Permanent magnet synchronous motor for petroleum drilling winch

Abstract

The utility model belongs to motor technical field especially is a kind of permanent magnet synchronous motor for petroleum drilling winch, including motor shell, fixedly connected on the stator of motor shell inner wall, and the rotor of bearing rotation connection at the axle center of motor shell, the output end of the rotor extends to the outside of motor shell and is connected with shaft coupling, the top of motor shell is fixedly connected with support, and cooling fan is installed on the fixed mounting table of support upper end.This utility model installs platinum thermal resistance sensor at the clearance of motor stator winding, can monitor the temperature in motor shell in real time, when temperature is too high, cooling fan is inhaled cooling gas, realizes the rapid heat dissipation of motor internal environment, when motor frost, can carry out low temperature heating and dehumidification protection by dehumidification electric heater, solve the problem that present stage motor lacks quick automatic cooling, temperature rising protection function.

Description

Technical Field

[0001] This utility model relates to the field of electric motor technology, specifically a permanent magnet synchronous motor for oil drilling rig winches. Background Technology

[0002] The permanent magnet synchronous motor for oil drilling rig winches is a high-performance motor specifically designed for winch systems in oil drilling operations. It uses permanent magnets as the rotor magnetic field source, and the stator is powered by a frequency converter to achieve precise speed and torque control. It has advantages such as high efficiency, high power density, fast response, and low maintenance, and is widely used in modern digital electric drive drilling rigs.

[0003] However, under high-intensity continuous operation conditions (such as tripping in and out of the drill), permanent magnet synchronous motors generate a large amount of heat inside. Traditional synchronous motors rely on their own fans for cooling, but this method has limited cooling effect and is difficult to match the high-intensity continuous operation of the motor. The cooling effect is not good enough, and it is very easy to generate mechanical and stray losses, leading to motor failure and affecting the performance and life of the motor. Secondly, in extremely cold regions (such as winter field operations and high-latitude oil fields), the ambient temperature may be as low as -30°C or even lower. At this time, the motor (especially the casing and stator) is prone to frost. Low-temperature preheating measures are required. However, the permanent magnet synchronous motors used in oil drilling rig winches at present do not have the function of automatic rapid cooling and low-temperature preheating. They cannot adjust the motor temperature according to the operating conditions and temperature, and the performance is not good enough. Therefore, this utility model proposes a permanent magnet synchronous motor for oil drilling rig winches to solve this problem. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a permanent magnet synchronous motor for oil drilling rig winches. By installing a platinum resistance thermometer in the gap of the motor stator winding, the temperature inside the motor casing can be monitored in real time. When the temperature is too high, cooling gas is blown in by a cooling fan to achieve rapid heat dissipation of the internal environment of the motor. When the motor frosts, a dehumidifying electric heater can be used for low-temperature heating and dehumidification protection, solving the problem that current motors lack rapid automatic cooling and heating protection functions.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0008] A permanent magnet synchronous motor for an oil drilling rig winch includes a motor housing, a stator fixedly connected to the inner wall of the motor housing, and a rotor rotatably connected to the shaft of the motor housing via bearings. The output end of the rotor extends to the outside of the motor housing and is connected to a coupling. A bracket is fixedly connected to the top of the motor housing, and a cooling fan is mounted on a mounting platform fixed to the upper end of the bracket. A cooling channel is connected between the air outlet of the cooling fan and one side of the motor housing. Cooling air enters from the non-drive end of the motor housing and exits from the drive end. An array of dehumidifying electric heaters is fixedly connected to the motor housing around the circumference of the stator.

[0009] Furthermore, a control box is fixedly connected to one side of the motor housing. The control box includes a housing fixedly connected to the side wall of the motor housing, and a circuit breaker, a PLC controller, and a terminal block installed sequentially from top to bottom inside the housing. A power interface is also provided inside the housing.

[0010] Furthermore, the PLC controller is electrically connected to the terminal block, and the power interface, PLC controller, and circuit breaker are connected in series, with the circuit breaker providing safety protection for the PLC controller; a platinum resistance thermometer is installed on the motor housing at the gap of the stator winding, and the output terminal of the platinum resistance thermometer is electrically connected to the input terminal of the PLC controller.

[0011] Furthermore, a wiring harness is connected between the terminal block and the cooling fan. The PLC controller is electrically connected to the cooling fan through the terminal block and the wiring harness to control the working status of the cooling fan. The output terminal of the PLC controller is also electrically connected to the input terminal of the dehumidifying electric heater.

[0012] Furthermore, the air inlet end of the cooling fan is fixedly connected to an air inlet hood, and a fan dust filter is installed on the air inlet of the air inlet hood. The fan dust filter includes a mounting plate and a filter screen fixedly connected to the inner side of the mounting plate. The mounting plate has an array of mounting holes, and the mounting plate is fixed to the air inlet of the air inlet hood by bolts at the mounting holes.

[0013] Furthermore, a sealing gasket is provided at the connection between the mounting plate and the air inlet shroud.

[0014] (III) Beneficial Effects

[0015] Compared with the prior art, this utility model provides a permanent magnet synchronous motor for oil drilling rig winches, which has the following advantages:

[0016] 1. This utility model uses a platinum resistance thermometer to collect temperature data at the stator winding gap in real time and transmits the signal to a PLC controller, constructing a closed-loop control system of "temperature monitoring - command output - execution adjustment". When the motor generates a large amount of heat due to high-intensity operation (such as drilling operations) and the temperature exceeds a preset threshold, the PLC controller drives the cooling fan to start. Cooling air enters from the non-drive end and exits from the drive end through the air-cooling channel, flowing fully through the motor interior along a preset path, quickly removing the heat generated by the stator and rotor operation, avoiding the reliance on built-in fans for cooling in traditional motors. This effectively reduces the risk of motor failure by mitigating mechanical and stray losses caused by limited power, ensuring the performance stability and service life of the motor under continuous high load conditions. In extremely cold environments (such as winter field operations below -30℃ and high-latitude oil fields), when frost forms on the motor casing and stator, the PLC controller can trigger the array of dehumidifying electric heaters to operate. This achieves low-temperature preheating and dehumidification protection of the motor through uniform heating in a circumferential direction, solving the drawback of traditional motors that cannot automatically adjust the temperature according to the working conditions. This adapts to the temperature requirements of various scenarios such as high and low temperatures in oil drilling operations.

[0017] 2. In this utility model, the dust filter at the air inlet of the cooling fan is connected to the air inlet cover by bolts through the array of mounting holes on the mounting plate. The inner filter screen can effectively filter dust, sand and other impurities in the air, preventing them from entering the motor with the cooling air. This avoids impurities adhering to the surface of the stator and rotor, affecting the electromagnetic conversion efficiency, or causing wear on bearings and other components. The sealing gasket between the mounting plate and the air inlet cover further enhances the sealing of the connection, playing a role in shock absorption and sealing, and preventing unfiltered air from seeping in. Attached Figure Description

[0018] Figure 1 This is a front view of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the dust filter for the blower in this utility model;

[0020] Figure 3 This is a side view of the present invention;

[0021] Figure 4 This is a schematic diagram of the internal structure of the control box in this utility model.

[0022] In the diagram: 1. Motor housing; 2. Stator; 3. Coupling; 4. Rotor; 5. Platinum resistance thermometer; 6. Bracket; 7. Mounting platform; 8. Cooling fan; 9. Air inlet hood; 10. Fan dust filter; 1001. Mounting plate; 1002. Filter screen; 1003. Sealing gasket; 1004. Mounting hole; 11. Air-cooled aisle; 12. Dehumidifying electric heater; 13. Control box; 1301. Box body; 1302. Power interface; 1303. PLC controller; 1304. Terminal block; 1305. Circuit breaker; 14. Wiring harness. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example

[0025] like Figure 1 and Figure 3 As shown in the figure, an embodiment of the present invention provides a permanent magnet synchronous motor for an oil drilling rig winch, including a motor housing 1, a stator 2 fixedly connected to the inner wall of the motor housing 1, and a rotor 4 rotatably connected to the shaft of the motor housing 1 via bearings. The output end of the rotor 4 extends to the outside of the motor housing 1 and is connected to a coupling 3. A bracket 6 is fixedly connected to the top of the motor housing 1, and a cooling fan 8 is installed on a mounting platform 7 fixed to the upper end of the bracket 6. A cooling channel 11 is connected between the air outlet of the cooling fan 8 and one side of the motor housing 1. Cooling air enters from the non-drive end of the motor housing 1 and is discharged from the drive end. Furthermore, an array of dehumidifying electric heaters 12 are fixedly connected to the motor housing 1 around the circumference of the stator 2.

[0026] It should be noted that the motor housing 1 provides a closed protective space for core components such as the stator 2 and rotor 4, preventing direct intrusion of dust and moisture from the drilling site. The top of the motor housing 1 is supported by a bracket 6 and a mounting platform 7 to form a fixed support structure for the cooling fan 8. When the cooling fan 8 is running, the cooling airflow generated is directionally delivered to the inside of the motor housing 1 through the air cooling channel 11, and the airflow follows the path of "in from the non-drive end and out from the drive end". This path design allows the cooling air to flow fully across the surface of the stator 2 and rotor 4 and the winding gaps, maximizing contact with the heat-generating components and quickly removing the heat generated during operation, avoiding problems such as insulation aging and magnet demagnetization caused by high temperatures. In extremely cold environments, the dehumidifying electric heaters 12 distributed in a circular array around the stator 2 can be started simultaneously, raising the internal temperature of the motor through uniform heating, preventing frost from forming on the housing and the windings of the stator 2, avoiding failures such as difficulty in starting and increased mechanical friction caused by low temperatures, and ensuring normal starting and operation of the motor in harsh environments at -30℃ and below.

[0027] like Figure 1 , Figure 3 and Figure 4 As shown, in some embodiments, a control box 13 is fixedly connected to one side of the motor housing 1. The control box 13 includes a housing 1301 fixedly connected to the side wall of the motor housing 1, and a circuit breaker 1305, a PLC controller 1303 and a terminal block 1304 installed from top to bottom inside the housing 1301. A power interface 1302 is also provided inside the housing 1301.

[0028] It should be noted that the PLC controller 1303 is model S7-400. The control box 13 serves as the "control center" of the motor. Its housing 1301 is fixed to the side wall of the motor casing 1. Inside the box, the circuit breaker 1305, PLC controller 1303, and terminal blocks 1304, installed from top to bottom, form a layered functional area. The power interface 1302 supplies power to the entire control box 13. After the power interface 1302 is connected to an external power source, the current first flows through the circuit breaker 1305 and then to the PLC controller 1303. The circuit breaker 1305 can monitor the circuit current in real time. When an out-of-circuit current occurs... In case of abnormal conditions such as overload (e.g., motor stall causing a sudden increase in current) or short circuit (e.g., damaged line insulation), the circuit can be quickly cut off to prevent excessive current from damaging the PLC controller 1303 and core components such as the motor stator 2 winding and rotor 4 magnets, thus playing a safety protection role. The terminal block 1304 serves as a "transfer hub" for signals and power. On the one hand, it connects to the cooling fan 8, dehumidifying electric heater 12 and other actuators. On the other hand, it interfaces with the signal output terminal of the PLC controller 1303 to achieve stable transmission of control commands, while also facilitating line inspection and replacement during later maintenance.

[0029] like Figure 1 , Figure 3 and Figure 4As shown, in some embodiments, the PLC controller 1303 is electrically connected to the terminal block 1304, and the power interface 1302, the PLC controller 1303, and the circuit breaker 1305 are connected in series. The circuit breaker 1305 provides safety protection for the PLC controller 1303. A platinum resistance thermometer 5 is installed in the gap of the stator winding 1 on the motor housing 1. The output terminal of the platinum resistance thermometer 5 is electrically connected to the input terminal of the PLC controller 1303.

[0030] It should be noted that the platinum resistance thermometer 5 is model PT100. The platinum resistance thermometer 5 is installed in the gap between the stator windings of the motor housing 1 and the motor stator 2. This location is the main heat-generating area during motor operation. The sensor can directly and accurately collect winding temperature data and transmit it to the input terminal of the PLC controller 1303 via wires. The PLC controller 1303 has built-in preset temperature thresholds (such as a high temperature threshold of 55℃ and a low temperature threshold of -5℃). After receiving the sensor signal, it calculates the current temperature value through its internal program and compares it with the threshold. If the temperature exceeds the normal range, it immediately triggers the corresponding control. Simultaneously, the PLC controller 1303 maintains an electrical connection with the terminal block 1304. The terminal block 1304 can classify and transfer the control signals output by the PLC to different execution components, ensuring the accuracy and stability of instruction transmission. The series structure of the power interface 1302, PLC controller 1303, and circuit breaker 1305 not only provides a stable power supply to the PLC controller 1303, but also prevents the PLC controller 1303 from being damaged due to abnormal power supply (such as voltage fluctuations or instantaneous impacts) through the overcurrent protection function of the circuit breaker 1305, ensuring the continuous and reliable operation of temperature monitoring and control functions.

[0031] like Figure 1 and Figure 4 As shown, in some embodiments, a wiring harness 14 is connected between the terminal block 1304 and the cooling fan 8. The PLC controller 1303 is electrically connected to the cooling fan 8 through the terminal block 1304 and the wiring harness 14 to control the working state of the cooling fan 8. The output terminal of the PLC controller 1303 is also electrically connected to the input terminal of the dehumidifying electric heater 12.

[0032] It should be noted that the operating status of both the cooling fan 8 and the dehumidifying electric heater 12 is precisely controlled by the PLC controller 1303, and a stable control circuit is constructed through the wiring harness 14 and the terminal block 1304. When the PLC controller 1303 detects that the motor temperature is higher than the preset high temperature threshold through the platinum resistance thermometer 5, it immediately sends a "start cooling fan 8" control signal to the terminal block 1304. The terminal block 1304 transmits the signal to the drive module of the cooling fan 8 through the wiring harness 14 to drive the fan to run. If the temperature continues to rise, the PLC can further output a signal to adjust the fan speed (such as increasing it to the high speed range) to enhance the heat dissipation effect. When the temperature drops to the normal range, the PLC sends a "decelerate" or "stop" command to achieve on-demand heat dissipation and reduce energy consumption. When the PLC detects that the motor temperature is lower than the preset low temperature threshold, or judges that there is a risk of frosting, it directly sends a "power on heating" command to the input terminal of the dehumidifying electric heater 12. After the heater starts, it raises the internal temperature of the motor by uniformly heating the circumference, while dispersing moisture and preventing the winding insulation layer from getting damp.

[0033] like Figure 1 and Figure 2 As shown, in some embodiments, the air inlet end of the cooling fan 8 is fixedly connected to an air inlet shroud 9, and a fan dust filter 10 is installed on the air inlet of the air inlet shroud 9. The fan dust filter 10 includes a mounting plate 1001 and a filter screen 1002 fixedly connected to the inner side of the mounting plate 1001. The mounting plate 1001 has an array of mounting holes 1004, and the mounting plate 1001 is fixed to the air inlet of the air inlet shroud 9 by bolts at the mounting holes 1004.

[0034] It should be noted that the mounting plate 1001 is fixedly connected to the air inlet hood 9 by bolts at the mounting holes 1004, ensuring that the dust filter does not loosen or shift under the impact of airflow generated by the fan. The filter screen 1002 inside the mounting plate 1001 is made of high-density metal mesh or composite filter material, which can effectively filter impurities such as drilling site dust, gravel, and rock cuttings in the air. At the same time, the bolts are quick-release bolts, and the detachable bolt connection structure facilitates later maintenance. When the filter screen 1002 becomes clogged due to long-term use, the staff can quickly unscrew the bolts and disassemble the dust filter for cleaning or replacement.

[0035] like Figure 2 As shown, in some embodiments, a sealing gasket 1003 is provided at the connection between the mounting plate 1001 and the air inlet shroud 9.

[0036] It should be noted that the sealing gasket 1003 serves as a shock absorber and protector, increases the sealing between structures, and prevents the connection from being too loose.

[0037] The working principle and usage steps of this utility model are as follows: First, the external power supply is connected to the power interface 1302 of the control box 13. The current is transmitted to the PLC controller 1303 through the circuit breaker 1305. The circuit breaker 1305 monitors the circuit in real time to ensure power supply safety. At this time, the platinum resistance thermometer 5 begins to collect the temperature of the stator 2 winding gap and transmits the initial temperature signal to the PLC controller 1303. After the PLC controller 1303 confirms that the power supply is normal and the temperature is not abnormal, the motor starts. The stator 2 is energized to generate a rotating magnetic field, which drives the rotor 4 to rotate. The rotor 4 transmits mechanical energy to the oil drilling rig winch through the coupling 3 to meet the winch operation requirements. If the temperature detected by the platinum resistance thermometer 5 is higher than the preset temperature, the circuit breaker will continue to operate. When a high temperature threshold is set (e.g., 55℃), the PLC controller 1303 starts the cooling fan 8 through the wiring terminal 1304 and wiring harness 14. The cooling air is filtered through the air inlet shroud 9 and the fan dust filter 10, and then enters the motor from the non-drive end through the air-cooling channel 11 and is discharged from the drive end for heat dissipation. If the detected temperature is lower than the preset low temperature threshold (e.g., -5℃), the PLC controller 1303 triggers the dehumidifying electric heater 12 to work, which heats and dehumidifies the inside of the motor evenly to prevent frost formation. When the filter screen 1002 of the fan dust filter 10 is clogged, the cooling fan 8 is turned off, the quick-release bolts on the mounting plate 1001 are unscrewed, the dust filter is disassembled for cleaning or the filter screen 1002 is replaced, and then it is re-secured with bolts.

[0038] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A permanent magnet synchronous motor for an oil drilling rig winch, comprising a motor housing (1), a stator (2) fixedly connected to the inner wall of the motor housing (1), and a rotor (4) rotatably connected to the shaft of the motor housing (1) via bearings, wherein the output end of the rotor (4) extends to the outside of the motor housing (1) and is connected to a coupling (3), characterized in that: A bracket (6) is fixedly connected to the top of the motor housing (1), and a cooling fan (8) is installed on the mounting platform (7) fixed at the upper end of the bracket (6). A cooling channel (11) is connected between the air outlet of the cooling fan (8) and one side of the motor housing (1). Cooling air enters from the non-drive end of the motor housing (1) and is discharged from the drive end. An array of dehumidifying electric heaters (12) is fixedly connected to the motor housing (1) around the circumference of the stator (2).

2. The permanent magnet synchronous motor for an oil drilling rig winch according to claim 1, characterized in that: A control box (13) is fixedly connected to one side of the motor housing (1). The control box (13) includes a box body (1301) fixedly connected to the side wall of the motor housing (1), and a circuit breaker (1305), a PLC controller (1303) and a terminal block (1304) installed from top to bottom inside the box body (1301). A power interface (1302) is also provided inside the box body (1301).

3. A permanent magnet synchronous motor for an oil drilling rig winch according to claim 2, characterized in that: The PLC controller (1303) is electrically connected to the terminal block (1304), and the power interface (1302), the PLC controller (1303) and the circuit breaker (1305) are connected in series. The circuit breaker (1305) provides safety protection for the PLC controller (1303). A platinum resistance thermometer (5) is installed on the motor housing (1) at the gap of the stator (2) winding. The output end of the platinum resistance thermometer (5) is electrically connected to the input end of the PLC controller (1303).

4. A permanent magnet synchronous motor for an oil drilling rig winch according to claim 3, characterized in that: A wiring harness (14) is connected between the terminal block (1304) and the cooling fan (8). The PLC controller (1303) is electrically connected to the cooling fan (8) through the terminal block (1304) and the wiring harness (14) to control the working state of the cooling fan (8). The output terminal of the PLC controller (1303) is also electrically connected to the input terminal of the dehumidifying electric heater (12).

5. A permanent magnet synchronous motor for an oil drilling rig winch according to claim 1, characterized in that: The air inlet end of the cooling fan (8) is fixedly connected to an air inlet cover (9), and a fan dust filter (10) is installed on the air inlet of the air inlet cover (9). The fan dust filter (10) includes a mounting plate (1001) and a filter screen (1002) fixedly connected to the inside of the mounting plate (1001). The mounting plate (1001) has an array of mounting holes (1004), and the mounting plate (1001) is fixed to the air inlet of the air inlet cover (9) by bolts at the mounting holes (1004).

6. A permanent magnet synchronous motor for an oil drilling rig winch according to claim 5, characterized in that: A sealing gasket (1003) is provided at the connection between the mounting plate (1001) and the air inlet hood (9).

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