular quadrilateral. At least one of the pockets of the outer barrier has a substantially trapezoidal shape with a first side generally parallel to a second side, wherein the first side has a portion slanted relative to the third side. In such an IPM machine, demagnetization of the outer barrier magnet is limited when operating temperatures and electrical current exceed operating conditions prescribed by design specifications.

Abstract: A unidirectionally-energized brushless DC motor includes a disk attached to a frame, a plurality of plate-like permanent magnets disposed on the disk at equal intervals around the disk, magnetic cores fixed to the frame according to the plurality of permanent magnets, windings each of which is wound around the magnetic core and to which DC power is supplied, a predetermined number of magnetic cores fixed to the frame, and windings each of which is wound around the magnetic core and connected to a power consumption device. The permanent magnets are located such that an angle formed by a straight line passing through the center of the disk and the center of the permanent magnet and a normal line in the center of a magnetic pole plane of the permanent magnet ranges from 0° to 60°.

Abstract: An apparatus for magnetizing magnets provided among a plurality of cores of a motor of a washing machine and a method thereof, is capable of fully magnetizing a magnet forming a rotor and including a plurality of teeth disposed around two cores of the plurality of cores, the two cores being laterally provided while interposing one of the magnets therebetween, and a coil being provided around the plurality of teeth to form a magnetic flux to magnetize the one magnet interposed between the two cores laterally provided.

Abstract: A motor in which drive current supplied to a winding is controlled in accordance with a rotational position of a rotor detected from a waveform of an induced voltage between phases. The motor is provided with a stator including 3×n teeth and windings for three phases. A rotor includes a rotor core, an n number of magnets, and an n number of salient poles. The magnets function as one of the magnetic poles, the salient poles function as the other one of the magnetic poles. Each salient pole is spaced apart by a gap from the adjacent ones of the magnets in the circumferential direction. The magnets and gap are arranged inward in the radial direction from the rotor core. An electrical angle between two ends of each magnet is set to be smaller than an electrical angle between two ends of each salient pole.

Abstract: A rotor of a permanent magnet embedded motor includes a rotor iron core formed by stacking a predetermined number of magnetic steel sheets punched into predetermined shapes, a plurality of permanent-magnet insertion holes formed along an outer circumferential portion of the rotor iron core and each including permanent-magnet end-portion cavities on its both ends, a plurality of permanent magnets inserted into the permanent-magnet insertion holes, and a plurality of slits formed in the outer-peripheral side iron core portion outside of each permanent-magnet insertion holes, wherein a distance between a first slit present in a radial direction of each of the end portions of the permanent magnets and a second slit, which is adjacent to the first slit and closer to the center of its magnetic pole, is smaller than a distance between those slits other than the first and second slits.

Abstract: A permanent magnet rotary machine comprises a rotor comprising a rotor core and a plurality of permanent magnet segments embedded in the rotor core and a stator having a plurality of coils and disposed to define a gap with the rotor, or a permanent magnet rotary machine comprises a rotor comprising a rotor core and a plurality of permanent magnet segments mounted on the surface of the rotor core and a stator having a plurality of coils and disposed to define a gap with the rotor. In the rotor, each permanent magnet segment is an assembly of divided permanent magnet pieces, the coercive force near the surface of the magnet piece is higher than that in the interior of the magnet piece, and the assembly allows for electrical conduction between the magnet pieces.

Abstract: An apparatus and method for driving a motor of an air conditioner are disclosed. A method for driving a motor of an air conditioner includes driving the motor in response to a predetermined speed command, sequentially detecting first and second mechanical angles in response to the speed command or a reference speed being spaced apart from the speed command by a predetermined range, calculating a maximum speed mechanical angle corresponding to a maximum speed ripple of the motor on the basis of the detected first and second mechanical angles, and compensating for load torque of the motor on the basis of the calculated the maximum speed mechanical angle. As a result, the speed ripple is decreased during the constant speed operation.

Abstract: A permanent-magnet-type rotating electrical machine capable of realizing variable-speed operation in a wide range from low speed to high speed at high output and improving, in a wide operating range, efficiency, reliability, and productivity. The rotating electrical machine includes a first permanent magnet whose product of coercive force and magnetizing direction thickness is small and a second permanent magnet whose product of coercive force and magnetizing direction thickness is large, to form a magnetic pole. The product of coercive force and magnetizing direction thickness of the first permanent magnet is equal to or larger than the product of magnetic field strength and magnetizing direction thickness of the second permanent magnet at a no-load operating point. At the magnetic pole, a magnetic field created by a current of an armature coil magnetizes the first permanent magnet, irreversibly changing a flux amount of the first permanent magnet.

Abstract: A brushless motor including a stator having teeth and a rotor having magnetic pole portions is disclosed. The magnetic pole portions are arranged to have the same polarities as each other. The rotor includes gaps that function as magnetic resistance at circumferential ends of each of the magnetic pole portions so that an iron core portion is formed between the circumferentially adjacent magnetic pole portions. Magnetic flux of the magnetic pole portions passes through the iron core portion along the radial direction. The gaps include a first gap located on the leading end of the magnetic pole portion in the rotation direction of the rotor and a second gap located on the trailing end of the magnetic pole portion in the rotation direction of the rotor. The circumferential width of the first gap is set to be greater than the circumferential width of the second gap.

Abstract: A rotary electric machine includes a stator having stator windings; and a rotor rotatably disposed in the stator, said rotor having a rotor core provided with a plurality of magnets and a plurality of magnetic auxiliary salient poles formed between poles of the magnets. In this rotary electric machine: a magnetic air gap is provided in an axial direction of the rotor in a position shifted in a circumferential direction from a q axis passing through a center of the magnetic auxiliary salient pole within the magnetic auxiliary salient pole; and an amount of shifting the magnetic air gap from the q axis in the circumferential direction differs according to a position of the magnetic air gap in the axial direction so as to cancel torque pulsation in energization caused due to the magnetic air gap.

Abstract: A permanent magnet type rotating electrical machine includes a rotor having a rotor core. Magnet holes circumferentially arranged at regular intervals in the rotor core include pairs of first magnet holes and pairs of second magnet holes. Each pair of first magnet holes are symmetric with respect to an imaginary line extending through a rotor core center. Each pair of second magnet holes are located on a radially inner side of the rotor core and are symmetric with respect to the imaginary line. Each pair of second magnet holes are located on an inner circumferential side of the paired first magnet holes with respect to a radial direction of the rotor core. A first magnet angle made by permanent magnets located in each pair of first magnet holes is larger than a second magnet angle made by permanent magnets located in each pair of second magnet holes.

Abstract: In an embedded magnet motor, radial magnets and first inclined magnets form north poles. The radial magnets and second inclined magnets form south poles. Core sheets each include preformed radial accommodating slots the number of which is expressed by P/2. Some of the preformed radial accommodating slots are short slots and the rest are long slots. The short slots are located at some parts of each radial accommodating slot along the axial direction. Radially inner ends of the short slots restrict the radial magnets from moving radially inward.

Abstract: A rotor includes a rotor core, a first magnet, a second magnet, a first pole partition line, and a second pole partition line. The first and second magnets are provided inside the rotor core and between the first and second pole partition line. The first magnet is closer to the first pole partition line than to the second pole partition line, and the second magnet is closer to the second pole partition line than to the first pole partition line. A distance between the first and second magnets at a position is wider as the position is closer to a circumference portion of the rotor core. The first magnet and the first pole partition line have a first minimum distance therebetween, the second magnet and the second pole partition line have a second minimum distance therebetween, and the first minimum distance is smaller than the second minimum distance.

Abstract: A synchronous machine comprises a stator and a rotor that faces the stator and rotates on a shaft thereof in a circumferential direction. The rotor has magnetic salient poles that generate reluctance torque and magnet-originating magnetic poles that generate magnet torque by using permanent magnets embedded in the rotor. The machine comprises means for shifting a magnetically substantial central position of magnetic flux emanating from the permanent magnets in the circumferential direction, by an electrical angle ?/2 plus a predetermined angle ??, from a reference position taken as a central position between paired magnetic salient poles composing each magnetic pole of the machine among the magnetic salient poles. Hence a maximum amplitude of a sum between a harmonic component of the magnet torque and the reluctance torque is changed from that obtained at the reference position without the shift.

Abstract: An interior permanent magnet electric machine is disclosed. The interior permanent magnet electric machine comprises a rotor comprising a plurality of radially placed magnets each having a proximal end and a distal end, wherein each magnet comprises a plurality of magnetic segments and at least one magnetic segment towards the distal end comprises a high resistivity magnetic material.

Abstract: A permanent magnet excited synchronous machine (1) with embedded magnets, which is particularly suitable for range extender generator. It includes stator (2) and rotor (3) being provided with exciter magnets (7). The rotor (3) has at least two rotor poles (4), each is provided with one exciter magnet (7). In order to increase the magnetic torque limit of the synchronous machine (1)—in each rotor pole (4) at least one, preferably several selective magnetic flux barriers, preferably as substantially radial slots (8) being parallel with the main pole flux is/are provided in the area of the pole shoe.

Abstract: A magnet embedded rotor is provided in which permanent magnets are embedded in the iron core of the rotor at a fixed interval. Notch parts are formed at the first protruding part and both the sides of the first protruding parts on the outer face between salient poles in the iron core of the rotor correspond to the multiple permanent magnets. Non-magnetic parts for preventing the short circuit of magnetic flux are formed at both the edges of the permanent magnets. A bridge part between the non-magnetic parts and the notch parts are narrowed as much as possible to an extent to cause a magnetic saturation, and one or multiple of the second protruding part extending to the direction of the outer face are formed at the notch parts.

Abstract: In an IPM motor rotor, a rotor core has a plurality of magnetic poles, and each magnetic pole is formed by two permanent magnets. The two permanent magnets of each magnetic pole are two split pieces obtained by splitting one parent permanent magnet that is larger than the permanent magnets.

Abstract: The present invention relates to synchronous motor comprising a cylindrical rotor (4) provided with permanent magnets (3) located inside a cylindrical stator provided with a winding (U, V, W), characterized in that the rotor is provided with protuberances (41) facing the said winding.

Abstract: A motor includes: a stator (12) having coils; a rotor (11), which is disposed inside the stator and has a plurality of magnets; and a magnetic path switching part (18), which is provided in the rotor (11) and switches a magnetic path of the rotor (11) to select intense field control as a forward salient-pole structure or weak field control as an inverse salient-pole structure. The magnetic path switching part (18) is formed by use of a member having magnetic anisotropy, which is arranged on a magnetic path connecting magnets (13) of the same pole and a magnetic path connecting magnets (13) of different poles in the rotor (11). By changing the magnetic anisotropy of the member, the forward salient-pole structure and the inverse salient-pole structure are switched therebetween.

Abstract: A method for securing a permanent magnet within a rotor core is described. The rotor core includes a first end and a second end and at least one permanent magnet opening configured to receive the permanent magnet. The method includes coupling a first rotor end lamination to the first end of the rotor core. The first lamination includes at least one inner wall that defines an opening within the first lamination that corresponds to the permanent magnet opening in the rotor core. The first lamination includes a bridge portion positioned between the at least one inner wall and an outer edge of the first rotor end lamination. The method also includes positioning a permanent magnet at least partially within the permanent magnet opening and mechanically deforming the bridge portion of the first lamination to secure the permanent magnet within the permanent magnet opening.

Abstract: A rotor that can reduce the used amount of resin for securing a permanent magnet is provided. The rotor includes a rotor core provided fixedly to a rotation shaft and having a magnet insertion hole extending in an axial direction formed therein, a permanent magnet embedded in the magnet insertion hole and extending in the axial direction and extending in a direction inclined relative to a radial direction of the rotor core, and a resin layer that secures the permanent magnet to the rotor core. The resin layer covers a surface of the permanent magnet and is in contact with an inner surface of the magnet insertion hole. A hollow space extending in the axial direction is left in the magnet insertion hole at an inner side in the radial direction relative to the permanent magnet. Part of the inner surface of the magnet insertion hole is exposed to the hollow space.

Abstract: An interior permanent magnet type brushless direct current (BLDC) motor includes a stator having a plurality of slots. The BLDC motor also includes a rotor positioned in the stator and that is rotatable with respect to the stator. The rotor has a rotor core, a plurality of permanent magnets inserted in the rotor core, a plurality of vent holes positioned between the center of the rotor core and the permanent magnets, and a plurality of coupling holes positioned between the permanent magnets and a periphery of the rotor core.

Abstract: A rotor is provided. The rotor includes a rotor iron core including slots formed around an outer circumferential portion thereof; magnet pieces which are inserted into the slots, respectively, such that a magnetic orientation of the magnet pieces are inverted every predetermined number of the slots; and two end plates, one end plate disposed on each end side in an axial direction of the rotor iron core, the two end plates covering the slots in the axial direction. The rotor iron core also includes cutout portions, which are located at an interval between adjacent ones of the slots, each of the cutout portions extending in the axial direction of the rotor iron core. One of the two end plates includes injection openings, each of which corresponds to a respective one of the slots, and communicating grooves each of which is formed so as to communicate with one of the cutout portions.

Abstract: A brushless motor including a stator having teeth and a rotor having magnetic pole portions is disclosed. The magnetic pole portions are arranged to have the same polarities as each other. The rotor includes gaps that function as magnetic resistance at circumferential ends of each of the magnetic pole portions so that an iron core portion is formed between the circumferentially adjacent magnetic pole portions. Magnetic flux of the magnetic pole portions passes through the iron core portion along the radial direction. The gaps include a first gap located on the leading end of the magnetic pole portion in the rotation direction of the rotor and a second gap located on the trailing end of the magnetic pole portion in the rotation direction of the rotor. The circumferential width of the first gap is set to be greater than the circumferential width of the second gap.

Abstract: The invention relates to an annular rotor having a hollow shaft for an electric machine. In order to allow transport of such a machine, particularly for a very large model, the rotor is divided in the circumferential direction into a plurality of partial annular rotor segments (1). The rotor further comprises a hollow shaft, wherein the closed ring shape of the rotor can be broken by separating the rotor segments (1) from each other.

Abstract: A rotor comprises a rotor core, a plurality of magnetic poles arranged in a circumferential direction of the rotor core, a plurality of salient poles and a plurality of auxiliary magnets each of which is disposed between the magnetic pole and the salient pole is provided. Each magnet pole has a field magnet pole that serves as a first magnetic pole, wherein the field magnet is a main magnet. Each salient pole is integrally formed with the rotor core between the two adjacent magnetic poles. Each salient pole serves as a second magnetic pole. The pole of the second magnetic pole is opposite from that of the first magnetic pole. The auxiliary magnet generates magnetic flux in a circumferential direction of the rotor core so that the magnetic pole and an opposing pole of the auxiliary magnet have the same polarity and the salient pole and another opposing pole of the auxiliary magnet have the same polarity.

Abstract: In general, the various embodiments are directed to a permanent magnet machine (“PM machine”), and more specifically an internal permanent magnet machine (“IPM machine”) that includes rotor magnets configured asymmetrically with respect to the rotor periphery, thereby producing an averaging effect similar to that achieved through traditional skewing of the rotor magnets. In alternate embodiments, the span, placement and/or shape of the magnets may vary from one pole to the next.

Abstract: A rotor of a rotary electric machine includes a rotor core and a plurality of magnetic parts. The rotor core has a plurality of slots provided along a circumferential direction. Each of the slots is separated by a center rib. The plurality of magnetic parts are disposed inside the rotor core along the circumferential direction at a predetermined interval. Each of the magnetic parts has a magnetization direction alternating with each other. Each of the magnetic parts includes a pair of permanent magnets placed inside each of the slots. The rotor core comprises a plurality of through-holes and a reinforcement rib. The plurality of through-holes each extend in an axial direction on an inner circumferential side of each of the magnetic parts. The reinforcement rib is disposed in each of the through-holes and in alignment with a circumferential center line of the center rib.

Abstract: A rotary electric machine includes a rotor core, and a permanent magnet embedded in proximity to an outer circumferential portion of the rotor core, in which gaps for reducing irreversible demagnetization of the permanent magnet are provided on portions on an inner circumference side of the permanent magnet, the portions being of the rotor core in proximity to an inner circumferential surface of the permanent magnet.

Abstract: The present invention provides a brushless motor for a fluid pump that allows implementing a fluid pump that overcomes problems of durability and reduction of energy efficiency due to DC motors in the related art and provides excellent operational characteristics, by ensuring a space allowing fluid to flow between a stator and a rotor, and ensuring and maintaining excellent driving characteristics of a motor, and a fluid pump using the brushless motor.

Abstract: A motor includes a rotor of 4n magnetic poles and a stator. The rotor includes a rotor core, 2n magnets embedded in the rotor core and 2n salient pole portions formed integrally with the rotor core. A gap is formed between each magnet and the circumferentially adjacent salient pole portion. The stator has 6n tooth portions arranged to face the magnets and the salient pole portions in the radial direction, and coils. Each coil is wound about one of the tooth portions. An electric angle ? that corresponds to a mechanical angle ?? defined by a reference line that passes through a central axis of the rotor and the circumferential center position of each magnet, and a line that passes through the central axis of the rotor and the trailing end of each trailing gap, is set in the range of 90°<?<126°.

Abstract: When a rectangular wave voltage control mode is selected, a control apparatus estimates the output torque of an alternating-current motor based on the outputs of a current sensor and a rotation angle sensor, and executes torque feedback control by adjusting the phase of rectangular wave voltage based on the difference between the torque estimated value and a torque command value. The control apparatus executes a switching interruption that outputs a control command to a switching element of an inverter every 60 degrees of electrical angle, and executes an angle interruption that samples the phase currents of the alternating-current motor based on the output of the current sensor and converts those phase currents into a d-axis current and a q-axis current every predetermined electrical angle that is set beforehand.

Abstract: An internal permanent magnet machine (“IPM machine”) of the type used, for example, with traction motors and hybrid electric vehicles, includes a rotor with an additional air barrier provided above the first magnet barrier in the same rotor slot. Each magnet only fills a portion of each cavity, thereby defining the air barriers. The added air barrier above the permanent magnet of the first layer acts as a barrier to the first layer magnet and lowers the magnet flux.

Abstract: A rotor core of a rotating electrical machine formed by stacking a plurality of blanks blanked from a steel sheet, the blank having a yoke, a magnetic pole portion confronting the yoke, and a magnet insertion hole positioned between the yoke and the magnetic pole portion, the magnetic pole portion having a projection projecting circumferentially at two circumferential sides thereof.

Abstract: A rotating portion of a rotary electric machine includes a shaft arranged to extend along a central axis, and a rotor core fixed to the shaft. The rotor core includes a through hole group including a plurality of through holes extending through the rotor core in an axial direction. The through hole group is arranged not to be symmetrical with respect to any imaginary plane including the central axis.

Abstract: An internal permanent magnet machine has multiple rotor sections, each section having multiple rotor laminations. Permanent magnets are placed asymmetrically in lamination openings to attenuate oscillations in torque caused by harmonic components of magnetic flux.

Abstract: A permanent magnet rotating machine has a stator, in which armature windings are formed in a plurality of slots formed in a stator iron core, and also has a rotor, in which two magnet insertion slots are formed for each pole in a rotor iron core in a V shape when viewed from the outer circumference of the rotor and one permanent magnet is embedded in each magnet insertion slot with polarity alternating for each pole; a wall at one end of the magnet insertion slot on the external diameter side of the rotor is formed with three arcs having different curvatures, one of the three arcs being parallel to the outer circumference of the rotor, and a wall at the other end of the magnet insertion slot on the internal diameter side of the rotor is formed in an arc shape.

Abstract: It is an objective to provide a permanent magnet synchronous motor that is highly efficient with low vibration and low noise. A stator 30 includes a stator core 1 that includes magnetic pole teeth 2 each formed between adjacent slots 3, and stator windings 4 that are provided in the slots 3 of the stator core 1. A rotor 40 includes a rotor core 5, a plurality of magnet retaining holes 8, permanent magnets 7 inserted in the magnet retaining holes 8, and a plurality of slits 6 in the rotor core 5 on an outer circumferential side of the magnet retaining holes 8. Among the slits 6, slits 6 in a vicinity of a magnetic pole center of the rotor core 5 are oriented in a direction where a magnetic flux generated by a permanent magnet 7 converges outside the rotor core 5, whereas slits 6 in a vicinity of a pole border portion of the rotor core 5 are oriented in another direction that is different from the direction of the plurality of slits 6 in the vicinity of the magnetic pole center of the rotor core 5.

Abstract: An electric machine includes a stator and a rotor core including a first rotor portion positioned adjacent the stator and having an outside diameter. The first rotor portion includes a plurality of elongated slots that define a plurality of poles. The electric machine also includes a plurality of magnets. Each of the plurality of magnets is positioned within one of the slots and arranged such that each of the plurality of poles has a magnetic arc length that is different than a magnetic arc length of any adjacent pole.

Abstract: A rotor (100) for an electric motor (1000). The rotor (100) has a rotor shaft (10) and a rotor core (20) attached onto the rotor shaft (10). The rotor core has a plurality of core laminations (40, 140) arranged along an axis (A) of the rotor core (20), and has a plurality of poles of at least one pole pair, the core lamination (40, 140) having: a central recess (70, 170) through which the rotor shaft (10) passes and which has a contour (71, 171) as well as adjacent areas (AF), and a plurality of receiving structures arranged at peripheral angular positions in order to each form a receiving element for a pole-forming element on the rotor core (20).

Abstract: The present invention provides a rotor for an interior permanent magnet synchronous motor for driving an air blower, in which the structure of the rotor is suitably modified to reduce magnetic flux leakage and, at the same time, maximize saliency ratio, thus improving the performance of the motor.

Abstract: A synchronous rotating electrical machine is disclosed, of the type including a stator (10) and a rotor (11). The rotor is of the flux concentration type and includes a plurality of alternate North and South poles formed from permanent magnets (PM). The magnets are housed in slots (E1) arranged in the magnetic body of the rotor. The rotor includes, for each permanent magnet, a magnetic circuit allowing the circulation of a defluxing magnetic flux. This magnetic circuit has a magnetic reluctance of the defluxing circuit (Rf) determined as a function of an internal magnetic reluctance of the magnet (Ra) such that the ratio (Rf/Ra) of the magnetic reluctance of the defluxing circuit on the internal magnetic reluctance of the magnet (Ra) is within a range of predetermined values guaranteeing the magnet against a risk of demagnetisation. This range of predetermined values is from approximately 0.3 to approximately 3 depending on the type of magnet.

Abstract: According to one embodiment, a rotor 1 has rotor cores 2a, 2b divided in the axial direction. a permanent magnet 30 is mounted at the position of each of the magnetic poles of cores. The permanent magnet 30 of each magnetic pole is configured by a single tabular member that penetrates the two divided cores in the axial direction. Convex parts 31a, 31b are respectively provided on the outer peripheries of the respective magnetic poles of the rotor cores along the axial direction of the rotor. The convex parts 31a, 31b are provided to positions that are displaced for each of the two divided cores. The magnetic flux density increases in the convex parts, which becomes the magnetic pole center. Since the convex parts positions are displaced to each other, a skew function can be exhibited even if the permanent magnet is mounted at the same position.

Abstract: A rotor for an electric rotating machine includes d-axis through holes located on respective d-axes, hollow shafts formed in both axial sides of a rotating shaft not inserted into a rotor core, presser plates mounted on both axial ends of the rotor core, cooling grooves formed in faces of the presser plates in contact with the rotor core, a plurality of presser plate refrigerant outlet holes in the presser plates, the presser plate refrigerant outlet holes of one of the presser plates having diameters different from diameters of the presser plate refrigerant outlet holes of one of the other presser plates, and a refrigerant channel formed so that a refrigerant supplied into one of the hollow shafts of the rotating shaft flows through the refrigerant channel and further through the hollow shaft wall hole of said one hollow shaft and the radial grooves of the respective presser plates.

Abstract: Two magnets in a circumferential direction of a rotor are provided in each slot of the rotor. The two magnets are consistently pulled in a direction in which they are mutually separated by magnetism of a stator and fixed on inner surfaces on both sides of the slot in the circumferential direction of the rotor.

Abstract: A brushless motor has a stator and a rotor. The stator has a stator core with a plurality of inwardly extending salient poles and windings wound about the salient poles. The rotor has a shaft, a rotor core fixed onto the shaft, and magnets inserted in the rotor core for forming magnetic poles of the rotor. Each of the salient poles has a pole shoe with a pole face that extends along a circumferential direction confronting the rotor core and being spaced from the rotor core by an air gap. In a radial cross section of the motor, each of the magnetic poles of the rotor has an effective dimension (W) which is about 0.85 times to 1.2 times of the chord length (L) of each pole face.