JPH01174260A - Linear pulse motor - Google Patents

Abstract

PURPOSE:To obtain a compact and lightweight pulse motor at a low cost by constructing the motor with mainly a primary side electromagnetic force generating section 1 constituted of primary side magnetic poles, windings and a permanent magnet, a secondary side magnetic pole and sliding devices. CONSTITUTION:A cylindrical linear pulse motor is mainly constituted of a primary side electromagnetic force generation section 1 constituted of primary side magnetic poles 3a-3b, windings 2a-2b and a permanent magnet, a secondary side magnetic pole 20 and sliding devices 30a-30b. The secondary side magnetic pole 20 is so disposed on the periphery of the primary side electromagnetic force generation section 1 that each of them forms a coaxial cylinder through sliding devices 30a-30b and movable shafts 35a-35b. Primary side magnetic poles 3a-3b and movable shafts 35a-35b are constituted of a heat pipe 50. The heat pipe 50 provides specified windings 2a-2b on the primary side magnetic poles 3a-3b, and the primary side electromagnetic force generation section 1 is constituted by placing the permanent magnet 4 between the primary side magnetic poles 3a and 3b. Accordingly, an atmosphere and a space of the installation location are not restricted.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is directed to dissipating heat due to copper loss, iron loss, etc. generated from the primary side magnetomotive force generating part and the secondary side magnetic pole through a heat pipe. This article relates to a linear pulse motor with special features.

[Field of application of the invention]

A linear pulse motor is a motor that responds to electrical pulse input.
It is a linear actuator that enables stepwise linear motion with a step amount corresponding to the number of pulses.A heat pipe is composed of an evaporation section (heat absorption section), a condensation section (heat release section), and a capillary structure section (heat conduction section). ) A capillary structure and a working fluid are sealed inside a container, and it is a heat transfer element that makes it possible to freely control the temperature of a heat radiating object or a cooling object.

The linear pulse motor of the present invention can perform speed control, positioning control, etc. with high precision using electric signals as with conventional linear pulse motors, and also reduces ventilation in the installation location and heat generation in the linear pulse motor main body. It is possible to install the linear pulse motor in a sealed place, a closed place, or a place that dislikes heat without considering the adverse effects on other devices or parts in the vicinity, and various characteristics due to temperature rise of the linear pulse motor body This suppresses the decrease in the speed of moving parts such as computer terminal equipment such as printers and floppy devices, machine tools, electrical processing equipment, and various fluid control valves that require minute displacement control and frequent speed control that require high precision. It is used as a driving source.

[Technical background of the invention]

In general, linear actuators and electric rotating machines including linear pulse motors generate heat due to copper loss in windings, iron loss in magnetic poles, etc. during operation. Copper loss is the Joule heat of the winding, iron loss Wi is composed of the hysteresis loss of the magnetic material forming the magnetic pole and eddy current base as shown in the first equation, and the hysteresis loss is as shown in the second equation. The eddy current loss We is proportional to the frequency f and the square of the magnetic flux density B, as shown in Equation 6, and the eddy current loss We is proportional to the frequency f and the square of the magnetic flux density B, as shown in Equation 6.

W i =W h +W e (1
)Wh=Kh-f-B (2)We-K
e・(d−f−B)2 (3) Wi: Iron loss
[W/kg)Wh: Hysteresis loss (W
/proboscis] We: Eddy current loss [W/kLi] f: Frequency [H2] B: Magnetic flux density [T] d: Thickness of magnetic material [Kan] Kh: Constant depending on the material and thickness of magnetic material Ke: Magnetism Constants Depends on the Material and Thickness Normally, linear pulse motors have extremely large core losses because they operate at higher frequencies and higher magnetic flux densities than other linear actuators and general electric rotating machines.

In general, linear actuators and electric rotating machines need to be kept dry at all times to prevent moisture from entering from the outside due to the heat generated by copper loss and iron loss. This accelerates the deterioration of the product and causes burnout accidents. Similarly, a linear pulse motor requires a moderate temperature rise, but as mentioned above, the core loss is extremely large, so the amount of heat generated is large, and the number of turns of the winding is increased because it requires high magnetic flux density operation. Inevitably, as the outer diameter of the winding becomes thinner, the winding becomes longer, copper loss increases, and the amount of heat generated becomes larger.

Note that, depending on the driving method such as constant current driving at high speed, a significant increase in heat generation appears.

In particular, in a linear pulse motor in which the secondary magnetic poles (A) are arranged in a coaxial cylindrical shape around the primary magnetomotive force generating part (1) as shown in Fig. 4, the winding (2a)
, (2b) and the iron loss of the primary magnetic poles (3a) and (6b) make it difficult to release heat.

Generally, the thrust of a linear pulse motor decreases as the winding temperature increases, and the decrease in thrust becomes more noticeable during low-speed operation.

As mentioned above, linear pulse motors must necessarily be operated at high temperatures, leading to higher quality electrical insulating materials and larger and heavier equipment.

FIG. 1 shows a conventional linear pulse motor. Winding wire (2a
), (2b), primary side magnetomotive force generating section (1) composed of primary side magnetic poles (3a), (3b) and permanent magnet (4)
, secondary magnetic pole (a), sliding device (30a), (30b)
, the side plates (25aX25b) are each formed into a coaxial cylindrical shape, and a predetermined number of protrusions are formed on the cylindrical surfaces of the primary magnetic poles (6a) (3b) and the secondary magnetic poles (20) facing each other with a certain gap G between them. magnetic pole teeth (5a), (5b), (6a),
(6b)%(21) are arranged in a row. The primary side magnetomotive force generating part (1) and the secondary side magnetic pole (a) are the sliding device (30a) (3
0b), it has a structure that maintains a constant gap G and allows relative rectilinear movement in the axial direction.

As shown in Fig. 2, the primary magnetic pole (:co) (6
a), (5b) constitute magnetic pole teeth (5a), (5b),
(6a) and (6b) are based on the magnetic pole tooth (5a), and the magnetic pole tooth (5b) is /2).
) are respectively arranged in a state shifted by 9L in the opposite direction.

That is, the magnetic pole teeth (5
a), (5b) and the magnetic pole teeth (6a), (6b) are in a state where there is no deviation from the magnetic pole tooth Cυ and a state where it is deviated by t72,
or 7-/4 degrees offset in opposite directions. The winding (2) is connected to the magnetic flux axis of the permanent magnet (4) shown by the dotted line.
When a current is passed in a predetermined direction through b), a magnetic flux Φi shown by a solid line is generated. Magnetic flux Φ between magnetic pole tooth (21) and magnetic pole tooth (6b)
m and the magnetic flux Φi cancel each other out, and the primary magnetic pole (5b) or the primary magnetomotive force generator (1) is moved in the direction of arrow A or the secondary magnetic pole (i.e. ) is generated 74 times in the direction of arrow B. When the movement is completed, the magnetic pole teeth (5a), (5b
) is shifted by ``''/4, and by passing current through the winding (2a), the primary side magnetomotive force generating section (1) or the secondary side magnetic pole (A) is moved in a predetermined direction.

Although the one-phase excitation method of a two-phase linear pulse motor has been described above, a multi-phase linear pulse motor can also be configured in the same way.Other excitation methods such as a two-phase excitation method or a 1-2 phase excitation method The principle is the same in both cases.

As is well known, a heat pipe is a heat transfer element with excellent thermal conductivity, and depending on the type of working fluid, the heat pipe can be heated up to 250 degrees below absolute zero.
It is possible to transmit temperature over a wide range of about 0 [°C]. To explain its operation with reference to FIG. 6, a heat pipe is a container Gυ with a capillary structure and a small amount of working fluid 6j placed inside, evacuated, and then sealed. Part (54) )
When heated, the working fluid (53) in the container 6υ evaporates, and the generated steam 651 is transferred to the other end (condensing section 56) which has cooled down.
The working fluid (53) moves in the direction of arrow C, condenses and returns to liquid, and further moves to the evaporation section 54 within the capillary structure (5) by capillary action. That is, it is a heat transfer element using the working fluid 153) as a medium.

[Purpose of the invention]

The present invention is capable of reducing the thrust force due to increases in temperature of windings and magnetic poles due to copper loss and iron loss, increasing the quality of various electrical insulating materials, changing the distance between each magnetic pole, and reducing the sliding device by operating a linear pulse motor. By preventing instability, etc., it is possible to reduce the size and weight of the device, reduce costs, and stabilize the thrust characteristics, making it possible to install it in narrow spaces or closed places regardless of the ventilation or atmosphere of the installation location. The purpose of this invention is to provide a linear pulse motor that can

[Summary of the invention]

The present invention is intended to achieve the above object, and is directed to a primary magnetomotive force generating section comprising a primary magnetic pole, a winding, and a permanent magnet, a secondary magnetic pole, and a sliding device. This linear pulse motor is characterized by dissipating heat generated by copper loss and iron loss in the magnetic force generating section, iron loss in the secondary magnetic pole, etc. through a heat pipe.

[Embodiments of the invention]

The linear pulse motor according to the present invention will be explained in the embodiment shown in FIGS. 4 to 6.

Figure 4 shows the primary magnetic poles (3a), (6b) and the winding (2a).
), (2b) and a primary side magnetomotive force generating part (1) consisting of a permanent magnet (4), a secondary side magnetic pole (a) and a sliding device (30a
), (30b), a sliding device (
30a), (30b) and movable shafts (35a), (35b)
They were arranged so that they each formed a coaxial cylindrical shape. Primary side magnetic poles (3a), (3b) and OI moving shaft (35a), (
35b) and a heat pipe 50) are shown. Primary magnetic pole (6a
), (5b) are the evaporation parts (54a) and (5) marked with heat pipes.
4b) is formed integrally with the container 61). The container 6υ is made of metal with a large magnetic permeability μ, a small coercive force He, and a large electric resistance, and has a primary magnetic pole (3a
), (3b) and the capillary structure (52) and the space for accommodating the working fluid part are processed and then annealed at a predetermined temperature for the purpose of improving the magnetic properties of the metal.The heat pipe is formed by The capillary structure 52 and the working fluid 531 are placed inside the container 6υ, and after the vacuum is drawn, both ends are sealed, and the sliding parts with the sliding devices (30a) and (30b) are coated with chrome plating, porous chrome plating, or low-temperature sputtering. A wear-resistant metal coating is formed on the primary magnetic pole (3
By providing predetermined windings (2a) and (2b) in a) and (3b) and arranging a permanent magnet (4) between the primary magnetic pole (6a) and the primary magnetic pole (3b), the primary magnetomotive force can be increased. Generating part (1
) (t: i configure.

FIG. 5 shows a capillary structure (52a), (52b) and a working fluid (52b) each having the purpose of dissipating or cooling the primary magnetic pole (6a) or primary magnetic pole (6b) separately.
Container 61 where 3a) and (53b) are stored
evaporation part (54a) of a heat pipe (54a), (5
4b), the primary side magnetic poles (3a), (3b), and the permanent magnet (4b).
) and windings (2a) and (2b) are inserted or arranged and fixed to the primary side magnetomotive force generating part (1). The primary magnetic poles (3a) and (3b) are each integrally formed of a metal having the above-mentioned magnetic and electrical characteristics, or are formed by laminating silicon steel plates, magnetic pole steel plates, or the like.

FIG. 6 shows a secondary magnetic pole (a) of the cylindrical linear pulse motor shown in FIG. 1 made of a human pipe.

The linear pulse motors shown in FIGS. 4 to 6 are examples of those having a cylindrical shape, and can also be used for linear pulse motors having a flat plate shape. It can take many forms depending on the shape of the motor, the shape of the heat pipe, the shape that increases the surface area of the condensing part of the heat pipe, etc.

〔Effect of the invention〕

The linear pulse motor of the present invention radiates heat generated by copper loss and iron loss in the primary side magnetomotive force generating section and iron loss in the secondary side magnetic pole through a heat pipe, as described below. It has a great effect.

(1) ') Joule heat generated by passing a predetermined pulse current through the windings constituting the primary side magnetomotive force generating part of a near-pulse motor can be quickly dissipated or the windings can be cooled. , it is possible to generate a larger thrust.

(2) Temperature fluctuations can be easily suppressed, thereby preventing thrust fluctuations.

(3) It becomes possible to prevent a reduction in thrust due to temperature rise, and accordingly it becomes possible to reduce the size and weight of the linear pulse motor and the cost of the constituent materials.

(4) It is possible to lower the insulation level of various insulators constituting the linear pulse motor with respect to temperature, and the cost of insulating materials is reduced.

(5) There will be no thermal damage (deterioration of insulation due to heat, generation of thermal noise due to heating of electronic components, etc.) to other devices installed nearby (particularly devices with electronic circuits).

(6) General KIJ Near Pulse Smoke is used as a drive source for the moving parts of various devices, and due to installation space constraints, it is desired to be small and lightweight, and it is also desirable to install it in a closed place without ventilation. It is something that can be done. The linear pulse motor of the present invention has a heat pipe condensing section 56).
By installing or cooling only the heat radiating section or the cooling section in an open place, the linear pulse motor main body can be radiated or cooled, and is not subject to restrictions such as the atmosphere of the installation location and the installation space.

[Brief explanation of the drawing]

FIG. 1 is a perspective sectional view of a conventional linear pulse motor. FIG. 2 is an explanatory diagram of the operating principle of the linear pulse motor shown in FIG. 1. FIG. 5 is an explanatory diagram of the operation of the heat pipe. 4 to 6 are structural explanatory diagrams according to embodiments of the linear pulse motor of the present invention.

Claims (7)

[Claims] (1) Mainly composed of a primary magnetic pole, a primary magnetomotive force generating section consisting of a winding and a permanent magnet, a secondary magnetic pole, and a sliding device, with a fixed gap between the primary magnetic pole and the secondary magnetic pole. A predetermined number of convex magnetic pole teeth are arranged in rows on each facing part,
It is characterized by dissipating heat generated by copper loss in the primary side magnetomotive force generation part and iron loss between the primary side magnetic pole and the secondary side magnetic pole, etc., through a heat pipe when relative linear motion is performed in a predetermined axial direction. linear pulse motor. (2) A linear pulse motor according to claim 1, wherein the primary magnetic pole or the secondary magnetic pole is formed of a heat pipe. (3) A linear pulse motor according to claim 1, wherein a part of the primary magnetic pole or the secondary magnetic pole is formed by a heat pipe. (4) A linear pulse motor according to claim 1, wherein the primary magnetic pole or the secondary magnetic pole is formed by laminating a plate-shaped heat pipe and various magnetic materials. (5) A linear pulse motor according to claim 1, characterized in that the linear pulse motor has a structure in which a heat pipe is closely inserted into a predetermined position of the primary magnetic pole or the secondary magnetic pole. (6) A linear pulse motor according to claim 1, characterized in that the linear pulse motor has a structure in which a heat pipe is closely fixed to a predetermined surface constituting a primary magnetic pole or a secondary magnetic pole. (7) In the linear pulse motor set forth in claim 1, the heat pipe installation structure, etc. set forth in claim 2, 3, 4, 5, or 6 is provided. A linear pulse motor characterized by a combination of each.