A linear motor armature temperature measurement monitoring device and a linear motor comprising the same

Abstract

The utility model discloses a linear motor armature temperature measurement monitoring device and linear motor containing it, linear temperature resistance is set in the shell inner wall of motor temperature control metal pair plug connector, shielding cable connects linear temperature resistance, compensation resistance and motor servo controller, forms complete monitoring loop. Through the linear temperature resistance close to the metal pair plug connector inner wall, can accurate perception armature temperature, combines compensation resistance, effectively eliminates the measurement error because of the installation position heat dissipation, has promoted the accuracy and reliability of temperature monitoring significantly, the overall cost is lower, and the compact structure is simple to operate, does not need to carry out large -scale reconstruction to motor body, not only realizes the real -time measurement of armature temperature, still retains the traditional overheat alarm function, not only satisfies the temperature monitoring demand in daily operation, but also can trigger protection in time under extreme condition, improves the safety and stability of linear motor.

Description

Technical Field

[0001] This utility model relates to the field of motor monitoring technology, and in particular to a linear motor armature temperature measurement and monitoring device and a linear motor including the device. Background Technology

[0002] Compared to traditional rotary servo motors, linear motors eliminate the need for intermediate transmission mechanisms, allowing them to directly drive the load and achieve higher precision motion control. However, due to electromagnetic losses and friction, linear motors generate significantly more heat in their armatures than traditional servo motors during operation, which can easily lead to performance degradation or even damage.

[0003] Currently, temperature protection measures for linear motors are mostly limited to overheat alarm functions, which trigger an alarm or shutdown when the temperature exceeds a certain threshold. A technical problem is that overheat alarms are usually based on indirect inference or empirical values, failing to accurately reflect the actual temperature state of the armature. Furthermore, due to constraints such as cost control and structural compactness, most existing linear motors lack real-time temperature measurement and monitoring capabilities. This makes it difficult to achieve refined temperature management and preventative maintenance during prolonged high-load operation, thus affecting the equipment's lifespan and reliability. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides a linear motor armature temperature measurement and monitoring device and a linear motor including the same. To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general description, nor is it intended to identify key / important components or to describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simple form as a prelude to the detailed description that follows.

[0005] The present invention adopts the following technical solution:

[0006] In a first aspect, a linear motor armature temperature measurement and monitoring device is provided, comprising: a linear temperature measuring resistor and a shielded cable; the linear temperature measuring resistor is disposed on the inner wall of the housing of the motor temperature control metal connector, the shielded cable is connected to the motor servo controller to form a monitoring circuit, and the linear temperature measuring resistor is disposed on the monitoring circuit.

[0007] Furthermore, the linear motor armature temperature measurement and monitoring device further includes a compensation resistor, which is connected in series with the linear temperature measuring resistor in the monitoring circuit.

[0008] Furthermore, the monitoring circuit is provided with a first connection point and a second connection point, which are connected to the normally open contacts of the motor thermistor protection relay, so that the monitoring circuit is in a conducting state when the motor thermistor is in normal working condition.

[0009] Furthermore, the linear temperature sensing resistor is model KTY84-130.

[0010] Furthermore, the resistance of the compensation resistor is 100-150Ω.

[0011] Secondly, a linear motor is provided, including: the aforementioned linear motor armature temperature measurement and monitoring device.

[0012] Furthermore, the linear motor further includes: three motor thermistors connected in series, and a motor thermistor protection relay is disposed in the circuit formed by the three motor thermistors connected in series.

[0013] Furthermore, the motor thermistor is a PTC155.

[0014] The beneficial effects of this utility model are:

[0015] 1. By attaching the linear temperature sensing resistor tightly to the inner wall of the metal connector, the armature temperature can be accurately sensed. Combined with the compensation resistor, the measurement error caused by heat dissipation at the installation location is effectively eliminated, significantly improving the accuracy and reliability of temperature monitoring.

[0016] 2. The overall cost is low, and its structure is compact and easy to install, without the need for large-scale modification of the motor body;

[0017] 3. It not only achieves real-time measurement of armature temperature, but also retains the traditional overheat alarm function. It not only meets the temperature monitoring needs in daily operation, but also can trigger protection in time under extreme conditions, thus improving the safety and stability of the linear motor. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a linear motor armature temperature measurement and monitoring device and a linear motor including the device, according to the present invention. Detailed Implementation

[0020] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] like Figure 1 As shown, this application provides a linear motor armature temperature measurement and monitoring device, including: a linear temperature measuring resistor 100, a compensation resistor 200, and a shielded cable 300.

[0022] A linear temperature sensing resistor 100 is mounted on the inner wall of the metal connector 400 housing for motor temperature control. A shielded cable 300 is connected to the motor servo controller 500 to form a monitoring loop, with the linear temperature sensing resistor 100 integrated within this loop. The shielded cable 300 employs a four-core shielding structure, connecting the linear temperature sensing resistor 100, the compensation resistor 200, and the motor servo controller 500 to form a complete monitoring loop with excellent anti-interference capabilities.

[0023] In this application, the linear temperature sensing resistor 100 is installed in the motor temperature control metal plug-in connector 400. During installation, it is made to be in close contact with the inner wall of the outer shell of the metal hole connector. Since the outer shell of the motor body 600 and the motor temperature control metal plug-in connector 400 are both metal, they have good thermal conductivity. Therefore, the temperature of the linear motor armature can be quickly conducted to the linear temperature sensing resistor 100 that is in close contact with the outer shell of the metal connector, so as to achieve rapid temperature acquisition.

[0024] The linear temperature sensing resistor 100 is model KTY84-130. KTY84-130 is a silicon-based positive temperature coefficient thermistor with high accuracy, high stability, and near-linear temperature-resistance characteristics, making it suitable for real-time temperature monitoring.

[0025] The compensation resistor 200 and the linear temperature sensing resistor 100 are connected in series in the monitoring circuit to compensate for the problem of lower measured temperature caused by heat dissipation at the installation location. Specifically, considering the heat dissipation during the process, the measured temperature at the installation location of the linear temperature sensing resistor 100 will be lower than the actual armature temperature. Therefore, a compensation resistor 200 needs to be connected in series in the monitoring circuit to achieve temperature compensation. The compensation resistor 200 needs to be protected from the influence of ambient temperature and can be placed in the control cabinet. Its resistance value is 100-150Ω, and the specific value is set based on accumulated experience data and actual temperature measurement comparison and verification.

[0026] A first connection point 101 and a second connection point 102 are set on the monitoring circuit. These points are connected to the normally open contacts of the motor thermistor protection relay 700, ensuring the monitoring circuit is conductive when the motor thermistor is in normal operating condition. Normal operating condition means the motor thermistor does not experience armature overheating and a significant resistance jump. Therefore, under this condition, normally open contacts 13 and 14 of the motor thermistor protection relay 700 are conductive, thus activating the monitoring circuit formed by the linear temperature sensing resistor 100 and the compensation resistor 200. This allows the motor servo controller 500 to indirectly measure the temperature of the linear motor armature.

[0027] This application also provides a linear motor, including: the above-mentioned linear motor armature temperature measurement and monitoring device, and three motor thermistors 800 connected in series, with a motor thermistor protection relay 700 disposed in the circuit formed by the three motor thermistors 800 connected in series.

[0028] The thermistor for the motor is model PTC155.

[0029] Three PTC155 thermistors connected in series are non-linear and therefore can only be used for overheat alarms of motor armatures, not for armature temperature measurement and monitoring. This application provides a four-core shielded cable (300) and two types of resistors to achieve armature temperature measurement and monitoring of linear motors. This is cost-effective, feasible, and allows even economical linear motors to easily achieve armature temperature measurement and monitoring, thus benefiting production cost control.

[0030] The circuit connection relationship of this application is as follows:

[0031] The monitoring circuit consists of a linear temperature sensing resistor 100, a compensation resistor 200, a shielded cable 300, and a normally open contact of a relay. The linear temperature sensing resistor 100 and the compensation resistor 200 are connected in series; the shielded cable 300 connects the series resistor combination to the motor servo controller 500; the first connection point 101 and the second connection point 102 are respectively connected to the normally open contacts 13 and 14 of the motor thermistor protection relay 700, forming a complete circuit. In the overall structure of the linear motor, three PTC155 thermistors are connected in series to the motor thermistor protection relay 700, forming an overheat alarm circuit that works independently yet collaboratively with the monitoring circuit.

[0032] Working principle:

[0033] Under normal motor operation, the linear temperature sensing resistor 100 changes its resistance with the armature temperature. This resistance change is transmitted to the motor servo controller 500 via the shielded cable 300, thus achieving indirect measurement of the armature temperature. A compensation resistor 200 is connected in series in the monitoring circuit to compensate for temperature measurement deviations caused by the temperature sensing resistor's distance from the heat source. Its resistance value is set based on empirical data and actual calibration results, typically between 100 and 150 Ω. The normally open contacts 13 and 14 of the motor thermistor protection relay 700 remain closed under normal overheating conditions, keeping the monitoring circuit always conductive. When overheating occurs, the thermistor resistance rises sharply, triggering the relay to disconnect the monitoring circuit and simultaneously activating the alarm or shutdown protection.

[0034] This application utilizes the excellent thermal conductivity of the metal casing by attaching the KTY84-130 linear temperature sensing resistor tightly to the inner wall of the metal connector, enabling rapid and accurate sensing of armature temperature changes. Combined with a calibration mechanism using a compensation resistor, it effectively eliminates measurement errors caused by heat dissipation at the installation location, significantly improving the accuracy and reliability of temperature monitoring.

[0035] Compared to traditional, complex temperature monitoring systems, this application achieves temperature monitoring functionality using only a single linear temperature sensing resistor, a compensation resistor, and a four-core shielded cable, resulting in lower overall costs. Furthermore, its compact structure and easy installation require no major modifications to the motor itself.

[0036] This application not only achieves real-time armature temperature measurement through a linear temperature sensing resistor, but also retains the overheat alarm function of the traditional PTC155 thermistor. Working together, these two technologies meet the temperature monitoring needs of daily operation while also triggering protection promptly in extreme conditions, thus improving the safety and stability of the linear motor.

[0037] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A linear motor armature temperature measurement and monitoring device, characterized in that, include: Linear temperature sensing resistors and shielded cables; The linear temperature sensing resistor is installed on the inner wall of the outer shell of the motor temperature control metal connector. The shielded cable is connected to the motor servo controller to form a monitoring circuit, and the linear temperature sensing resistor is installed on the monitoring circuit.

2. The linear motor armature temperature measurement and monitoring device according to claim 1, characterized in that, Also includes: A compensation resistor is connected in series with the linear temperature sensing resistor in the monitoring circuit.

3. The linear motor armature temperature measurement and monitoring device according to claim 2, characterized in that, The monitoring circuit is provided with a first connection point and a second connection point. The first connection point and the second connection point are connected to the normally open contact of the motor thermistor protection relay so that the monitoring circuit is in a conducting state when the motor thermistor is in normal working condition.

4. The linear motor armature temperature measurement and monitoring device according to claim 3, characterized in that, The linear temperature measuring resistor is model KTY84-130.

5. The linear motor armature temperature measurement and monitoring device according to claim 4, characterized in that, The resistance of the compensation resistor is 100-150Ω.

6. A linear motor, characterized in that, include: A linear motor armature temperature measurement and monitoring device as described in claim 5.

7. A linear motor according to claim 6, characterized in that, Also includes: Three motor thermistors connected in series are connected in a circuit, and a motor thermistor protection relay is installed in the circuit formed by the three motor thermistors connected in series.

8. A linear motor according to claim 7, characterized in that, The thermistor used in the motor is a PTC155.

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