Motor temperature detection device and motor

Abstract

The utility model relates to the technical field of temperature detection, in particular to a motor temperature detection device and a motor. The motor temperature detection device comprises a temperature sampling circuit and a thermistor. The temperature sampling circuit is arranged on a circuit board in the motor; the thermistor is arranged on the circuit board and is electrically connected with the temperature sampling circuit; when the circuit board is installed on the motor, the thermistor can extend into the housing of the motor. The motor comprises the motor temperature detection device. The thermistor directly extends into the shell of the motor, so that the thermistor can directly detect the temperature of the shell, and the temperature detection of the motor is more accurate. When the temperature of the motor changes, the thermistor can detect the change information of the temperature of the motor in time. The thermistor directly extends into the shell to detect the temperature, so that the thermistor can be prevented from being influenced by electronic components on the circuit board and the environment temperature, and the accuracy of detecting the temperature of the motor is further ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to temperature detection technical field, concretely relates to a motor temperature detection device and motor. BACKGROUND

[0002] With the continuous development of automobile electrification and intelligentization, electronic power steering system (EPS) is more and more popular. Motor and integrated controller are the core components of EPS. Motor temperature is important to motor and controller electronic components, therefore, motor temperature control as an important part of motor control, its requirements are also higher and higher.

[0003] At present, the temperature detection of steering motor is mainly through the thermal resistance sensor near MOSFET to obtain the motor temperature. The method is an indirect measurement method, and the thermal resistance actually collects the air temperature near MOSFET. The temperature of the area is mainly the temperature generated by the heat superposition of MOSFET and motor shell, and is greatly affected by external environment temperature, so the accuracy and stability of temperature collection are poor. UTILITY MODEL CONTENTS

[0004] In view of the above problems existing in the prior art, the utility model provides a motor temperature detection device and motor.

[0005] In order to solve the above technical problems, the utility model solves them through the following technical schemes:

[0006] Firstly, a motor temperature detection device is provided, which comprises a temperature sampling circuit and a thermal resistance.

[0007] The temperature sampling circuit is arranged on the circuit board in the motor.

[0008] The thermal resistance is arranged on the circuit board and electrically connected with the temperature sampling circuit.

[0009] When the circuit board is installed on the motor, the thermal resistance can be inserted into the shell of the motor to detect the temperature of the shell.

[0010] Preferably, the shell is provided with a detection hole, and when the circuit board is installed on the motor, the thermal resistance is at least partially inserted into the detection hole.

[0011] Preferably, the detection hole is arranged in the shell and opens at one end of the shell.

[0012] Preferably, a heat conducting member is arranged in the detection hole and / or on the thermal resistance, and when the circuit board is installed on the motor, the thermal resistance is in contact with the inner side wall of the detection hole through the heat conducting member.

[0013] Preferably, the heat-conducting member can wrap the thermistor when the circuit board is mounted on the motor.

[0014] Preferably, the heat-conducting member is heat-conducting silicone grease.

[0015] Preferably, the temperature sampling circuit is electrically connected with a control circuit, a driving circuit and a power supply circuit on the circuit board.

[0016] In a second aspect, a motor is provided, comprising a housing, a circuit board and a cover plate; the circuit board is fixedly mounted on the housing by bolts; the cover plate is fixedly mounted on the housing by a buckle to shield the circuit board; the housing and the circuit board are provided with the motor temperature detection device as described above.

[0017] Preferably, the circuit board is provided with a connector for connecting the cover plate and / or external equipment.

[0018] The utility model at least has the following beneficial effects:

[0019] 1. The thermistor directly extends into the interior of the housing of the motor, so that the thermistor can directly detect the temperature of the housing, i.e. the thermistor can directly detect the temperature of the motor through the housing, so that the temperature detection of the motor is more accurate.

[0020] 2. When the temperature of the motor changes, the thermistor can timely detect the change information of the temperature of the motor, preferably avoiding the hysteresis of the motor temperature detection.

[0021] 3. Since the thermistor directly extends into the housing to detect the temperature, it can preferably avoid being affected by the electronic components on the circuit board and the ambient temperature, thereby preferably ensuring the accuracy of the temperature detection of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 An explosion schematic diagram of the motor in some embodiments of the application is shown;

[0023] Figure 2 A partial schematic diagram of the circuit board mounted on the housing in some embodiments of the application is shown.

[0024] The names of the parts referred to by the numbers in the drawings are as follows:

[0025] 10. Heat-conducting member; 100. Housing; 110. Detection hole; 200. Circuit board; 210. Thermistor; 220. Electronic component; 230. Connector; 300. Cover plate; 400. Bolt; 500. Buckle. DETAILED DESCRIPTION

[0026] For further understanding of the present application, the application will be described in detail with reference to the drawings and embodiments. It should be understood that the embodiments are only used to explain the present application but not to limit the present application.

[0027] In a first aspect, as shown in Figure 1 and Figure 2 In the embodiment, a motor temperature detection device is provided, which comprises a temperature sampling circuit (not shown in the figure) and a thermistor 210 arranged on a circuit board 200 in the motor, and the thermistor 210 is electrically connected with electronic components 220 in the temperature sampling circuit, so that the thermistor 210 can realize electrical connection with the temperature sampling circuit. It can be understood that the resistance value of the thermistor 210 can change with the change of temperature, so that different voltage values can be obtained at different temperatures, and since the temperature sampling circuit is electrically connected with the thermistor 210, the temperature sampling circuit can obtain the voltage value. The control circuit (not shown in the figure), the driving circuit (not shown in the figure) and the power supply circuit (not shown in the figure) are further arranged on the circuit board 200, and the temperature sampling circuit can be directly or indirectly electrically connected with the control circuit, the driving circuit and the power supply circuit. The power supply circuit is used for supplying power to the temperature sampling circuit, the control circuit and the driving circuit, and after obtaining the voltage value, the temperature sampling circuit can send the voltage information to the control circuit, so that the control circuit can process and analyze the voltage information, and then obtain the temperature value corresponding to the voltage value. The control circuit can further control the driving circuit according to the temperature value, so that the driving circuit adjusts the working state of the motor, for example, reduces the motor torque, so as to reduce the temperature of the motor.

[0028] Further, in the process of assembling the motor, the circuit board 200 is fixedly installed in the motor, and when the circuit board 200 is installed on the motor, the thermistor 210 arranged on the circuit board 200 can extend into the shell 100 of the motor, so that the thermistor 210 can directly detect the temperature of the shell 100 of the motor.

[0029] It should be noted that the thermistor 210 directly extends into the inside of the shell 100 of the motor, so that the thermistor 210 can directly detect the temperature of the shell 100, that is, the thermistor 210 can directly detect the temperature of the motor through the shell 100, so that the temperature detection of the motor is more accurate, and when the temperature of the motor changes, the thermistor 210 can also detect the change information of the temperature of the motor in time, preferably avoiding the hysteresis of the motor temperature detection. Further, since the thermistor 210 directly extends into the shell 100 to detect the temperature, it can preferably avoid being affected by the electronic components 220 on the circuit board 200 and the ambient temperature, thereby preferably ensuring the accuracy of the detection of the temperature of the motor.

[0030] In some embodiments, a detection hole 110 is formed on the shell 100, which can be used for the thermistor 210 to extend into. When the circuit board 200 is installed on the motor, the position of the thermistor 210 can be aligned with the position of the detection hole 110, so that the thermistor 210 can extend into the detection hole 110, and then after the circuit board 200 is fixed on the motor, the thermistor 210 can stably be in the detection hole 110.

[0031] Further, when the circuit board 200 is fixed on the motor, at least part of the thermistor 210 extends into the detection hole 110, preferably, the entire thermistor 210 extends into the detection hole 110, so that the thermistor 210 detects the temperature of the shell 100 more accurately.

[0032] It can be understood that the detection hole 110 on the shell 100 can preferably meet the extension of the thermistor 210 on the circuit board 200, so that the thermistor 210 can preferably detect the temperature of the shell 100, and realize the accuracy and timeliness of the thermistor 210 detecting the temperature of the motor through the shell 100.

[0033] Further, since in the installed state, the shell 100 can wrap the thermistor 210 through the detection hole 110, so that the shell 100 can play a certain protective role for the thermistor 210, and can avoid the thermistor 210 from being touched by the outside, thereby improving the stability of the thermistor 210 work. And the detection hole 110 can also play a limiting role for the thermistor 210, so that the detection hole 110 can limit the thermistor 210 inside the shell 100 during the motor working process and the motor moving in space with other equipment, thereby making the thermistor 210 can always stably detect the temperature of the shell 100, so that the thermistor 210 has better accuracy and timeliness for detecting the temperature of the motor. Of course, since the shell 100 wraps the thermistor 210 inside through the detection hole 110, so that the shell 100 can isolate the temperature of the electronic components 220 on the circuit board 200 and the temperature of the external environment to a certain extent, so as to avoid affecting the accuracy of the thermistor 210 for detecting the temperature of the motor.

[0034] In some embodiments, the detection hole 110 is specifically opened in the inside of the shell 100, and one end of the axial direction of the detection hole 110 is opened on the shell 100, that is, the detection hole 110 is a structure with only one end opening. When the circuit board 200 is installed on the shell 100, the thermistor 210 can extend into the detection hole 110, so that the thermistor 210 can form a certain plugging for the detection hole 110, thereby making the air in the detection hole 110 not better flow with the air outside, so that the temperature in the detection hole 110 is not easy to diffuse to the outside.

[0035] When the motor works to generate heat to make the temperature of the shell 100 rise, the temperature in the detection hole 110 will also rise synchronously. Since in the installed state, the thermistor 210 can form a certain plugging for the detection hole 110, so that the temperature in the detection hole 110 is not easy to diffuse, thereby the thermistor 210 in the detection hole 110 can better reflect the actual temperature of the motor for detecting the temperature of the detection hole 110, and can better improve the accuracy of the thermistor 210 for detecting the temperature of the motor.

[0036] In some embodiments, a heat-conducting piece 10 is arranged in the detection hole 110 and / or on the thermistor 210. The heat-conducting piece 10 can be arranged in the detection hole 110 and / or on the thermistor 210 by bonding or other means. When the circuit board 200 is fixedly installed on the motor, the thermistor 210 can indirectly contact the inner side wall of the detection hole 110 through the heat-conducting piece 10, that is, the heat-conducting piece 10 can contact the inner side wall of the detection hole 110 and the thermistor 210 respectively.

[0037] It can be understood that the heat-conducting piece 10 can preferably transmit heat. When the heat-conducting piece 10 is in contact with the inner side wall of the detection hole 110 and the thermistor 210 respectively, heat generated by the motor during operation can be preferably transmitted to the heat-conducting piece 10 through the shell 100, and the heat-conducting piece 10 can preferably transmit the heat absorbed by the shell 100 to the thermistor 210, so that the thermistor 210 can preferably detect the temperature of the shell 100, and the thermistor 210 detects the temperature of the motor.

[0038] Since the heat-conducting piece 10 is in direct contact with the inner side wall of the detection hole 110 and the thermistor 210, the heat is indirectly transmitted through the air, so that the heat transmission efficiency is faster, and the accuracy and timeliness of the thermistor 210 detecting the temperature of the shell 100 can be preferably improved.

[0039] In some embodiments, when the circuit board 200 is fixedly installed on the motor, the heat-conducting piece 10 can wrap the thermistor 210. Specifically, the heat-conducting piece 10 can be a hard material or a flexible material. When the heat-conducting piece 10 is a hard material, the heat-conducting piece 10 needs to be sleeved and wrapped on the thermistor 210 in advance before installation. When the heat-conducting piece 10 is a flexible material, the heat-conducting piece 10 can be sleeved on the thermistor 210 in advance before installation, or the heat-conducting piece 10 can be installed in the detection hole 110 in advance. During installation, the thermistor 210 can be sleeved and wrapped on the heat-conducting piece 10 by extruding the heat-conducting piece 10. By wrapping the thermistor 210 with the heat-conducting piece 10, the collision between the thermistor 210 and the inner side wall of the detection hole 110 during the operation of the motor and the movement of the motor with other equipment in space can be preferably avoided.

[0040] It is worth mentioning that by wrapping the thermistor 210 with the heat-conducting piece 10, the contact area between the heat-conducting piece 10 and the thermistor 210 is larger, the heat-conducting piece 10 can better transmit heat to the thermistor 210, and the detection of the thermistor 210 for temperature is more accurate and timely. Of course, by designing the shape of the heat-conducting piece 10, the contact area between the heat-conducting piece 10 and the inner side wall of the detection hole 110 is larger in the installed state, the heat-conducting piece 10 can better absorb the heat on the shell 100 and further transmit it to the thermistor 210, so that the detection of the thermistor 210 for temperature is more accurate and timely.

[0041] Further, due to the wrapping of the heat-conductive piece 10 to the thermistor 210, and the contact of the heat-conductive piece 10 to the inner side wall of the detection hole 110 and the thermistor 210 respectively, the heat-conductive piece 10 can preferably play a protective role to the thermistor 210, maintain the stability of the thermistor 210 in the detection hole 110, and avoid the thermistor 210 from shaking and the like. When the heat-conductive piece 10 is of a flexible material, during the operation of the motor and the movement of the motor along with other equipment in the space, the heat-conductive piece 10 can buffer the thermistor 210 through its own elasticity, thereby improving the stability of the thermistor 210 in the detection hole 110, and making the use of the thermistor 210 more reliable.

[0042] In some embodiments, the heat-conductive piece 10 is a heat-conductive silicone grease. Of course, the heat-conductive piece 10 can also be a hard material such as silver, copper, aluminum nitride or silicon carbide, and can also be a flexible material such as heat-conductive glue, graphite paper or organic silicon, and the like, without particular limitation.

[0043] When the circuit board 200 is fixedly installed on the motor, the position of the thermistor 210 is aligned with the position of the detection hole 110, so that the thermistor 210 moves towards the direction of the detection hole 110. When the thermistor 210 extends into the detection hole 110, the thermistor 210 will extrude the heat-conductive silicone grease, so that the heat-conductive silicone grease filled in the detection hole 110 deforms to wrap the thermistor 210. When the thermistor 210 completely extends into the detection hole 110, the heat-conductive silicone grease completely wraps the thermistor 210. In this state, the thermistor 210 and the inner side wall of the detection hole 110 are completely filled with the heat-conductive silicone grease, so that the heat-conductive silicone grease can be in full contact with the thermistor 210 and the inner side wall of the detection hole 110, so that the heat of the shell 100 can be preferably transmitted to the thermistor 210, and the thermistor 210 has better accuracy and timeliness in detecting the temperature of the shell 100.

[0044] It can be understood that, since the heat-conductive silicone grease is a flexible material, during the operation of the motor and the movement of the motor along with other equipment in the space, the heat-conductive silicone grease can deform to buffer and protect the thermistor 210, and can also avoid the thermistor 210 from touching the inner side wall of the detection hole 110, thereby improving the stability of the state of the thermistor 210, and making the use of the thermistor 210 more reliable.

[0045] In a second aspect, in combination with Figure 1 and Figure 2As shown, the motor provided in the embodiment includes a shell 100, a circuit board 200 and a cover plate 300, wherein the circuit board 200 is fixedly installed on the shell 100 through bolts 400, the cover plate 300 is also fixedly installed on the shell 100 through buckles 500, and the cover plate 300 can shield the circuit board 200 fixedly installed on the shell 100 in the installed state.

[0046] Further, the thermistor 210, the temperature sampling circuit, the control circuit, the driving circuit and the power supply circuit are arranged on the circuit board 200, the detection hole 110 is formed on the shell 100, when the circuit board 200 is fixedly installed on the motor, the thermistor 210 can extend into the detection hole 110, thereby preferably detecting the temperature of the shell 100, so that the thermistor 210 has better accuracy and timeliness in detecting the temperature of the motor.

[0047] In some embodiments, the circuit board 200 is also provided with a connector 230, when the circuit board 200 and the cover plate 300 are fixedly installed on the shell 100, the connector 230 can form a clamping action with the cover plate 300, thereby improving the stability of the installation of the circuit board 200 on the motor. Further, the connector 230 can also be connected with external devices outside the motor, so as to realize corresponding functions, which are not particularly limited.

[0048] In summary, the above only describes the preferred embodiments of the present application, and any changes and modifications made within the scope of the present application should be included in the scope of the present application.

Claims

1. A motor temperature detection device, characterized in that: Including temperature sampling circuit and thermistor; The temperature sampling circuit is arranged on a circuit board inside the motor; The thermistor is arranged on the circuit board and is electrically connected to the temperature sampling circuit; When the circuit board is mounted on the motor, the thermistor can extend into the housing of the motor to detect the temperature of the housing.

2. The motor temperature detection device according to claim 1, characterized in that: A detection hole is provided on the housing; when the circuit board is mounted on the motor, the thermistor at least partially extends into the detection hole.

3. The motor temperature detection device according to claim 2, characterized in that: The detection hole is arranged in the shell and one end of the detection hole is opened on the shell.

4. The motor temperature detection device according to claim 2, characterized in that: A heat conducting member is provided in the detection hole and / or on the thermistor; when the circuit board is mounted on the motor, the thermistor contacts the inner side wall of the detection hole through the heat conducting member.

5. The motor temperature detection device according to claim 4, characterized in that: When the circuit board is mounted on the motor, the heat conductive member can wrap the thermistor.

6. The motor temperature detection device according to claim 4 or 5, characterized in that: The heat conducting member is thermally conductive silicone grease.

7. The motor temperature detection device according to claim 1, characterized in that: The temperature sampling circuit is electrically connected to the control circuit, the drive circuit and the power supply circuit on the circuit board.

8. A motor, characterized in that: It comprises a shell, a circuit board and a cover plate; the circuit board is fixedly mounted on the shell by bolts; the cover plate is fixedly mounted on the shell by snaps to achieve shielding of the circuit board; the shell and the circuit board are provided with the motor temperature detection device according to any one of claims 1 to 7.

9. The motor according to claim 8, characterized in that: The circuit board is provided with a connector, and the connector is used to connect the cover plate and / or external equipment.

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