CN211266699U - Motor temperature monitoring device and electric tool - Google Patents
Motor temperature monitoring device and electric tool Download PDFInfo
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- CN211266699U CN211266699U CN201921522397.5U CN201921522397U CN211266699U CN 211266699 U CN211266699 U CN 211266699U CN 201921522397 U CN201921522397 U CN 201921522397U CN 211266699 U CN211266699 U CN 211266699U
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- motor
- temperature sensor
- temperature
- monitoring device
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Abstract
The utility model provides a motor temperature monitoring device and electric tool places temperature sensor in the wire-wound gap of motor stator, hugs closely and fixes with the wire winding, temperature sensor passes through glue and consolidates, and temperature sensor and a divider resistance establish ties between low voltage power supply positive and negative pole, and divider resistance is close to the power anodal, and temperature sensor is close to the power negative pole, and draws forth a lead wire between temperature sensor and divider resistance and insert the pin of the ADC analog-to-digital conversion module of singlechip for the temperature signal line, establishes ties a current-limiting resistor in the temperature signal line in order to protect the singlechip. The utility model discloses a set up temperature sensor real-time supervision motor temperature on the motor, effectual protection motor improves motor life.
Description
Technical Field
The utility model relates to a temperature monitoring technical field especially relates to a motor temperature monitoring device and electric tool.
Background
The motor can produce a large amount of heats at the during operation, when the temperature of motor exceeded the insulation grade limit value of motor, will produce very big harm to two most important subassembly wire winding coils in the motor and magnet, and motor high temperature will lead to wire winding coil's insulating varnish to age aggravation in the motor, burns wire winding coil even, and motor high temperature still can lead to the magnet demagnetization in the motor for motor running speed accelerates but torsion sharply drops.
However, few manufacturers monitor motor temperature, whether brushed or brushless.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the problem of carrying out the control to motor temperature, provided a motor temperature monitoring device and electric tool, realize the real-time control to motor temperature, protect the motor effectively and improve motor life.
In order to achieve the above object, the technical solution of the present invention is specifically realized as follows:
the utility model discloses a motor temperature monitoring device, a gap is formed between two adjacent motor stator windings, a temperature sensor is placed in the gap of the motor stator windings, so that the temperature sensor is clung to and fixed with the motor stator windings, and the temperature sensor is bonded on one side of the motor stator windings through glue; the temperature sensor and a divider resistor are connected in series between the anode and the cathode of a low-voltage power supply, the divider resistor is close to the anode of the power supply, the temperature sensor is close to the cathode of the power supply, a pin of an ADC (analog-to-digital converter) module of a lead connection singlechip is led out between the temperature sensor and the divider resistor, and the lead is arranged close to a wiring harness of a motor.
Furthermore, the lead is connected with a pin of an ADC (analog to digital converter) module of the singlechip through a current-limiting resistor.
The utility model discloses an on the other hand still discloses one kind and contains motor temperature monitoring device's electric tool.
The beneficial technical effects are as follows:
the utility model provides a motor temperature monitoring device and an electric tool has solved the problem of motor temperature control, through controlling the motor operation situation at the control motor temperature, thereby protects the motor effectively and improves motor life and reduce the material consumption cost for motor use unit, reduces because the danger that the equipment harm causes, protective apparatus user's life safety.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of an installation structure of a temperature sensor according to an embodiment of the present invention;
fig. 2 is a schematic view of a lead connection structure of a motor temperature monitoring device according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a motor temperature monitoring device according to an embodiment of the present invention.
Wherein, 1 is a temperature sensor, and 2 is a lead.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
An aspect of the present invention provides a motor temperature monitoring device, see fig. 1, specifically, place temperature sensor 1 in the wire-wound gap of motor stator, make temperature sensor 1 and motor stator wire winding hug closely and fix, preferably, this embodiment adopts high temperature resistant glue to consolidate, and temperature sensor 1 is a thermistor that the resistance descends along with the temperature rise substantially, and temperature sensor 1 of this embodiment includes but is not limited to NTC temperature sensor and PTC temperature sensor.
Specifically, referring to fig. 2 and fig. 3, the temperature sensor 1 and a voltage dividing resistor R1 are connected in series between the positive electrode and the negative electrode of the low-voltage power supply, the voltage dividing resistor R1 is close to the positive electrode of the power supply, the temperature sensor 1 is close to the negative electrode of the power supply, a lead 2 is led out between the temperature sensor 1 and the voltage dividing resistor R1, the lead 2 is configured as a temperature signal line, and the temperature signal line is connected with a pin of an ADC analog-to-digital conversion module of the single chip microcomputer through a current limiting resistor R2.
The utility model discloses a preferred embodiment's theory of operation does:
the temperature sensor 1 is a thermistor with the resistance value decreasing along with the temperature rising, the resistance value of the temperature sensor 1 corresponding to the temperature limit can be obtained by looking up a table, the voltage which is obtained by the lead wire 2, namely the temperature signal wire at the temperature is obtained after the voltage is divided by the divider resistor R1, the voltage is converted into a digital quantity which can be calculated and compared by a singlechip through an ADC (analog-to-digital converter) module of the singlechip, and the voltage value of the digital quantity is compared with the temperature protection reference voltage. The temperature protection reference voltage is the highest voltage which passes the endurance test and can be stably operated for a long time by the motor measured at different temperatures, and in order to ensure the use safety of equipment, the temperature protection reference voltage can be properly reduced according to actual requirements in actual application.
In the actual work of the motor, the obtained actual voltage is different along with the rise of the temperature, and according to the characteristic that the resistance value of the temperature sensor 1 is reduced along with the rise of the temperature, the higher the temperature is, the smaller the voltage value obtained by the singlechip is, therefore, when the obtained voltage value is higher than the temperature protection reference voltage, the motor normally runs; when the obtained voltage value is smaller than the temperature protection reference voltage, the single chip microcomputer sends an overheating signal, for example, the single chip microcomputer gives an alarm through an audible and visual alarm, and the single chip microcomputer can also directly control the motor to stop rotating.
According to the utility model discloses an embodiment, supposing that R1 is 2.2k omega, when the temperature reaches 200 degrees (supposing that the extreme temperature of motor work), the resistance that can obtain corresponding temperature sensing line when looking up the table is 574 omega, and in this bleeder circuit, the voltage that ADC analog-to-digital conversion module gathered should be 1.26V, when voltage is higher than 1.26V promptly, the motor can normal operating, when voltage is less than 1.26V, the singlechip sends overheat signal or direct control motor stall.
The utility model discloses on the other hand still provides an electric tool who contains above-mentioned temperature monitoring device, owing to adopt above-mentioned temperature monitoring device, the electric tool of this embodiment can in time monitor overheated operating condition, prevents that electric tool from working under overheated operating condition for a long time and causing the motor damage.
The above embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and various modifications and improvements made by the technical solutions of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (3)
1. A motor temperature monitoring device is characterized in that a gap is formed between two adjacent motor stator windings, a temperature sensor (1) is placed in the gap of the motor stator windings, the temperature sensor (1) is tightly attached to and fixed with the motor stator windings, and the temperature sensor (1) is bonded to one side of the motor stator windings through glue; the temperature sensor (1) and a divider resistor are connected in series between the anode and the cathode of a low-voltage power supply, the divider resistor is close to the anode of the power supply, the temperature sensor (1) is close to the cathode of the power supply, a pin of an ADC (analog-to-digital converter) module of a lead connection singlechip is led out between the temperature sensor (1) and the divider resistor, and a lead (2) is arranged close to a wiring harness of a motor.
2. The motor temperature monitoring device according to claim 1, wherein the lead (2) is connected with a pin of an ADC (analog-to-digital converter) module of the singlechip through a current-limiting resistor.
3. An electric power tool comprising the motor temperature monitoring device according to any one of claims 1 to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921522397.5U CN211266699U (en) | 2019-09-12 | 2019-09-12 | Motor temperature monitoring device and electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921522397.5U CN211266699U (en) | 2019-09-12 | 2019-09-12 | Motor temperature monitoring device and electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211266699U true CN211266699U (en) | 2020-08-14 |
Family
ID=71961450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921522397.5U Active CN211266699U (en) | 2019-09-12 | 2019-09-12 | Motor temperature monitoring device and electric tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211266699U (en) |
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2019
- 2019-09-12 CN CN201921522397.5U patent/CN211266699U/en active Active
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