JPH0615517Y2 - Motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a motor having a frequency generator that outputs a signal having a frequency proportional to the rotational speed or a wave number proportional to the rotational angle.

(Prior Art) Motors used for tape recorder capstan motors, computer card readers, measuring instruments, etc. must maintain accurate rotation speeds. Therefore, control the rotation speeds with a speed control circuit using a servo system. There is. Further, when used for setting the position of the arm of the machining robot, the position of the cutting tool of the machine tool, etc., the position is controlled because an accurate position is required. These control systems are conventionally performed by the system shown in FIG. In the figure, a power source 1 supplies a DC voltage to a motor 3 via a drive unit 2 that controls rotation, and a motor 3
To rotate. Reference numeral 4 denotes a rotation speed or position detector, and an electric signal proportional to the detected rotation speed or position is compared with a reference value by a comparator 5. The drive unit 2 controls the rotation speed or position of the motor 3 by adjusting the voltage or current applied to the motor 3 so as to erase the error signal obtained by the comparator 5.

In order to obtain a signal of a frequency proportional to the rotation speed as the detector 4, a method of using a frequency generator that is directly connected to the rotation shaft of the motor 3 and rotates together with the rotation of the motor 3 is used because the price is low.

By the way, a pulse control method, a PLL control method, and the like are used for these rotation speed control and position control, and particularly, PLL control is used for audio precision equipment,
A pulse waveform is used as a signal for that purpose. Since the output obtained by the method using this frequency generator is a sine wave signal, it is converted into a pulse waveform by the circuit shown in FIG.
(A) is a circuit diagram for converting a sine waveform into a pulse waveform, and (b) is an output waveform thereof. In the figure, the same parts as those in FIG. 2 are designated by the same reference numerals. In the figure, 6 is a frequency generator, the motor body 7 is composed of the motor 3 and the frequency generator 6, and the output signal A of the motor body 7 is the sine wave of A in FIG. Since the pulse wave is required as the output waveform as described above, the waveform conversion circuit 8 is connected to the output side of the motor body 7 to obtain the output B. The output pulse waveform (b) view of the _{B 1} or _{B 2} waveforms, _{B 1} and B
Reference numeral ₂ is a waveform whose phase is shifted by 180 ° and outputs one of the waveforms as needed.

(Problems to be solved by the invention) Since the waveform deforming circuit 8 is attached to the outside of the motor main body 7 as shown in the figure, the lead wire should be routed from the frequency generator 6 and connected to the waveform converting circuit 8. As a result, noise may be superimposed on the output waveform A and the waveform conversion circuit 8 may malfunction to obtain the desired output waveform.
Therefore, in order to obtain a good output waveform by improving the SN ratio, it is necessary to increase the power of the output signal of the frequency generator 6 to obtain a sufficient margin, and the frequency generator 6 becomes large. There was a flaw.

The present invention has been made in view of the above problems, and an object thereof is to obtain a pulse wave having a favorable waveform without increasing the power of an output signal and to increase the size of a frequency generator. And not to realize a motor.

Another object is to realize a compact motor that requires a small number of mounting steps and mounting parts for mounting a circuit board for obtaining a pulse wave output signal on a frequency generator.

(Means for Solving the Problems) The present invention for solving the above problems includes a motor having a frequency generator that outputs a signal having a frequency proportional to the rotation speed or a wave number proportional to the rotation angle. Provide a waveform conversion circuit that converts the output waveform of the machine to a pulse waveform,
At least two metal terminals are mounted on the coil bobbin of the frequency generator, the lead wire of the coil of the frequency generator is connected to the metal terminal, and the metal terminal is used as a printed circuit board of the waveform conversion circuit. It is characterized in that the waveform conversion circuit board is fixed to the frequency generator by soldering.

(Function) A metal terminal is attached to the coil bobbin of the frequency generator, the lead wire of the coil is connected, and the printed wiring part of the printed circuit board of the waveform conversion circuit is soldered to the long connection piece of the terminal to form the waveform conversion circuit. The substrate is mechanically fixed to the frequency generator and at the same time electrically connected, and a pulse wave having a frequency proportional to the rotation speed of the motor or a wave number proportional to the rotation angle is output.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view of a motor according to an embodiment of the present invention. In the figure, only the main part will be described. This motor is a cup-shaped coreless motor. In the figure, 11 is a coil former in which an armature coil 12 is wound around the outer circumference, and has a cup shape, and a permanent magnet 13 is housed therein. Reference numeral 14 denotes a housing holding the support 13 to which the permanent magnet 13 is attached, and the opposite side of the housing 14 having the support 15 is covered with a cover 16. A bearing 17 is attached to the support 15 and a bearing 18 is attached to the cover 16 to support the shaft 19. Reference numeral 20 is a commutator to which a coil is connected and which is supplied with a direct current by a brush 21. . The above housing 14 and cover 1
The motor 3 is housed inside 6.

An FG cap attached to the cover 16 by welding on the outside of the cover 16 (FG is an abbreviation for a frequency generator)
A frequency generator 6 covered with 30 is provided. 31
Is an FG disc in which about 50 to 150 teeth are engraved around a ferromagnetic disk, which is attached to the shaft 19 via a mounting member 32 and rotates together with the shaft 19. Reference numeral 33 is a cylindrical FG magnet made of a rubber magnetic material, which is attached to the entire inner peripheral surface of the FG cap 30 and alternately forms N and S magnetic poles in the circumferential direction. Reference numeral 34 denotes a coil bobbin which is mounted inside the upper surface of the FG cap 30 by caulking to a cylindrical mounting portion provided at the center of the FG cap 30, around which a coil 35 is wound. Reference numeral 36 denotes an FG terminal attached to the upper surface of the coil bobbin 34 by adhesion, which is a hook-shaped terminal having long and short connecting pieces as shown in the figure. An insulating plate 37 prevents the conductors on the bottom surface of the printed board 38 and the leads of the electronic component 39 from coming into contact with the FG cap 30 and short-circuiting. Reference numeral 38 denotes a printed circuit board which is mechanically fixed by soldering at a fishhook-shaped long handle portion of the FG terminal 36 and electrically connected to a printed wiring portion.
The electronic component 39 is attached to the upper surface thereof. 40 is a cover 1 for covering the frequency generator 6 and the waveform conversion circuit 8.
With the cap attached to 6, a grommet 41 is attached to the lower end of the cap 40 in the vicinity of the cover 16, and the output lead wire 42 is passed therethrough. The output lead wire 42 is soldered to the printed circuit portion of the printed circuit board 38 and is drawn out from the lower surface through a hole.

Next, a method of mounting the frequency generator 6 and the printed circuit board 38 of the waveform conversion circuit 8 of the above embodiment on a motor and the operation of the motor configured as described above will be described. FG disc 3
The mounting bracket 32 to which 1 is attached is press-fitted onto the shaft 19 to be fixed, and the FG cap 30 is attached to the cover 16 by welding. The coil 35 is attached to the step portion of the coil bobbin 34 by crimping the tip of the folded portion provided in the central hole of the FG cap 30, and the lead wire of the end of the coil 35 is attached to the hook portion of the tip of the fishhook-shaped FG terminal 36. The FG terminal 36 is exposed to the upper surface through the hole of the printed circuit board 38 and is fixed to the printed wiring portion by soldering. By this soldering, the input end of the waveform conversion circuit 8 and the coil 35 are electrically connected at the same time, and the sine wave signal output of the frequency generator 6 is supplied to the pulse conversion circuit 8.

In the above motor, a DC current is applied to the armature coil 12 wound around the coil former 11 around the magnet 13 from a DC power supply (not shown) via the brush 21, and the armature coil 12 surrounds the magnet 13. Is rotated together with the shaft 19. Axis 1
As the FG disk 31 rotates, the FG disk 31 rotates while cutting the magnetic poles in which the N and S poles of the FG magnet 32 are alternately arranged by the teeth engraved on the outer circumference of the FG disk 31, so that the FG disk 31 has a sine wave of a frequency proportional to the number of teeth. A wave signal is induced in the coil 35.
The sine wave signal induced in the coil 35 is input to the waveform conversion circuit 8 provided on the printed circuit board 38 via the FG terminal 36 and converted into the waveform of B ₁ or B ₂ shown in FIG. Is output.

As described above, the frequency generator 6 and the waveform conversion circuit 8
Since they are directly connected to each other, external noise is not picked up and malfunction does not occur, and good pulse output can be obtained without increasing the power of the sine wave output signal of the frequency generator 6, and the waveform conversion circuit 8 Combined with the fact that it is built into the motor body, it has become possible to reduce the size of the entire system. In addition, the frequency generator 6 using the hook-shaped FG terminal 36
And the board of the waveform conversion circuit 8 are attached, a single F
With the G terminal 36, it was possible to perform mechanical fixing and electrical connection with a single soldering treatment per location, and it was possible to reduce the assembly process and the number of parts. In the present embodiment using the hook-shaped FG terminal 36, the lead wire of the coil is soldered to the short connecting piece and then the long connecting piece is soldered to the printed board 38. There is no hindrance when it is attached to the printed wiring board 38, and there is no fear that the connecting portion of the coil will melt when the long connecting piece is soldered to the printed circuit board 38.

The present invention is not limited to the above embodiment. For example, the motor is not limited to the coreless motor, a print motor may be used, and any motor having a small moment of inertia may be used. Further, the shape of the FG terminal is merely an example, and an L-shaped or rod-shaped terminal may be used regardless of the shape.

(Effect of the Invention) As described above, according to the present invention, a pulse wave having a good waveform can be obtained without increasing the power of an output signal, and a small frequency generator is provided, and a waveform conversion circuit is provided. It is possible to realize a compact motor with a small number of mounting parts and a mounting man-hour for mounting the board on the frequency generator, which is a great practical effect.

[Brief description of drawings]

FIG. 1 is a sectional view of a motor according to an embodiment of the present invention, FIG. 2 is a diagram of a motor control system, and FIG. 3 is an explanatory diagram of a conventional method of converting a waveform of a frequency generator output. DESCRIPTION OF SYMBOLS 1 ... Power source, 2 ... Drive part 3 ... Motor, 4 ... Detector 5 ... Comparator, 6 ... Frequency generator 7 ... Motor main body, 8 ... Waveform conversion circuit 11 ... Coil former, 12 ... Armature coil 13 ... Magnet, 14 ... Housing 15 ... Support, 16 ... Cover 19 ... Shaft, 30 ... FG cap 31 ... FG disc, 32 ... Mounting bracket 33 ... FG magnet, 34 ... Coil bobbin 35 ... Coil, 36 ... FG terminal 37 ... Insulation plate, 38 ... Printed circuit board 39 ... Electronic parts, 40 ... Cap

Claims (1)

[Scope of utility model registration request] 1. A motor having a frequency generator that outputs a signal having a frequency proportional to a rotation speed or a wave number proportional to a rotation angle, and a waveform conversion circuit for converting an output waveform of the frequency generator into a pulse waveform, At least two metal terminals are mounted on the coil bobbin of the frequency generator, the lead wire of the coil of the frequency generator is connected to the metal terminal, and the metal terminal is used as a printed circuit board of the waveform conversion circuit. A motor characterized in that the waveform conversion circuit board is fixed to the frequency generator by soldering.