CN102882314B - The cooling structure of ultraprecise linear electric motors - Google Patents

Abstract

The cooling structure of ultraprecise linear electric motors, belongs to techniques of linear motor field.It solve the side temperature rise of the bilateral surface-mount type cooling structure of existing linear electric motors, easy and environment produces the problem of heat exchange.It comprises winding support portion and winding, winding is fixed on winding abutment surfaces, it also comprises heat-conducting part, the outer surface that this heat-conducting part is arranged on winding is fixedly connected with winding support portion, described heat-conducting part is Copper Foil circle, the lateral profile of this Copper Foil circle and winding adapts, and is fixed by socket on the outer surface of winding; Or heat-conducting part is disperse by multiple Copper Foil segmentation the Copper Foil heat conduction circle formed of arranging, and the lateral profile of this Copper Foil heat conduction circle and winding adapts, and each Copper Foil segmentation is all fixed on the outer surface of winding.The present invention is applicable to the cooling of linear electric motors.

Description

Cooling structure of ultra-precision linear motor

technical field

The invention relates to a cooling structure of an ultra-precision linear motor, belonging to the technical field of linear motors.

Background technique

The ultra-precision linear motor is the actuator that guarantees the operation of the ultra-precision servo system. With the development of nanotechnology and biotechnology, the requirements for thrust density and thrust accuracy of ultra-precision linear motors are gradually increasing, which leads to an increase in the current density of the motor windings, and the copper loss increases accordingly. Since the current ultra-precision position servo system uses a laser displacement sensor, it has high requirements on the constant temperature of the ambient temperature, and the ultra-precision servo system has a high integration density. During operation, the ultra-precision linear motor used is difficult. Avoid heat dissipation to the outside world, and the ultra-precise position servo system using laser displacement sensors requires that the heat exchange between each component of the system and the environment tends to be zero. Most of the current linear motors are difficult to meet this requirement.

Currently proposed water cooling structures for ultra-precision linear motors:

In order to reduce the thrust fluctuation, the linear motor adopts a coreless structure to eliminate the cogging force and magnetic resistance of the conventional motor. However, if the thrust density is the same, the current density of the motor winding must be higher than that of a linear motor with an iron core. Motor, copper consumption is bound to increase. In order to ensure the reliable operation of the motor and reduce the heat dissipation of the motor to the outside world, a double-sided surface-mounted cooling structure is proposed, as shown in Figure 9. The windings are fixed by a supporting structure A, and then water cooling plates B are installed on the upper and lower surfaces of the cooling structure. The winding realizes cooling, C in the figure represents the water inlet of water cooling, and D represents the water outlet of water cooling.

Experimental testing of this bilateral surface-mounted cooling structure shows that the temperature rise is higher on the sides of the motor. The upper and lower water-cooling plates B used in it can only significantly suppress the temperature rise of the upper and lower surfaces of the motor primary, and the higher temperature rise on the side will generate heat exchange with the environment.

Contents of the invention

The purpose of the present invention is to solve the problem that the side temperature of the bilateral surface-mounted cooling structure of the existing linear motor rises and the problem of easy heat exchange with the environment is provided, and a cooling structure for an ultra-precision linear motor is provided.

The cooling structure of the ultra-precision linear motor of the present invention includes a winding support part and a winding, the winding is fixed on the surface of the winding support part, and it also includes a heat conduction part, which is arranged on the outer surface of the winding and fixed with the winding support part connect.

The heat conducting part is a copper foil ring, which adapts to the outer contour of the winding and is sleeved and fixed on the outer surface of the winding.

The heat conduction part is a copper foil heat conduction ring composed of a plurality of copper foil segments scattered and arranged, the copper foil heat conduction ring adapts to the outer contour of the winding, and each copper foil segment is fixed on the outer surface of the winding.

There are multiple copper foil reserved slots on the winding support part, and each copper foil reserved slot is used to fix a copper foil segment.

The plurality of copper foil segments forming the copper foil thermal conduction ring are arranged at equal intervals.

The copper foil segment can also be a C-shaped copper foil segment, and the outer surface of the side wall opposite to the opening side of the C-shaped copper foil segment is fixed to the outer surface of the winding.

The heat conduction part, the winding support part and the winding are bonded and fixed with each other by structural glue.

The advantage of the present invention is: without changing the existing structure of the motor, the present invention increases the heat conduction path from the winding heat source to the cooling structure by increasing the form of copper foil, so that the cooling plate can effectively cool the heat source. The temperature rise of the winding increases the current density in the motor winding, which further improves the thrust of the motor. At the same time, the copper foil blocks the path of the heat source releasing heat to the outside through the side of the motor, inhibiting the heat exchange between the motor and the outside. Therefore, adopting this structure in the linear motor can increase the thrust density of the ultra-precision linear motor without changing the ambient temperature of the motor, which provides the necessary conditions for the precise position detection of the motor.

On the premise of not changing the volume of the motor, the invention directs as much heat from the side of the winding to the cooling plate as possible by adding heat conduction branches, thereby realizing the function of heat shielding the side surface of the winding.

Description of drawings

FIG. 1 is a schematic structural diagram of Embodiment 2 of the present invention;

Fig. 2 is a schematic diagram of the fixed relationship between the copper foil circle and the winding in the second embodiment;

Fig. 3 is a schematic structural diagram of Embodiment 3 of the present invention;

Fig. 4 is a schematic diagram of the fixed relationship between the copper foil heat conducting ring and the winding in the third embodiment;

Fig. 5 is a schematic structural diagram of Embodiment 6 of the present invention;

Fig. 6 is a schematic diagram of the fixed relationship between the copper foil heat conducting ring and the winding in Embodiment 6;

Fig. 7 is a thermal network distribution diagram of a section of an ordinary DC linear motor;

Fig. 8 is the thermal network distribution diagram of the DC linear motor section adopting the cooling structure of the present invention;

FIG. 9 is a schematic diagram of a bilateral surface mount cooling structure of a conventional linear motor.

Detailed ways

Specific Embodiment 1: The present embodiment will be described below in conjunction with FIGS. 1 to 6. The cooling structure of the ultra-precision linear motor described in this embodiment includes a winding support part 1 and a winding 2. The winding 2 is fixed on the surface of the winding support part 1. It also includes a heat conduction part, which is arranged on the outer surface of the winding 2 and fixedly connected with the winding support part 1 .

Specific embodiment two: The present embodiment will be described below in conjunction with FIG. 1 and FIG. 2. This embodiment is a further description of the first embodiment. Compatible, and socket fixed on the outer surface of the winding 2.

In this embodiment, a layer of copper foil ring 31 is added on the side of the winding 2, and the copper foil ring 31 can be glued and fixed with the winding 2 and the winding support part 1 respectively, and the copper foil ring 31 and the winding The bonding glue between 2 should give priority to high thermal conductivity structural glue. In addition, when assembling, the upper and lower surfaces of the copper foil ring 31 should be in full contact with the upper water cooling plate and the lower water cooling plate, and high thermal conductivity glue can be used to fill them to ensure that the surface of the copper foil ring 31 is in contact with the water cooling plate. efficient heat exchange.

The bonding glue between the winding 2 and the copper foil ring 31 should be of insulating type, so as to ensure the external insulation of the motor winding and improve the reliability of the motor.

Specific Embodiment Three: The present embodiment will be described below in conjunction with Fig. 3 and Fig. 4. This embodiment is a further description of Embodiment 1. The heat conduction part is a copper foil heat conduction ring composed of a plurality of copper foils distributed in sections 32 , the copper foil heat conducting ring 32 is adapted to the outer contour of the winding 2 , and each copper foil segment is fixed on the outer surface of the winding 2 .

Embodiment 4: This embodiment is a further description of Embodiment 3. There are multiple copper foil reserved grooves on the winding support part 1, and each copper foil reserved groove is used to fix a copper foil segment.

In this embodiment, the copper foil heat conduction ring 32 is divided into several sections, and the copper foil reserved groove is firstly processed on the contact surface between the winding support part 1 and the winding 2, and the copper foil heat conduction ring 32 is also made of high thermal conductivity structural glue. Bonded together with the winding 2 and the winding support part 1,

This embodiment not only solves the problem of temperature rise on the side of the motor, but also solves the problem of the eddy current damping force of the motor.

Embodiment 5: This embodiment is a further description of Embodiment 3 or 4. The plurality of copper foils forming the copper foil heat conducting ring 32 are arranged in equal intervals.

Specific Embodiment Six: The present embodiment will be described below in conjunction with Figs. 5 to 6. This embodiment is a further description of Embodiment 3. The copper foil segment is a C-shaped copper foil segment, and the C-shaped copper foil segment The outer surface of the side wall opposite to the opening side is fixed to the outer surface of the winding 2.

In this embodiment, the copper foil is processed into a C-like structure in sections, which effectively improves the primary mechanical structure strength of the motor while ensuring the contact area between the upper water cooling plate and the lower water cooling plate and the copper foil heat conducting ring 32 .

Specific Embodiment 7: The present embodiment will be described below in conjunction with FIG. 7 and FIG. 8. This embodiment is a further description of Embodiment 1, 2, 3, 4, 5 or 6. The heat conducting part, the winding support part 1 and the winding 2 are fixed with structural glue.

The bonding glue between the winding 2 and the heat conduction part should be of insulating type, so as to ensure the external insulation of the motor winding and improve the reliability of the motor.

working principle:

According to the results of finite element numerical calculation of the linear motor temperature field, it can be seen that the thinner the support structure between the motor winding and the outside air, the higher the temperature rise of the motor surface.

To adopt the linear motor of the cooling structure of the present invention to build the temperature field model of the motor, the heat source in the model is a winding, and its heat flow has 3 circulation paths:

①The heat flow Q ₁ is generated by the winding and flows upward through the adhesive layer, and finally reaches the cooling plate;

②The heat flow Q ₂ is generated by the winding and flows to the right through the adhesive layer, polyether ether ketone PEEK, and then upward through the adhesive layer and finally to the cooling plate;

③Heat flow Q ₃ is generated by the winding and flows through the adhesive layer and PEEK to the left, and is divided into two paths. One path flows to the left surface of PEEK for natural convection heat dissipation, and the other path flows upward through the adhesive layer, and finally reaches the cooling plate.

According to the above analysis, calculate the thermal resistance of each part:

1. Heat flow branch ① Calculate the thermal resistance of each part.

Winding upward thermal resistance R _ct :

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; ct</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}}{{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, k _c is the thermal conductivity of the winding; A _c is the upper surface area of the winding, and d _c is the thickness of 1/2 of the winding. The heat transfer resistance R _cgt of the adhesive layer on the winding:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cgt</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Among them, k _c is the thermal conductivity of the winding; A _c is the upper surface area of the winding; d _g is the thickness of the adhesive layer.

Thermal resistance R _cw of the cooling plate above the winding:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cw</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Among them, h _w is the heat dissipation coefficient of the cooling plate.

2. Calculation of the thermal resistance of each part of the heat flow branch ②.

Winding right heat transfer thermal resistance R _cr :

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cr</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

Among them, A _f is PEEK, winding side area, l _c is winding width.

The heat transfer resistance R _cgr of the adhesive layer on the right side of the winding to the right:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cgr</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

Among them, d _g is the thickness of the adhesive film between the cooling plate and the winding, and k _g is the thermal conductivity of the adhesive. PEEK upward heat transfer thermal resistance R _pr on the right side of the winding:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pr</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}}{{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$

Among them, A _p2 is the upper surface area of the PEEK material on the right side of the winding, k _p is the thermal conductivity of PEEK, and l _p2 is the 1/2 length of the winding core.

The heat transfer resistance R _pgrt of the adhesive layer on the upper surface of PEEK on the right side of the winding:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pgrt</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; )</span>$

The thermal resistance R _cwr of the water cooling plate on the right side of the winding:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cwr</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 8</span>}<span\; class="notranslate">\; )</span>$

Among them, _hw is the heat dissipation coefficient of cooling plate B.

3. Calculation of heat flow branch ③ thermal resistance of each part.

Winding left heat transfer thermal resistance R _cl :

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cl</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cr</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 9</span>}<span\; class="notranslate">\; )</span>$

The heat transfer resistance R _cgl of the adhesive layer on the left side of the winding to the left:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cgl</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cgr</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 10</span>}<span\; class="notranslate">\; )</span>$

PEEK upward heat transfer thermal resistance R _plt on the left side of the winding:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; plt</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}}{{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 11</span>}<span\; class="notranslate">\; )</span>$

Among them, A _p1 is the surface area of the PEEK plate on the left side of the winding, and l _p1 is the width of the winding support structure.

Thermal resistance of the adhesive layer on the upper surface of the PEEK on the left side of the winding:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pglt</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 12</span>}<span\; class="notranslate">\; )</span>$

Thermal resistance of the water-cooled plate on the left side of the winding:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cwl</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 13</span>}<span\; class="notranslate">\; )</span>$

The thermal resistance of PEEK on the left side of the winding to the left:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pll</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 14</span>}<span\; class="notranslate">\; )</span>$

PEEK left air natural convection heat dissipation thermal resistance:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pn</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 15</span>}<span\; class="notranslate">\; )</span>$

Among them, h _n is the natural heat dissipation coefficient of air.

Through the above analysis, the thermal network distribution of the DC linear motor section as shown in Figure 7 is obtained. In the figure, q _cu is the copper loss in the calculation area of the winding.

According to the thermal network distribution in Figure 7, the respective thermal resistances R ₁ , R ₂ and R ₃ of the above three heat flow paths are obtained:

R ₁ =R _ct +R _cgt +R _cw (15)

R ₂ =R _cr +R _cgr +R _pr +R _pgrt +R _cwr (16)

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cl</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cgl</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; plt</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; glt</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cwl</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pll</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pn</span>}}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 17</span>}<span\; class="notranslate">\; )</span>$

On the premise that the heat source and heat network distribution are known, the heat flow Q ₁ , Q ₂ and Q ₃ of each heat path can be calculated.

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; cu</span>}}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}\\ {\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; cu</span>}}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}{<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}\\ {\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; cu</span>}}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}\end{array}\right.<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 18</span>}<span\; class="notranslate">\; )</span>$

On the basis of formula 18, Q ₃₁ and Q ₃₂ are obtained by further calculation:

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 31</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}\frac{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; plt</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; glt</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cwl</span>}}}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; plt</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; glt</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cwl</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pll</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pn</span>}}}}\\ {\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 32</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}\frac{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pll</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pn</span>}}}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; plt</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; glt</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cwl</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pll</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pn</span>}}}}\end{array}\right.<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 19</span>}<span\; class="notranslate">\; )</span>$

Assuming the external ambient temperature T ₀ , the temperature at point A of the thermal network in Figure 7 can be obtained by formula 19, that is, the surface temperature T _op of the PEEK material:

T _op =T ₀ +Q ₃₂ R _pn (20)

Make small volume adjustments to the heat flow branch ③, on the premise that it does not affect the electromagnetic characteristics of the motor, introduce a new heat flow branch, and use high thermal conductivity metal materials, such as copper and aluminum. The thermal conductivity k _cu of metal copper is 400K/mk. Add a copper foil layer with a thickness of 1 _cu on the left side of the adhesive layer of the branch ③ to conduct the heat flow of this path to the cooling plate and reduce the inflow of heat flow of the left PEEK plate, thereby suppressing its surface temperature rises.

Add a parallel branch to the heat flow branch ③:

Copper foil upward heat transfer thermal resistance:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cut</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; cu</span>}}<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}}{{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; cu</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; cu</span>}}}{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; twenty\; one</span>}<span\; class="notranslate">\; )</span>$

Among them, A _cu is the upper surface area of the copper foil, and l _cu is the width of the copper foil layer.

Thermal resistance of the adhesive layer on the upper surface of the copper foil:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cug</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; cu</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; twenty\; two</span>}<span\; class="notranslate">\; )</span>$

Thermal resistance of water cooling plate above copper foil:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cuw</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; cu</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; twenty\; three</span>}<span\; class="notranslate">\; )</span>$

Copper foil heat transfer resistance to the left:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cul</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; cu</span>}}}{{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; cu</span>}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; twenty\; four</span>}<span\; class="notranslate">\; )</span>$

At this time, the thermal network distribution is shown in Figure 8, and the thermal resistance R ₃ of the branch ③ becomes: After adding copper foil, the thermal network distribution is:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cl</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cgl</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 31</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 32</span>}}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 25</span>}<span\; class="notranslate">\; )</span>$

Wherein, R ₃₁ =R _cut +R _cug +R _cuw , $R_{32}=R_{\mathrm{cul}}+\frac{1}{\frac{1}{R_{\mathrm{plt}}+R_{\mathrm{glt}}+R_{\mathrm{cwl}}}+\frac{1}{R_{\mathrm{pll}}+R_{\mathrm{pn}}}}.$

Q ₁ , Q ₂ and Q ₃ are still calculated using formula 18, and the heat flow calculation of each heat circuit in branch ③ is shown in the following formula:

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 33</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 31</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 31</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 32</span>}}}\\ {\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 31</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 33</span>}}<span\; class="notranslate">\; )</span>\frac{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; plt</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; glt</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cwl</span>}}}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; plt</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; glt</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cwl</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pll</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pn</span>}}}}\\ {\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 32</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 33</span>}}<span\; class="notranslate">\; )</span>\frac{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pll</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pn</span>}}}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; plt</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; glt</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; cwl</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pll</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; pn</span>}}}}\end{array}\right.<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 26</span>}<span\; class="notranslate">\; )</span>$

The temperature at point A is calculated according to formula 20. It is verified by the calculation results that the surface temperature rise of the motor side of the original cooling structure can be reduced from 10°C, or even dozens of degrees Celsius, to a few degrees Celsius or less than 1°C, effectively suppressing the motor surface temperature rise.

Claims (5)

1. A cooling structure for an ultra-precision linear motor, which includes a winding support (1) and a winding (2), the winding (2) is fixed on the surface of the winding support (1), and it also includes a heat conduction portion, the heat conduction portion is set On the outer surface of the winding (2) and fixedly connected with the winding support part (1), it is characterized in that: The heat conduction part is a copper foil heat conduction ring (32) composed of a plurality of copper foil segments scattered and arranged. The copper foil heat conduction ring (32) is adapted to the outer contour of the winding (2), and each copper foil segment All are fixed on the outer surface of the winding (2), and the upper and lower surfaces of the winding (2) are provided with water cooling plates, and the upper and lower surfaces of the copper foil heat conducting ring (32) are in full contact with the upper water cooling plate and the lower water cooling plate respectively. 2. The cooling structure of the ultra-precision linear motor according to claim 1, characterized in that: the winding support part (1) has a plurality of copper foil reserved slots, and each copper foil reserved slot is used to fix a copper foil Segmentation. 3. The cooling structure of the ultra-precision linear motor according to claim 1 or 2, characterized in that: the plurality of copper foils forming the copper foil heat conducting ring (32) are arranged at equal intervals in sections. 4. The cooling structure of an ultra-precision linear motor according to claim 1, wherein the copper foil segment is a C-shaped copper foil segment, and the side wall of the C-shaped copper foil segment opposite to the opening side The outer surface is fixed to the outer surface of the winding (2). 5. The cooling structure of the ultra-precision linear motor according to claim 1, 2 or 4, characterized in that: the heat conduction part, the winding support part (1) and the winding (2) are bonded and fixed to each other by structural glue .