JP4557883B2 - Resolver device - Google Patents

Description

  The present invention relates to a resolver device, and more particularly to a resolver device that is used in an electric power steering device and that facilitates angle offset adjustment from the outside.

  Conventionally, this type of resolver device for detecting the rotation angle of a motor outputs an output from a power generation coil via an insulating member fixed to a stator as disclosed in, for example, Japanese Patent Laid-Open No. 2003-294488 or Japanese Patent Laid-Open No. 2004-173419. It is known to take it out.

  Japanese Patent Application Laid-Open No. 2003-158856 discloses that in an electric power steering apparatus, a resolver stator can be fixed or moved using an adjusting portion while being fitted inside an end bracket of a motor. It is described that it is.

JP 2003-294488 A JP 2004-173419 A JP 2003-158856 A

  However, according to Patent Documents 1 and 2, since the relationship between the stator core and the lead wire is firmly covered and fixed by an insulating member such as a thermoplastic resin, it is very effective with respect to the pull-out strength of the insulating extension. However, this kind of insulating member only constitutes a so-called connector portion, and corrects the phase shift between the resolver and the rotational phase detection rotor that occurs when the resolver is fixed to the motor end bracket with a bolt or the like. It is not used for anything. Therefore, it is difficult to correct this phase shift, and it is necessary to finish the system with a high system from the beginning, and it cannot be denied that it is an obstacle to mass production.

  On the other hand, according to Patent Document 3, the offset adjustment between the resolver and the detection rotor is performed each time when the resolver or the like is damaged and the resolver is replaced or the storage medium is replaced. It is considered that it must be done. That is, when the detection stator (stator) is assembled to the motor, the detection stator is fitted in the motor housing even if it is assembled at a position different from the predetermined position in the circumferential direction around the axis. As it is, it can be moved to a predetermined position in the circumferential direction and fixed at that position.

  However, in order to make the stator rotatable, it is necessary to engage a spring member that is separately formed with the motor housing so as to be integrated with the motor housing, which is disadvantageous in terms of complexity and cost. Further, since the spring member is rotated by a jig inserted through an adjustment hole provided in the motor housing, a separate jig is required, which increases the cost and makes adjustment complicated.

  An object of the present invention is to make it possible to easily adjust an offset of a detection angle by allowing a stator of a resolver to be rotated from the outside without requiring a special device.

The present invention is a resolver device that generates an output signal according to a rotor that rotates in synchronization with rotation of a motor,
A plurality of magnetic poles wound with a power generation coil for generating the output signal; a stator that is magnetically integrated with the magnetic poles and fixed to an end bracket of the motor; and a part of the stator in the outer circumferential direction And a grommet that is formed by being integrally joined to the generator coil and that leads the output signal to the outside of the motor by wiring the lead wire from the power generation coil, and the grommet can be rotated with respect to the motor casing and detected from the outside of the casing This is accomplished by making the angular offset adjustable.

  Preferably, the grommet is achieved by being sandwiched between the end bracket of the motor and the rear holder.

  Preferably, the grommet is achieved by being sandwiched between a guide rail formed concentrically with the rotating shaft on the outer end surface of the end bracket of the motor and a guide rail formed on the inner end surface of the rear holder.

  Preferably, the guide rail of the present invention is achieved by being formed on the outer peripheral edge of the end bracket of the motor and the inner peripheral edge of the rear holder, respectively, and engaging with the slit of the grommet.

  Preferably, the slit is formed on the entire circumference of the grommet, and the end surface in the rotation direction is engaged with the engaging end of the guide rail to determine the rotatable range.

  In the present invention, preferably, the grommet is made of an insulating resin material, and the assembly wire from the power generation coil is integrally resin-molded with an external take-out cable.

  Preferably, the grommet of the present invention is achieved by using any one of polyamide-based, polyolefin-based, and reactive urethane-based resins.

  The present invention takes out the lead wire from the power generation coil constituting the resolver to the outside of the motor casing through the grommet, and enables the resolver stator to be operated from the outside using the grommet. The detection angle offset can be easily adjusted from outside the body.

  FIG. 4 is a cross-sectional view of a main part in which a resolver device is mounted on a power steering drive motor. The motor unit is mounted on the inner periphery of a cylindrical casing 1 and is respectively wound with an exciting bobbin through an insulating bobbin. A plurality of stators 3, a rotor 4 that is disposed with a rotation gap in the stator 3, and a magnet that forms a rotating magnetic pole is mounted, and a shaft 5 that is fixed to the center of the rotor 4 is a bearing 6. The end brackets 7 and 71 are supported via 61, and the end brackets 7 and 71 are arranged so as to cover the opening of the casing 1 and are in a fitting relationship with each other to form a housing of the motor. Yes.

  In this type of motor, a current is supplied to the exciting coil 3 via the power harness 8 to drive the rotor 4 to rotate.

  Next, the resolver device will be described.

  As can be seen from FIG. 4, one end bracket 7 that supports the shaft 5 via bearings 6 and 61 is a disk member having a substantially convex cross section, and is attached to the distal end portion 51 of the shaft 5 that protrudes into the hollow portion 72. A rotor 9 that is laminated and formed separately is mounted with rotation prevention, and is mechanically fixed by a nut 10 that is screwed to the shaft tip 51.

  On the other hand, a cylindrical stator 11 disposed opposite to the rotor 9 with a rotation gap is fitted and disposed on the stamping portion on the inner peripheral surface of the hollow portion 72. A holding plate 12 formed in a horseshoe shape is superimposed on the outer peripheral end surface, and is fastened and fixed by a screw member 13 screwed to the end bracket 7.

The details of the stator 11 include a plurality of magnetic poles 14 projecting toward the center of the shaft and a back core 15 that magnetically connects these magnetic poles, as shown in FIGS. The generator coil 16 is applied by so-called concentrated winding via a not-shown).

  Next, the assembly of the resolver device which is the main part of the present invention will be described mainly with reference to FIGS. Each output line 16A of the power generating coil 16 is wound around the periphery of the back core 15 and taken out to the outside through a grommet 17 that is previously molded with the stator 11 and resin.

  The grommet 17 is made of a thermoplastic resin material extending from the periphery of the stator toward the outer peripheral direction, and includes a wiring portion 17A in which a plurality of intermediate metal terminals 18 are embedded, and a wiring embedded portion 17B in which an output lead wire 19 is embedded. The rotation operation portion 17C serving as a handle is integrally molded with resin.

  Here, the resin is selected from polyamide, polyolefin, and reactive urethane resins that have low injection pressure and can be used for insert molding and overmolding of electronic parts. The lead wire 19 is prevented from being disconnected. In addition, the resin in the previous period has excellent adhesion to materials such as nylon, PBT, ABS and the like, and the rotation operation portion 17C can firmly fix the cable 20.

  The resin molding is performed by holding the stator 11 including the magnetic pole 14 and the back core 15, a plurality of intermediate metal terminals 18 connected to the output lead wires, and the cable 20 with a molding die and filling the resin with the resin. The provided resolver and grommet 17 are integrally formed.

Then, the lead wires 16A of the respective power generation coils 16 wound around the bobbins are led to the intermediate metal terminal 18 that is partially exposed on the upper surface in the axial direction of the wiring buried portion 17B, and soldered or the like. Connected. On the other hand, the output lead wire 19 is connected to the intermediate metal terminal 18 in advance as described above, and the free end of the cable 20 is connected to a connector (not shown) for sending an output signal to an attached device. Here, the lead wire 16A is coated with the intermediate metal terminal 18 with varnish or the like, insulated from the surroundings, and firmly fixed.

  The resolver device configured as described above is attached to the tip 51 of the shaft 5 as an assembly (FIGS. 1 and 2) and is assembled into the end bracket 7, but the wiring embedded part 17B of the grommet 17 and the rotating operation part Arc grooves 17D and 17E that are concentric with the shaft are provided on the upper and lower surfaces between 17C, and cut grooves 17F and 17G are provided in advance on both side surfaces thereof. As shown in FIG. 3, the arc groove 17D is fitted to a guide rail 73 provided on the outer peripheral surface of the end bracket 7 with a predetermined length with a sliding gap so that the grommet 17 is moved within a predetermined range. Although it can be freely rotated, the rotation range is ± 6 °, and the side edge portion 17b of the wiring embedded portion 17B is regulated by being abutted against the stepped surface 7a of the end bracket 7.

  The rear holder 21 shown in FIG. 4 is made of a resin material, is formed in a bowl shape, is arranged so as to cover the upper surface of the end bracket 7 of FIG. 4, and is screwed into a screw hole 74 provided in the end bracket 7 with several screws 22. Is done. The rear holder 21 is provided with a notch in a part of the peripheral wall 21A so as to be wider than the fitting width L (see FIG. 3) of the grommet 17 and leaving a part 21a fitted in the arc groove 17D. Can be rotated from the outside within the specified range.

  The rotation angle of the resolver device configured as described above is adjusted while viewing the voltage waveform output from the power generation coil 16 of the resolver with an oscilloscope or the like while rotating the motor.

  That is, the resolver stator 11 is rotated manually by moving the grommet 17 in the left or right direction of the rotation direction, and the phase difference between the induced voltage of the motor and the voltage waveform output from the power generation coil 16 of the resolver. Is adjusted within a range of 0 ° ± 1 °, for example.

  After obtaining the sensor angle in this way, the screw member 13 is fastened to the end bracket 7 with the sensor angle as a specified position, and the stator 11 of the resolver is fixed. After that, the mounting angle adjustment of all resolvers is completed by covering the rear holder 21 and fixing the screws 22.

On the other hand, when the rotor 9 or the stator 11 needs to be inspected or adjusted, the rear holder 21 is removed, the screw member 13 is loosened, and the grommet 17 is rotated and adjusted from the outside in the same manner as in the above assembly, so that a predetermined sensor angle is obtained. Can be easily obtained. These configurations are particularly susceptible to mechanical adjustments and other adjustment angles, such as electric power steering for vehicles that are used under severe conditions, or electrical wiring breakage or dielectric breakdown is likely to occur. What happens is a particularly advantageous one.

  Further, since the output wire 16A of the power generation coil 16 is connected to the output lead wire 19 led out of the grommet 17 via the intermediate metal terminal 18, the output is performed even if a tensile stress is applied to the output lead wire 19 from the outside. An external force is not directly applied to the line 16A, and there is an advantage that the grommet 17 can be rotated with a sense of security.

  Furthermore, since the grommet is integrally molded with resin and embedded with wiring components, the grommet becomes stronger against external forces.

The assembly front view of the resolver apparatus in the Example of this invention. The principal part vertical side view in FIG. The front view of the motor incorporating the resolver apparatus in the Example of this invention. The principal part vertical side view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Casing, 5 ... Shaft, 7, 71 ... End bracket, 11 ... Stator,
14 ... Magnetic poles, 16 ... Power generation coils, 16a ... Lead wires, 17 ... Grommets.

Claims (7)

A resolver device that generates an output signal according to a rotor that rotates in synchronization with rotation of a motor,
A plurality of magnetic poles wound with a power generation coil for generating the output signal; a stator that is magnetically integrated with the magnetic poles and fixed to an end bracket of the motor; and a part of the stator in the outer circumferential direction And a grommet that is formed by being integrally joined to the generator coil and that leads the output signal to the outside of the motor by wiring the lead wire from the power generation coil, and the grommet can be rotated with respect to the motor casing and detected from the outside of the casing A resolver device characterized in that an angle offset can be adjusted.   2. A resolver device according to claim 1, wherein the grommet is sandwiched between the end bracket of the motor and the rear holder.   3. The grommet according to claim 1, wherein the grommet is sandwiched between a guide rail formed concentrically with the rotating shaft on the outer end surface of the end bracket of the motor and a guide rail formed on the inner end surface of the rear holder. Resolver device.   4. A resolver device according to claim 3, wherein the guide rails are respectively formed on an outer peripheral edge portion of the end bracket of the motor and an inner peripheral edge portion of the rear holder, and are engaged with a slit of the grommet.   5. The resolver device according to claim 4, wherein the slit is formed on the entire circumference of the grommet, and the end surface in the rotation direction is engaged with the engaging end of the guide rail to determine the rotatable range.   4. A resolver device according to claim 3, wherein the grommet is made of an insulating resin material, and the assembly wire from the power generation coil is integrally molded with an external take-out cable. 2. A resolver according to claim 1, wherein the grommet is made of any one of polyamide, polyolefin, and reactive urethane resins.

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