Abstract: A resolver unit having a structure in which the axial length is shortened to prevent the magnetic coupling characteristic between the rotary and stationary sides from being impaired, a winding generates more magnetic fluxes, and multiplexing is easily conducted, and also a resolver using such a resolver unit are provided.

Abstract: A flat resolver, which has a magnetic path forming a magnetic flux effectively linking to a secondary winding and a detection winding and has a uniform gap between a stator portion and a movable portion so that a resolver signal can be output with high precision, is provided. The flat resolver includes: plate portions of a stator core and a movable core, which are made of a magnetic material and are disposed in parallel with each other; a plurality of magnetic pole portions protruding from opposed surfaces of the plate portions; coil arranged-wiring substrates disposed around each of the magnetic pole portions; transformer winding cores disposed on the plate portions; and transformer winding arranged-wiring substrates disposed on the transformer winding cores.

Abstract: A stator stack and stator jig assembly provide a consistent amount of slack in stator coil wires without increasing the complexity of coil-winding machines or adding production steps, and prevent crossing of the stator coil wires in the slack areas. A stator stack having magnetic pole teeth is mounted in a stator installation jig, and the ends of slack forming plates having grooves are made to project above the top surface of the stator stack to thrust stator coil wires upwardly. The coil-winding machine winds stator coil wires around the magnetic pole teeth, and after the stator coil wires are wound, the ends of the stator coil wires are passed through grooves in the ends of the plates to output pins. The coil-winding machine wraps the ends of the stator coil wires around the output pins. On removing the stator from the stator installation jig, the parts of the stator coil wires which where thrust upward become slack areas.

Abstract: A double variable reluctance resolver in which a redundancy is given to a variable reluctance resolver to improve reliability. The double variable reluctance resolver also functions as a multiple speed resolver system.

Abstract: A rotation angle sensor that outputs different axis combination angles as absolute position information by forming a range of salient poles that have different axis combination angles from each other on the rotor and the stator.

Abstract: A variable reluctance resolver has a rotor with magnetic poles with 2× or greater axis combination angles, and is structured so that reliable and accurate zero point detection can be carried out. Concave and convex portions are provided on at least two, but fewer than all, of the magnetic poles of the rotor, and the zero point detection winding is provided on a plurality of electrical poles of the stator. Two or more zero point detection signals are generated simultaneously by a plurality of zero point detection windings. Therefore, even if a portion of the zero point detection signals is lost, the zero point can still be identified based on the correlation between the two or more zero point detection signals.

Abstract: A slack-forming mechanism for stator coils that is able to impart slack of appropriate size to the stator coil without imposing an excessively heavy burden on the coiling machine. The slack-forming mechanism includes a coiling machine attachment jig having a protruding member that passes through a clearance formed between a stator body and connector, and has a top edge positioned higher than a clearance pass-through part of a stator coil. As it is possible to form slack in the stator coil without changing the configuration of the coiling machine, deficiencies in prior art slack-forming mechanisms are overcome such as the difficulty of maintaining uniform slack amounts, and unreliability. Moreover, since design-related restrictions are few, an adequately large slack is imparted to the stator coil to adequately suppress breakage of the stator coil induced by temperature change.

Abstract: A deviation angle detector enlarges the application range by enlarging the detectable deviation angle range. The deviation angle detector has two resolvers, which have rotors, stators, and single excitation windings and multiple output windings that are coiled around the stators. The difference in rotation angles of the resolvers is detected as a deviation angle ?? by calculating the output signal that corresponds to the rotation angles of the resolvers digitally or in analog. The corresponding output windings of the resolvers are connected in series and the output signals are extracted from the serially connected output windings and calculated digitally or in analog.

Abstract: A slack-forming mechanism for stator coils that is able to impart slack of appropriate size to the stator coil without imposing an excessively heavy burden on the coiling machine. The slack-forming mechanism includes a coiling machine attachment jig having a protruding member that passes through a clearance formed between a stator body and connector, and has a top edge positioned higher than a clearance pass-through part of a stator coil. As it is possible to form slack in the stator coil without changing the configuration of the coiling machine, deficiencies in prior art slack-forming mechanisms are overcome such as the difficulty of maintaining uniform slack amounts, and unreliability. Moreover, since design-related restrictions are few, an adequately large slack is imparted to the stator coil to adequately suppress breakage of the stator coil induced by temperature change.

Abstract: A resolver unit having a structure in which the axial length is shortened to prevent the magnetic coupling characteristic between the rotary and stationary sides from being impaired, a winding generates more magnetic fluxes, and multiplexing is easily conducted, and also a resolver using such a resolver unit are provided.

Abstract: A variable-reluctance resolver includes a rotor and a stator. The rotor includes axially connected first and second rotor portions. The first rotor portion has n salient poles provided about a center axis at uniform angular intervals, where n is an arbitrary integer not less than 3. The second rotor portion has (n?1) salient poles provided about the center axis at uniform angular intervals. The stator has a plurality of magnetic poles provided on an inner circumferential surface thereof. An excitation coil and output coils for shaft angle multipliers of n× and (n?1)× are provided on the magnetic poles in order to output sine and cosine outputs having a phase difference of 90 degrees therebetween. A rotational angle sensor includes the VR resolver and a calculation section for calculating a resolver signal for a shaft angle multiplier of 1× from signals output from the VR resolver.

Abstract: A flat resolver, which has a magnetic path forming a magnetic flux effectively linking to a secondary winding and a detection winding and has a uniform gap between a stator portion and a movable portion so that a resolver signal can be output with high precision, is provided. The flat resolver includes: plate portions of a stator core and a movable core, which are made of a magnetic material and are disposed in parallel with each other; a plurality of magnetic pole portions protruding from opposed surfaces of the plate portions; coil arranged-wiring substrates disposed around each of the magnetic pole portions; transformer winding cores disposed on the plate portions; and transformer winding arranged-wiring substrates disposed on the transformer winding cores.

Abstract: A VR resolver includes a stator yoke having a plurality of magnetic-pole portions; a rotor having a salient-pole portion; an excitation coil; and a plurality of output coils. The stator yoke and the rotor form an annular, hollow structure having a rectangular radial cross section. The excitation coil is provided in the hollow portion of the annular, hollow structure. The output coils are provided at the corresponding magnetic-pole portions of the stator yoke.

Abstract: A multiplex resolver includes m resolver units disposed in tandem each comprising a rotor and a stator, where m is an integer not less than 2. The stator has a stator yoke, a plurality of stator magnetic poles projecting from the yoke, and excitation and output windings applied to the stator magnetic poles. The number of the stator magnetic poles corresponds to a shaft angle multiplier nX (n is an integer not less than 1) of the resolver. The rotor has n salient poles in accordance with the shaft angle multiplier nX. The respective stators of the resolver units are connected together such that the stator magnetic poles of the stator of one resolver unit do not overlap the stator magnetic poles of the stator of another resolver unit, as viewed in the axial direction.

Abstract: A stator device which prevents the formation of varnish accumulations on jumper wires, thereby preventing jumper wire breakage due to temperature variations. A gap is created between the jumper wire and the stud located on the stator body. When varnish is applied to the stud and the jumper wires, excess varnish flows through the gap and pools underneath. Moreover, when there is a significant accumulation of varnish in the gap, the varnish will flow off from the edge of the stator body.

Abstract: A high-accuracy, 1X VR resolver includes a first rotor portion having (N?1) salient poles, where N is an arbitrary integer not less than 3, a second rotor portion having N salient poles, a first stator portion having an input coil and an output coil for a shaft angle multiplier of (N?1)X are provided, and a second stator portion having an input coil and an output coil for a shaft angle multiplier of NX. A first resolver unit composed of the first rotor portion and the first stator portion, and a second resolver unit composed of the second rotor portion and the second stator portion are disposed in front and rear stages, respectively. The output coil of the stator portion in the front stage is connected to the input coil of the stator portion in the rear stage in such a manner that the output coil of the stator portion in the rear stage outputs an output signal for a shaft angle multiplier of 1X.

Abstract: A spacer 2 is provided between an inner core 62 and a resolver rotor 63, which are respectively attached to a rotary shaft 68. A cutout groove 42 is formed at a flange 41 of the inner core 62. A fixing groove 3 and the cutout groove 42 are aligned in the rotary shaft 68 direction. The rotary transformer output winding 65 and resolver excitation windings 64 are soldered and electrically connected by a crossover 60. The crossover 60 is covered with an insulating tube 6. The crossover 60 is fitted into the fixing groove 3. The fixing groove 3 and an inter-magnet space 631 are misaligned in the circumferential direction of the rotor 63. Thus, a frictional force is applied between the insulating tube 6 and the fixing groove 3, which secures the crossover 60 and prevents the crossover 60 from escaping from the fixing groove 3.

Abstract: A variable-reluctance resolver includes a rotor and a stator. The rotor includes axially connected first and second rotor portions. The first rotor portion has n salient poles provided about a center axis at uniform angular intervals, where n is an arbitrary integer not less than 3. The second rotor portion has (n-1) salient poles provided about the center axis at uniform angular intervals. The stator has a plurality of magnetic poles provided on an inner circumferential surface thereof. An excitation coil and output coils for shaft angle multipliers of n× and (n-1)× are provided on the magnetic poles in order to output sine and cosine outputs having a phase difference of 90 degrees therebetween. A rotational angle sensor includes the VR resolver and a calculation section for calculating a resolver signal for a shaft angle multiplier of 1× from signals output from the VR resolver.

Abstract: A high-accuracy, 1X VR resolver includes a first rotor portion having (N?1) salient poles, where N is an arbitrary integer not less than 3, a second rotor portion having N salient poles, a first stator portion having an input coil and an output coil for a shaft angle multiplier of (N?1)X are provided, and a second stator portion having an input coil and an output coil for a shaft angle multiplier of NX. A first resolver unit composed of the first rotor portion and the first stator portion, and a second resolver unit composed of the second rotor portion and the second stator portion are disposed in front and rear stages, respectively. The output coil of the stator portion in the front stage is connected to the input coil of the stator portion in the rear stage in such a manner that the output coil of the stator portion in the rear stage outputs an output signal for a shaft angle multiplier of 1X.

Abstract: A dual resolver device that includes a first resolver having a first rotary shaft, and a second resolver having a second rotary shaft, wherein the absolute value of a difference between a shaft angle multiple of the first resolver and a shaft angle multiple of the second resolver is 1. In one embodiment, the dual resolver device further includes a torsion bar connecting the first and second rotary shafts. In another embodiment, the first and second rotary shafts constitute different portions of the same rotary shaft. In either embodiment, the first resolver preferably produces an output indicative of a rotation angle of the first rotary shaft, and the second resolver preferably produces an output indicative of a rotation angle of the second rotary shaft. The dual resolver device preferably further includes a processor that determines an absolute shaft rotation angle in response to the first and second outputs, and the shaft angle multiples of the first and second resolvers.