Abstract: A vehicle drive motor, capable of efficiently cooling the motor stator without being accompanied by an increase in size, includes a stator having an annular stator core, provided in an inner periphery of a tubular motor casing, and a stator coil provided in the stator core, and a rotor on an inner side of the stator core and rotatable relative to the stator. The motor casing includes an oil supply passage and an oil discharge passage in the motor casing and opening at an inner diametric surface of the motor casing, which are opposite axially to each other. Stator core grooves communicated with the oil supply passage and the oil discharge passage extend axially in an outer diametric surface of the stator core. Accordingly, lubricant oil may flow from the oil supply passage towards the oil discharge passage through the stator core groove.

Abstract: A winding structure which is disposed over an armature and a commutator includes an equalizer. The equalizer includes a going portion and a return portion which are wound across one group of teeth through a slot and connected between two identical segments. In a case where an integer number is an expansion value among values which are integer multiples of a value which is acquired by dividing the total number of the slots by the total number of pole pairs, when one group of the teeth having the same total number as the expansion value is given as an element teeth group, the going portion and the return portion are wound across the element teeth group through the slots positioned at both sides of the element teeth group.

Abstract: A drive motor for an electrically powered automotive vehicle is provided which includes a motor stator including a magnetic body and coils. The inner peripheral surface of the magnetic body has a plurality of teeth protruding therefrom, around which the coils are wound. The drive motor also includes a motor housing mounted to an outer periphery of the motor stator to retain the motor stator. The outer peripheral surface of the magnetic body includes cutout portion(s) formed at circumferential location(s) thereof, with the circumferential location(s) being at the same phase as those of the teeth. An inner peripheral surface of the motor housing includes engagement portion(s) formed at circumferential location(s) thereof, with the circumferential location(s) being opposed to the cutout portion(s). The engagement portion(s) is/are engageable with the cutout portion(s). The engagement portion(s) and the cutout portion(s) cooperate with each other to form arresting unit(s) for arresting the motor stator.

Abstract: An in-wheel motor drive apparatus is provided that facilitates the dissipation of the heat generated by a motor and that is excellent in cooling performance. A range (L) of number of revolutions within which a motor (B) generates a maximum torque by low-speed-rotation includes a high-output sub-zone (LH) in which a torque is no less than 50% of the maximum torque. In the high-output sub-zone, a loss in a stator represents no less than 50% of a loss in the motor (B), with the loss in the motor consisting of copper loss and core loss. The motor (B) may include cooling medium passage(s) (45) configured to cool coil portion(s) (28) of the stator (23) with a cooling liquid, and the copper loss may represent no less than 25% of the loss in the motor (B).

Abstract: A drive motor for an electric vehicle is an IPM motor including a motor rotor (25), which is made up of a rotor core portion (29) having an inner peripheral surface, which is mounted externally on a rotary output shaft (24) and which is round in sectional shape, and a permanent magnet (30) disposed within the rotor core portion (29). At a circumferential position which will become proximate to a site of the permanent magnet (30), displaced towards an outer diametric side of the rotor core portion (29), an inner peripheral surface of the rotor core portion (29) and an outer peripheral surface of the rotary output shaft are provided with respective non-round shaped portions (29a, 24a) of a circular shape in section, which form respective parts of a detention or arresting unit (31) for arresting the motor rotor (25) from rotating relative to the rotary output shaft (24).

Abstract: Even when the effective radii of wheels differ from each other because of a change in tire pneumatic pressure, the difference in driving force between left and right drive wheels are substantially zeroed to suppress a turning force to thereby increase the traveling stability. The use is made of a corrector for correcting a command value to be outputted to a drive circuit for an electric drive motor for each of the drive wheels. This corrector receives the steering angle, the respective numbers of revolutions of the drive wheels and an electric drive motor current and corrects with the use of the steering angle as measured with respect to a traveling direction so that command values relative to the drive wheels may have such a relation that the turning force induced in a vehicle as a result of the difference in effective radius between the drive wheels can be suppressed.

Abstract: A multipolar motor is simply wire-wound and an output thereof is capable of being switched. The motor includes at least 8 magnetic poles, an armature including at least 10 tooth sections; a commutator including at least 20 commutator segments, and brush-sets including 2 positive electrode brushes and 2 negative electrode brushes. A hook-holding section arranged to hook-hold conductor wires is installed on each of the commutator segments. Further, a group of coils is defined by using a single conductor wire that is wound onto each of the plurality of tooth sections and hooked onto the plurality of hook holding sections. This motor can switch the state in which the brush-set is energized.

Abstract: A vehicle drive motor, capable of efficiently cooling the motor stator without being accompanied by an increase in size, includes a stator having an annular stator core, provided in an inner periphery of a tubular motor casing, and a stator coil provided in the stator core, and a rotor on an inner side of the stator core and rotatable relative to the stator. The motor casing includes an oil supply passage and an oil discharge passage in the motor casing and opening at an inner diametric surface of the motor casing, which are opposite axially to each other. Stator core grooves communicated with the oil supply passage and the oil discharge passage extend axially in an outer diametric surface of the stator core. Accordingly, lubricant oil may flow from the oil supply passage towards the oil discharge passage through the stator core groove.

Abstract: An internal cooling structure for a motor, which is effective to remove the heat in the rotor to achieve high cooling effect is provided. The motor includes a stator having a stator coil and a stator core, and a rotor positioned on an inner side of the stator core. The rotor includes a tubular rotor spindle on a rotor drive shaft, and the rotor core is fitted to the rotor spindle. A cooling space is defined between the rotor drive shaft and the rotor spindle. An inner peripheral surface of the rotor spindle confronting the cooling space has tapered shape having large diameter at an end portion. An oil feed passage for a cooling oil is defined inside the rotor drive shaft, and a cooling oil discharge port of such oil feed passage is formed in the rotor drive shaft confronting the cooling space.

Abstract: In a motor, an insulator covering an armature core has a lid covering an end surface of the armature core. The lid has an inner ring disposed radially inside slots of the armature core and an outer ring disposed radially outside the slots. Each of a plurality of slot insulators inserted into the slots has a blocking portion at a position in the inner ring.

Abstract: A resolver includes a stationary unit centered about a center axis, and a rotary unit disposed inside or outside the stationary unit to be rotatable around the center axis with respect to the stationary unit. The stationary unit includes teeth radially arranged around the center axis, and an insulator covering surfaces of the teeth. The stationary unit further includes output coils formed on the teeth by winding at least one of two output wires around each of the teeth via the insulator in a first number of turns and in multiple layers, and excitation coils formed on the teeth by winding an excitation wire around the output coils in multiple layers and in a second number of turns less than the first number of turns.

Abstract: In a motor, an upper surface of a flange portion of a shaft is arranged axially below a bottom end surface of a rotor core. A spacer having an axial thickness slightly greater than that of the flange portion is arranged on a radially outer side of the flange portion. A bottom surface of the spacer makes contact with an end plate whose inner circumferential surface has a radius, centered about a central axis, smaller than a radius of the flange portion. The end plate is secured to the rotor core via a fixing member.

Abstract: A resolver of a variable reluctance type includes a resolver stator portion of a substantially annular shape centered about a central axis, and a resolver rotor portion which is attached to a shaft of a motor rotor portion arranged inwardly of the resolver stator portion. The resolver is operable to increase accuracy for detecting a rotational angle when a size of gap g between a rotor core and a resolver stator portion at a predetermined point at an outer circumferential edge of the rotor core is set by using a maximum value for the gap g (gmax), a minimum value for the gap g (gmin), angle ? defined by a predetermined point and a reference point, axial double angle n, and the coefficient.

Abstract: After a winding machine connects a winding wire to a terminal pin, a slackening member is moved in a substantially horizontal direction substantially orthogonal to a direction of a terminal block being extended so as to be located on an orbit of the winding wire. Then, a led part of the winding wire radially between the terminal pin and teeth is extended to the teeth while in contact with a curved surface of a tip of the slackening member. That is, the led part is extended while bent in the substantially horizontal direction. After the winding wire is wound around the respective teeth, the slackening member is moved out of the orbit.

Abstract: A resolver includes a stationary unit centered about a center axis, and a rotary unit disposed inside or outside the stationary unit to be rotatable around the center axis with respect to the stationary unit. The stationary unit includes teeth radially arranged around the center axis, and an insulator covering surfaces of the teeth. The stationary unit further includes output coils formed on the teeth by winding at least one of two output wires around each of the teeth via the insulator in a first number of turns and in multiple layers, and excitation coils formed on the teeth by winding an excitation wire around the output coils in multiple layers and in a second number of turns less than the first number of turns.

Abstract: In a motor, an insulator covering an armature core has a lid covering an end surface of the armature core. The lid has an inner ring disposed radially inside slots of the armature core and an outer ring disposed radially outside the slots. Each of a plurality of slot insulators inserted into the slots has a blocking portion at a position in the inner ring.

Abstract: In a motor, an insulator covering an armature core has a lid covering an end surface of the armature core. The lid has an inner ring disposed radially inside slots of the armature core and an outer ring disposed radially outside the slots. Each of a plurality of slot insulators inserted into the slots has a blocking portion at a position in the inner ring.

Abstract: A switch 1 includes a ceramic cylindrical tube 3, first and second end caps 5 and 7 that cover the open end in an axial direction of the ceramic cylindrical tube 3, a movable electrode 9 which slides easily on first end cap 5 and a fixed electrode 11 attached to second end cap 7. The ceramic cylindrical tube 3 is a ceramic fired body that contains 45 to 65% by weight of alumina and 35 to 55% by weight of crystallized glass. First and second end caps 5 and 7 are attached to both ends in the axial direction of the ceramic cylindrical tube 3. A low temperature metallizing layer is formed on the ends thereof, and a plating layer is formed on top of the metallizing layer where first and second end caps 5 and 7 are brazed.

Abstract: In a motor, an upper surface of a flange portion of a shaft is arranged axially below a bottom end surface of a rotor core. A spacer having an axial thickness slightly greater than that of the flange portion is arranged on a radially outer side of the flange portion. A bottom surface of the spacer makes contact with an end plate whose inner circumferential surface has a radius, centered about a central axis, smaller than a radius of the flange portion. The end plate is secured to the rotor core via a fixing member.

Abstract: After a winding machine connects a winding wire to a terminal pin, a slackening member is moved in a substantially horizontal direction substantially orthogonal to a direction of a terminal block being extended so as to be located on an orbit of the winding wire. Then, a led part of the winding wire radially between the terminal pin and teeth is extended to the teeth while in contact with a curved surface of a tip of the slackening member. That is, the led part is extended while bent in the substantially horizontal direction. After the winding wire is wound around the respective teeth, the slackening member is moved out of the orbit.