JPS59136067A - Noise reducing mechanism of linear pulse motor - Google Patents

Abstract

PURPOSE:To reduce a noise due to vibration of a scale by fastening a scale body formed with a toothed part in a linear pulse motor on an equipment body through an elastic material having small spring constant, and moving the primary side. CONSTITUTION:Wheels 12-15 are rotatably provided at shafts 10, 11 at cores 2, 3 on the back surfaces of which permanent magnets 6, 7 are respectively arranged, coils 9a-9d are respectively wound on poles 2a, 2b, 3a, 3b formed with toothed parts which are displaced by 1/4 from each other to form the primary side. The secondary side is formed of a scale 16 having a toothed part 16a of a constant pitch, a spring constant is sufficiently reduced, the secondary side is fastened to an equipment body 17 through springs 19a, 19b having reduced vibration transmission rate, and the primary side is moved. Accordingly, the vibration of the scale 16 occurred during the operation is not transmitted to the body 17, and the vibration and noise produced from the body 17 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to noise prevention for linear pulse motors.

-B, the linear pulse motor steps the -next side or secondary side scale in steps by a fixed distance (usually 1./4 pitch for a 4-ball type) for each input pulse supplied by the primary coil number. Move forward.

Along with this operation, linear pulse smoke is applied to office automation equipment such as head feeding of various printers and photoelectric reading devices that require accurate positioning control.

The conventional structure of this linear motor is shown in FIGS. 1 and 2. That is, Fig. 1 is a partially cutaway normal iMj diagram, and Fig. 2 is a partially cutaway side view. In each figure, 1 is the primary side responsible for generating magnetic flux of the linear pulse motor, and the magnetic Two iron cores 2, 3. Side plates 4 for fixing the cores 2 and 3 on both sides. ．． 5. Permanent magnets 6, 7 magnetized with the polarities shown on the back of each of the iron cores 2, 3, the permanent magnets 6, 7
magnetic plate 8 to be joined to the back surface of the magnetic plate 8, coils 9a+9b+9c+9 branches attached to the magnetic poles 2a, 2b, 3a, 3b formed on each of the above-mentioned iron cores 2 and 3, each side plate 4,
It consists of wheels 12-15 rotatably supported on shafts 10.11 supported below both sides of the wheel. Each of the magnetic poles 2a, 2b, 3a, and 3b has 1. Tooth portions 2a1, 2b1, 3a1, 3 with a deviation of /4 pitch
b1 is formed.

16 is the scale that forms the secondary side of the linear pulse smoke,
A tooth portion 16a having the same pitch as each magnetic pole tooth portion 2a1 is formed on the plane, and both ends of the secondary scale 16 are connected to the equipment main body 17 and poles 18a, 18b, etc. to which the linear pulse motor is normally attached. Fixed.

In the linear pulse motor shown in FIGS. 1 and 2, for example, when driving by the − phase excitation method, in the process of sequentially exciting each filter 9a to 9d, −C1 each magnetic pole 2a+ 2b , 3a, toothed portion 2a formed on 3b
l, 2b].

3al and 3bl are sequentially θ (by opposing the tooth part of the secondary side scale), /4bi, chi step by step (it looks continuous, but in principle, 2 is just a step-like displacement), Generates thrust.

With the above configuration and operation, the linear pulse motor can be put into practical use.
An electromagnetic attractive force is generated between the secondary magnetic flux generator 1 and the secondary scale 16. Since this electromagnetic attractive force changes in steps 'uM, the primary magnetic flux generator 1 and the secondary scale 16
, which causes vibrations and noise. In the linear pulse smoke with the conventional configuration, this vibration is directly transmitted to the equipment main body, because the secondary scale 16 is fixed to the equipment main body to which the iM I linear pulse motor is attached, as described above. The drawback was that vibration and noise increased due to resonance phenomena in the device itself.

The present invention has been made to eliminate the above-mentioned drawbacks, and by avoiding direct fixation of the secondary scale of the linear pulse motor to the main body of the equipment from which the linear pulse motor can be accessed, vibrations in the main body of the equipment can be avoided.・The purpose is to reduce noise.

Next, an embodiment of the present invention will be described based on FIGS. 3 and 4.

Fig. 3 shows the connection part between the secondary scale of the linear pulse smoke and the main body of the device that takes the linear pulse motor, 16 is the secondary scale, 16a is the tooth part,
The secondary scale 16 and tooth portion 1 in FIG.
6a and correspond respectively. 19a, ]-9b are plate springs, one end of which is connected to the end of the above skeleton 16) 20a, M, the total spring constant of the plate springs 19a, 19b, K, the damping constant of the entire plate spring 1 arc 19b, etc. is C, the electromagnetic excitation force is P, the displacement amplitude of the scale 16 is x1, the force transmitted to the device body 17 is FT
, when the angular frequency of the electromagnetic excitation force is ω, the vibration transmissibility 7 can be expressed by the following equation.

Here, using the above equation, the relationship between the frequency ratio ω/ωO and the vibration transmissibility γ is expressed as 0.005.0.10.0.20.0.
50.1.0 is expressed as shown in Figure 4.Q A, B, C.

It can be expressed as D, E, F. From this Figure 5, the vibration transmissibility ヱ is determined by the frequency ratio (IJ/(frequency ratio f) which reaches a peak when IJ O is approximately 1). Here, in order to increase the vibrational indoctrination or10noo, the angular frequency ω is
It is necessary to make 0 small, and for this purpose, it is best to make the spring constant K small. Therefore, if the spring constant K is made smaller, the vibration transmissibility γ becomes smaller. From the above explanation, in order to reduce the vibration transmissibility, the holes in the plate springs 19a and 19b,
Make the constant small enough.

In the above configuration, the vibration of the secondary scale 16 generated by the operation of the linear pulse motor is caused by the plate spring 19.
a and 19b, the signal is sufficiently attenuated for the reason stated in the above configuration and is transmitted to the device main body 17.

As described above, according to the present invention, the secondary side scale of the linear loop (loose smoke) and the main body of the equipment to which the linear loop loop is connected are connected via a leaf spring having a sufficiently small spring constant. The vibration of the secondary scale is not directly transmitted to the equipment body, and is transmitted to the equipment body through the leaf spring with a sufficiently small spring constant, so the vibration transmission rate is sufficiently small, and as a result, the secondary scale The generated vibrations can be attenuated on the device body side, and the vibrations and noise emitted from the device body are reduced.
＋ can be reduced.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway front view of a conventional linear pulse motor, Figure 2 is a partially cutaway side view of a conventional linear loop smoker, and Figure 3 is a secondary side Y of the linear loop loop.
Figure 4 is a schematic diagram of the connecting part according to the present invention between the main body of the equipment that can be used with the linear pulse controller 1 & 1, and the frequency ratio ω7/(relationship between IJO and vibration transmissibility Y) 6 . . .
・・・−Secondary side scale] 7 ・ ・・・−・・・・
・Device body 1/9a, ], 9b...
Applicant Shinko Electric Co., Ltd. Patent attorney Haruya Saito 3rd figure 4m%. - Procedural amendment (voluntary) 1. Indication of the case Patent Application No. 10179 of 1988 2. Name of the invention Linear pulse motor □□□ Sound prevention device 3, person making the amendment Relationship to the case Patent applicant 4 , Agent 5j3. Number of inventions increased by amendment O] 4 pages 1
Correct "Skel" in the fourth line to "Scale". “When ω” written on page 24, line 20 is changed to “when ω”.
Correct. 35 Tei 3rd line % formula %

Claims (1)

[Claims] A noise prevention mechanism for a linear pulse motor, in which a secondary side school of the linear pulse motor and a device body to which the linear pulse motor is attached are fixed via an elastic body with a sufficiently small spring constant.