CN220775577U - Electric tool and motor device thereof - Google Patents

Abstract

The present utility model provides a motor apparatus for driving an electric tool, comprising: a rotor assembly; and a stator assembly including one or more coils; and a temperature detection assembly. The temperature detection assembly includes: one or more temperature sensors disposed adjacent to the at least one coil for detecting a temperature thereof; one or more first electrical connection elements that electrically connect the temperature sensor to a control circuit board of the power tool that is disposed separately from the motor device, transmitting temperature information to the control circuit board; and one or more heat conducting elements located between the temperature sensor and the coil to be detected for conducting the temperature of the coil to the temperature sensor. The motor arrangement further comprises a fixing structure for at least partially fixing the position of the temperature detection assembly. An electric tool having the motor device is also provided. The motor device has the advantages of simple and compact structure, high safety, easy replacement and high detection accuracy.

Description

Electric tool and motor device thereof

Technical Field

The present utility model relates to the field of electric tools, and more particularly, to an electric tool and a motor device thereof.

Background

Power tools, particularly small power tools for home use, which are currently in the market, typically have a motor arrangement to drive an attached tool head for various operations. For these power tools, the motor arrangement is of vital importance.

During operation of the motor device, the stator coil is a main component generating heat, and the current flowing through the stator coil generates more heat at the coil to cause the temperature of the coil to rise.

In the prior art, temperature sensors typically acquire nearby coil temperature by direct contact heat transfer or by air heat transfer in a gap therebetween. However, most of the shapes of the temperature sensor and the stator coil are not adapted, the contact area (contact heat transfer area) between the two adjacent coils is small and uneven, and the air heat conduction coefficient is low, so that the traditional temperature sensor arrangement generally causes inaccurate detection, and more accurate coil temperature information cannot be obtained.

In addition, the related art generally integrates a motor control circuit board for controlling/adjusting motor parameters (such as torque, rotation speed, commutation, etc.) in a motor device, for example, is fixedly connected to and supported by the motor device, and various electronic components such as a temperature sensor are integrally mounted on the control circuit board. However, this arrangement makes the structure of the motor device complex, occupies a large space, and is disadvantageous for miniaturization; moreover, when the temperature of the motor device is too high, a control circuit board positioned in or connected with the motor device can be damaged, so that potential safety hazards exist; in addition, when the motor apparatus is damaged and needs to be replaced, it is often necessary to replace the motor apparatus together with the motor control circuit board, resulting in an increase in cost.

Accordingly, there is a need to provide an electric tool and a motor arrangement thereof that solves or at least alleviates the above-mentioned problems.

Disclosure of Invention

The present utility model provides an electric tool and a motor device thereof, which can simplify and compact the motor device structure, make the motor device be easy to independently maintain or replace, and allow a control device for regulating motor parameters to be not easily influenced by the motor device (particularly, temperature) in operation. Meanwhile, the temperature detection assembly in the motor device of the utility model is reliably fixed, and the temperature of the coil in the motor device can be accurately detected, so that the electric tool can accurately monitor the temperature of the motor device.

According to one aspect of the present utility model, there is provided a motor apparatus which can be used to drive a power tool to operate, the motor apparatus comprising:

a rotor assembly; and

a stator assembly including a coil unit having one or more coils;

the motor apparatus further includes a temperature detection assembly including:

one or more temperature sensors disposed in proximity to at least one of the one or more coils for detecting a temperature of the at least one coil;

one or more first electrical connection elements arranged in correspondence with the one or more temperature sensors, wherein the respective first electrical connection elements electrically connect the temperature sensors to a control circuit board of the power tool arranged separately from the motor means, transmitting temperature information detected by the temperature sensors to the control circuit board; and

one or more heat conducting elements arranged in correspondence with the one or more temperature sensors, the respective heat conducting elements being located between the temperature sensor and the at least one coil to be detected for conducting the temperature of the at least one coil to the temperature sensor, and

wherein the motor arrangement further comprises a fixing structure for at least partially fixing the position of the temperature detection assembly.

In a partially preferred embodiment, the respective heat conducting element is arranged to at least partially enclose the temperature sensor and/or the respective first electrical connection element.

In a preferred embodiment, the temperature sensor is directly electrically connected to the respective first electrical connection element.

In a preferred embodiment, the temperature sensor is electrically connected indirectly to the respective first electrical connection element.

In a partially preferred embodiment, the motor arrangement further comprises an insulating part, the fixing structure comprising one or more through holes formed on the insulating part allowing the temperature sensor and/or the respective first electrical connection element to extend through, the temperature sensor and/or the respective first electrical connection element being at least partially fixed in the respective through hole of the one or more through holes.

In a part of the preferred embodiment, the stator assembly further includes a stator frame around which the one or more coils are wound, and the insulating member is an insulating plate fixed to the stator frame, the insulating plate having the one or more through holes formed thereon.

In a partially preferred embodiment, the temperature sensor has:

a base; and

terminal portions extending from the base portion for electrical connection with the respective first electrical connection elements,

wherein the base is mounted on, abutting against, and at least partially covering an opening of the corresponding through hole formed on a surface of the insulating plate facing the side of the stator support, and wherein the terminal portion and/or the corresponding first electrical connection element extends at least partially in the through hole.

In a partially preferred embodiment, the first electrical connection element extends over the entire length of the through-hole and abuts the base of the temperature sensor at the opening.

In a preferred embodiment, an adhesive is provided between the temperature sensor and the insulating plate and/or between the respective first electrical connection element and the insulating plate, which adhesive adhesively fixes the temperature sensor to the insulating plate and/or the respective first electrical connection element to the insulating plate.

In a preferred embodiment, the insulating plate has a projection extending away from the stator support, wherein one or more through holes of the projection are formed in the projection, which are arranged corresponding to the one or more through holes on the insulating plate, and wherein the temperature sensor and/or the respective first electrical connection element is at least partially fixed in the respective through hole of the one or more through holes of the projection.

In a preferred embodiment, the motor arrangement further comprises a motor mount for securing the motor arrangement within the housing of the power tool, wherein the securing structure comprises one or more through holes formed in the motor mount allowing the temperature sensor and/or the respective first electrical connection element to extend therethrough, the temperature sensor and/or the respective first electrical connection element being at least partially secured in a respective through hole of the one or more through holes.

In a partially preferred embodiment, the motor mount comprises:

a plurality of wing portions extending on a plane orthogonal to an axial direction of the motor device for fixing the motor device in a housing of the electric tool; and

one or more extensions disposed between two adjacent wings of the plurality of wings extending toward the stator assembly, and wherein the one or more through holes are formed in the one or more extensions.

In a partially preferred embodiment, the extension is a hollow cylinder with a partial material cut away, wherein the heat conducting element is at least partially filled between this hollow cylinder and the temperature sensor and/or the corresponding first electrical connection element, and between the temperature sensor and the at least one coil to be detected.

In a partially preferred embodiment, the stator assembly further comprises a stator support on which the one or more coils are wound, and the motor arrangement further comprises an electrically conductive fixing plate fixed on the stator support, the fixing structure being formed by the fixing plate, wherein the one or more temperature sensors and the one or more first electrical connection elements are fixed to the fixing plate, and wherein an electrical connection is made between the temperature sensors and the respective first electrical connection elements through the fixing plate.

In a partially preferred embodiment, the stator assembly further comprises a stator frame around which the one or more coils are wound, the motor arrangement further comprises an insulated fixing plate fixed on the stator frame, the fixing structure being formed by the fixing plate, in which one or more second electrical connection elements are arranged, wherein the one or more temperature sensors and the one or more first electrical connection elements are fixed to the fixing plate, and wherein an electrical connection is made between the temperature sensors and the respective first electrical connection elements by means of the respective second electrical connection elements.

In a partially preferred embodiment, the one or more temperature sensors and the one or more first electrical connection elements are fixed to the conductive and/or insulating fixing plate by means of welding and/or bonding.

In a partially preferred embodiment, the heat conducting element is a heat conducting element made of a material having a heat conductivity coefficient greater than that of air.

In a partially preferred embodiment, the heat conducting element is a heat conducting element made of a heat conducting silicone.

In a partially preferred embodiment, the motor means is a dc brushless motor means.

According to another aspect of the present utility model there is provided a power tool whose operation is driven by a motor arrangement according to any of the preceding embodiments.

In a partially preferred embodiment, the power tool is a rotary sanding tool, wherein the rotary sanding tool includes a base and an operating portion operably coupled to the base.

In a partially preferred embodiment, the motor device is arranged in a housing of the operating part, and the control circuit board is arranged in a housing of the base.

With the electric tool and the temperature detection assembly thereof according to the present utility model, at least the following advantageous effects can be achieved:

(1) By arranging the control circuit board separately from the motor device, rather than being directly fixed in the motor device, the motor device structure can be simplified and compacted, and space can be saved; meanwhile, the control circuit board can be prevented from being influenced by heat generated by the motor device or less, the safety is guaranteed, the control circuit board and electronic components on the control circuit board are protected from being damaged due to temperature rise of the motor, the service life is prolonged, and the cost is saved; in addition, the motor device is convenient to be independently replaced when the motor device is damaged, and the control devices arranged together do not need to be replaced at the same time;

(2) The heat transfer is facilitated by arranging the heat conducting element between the temperature sensor and the coil to transfer heat, rather than through air transfer or through a smaller contact surface between the sensor and the coil, thereby improving temperature detection accuracy.

Drawings

For a better understanding of the above and other objects, features, advantages and functions of the present utility model, reference should be made to the preferred embodiments illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings. It will be appreciated by persons skilled in the art that the drawings are intended to schematically illustrate preferred embodiments of the utility model, and that the scope of the utility model is not limited in any way by the drawings, and that the various components are not drawn to scale.

Fig. 1 schematically illustrates a power tool according to a preferred embodiment of the present utility model;

fig. 2 schematically illustrates an internal configuration of an operation portion of the electric power tool shown in fig. 1, in which a partial structure is not shown;

fig. 3 to 4 schematically show a motor apparatus according to a preferred embodiment of the present utility model, wherein a partial structure of the motor apparatus is not shown;

fig. 5 to 7 schematically illustrate a temperature detection assembly of a motor apparatus according to a preferred embodiment of the present utility model, wherein a partial structure of the motor apparatus is not illustrated;

fig. 8 to 10 schematically illustrate a temperature detection assembly of a motor apparatus according to another preferred embodiment of the present utility model, wherein a partial structure of the motor apparatus is not illustrated;

fig. 11 to 12 schematically show a temperature detection assembly of a motor apparatus according to still another preferred embodiment of the present utility model, wherein a partial structure of the motor apparatus is not shown.

Reference numerals illustrate:

10. electric tool

100. Operation part

200. Base seat

300. Connecting part

120. Connection port

110. Tool head

130. Motor device

131. Motor shell

132. Rotor assembly

1321. Permanent magnet

1322. Rotor support

1323. Motor shaft

133. Stator assembly

1331. Stator support

1332. Coil

134. Current input part

135. Temperature detection assembly

1351. Temperature sensor

13511. Base part

13512. Terminal part

1352. First electric connecting element

1353. Fixing plate

1353' insulating board

13531. Through hole of insulating part

13532. Protruding part

13533. Through hole of protruding part

1354. Second electric connecting element

1355. Heat conducting element

136. Motor support

1361. Wing part

1362. Extension part

13621. Through hole of extension part

X1 motor axis

Detailed Description

Specific embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. What has been described herein is merely a preferred embodiment according to the present utility model, and other ways of implementing the utility model will occur to those skilled in the art on the basis of the preferred embodiment, and are intended to fall within the scope of the utility model as well.

The present utility model provides an electric power tool which can be, for example, a small electric power tool for home use, such as an electric drill, an electric hammer, an electric grinder, a cutting machine, or the like, and which can be conceived to have a tool head driven by a motor for various operations. Referring to fig. 1, there is shown by way of example a power tool 10 in accordance with a preferred embodiment of the present utility model, which in this embodiment is a rotary sanding tool. As shown in the drawing, the power tool 10 includes an operation portion 100 that can be held by a user to perform a grinding operation on a workpiece, a base 200 connected to a power source, and a connection portion 300 that connects the operation portion 100 to the base 200. The connection part 300 may be a wired electrical connection or a physical connection, or may be a wireless connection, and may include, for example, a component capable of realizing electrical connection such as a wire and transmitting information, a wireless signal transmission component, and the like. The operation portion 100 of the power tool 10 includes a tool head 110 and a connection port 120, and may be arranged in various manners, in which the tool head 110 is positioned at one end of the operation portion body in the axial direction X1, and the connection port 120 is positioned at the opposite end and is connectable to the connection portion 300. Preferably, the tool head 110 is detachably attached to the operation part main body, and in the present embodiment, the tool head 110 is a rotary sanding head for sanding a workpiece.

Further, fig. 2 shows the internal structure of the operation portion 100 of the electric power tool 10, and the external casing of the operation portion 100, the tool bit 110, and part of the structure inside the casing are not shown. Referring to fig. 2, the power tool 10 further has a motor means 130 for driving the tool head 110 to move, which includes a motor housing 131, a rotor assembly 132, a stator assembly 133, and a motor bracket 136 for fixing the motor means 130 to an outer housing of the operation part 100. Preferably, in the present embodiment, the motor device is a direct current brushless motor device. Preferably, in the present embodiment, the motor means is an outer rotor motor in which the stator assembly is located inside the rotor assembly.

Specifically, fig. 3 and 4 show detailed structural schematic diagrams of the rotor assembly 132 and the stator assembly 133, respectively. Referring to fig. 3, the rotor assembly 132 includes: a rotating unit having one or more permanent magnets 1321 rotated by magnetic force when the motor is energized, a rotor bracket 1322 for fixing the permanent magnets, and a motor shaft 1323 fixed at the center of the rotor bracket 1322. When the permanent magnet rotates, it drives the rotor support to rotate, which in turn transfers the rotation to the motor shaft, which in turn transfers the rotational motion to an output shaft (not shown) of the power tool via a transmission (not shown), thereby driving the tool head 110 attached to the output shaft to rotate. Referring to fig. 4, the stator assembly 133 includes: a stator frame 1331 having one or more teeth protruding inward, and a coil unit having one or more coils 1332 wound on the teeth of the stator frame. When energized, the current passing through coil 1332 generates a magnetic field force that drives the permanent magnets 1321 of the rotor assembly into rotation.

It will be appreciated that the above description of the rotor assembly and stator assembly of the motor apparatus is merely exemplary, and that any type of motor may be selected as desired by those skilled in the art.

Further, with continued reference to fig. 2, the motor apparatus further includes a current input member 134, such as a wire, electrically connected at one end to the coil 1332 for delivering phase current to the coil. In a preferred embodiment, the current input member 134 is gathered at the other end to the connection port 120 to be further electrically connected to the base 200 through the connection part 300. According to a preferred embodiment of the present utility model, a control device for controlling the operation of the motor is arranged in the base 200, which comprises, for example, a control circuit board (not shown) and electronic components arranged on the control circuit board for controlling/regulating various operating parameters of the motor device, such as rotational speed, commutation, torque, etc. The current input part 134 is electrically connected to a control circuit board in the base 200 through the connection part 300 so that the motor device can be operated in a plurality of different modes under the control of the control device.

The above arrangement of the present utility model, i.e., the arrangement of the control circuit board separately from the motor device 130, preferably at a position remote from the motor device (e.g., in the base 200), instead of being directly fixed in or near the motor device 130, can simplify the structure of the motor device (only some electric connection and information transmission means such as wires need to be arranged in the motor device to realize the electric coupling and communication functions between the motor device and the control device), save space; meanwhile, the heat generated by the control circuit board far away from the motor device can be guaranteed, so that the control circuit board is not or less influenced by the temperature rise of the motor, the safety is guaranteed, the control circuit board and electronic components on the control circuit board are protected from being damaged due to the temperature rise of the motor, the service life is prolonged, and the cost is saved; it also facilitates independent replacement in the event of failure of the motor arrangement without the need to replace the control devices together at the same time.

It will be appreciated that the position of the control circuit board is not limited to being disposed in the base in this embodiment, and those skilled in the art may dispose the control circuit board separately from the motor device 130, preferably at a position apart from the motor device 130 other than the motor device according to actual situations (e.g., a power tool structure, a use requirement, etc.), for example, in the rotary sanding tool of the present utility model, and may dispose the control device at a position apart from the motor device 130 in the operation part 100.

Further, to avoid abnormal temperature rise during operation of the motor apparatus, a temperature detection assembly 135 is provided for detecting the temperature of the motor apparatus 130, particularly the one or more coils 1332, and transmitting temperature information to the control circuit board.

Further in accordance with a preferred embodiment of the present utility model, temperature sensing assembly 135 comprises: one or more temperature sensors disposed near at least one of the one or more coils 1332 for detecting a temperature of the at least one coil; one or more first electrical connection elements disposed in correspondence with the one or more temperature sensors, wherein the respective first electrical connection elements electrically connect the temperature sensors to a control circuit board of the power tool disposed separately from the motor device, transmitting temperature information detected by the temperature sensors to the control circuit board; and one or more heat conductive elements disposed in correspondence with the one or more temperature sensors, the respective heat conductive elements being located between the temperature sensors and at least one coil 1332 to be detected for conducting the temperature of the at least one coil 1332 to the temperature sensors. The motor arrangement further comprises a fixing structure for at least partially fixing the position of the temperature detection assembly 135.

In one aspect, the above-described relative arrangement of the temperature sensing assembly of the present utility model is capable of allowing heat generated by the coil to be transferred to the temperature sensor through the thermally conductive element, rather than through air in a gap between the temperature sensor and the coil or through a direct contact between the temperature sensor and the coil. Since the heat conducting element such as heat conducting glue (e.g. heat conducting silica gel, etc.) has a certain deformability, it can be more tightly and shape-adaptively attached to the coil surface (so its contact area is much larger than that when the temperature sensor is in direct contact with the coil), and is filled between the coil surface and the temperature sensor, the heat of the coil is transferred to the temperature sensor, and since the heat conducting coefficient of the heat conducting element is larger than that of air, its heat conducting property is better and the temperature detection is more accurate. On the other hand, in contrast to the prior art arrangements, such as clamping the temperature sensor between the coil and the teeth of the stator frame, the present utility model provides a fixed structure for the temperature detection assembly such that during operation the temperature detection assembly, in particular the temperature sensor and the first electrical connection element, is not easily displaced, thus ensuring the reliability of the detection. The heat-conducting element itself may preferably also have a certain viscosity in order to at least partially adhesively fix the temperature sensor relative to the coil.

Next, several preferred embodiments of the temperature sensing assembly according to the present utility model are described in detail with reference to fig. 5 to 12. Referring first to fig. 5, for clarity, some of the structures in motor arrangement 130 are not shown. The temperature detecting assembly 135 includes a temperature sensor 1351 disposed near the coil 1332 for detecting the surface temperature of the coil, and a first electrical connection member 1352 electrically connected to the temperature sensor 1351, which electrically connects the temperature sensor 1351 to the connection port 120 and thus to a control circuit board (only a portion of the length of the first electrical connection member near the motor device is shown in fig. 5) located in the base 200 for controlling the operation of the motor by the connection part 300, and transmits detected temperature information to the control circuit board, which in turn can control and/or adjust the operation of the motor according to the temperature information, ensuring the normal operation of the motor. The first electrical connection element 1352 may be, for example, a wire or other electronic components capable of implementing electrical connection and information transmission functions as will occur to those of skill in the art.

Alternatively, the number of temperature sensors 1351 may be one or more, which may be arranged near the same coil or distributed near different coils as desired, and preferably the first electrical connection elements 1352 are provided corresponding to the temperature sensors 1351, i.e. each temperature sensor is preferably provided with a corresponding first electrical connection element.

Further preferably, a heat conducting element (not shown) is disposed between the temperature sensor 1351 and the surface of the coil 1332 to be detected, and the heat conducting element may be a deformable gel-like material such as a heat conducting gel (heat conducting silica gel), which may adapt to different shapes, such as an uneven surface of the coil, so as to closely fit the coil surface to increase the contact heat conducting area. More preferably, the heat conducting element may have a certain viscosity to prevent displacement of the temperature sensor relative to the coil surface to a certain extent. More preferably, the heat conducting element may be arranged to at least partially enclose the temperature sensor, to reduce contact of the sensor with nearby air, improving detection accuracy. It will be appreciated that other types of heat conducting elements, such as heat conducting patches, etc., may be selected as desired by those skilled in the art to suit different application scenarios. Alternatively, the number of heat conducting elements may be one or more, preferably the heat conducting elements are arranged in correspondence with the temperature sensors, i.e. each temperature sensor is preferably provided with a respective heat conducting element.

It is further preferred that a fixing structure for fixing the temperature detecting assembly 135 is also provided in the motor device 130. In the present embodiment, the fixing structure is a fixing plate 1353, and the fixing plate 1353 is fixed by one or more pins extending from the stator frame 1331 toward the motor frame 136 (see fig. 2), and thus is fixed in the motor device. It will be appreciated that the fixed plate 1353 may be secured to other structures in the motor apparatus in a manner other than that described above.

Further preferably, in the present embodiment, the temperature sensor is electrically connected indirectly to the first electrical connection element. Preferably, the temperature sensor 1351 is disposed on a side surface of the fixing plate 1353 facing the coil 1332 or the stator support 1331, positioned close to the coil. Preferably, as shown in fig. 6, the temperature sensor 1351 has a base portion (i.e., sensing portion) 13511 and a terminal portion 13512 extending from the base portion 13511, and when fixedly mounted to the fixing plate 1353, the terminal portion 13512 passes through a predetermined hole in the fixing plate and is fixed in the hole by means of, for example, welding or gluing, and the base portion 13511 abuts on a surface of the fixing plate facing the side of the coil or stator frame 1331. Further preferably, a corresponding first electrical connection element 1352 is arranged on the other side surface of the fixation plate 1353 remote from the coil 1332, which may be passed through a preset hole in the fixation plate at a different location than the temperature sensor preset hole, fixed in the hole by means of welding or gluing or the like.

Alternatively, the fixing plate 1353 may be provided as a conductive fixing plate capable of performing a conductive and information transmission function, in which case the temperature sensor 1351 and the first electrical connection element 1352 are directly electrically connected to the conductive fixing plate 1353, and temperature information is transmitted to the first electrical connection element 1352 by the fixing plate. Or alternatively, the fixation plate 1353 may be provided as an insulated fixation plate, in which case, referring to fig. 7 (wherein the fixation plate 1353 is not shown to show its internal arrangement), a second electrical connection element 1354 is embedded within the insulated fixation plate 1353, which is electrically connected between the temperature sensor and the first electrical connection element, to enable temperature information transmission. It is understood that the second electrical connection element 1352 may be, for example, a wire or other electronic component capable of performing electrical connection and information transfer functions as would occur to one skilled in the art.

Next, another preferred embodiment of the temperature sensing assembly according to the present utility model is exemplarily described with reference to fig. 8 to 10, wherein the same structure is not repeated. As shown in fig. 8, in the present embodiment, the above-described fixing structure is an insulating member, such as an insulating plate 1353', which may also be fixed to the stator frame 1331 by receiving the pins of the stator frame through the pin holes formed in the plate as described in the previous embodiment. Unlike the foregoing embodiment, the temperature sensor 1351 in this example is directly electrically connected to the first electrical connection element 1352, as shown in fig. 10, the terminal portion of the temperature sensor 1351 is directly electrically connected to the first electrical connection element 1352, and the end portion of the first electrical connection element abuts on the base portion of the temperature sensor 1351.

It is further preferred that the insulating plate 1353' is formed with one or more through holes 13531, and the temperature sensor 1351 and/or the first electrical connection element 1352 electrically connected thereto at least partially pass through the respective through holes 13531 and are fixed in the through holes by welding or gluing or the like. Preferably, in the embodiment shown in fig. 8, when fitted into the through hole, the terminal portion 13512 of the temperature sensor extends in the through hole 13531 and is electrically connected with the corresponding terminal portion on the first electrical connection element, and the base 13511 abuts on a side surface of the insulating plate 1353' facing the coil or the stator support 1331, at least partially covering an opening of the through hole 13531 formed on the side surface. For reliability of the connection, the first electrical connection element 1352 preferably passes through the entire length of the through-hole, abutting the base of the temperature sensor at the opening described above. It is further preferred that in order to further obtain a more reliable fixation, an adhesive is provided between the temperature sensor and the insulating plate (e.g. at the abutment of the base and the insulating plate) and/or between the first electrical connection element and the insulating plate (e.g. between the via side wall and the outer surface of the first electrical connection element) to adhesively fix the temperature sensor and the insulating plate and/or to adhesively fix the first electrical connection element and the insulating plate.

Further preferably, as shown in fig. 9, in order to further improve reliability, the insulating plate 1353 'further has a protrusion 13532 extending away from the coil or the stator support, wherein one or more through holes 13533 provided in the protrusion 13532 corresponding to the one or more through holes 13531 on the insulating plate 1353' are formed, and wherein the temperature sensor 1351 and/or the respective first electrical connection element 1352 are at least partially fixed in the respective through holes 13533 of the protrusion. The provision of the protrusion 13532 and its through-hole 13533 allows at least a portion of the first electrical connection element 1352 and/or the temperature sensor 1351 to be further secured, which increases the length of the securing section by extending the length of the through-hole on the insulating plate, making the securing relationship more secure.

By arranging the temperature sensor and the first electrical connection element in direct electrical connection in such an embodiment as described above with respect to fig. 8 to 10, the need for providing the second electrical connection element 1354 in addition or the fixing plate 1353 as a conductive fixing plate as in the embodiment shown in fig. 5 to 7 is eliminated, thereby saving material, and the pair of temperature sensor and first electrical connection element which are electrically connected can extend in the same through hole, thereby reducing the number of through holes which need to be preset and reducing the processing complexity.

Next, still another preferred embodiment of the temperature detecting assembly according to the present utility model will be exemplarily described with reference to fig. 11 to 12, wherein the same structure is not repeated. Unlike the arrangement of the fixing structure fixed to the stator frame in the above embodiment, the fixing structure in the present embodiment is formed in the motor frame 136. Specifically, the motor bracket 136 has a plurality of wing portions 1361 extending on a plane orthogonal to the axial direction X1 of the motor apparatus for fixing the motor apparatus within a housing of the electric power tool (for example, within a housing of the operation portion 100). One or more extension portions 1362 extending in the direction of the coil or the stator frame are provided between adjacent two wing portions, and one or more through holes 13621 are formed in the extension portions. In this embodiment, the temperature sensor 1351 is also directly connected to the first electrical connection element 1352 and is at least partially secured therein through a corresponding through-hole 13621.

It is further preferred that the extension 1362 is a hollow cylinder with a portion of material cut away (in particular, a portion of material cut away from the side of the coil) as shown in fig. 11, which forms a loop portion at the side close to the coil through which at least a portion of the temperature sensor and/or the first electrical connection element passes. Further preferably, referring to fig. 12, a thermally conductive element 1355, preferably a thermally conductive silicone 1355 having an adhesive property, may at least partially surround the temperature sensor and the first electrical connection element, which fills between the temperature sensor and the coil to be detected and between the hollow cylinder and the temperature sensor and/or the first electrical connection element to fix the temperature sensor and/or the first electrical connection element with respect to the coil and the extension 1362.

It will be appreciated that this arrangement of the present embodiment does not require the addition of additional plate-like components such as those described above, but rather provides a direct attachment to an existing motor mount, which further simplifies construction and saves material.

The temperature sensor in the above embodiments may be any type of temperature sensor that can be conceived by a person skilled in the art, preferably an NTC sensor and/or a PTC sensor.

The foregoing description of various embodiments of the utility model has been presented for the purpose of illustration to one of ordinary skill in the relevant art. It is not intended that the utility model be limited to the exact embodiment disclosed or as illustrated. As above, many alternatives and variations of the present utility model will be apparent to those of ordinary skill in the art. Thus, while some alternative embodiments have been specifically described, those of ordinary skill in the art will understand or relatively easily develop other embodiments. The present utility model is intended to embrace all alternatives, modifications and variations of the present utility model described herein and other embodiments that fall within the spirit and scope of the utility model described above.

Claims (23)

1. A motor arrangement (130) operable to drive operation of a power tool (10), the motor arrangement (130) comprising:

a rotor assembly (132); and

a stator assembly (133) comprising a coil unit having one or more coils (1332);

characterized in that the motor arrangement further comprises a temperature detection assembly (135) comprising:

one or more temperature sensors (1351) disposed in proximity to at least one coil (1332) of the one or more coils for detecting a temperature of the at least one coil;

one or more first electrical connection elements (1352) arranged in correspondence with the one or more temperature sensors (1351), wherein the respective first electrical connection elements electrically connect the temperature sensors to a control circuit board of the electric tool arranged separately from the motor means, transmitting temperature information detected by the temperature sensors (1351) to the control circuit board; and

one or more heat conducting elements arranged in correspondence with the one or more temperature sensors (1351), the respective heat conducting elements being located between the temperature sensor (1351) and the at least one coil (1332) to be detected for conducting the temperature of the at least one coil to the temperature sensor, and

wherein the motor arrangement (130) further comprises a fixing structure for at least partially fixing the position of the temperature detection assembly (135).

2. Motor arrangement (130) according to claim 1, characterized in that the respective heat conducting element is arranged to at least partly enclose the temperature sensor (1351) and/or the respective first electrical connection element (1352).

3. The motor arrangement (130) according to claim 1, wherein the temperature sensor (1351) is directly electrically connected with the respective first electrical connection element (1352).

4. The motor arrangement (130) of claim 1, wherein the temperature sensor (1351) is electrically connected indirectly to the respective first electrical connection element (1352).

5. A motor arrangement (130) according to claim 3, further comprising an insulating member, the fixation structure comprising one or more through holes formed on the insulating member allowing the temperature sensor (1351) and/or the respective first electrical connection element (1352) to extend through, the temperature sensor and/or the respective first electrical connection element being at least partially fixed in a respective through hole of the one or more through holes.

6. The motor apparatus (130) of claim 5, wherein the stator assembly (133) further comprises a stator support (1331) around which the one or more coils (1332) are wound, the insulating member being an insulating plate (1353') secured to the stator support (1331), the insulating plate having the one or more through holes formed therein.

7. The motor apparatus (130) according to claim 6, wherein the temperature sensor (1351) has:

a base (13511); and

terminal portions (13512) extending from the base portions for electrical connection with the respective first electrical connection elements (1352),

wherein the base (13511) is mounted on, against and at least partially covers an opening formed in, a surface of the insulating plate (1353') facing the side of the stator support (1331), and wherein the terminal portion and/or the respective first electrical connection element (1352) extends at least partially in the through hole.

8. The motor arrangement (130) of claim 7, wherein the first electrical connection element (1352) extends over the entire length of the through-hole and abuts the base (13511) of the temperature sensor (1351) at the opening.

9. Motor arrangement (130) according to claim 6, characterized in that an adhesive is provided between the temperature sensor (1351) and the insulating plate (1353 ') and/or between the respective first electrical connection element (1352) and the insulating plate (1353'), which adhesive adhesively secures the temperature sensor and the insulating plate and/or the respective first electrical connection element and the insulating plate.

10. The motor arrangement (130) of claim 6, wherein the insulating plate (1353') has a protrusion (13532) extending away from the stator support (1331), wherein one or more through holes of the protrusion are formed therein, the protrusion being arranged corresponding to the one or more through holes on the insulating plate, and wherein the temperature sensor (1351) and/or the respective first electrical connection element (1352) are at least partially secured in a respective through hole of the one or more through holes of the protrusion (13532).

11. A motor arrangement (130) according to claim 3, further comprising a motor mount (136) for securing the motor arrangement within a housing of the power tool (10), wherein the securing structure comprises one or more through holes formed on the motor mount allowing the temperature sensor (1351) and/or the respective first electrical connection element (1352) to extend therethrough, the temperature sensor and/or the respective first electrical connection element being at least partially secured in a respective through hole of the one or more through holes.

12. The motor apparatus (130) of claim 11, wherein the motor bracket (136) includes:

a plurality of wings (1361) extending on a plane orthogonal to an axis (X1) direction of the motor device for fixing the motor device within a housing of the power tool; and

one or more extensions (1362) disposed between adjacent two of the plurality of wings extending toward the stator assembly, and wherein the one or more through holes are formed in the one or more extensions.

13. The motor arrangement (130) according to claim 12, characterized in that the extension (1362) is a hollow cylinder with a portion of material cut away, wherein the heat conducting element (1355) is at least partially filled between the hollow cylinder and the temperature sensor and/or the respective first electrical connection element, and between the temperature sensor and the at least one coil (1332) to be detected.

14. The motor arrangement (130) of claim 4, wherein the stator assembly (133) further comprises a stator support (1331) on which the one or more coils (1332) are wound, the motor arrangement further comprising an electrically conductive fixation plate (1353) fixed on the stator support (1331), the fixation structure being formed by the fixation plate, wherein the one or more temperature sensors and the one or more first electrical connection elements are fixed to the fixation plate, and wherein an electrical connection is achieved between the temperature sensors (1351) and the respective first electrical connection elements (1352) through the fixation plate (1353).

15. The motor arrangement (130) of claim 4, wherein the stator assembly (133) further comprises a stator support (1331) on which the one or more coils (1332) are wound, the motor arrangement further comprising an insulated fixing plate (1353) fixed on the stator support (1331), the fixing structure being formed by the fixing plate in which one or more second electrical connection elements (1354) are arranged, wherein the one or more temperature sensors and the one or more first electrical connection elements are fixed to the fixing plate, and wherein an electrical connection is achieved between the temperature sensors (1351) and the respective first electrical connection elements (1352) by means of the respective second electrical connection elements (1354).

16. The motor arrangement (130) according to claim 14, wherein the one or more temperature sensors and the one or more first electrical connection elements are fixed to the electrically conductive fixing plate by means of soldering and/or bonding.

17. The motor arrangement (130) according to claim 15, wherein the one or more temperature sensors and the one or more first electrical connection elements are fixed to the insulating fixing plate by means of welding and/or bonding.

18. The motor apparatus (130) of claim 1, wherein the thermally conductive element is a thermally conductive element made of a material having a thermal conductivity greater than air.

19. The motor apparatus (130) of claim 18, wherein the thermally conductive element is a thermally conductive element made of thermally conductive silicone.

20. The motor arrangement (130) according to claim 1, wherein the motor arrangement (130) is a direct current brushless motor arrangement.

21. An electric power tool (10) whose operation is driven by a motor arrangement (130) according to any one of claims 1 to 19.

22. The power tool (10) of claim 21, wherein the power tool is a rotary grinding tool, wherein the rotary grinding tool includes a base (200) and an operating portion (100) operably coupled to the base.

23. The electric tool according to claim 22, characterized in that the motor means (130) is arranged in a housing of the operating portion (100), and the control circuit board is arranged in a housing of the base (200).