JPH059180U - Spindle motor - Google Patents

Abstract

(57) [Summary] [Structure] A stator composed of a disk-shaped stator core provided with an armature coil, a bearing holder fixed to the inner periphery of the stator, and an outer periphery of the stator core. A ring-shaped rotor made of permanent magnets facing each other with a gap, a rotary table having a cylindrical portion for fixing the rotor, and a spindle fixed in the central portion, and a printed board attached to the bearing holder. In a spindle motor including: a concave portion is formed on a portion of the printed circuit board facing the armature coil, or on the outer peripheral side of the fixed iron core, and the concave portion accommodates the portion of the armature coil on the printed circuit board side. There is. [Effect] Since the spacer is unnecessary, the structure of the motor is simplified and the assembly is facilitated. Also, the motor can be made thinner.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a spindle motor used in a floppy disk drive device or a drive device for audiovisual equipment.

[0002]

[Prior Art]

 The structure of a conventional spindle motor is shown in FIG. In the figure, 1 is a bearing holder, 2 is a stator, which is composed of a disk-shaped stator core 4 having an armature coil 3 on its outer peripheral portion, and is fixed to the bearing holder 1. A ring-shaped rotor 5 is composed of a permanent magnet that faces the outer circumference of the stator core with a gap. 6 is a rotary table, which has a cylindrical portion 7 for fixing the rotor. Reference numeral 8 denotes a spindle, which is fixed to the rotary table 6 and is supported on the inner peripheral side of the bearing holder 1 via a bearing 9. Reference numeral 10 denotes a print substrate composed of a metal core substrate or the like, which is attached to the bearing holder 1 and has electronic components constituting a control circuit mounted thereon. A spacer 11 is inserted between the stator core 4 and the printed circuit board 10 to secure a space for the armature coil 3. Reference numeral 12 is a screw for fastening and fixing the stator core 4, the spacer 11 and the printed circuit board 10 to the bearing holder 1.

[0003]

[Problems to be solved by the device]

 However, such a conventional spindle motor has the following problems. The spacer 11 is required as a separate component to secure the space for the armature coil 3 between the stator core 4 and the printed circuit board 10, and the assembly is troublesome. Since the spacer is mounted inside the motor, it hinders the thinning of the motor. The present invention has been made in order to solve such a problem, and an object thereof is to simplify the structure of the motor, facilitate the assembling, and make the motor thinner.

[0004]

[Means for Solving the Problems]

 In order to achieve this object, the spindle motor of the present invention has a concave portion formed on the printed circuit board facing the armature coil or on the outer peripheral side of the fixed iron core. I am trying to store the part.

[0005]

[Action]

 With this structure, the space for the armature coil can be secured by the printed circuit board or the stator core itself, and the spacer is unnecessary.

[0006]

【Example】

 A first embodiment of the present invention will be described with reference to FIG. In the figure, the same reference numerals as those in FIG. 3 indicate the same or corresponding parts, and the description thereof will be omitted. The printed circuit board 10 has a recess 13 formed in the axial direction at a portion facing the armature coil 3 by, for example, drawing. The size of the recess 13 is the thickness of the spacer of the related art, that is, the size of the space for the armature coil 3, and the recess 13 accommodates the portion of the armature coil 3 on the printed circuit board side. As a result, the printed circuit board 10 is directly sandwiched between the stator core 4 and the bearing holder 1 without a spacer, and the axial dimension of the motor is shortened. FIG. 2 shows a second embodiment of the present invention, in which a concave portion 14 is formed on the outer peripheral side of the stator core 4, and the concave portion 14 accommodates the portion of the armature coil 3 on the printed circuit board side. ing. In this case as well, the printed circuit board 10 is directly sandwiched between the stator core 4 and the bearing holder 1 without a spacer, and the axial dimension of the motor is reduced in the central portion of the motor.

[0007]

[Effect of the device]

 As described above, according to the present invention, the concave portion is formed on the portion of the printed circuit board facing the armature coil or on the outer peripheral side of the fixed core, and the printed circuit board side armature coil is housed in the concave portion. Since the spacer is unnecessary, the following effects are obtained. The structure of the motor is simplified and thus the assembly is facilitated. The motor can be made thinner.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a first embodiment of the present invention.

FIG. 2 is a side sectional view showing a second embodiment of the present invention.

FIG. 3 is a side sectional view showing a conventional example.

[Explanation of symbols]

 1 Bearing Holder 2 Stator 3 Armature Coil 4 Stator Iron Core 5 Rotor 6 Rotary Table 7 Rotary Table Cylindrical Part 8 Spindle 9 Bearing 10 Printed Circuit Board 11 Spacer 12 Screw 13 Printed Circuit Board Depression 14 Stator Iron Core Depression

Claims (1)

[Claims for utility model registration] 1. A stator comprising a disk-shaped stator core provided with an armature coil, a bearing holder fixed to an inner peripheral portion of the stator, and the stator. A ring-shaped rotor made of permanent magnets facing the outer circumference of the iron core with a gap, a rotary table having a cylindrical portion fixing the rotor, and a bearing fixed to the rotary table on the inner peripheral side of the bearing holder. In a spindle motor provided with a spindle supported through and a printed circuit board attached to the bearing holder, a portion facing the armature coil of the printed circuit board or a concave portion is formed on the outer peripheral side of the fixed iron core, A spindle motor characterized in that the printed circuit board side portion of the armature coil is housed in this recess.