Silicone oil fan type permanent magnet synchronous motor

Abstract

The utility model relates to a silicone oil fan type permanent magnet synchronous motor, which is characterized by comprising a fan shaft, a motor front end cover bearing, a motor rear end cover bearing, a rotor, a rotor front end cover, a rotor rear end cover and a silicone oil fan, the fan shaft is fixedly connected with the interior of the motor through a motor front end cover bearing and a motor rear end cover bearing; the front end of the fan shaft is connected with a coupler for transmitting motion and power; the fan shaft further penetrates through the rotor, and the rotor is fixedly connected to the rotor front end cover and the rotor rear end cover through a motor front end cover bearing and a motor rear end cover bearing. The silicone oil fan is additionally arranged at the rear end of the permanent magnet synchronous motor, the fan rotating speed at different temperatures is adjusted through the controller, the motor heat dissipation efficiency of the electric excavator can be effectively improved, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The utility model relates to a permanent magnet synchronous motor, in particular to a silicone oil fan type permanent magnet synchronous motor. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] In recent years, significant progress has been made in the batteries, motors and control systems of electric excavators, which has promoted the rapid development of electric excavators in the field of construction machinery.

[0004] At present, the radiator on the electric excavator usually uses an electronic cooling fan for heat dissipation. However, due to the complex operating conditions of existing medium-sized electric excavators, it is easy to cause damage to the electronic cooling fan, resulting in a large amount of heat accumulation, which affects the performance of the vehicle components and the vehicle. In addition, the heat dissipation process using the above method cannot automatically adjust the fan speed according to the temperature. The electric excavator needs to keep the fan running at high power all the time, resulting in a large consumption of battery power. Utility Model Content

[0005] Based on the above problems, the utility model provides a silicone oil fan type permanent magnet synchronous motor, including a fan shaft, a motor front end cover bearing, a motor rear end cover bearing, a rotor, a rotor front end cover, a rotor rear end cover and a silicone oil fan;

[0006] The fan shaft is fixedly connected to the inside of the motor through the motor front end cover bearing and the motor rear end cover bearing;

[0007] The rear end of the fan shaft is connected to a silicone oil fan, and the front end is connected to a coupling for transmitting motion and power;

[0008] The fan shaft also passes through the rotor, and the rotor is fixedly connected to the rotor front end cover and the rotor rear end cover through the motor front end cover bearing and the motor rear end cover bearing.

[0009] As a further technical solution, the fan shaft and the silicone oil fan are fixedly connected via a silicone oil fan bearing.

[0010] As a further technical solution, the silicone oil fan includes a fan housing, fan blades and a drive disk.

[0011] As a further technical solution, the fan housing contains an oil storage chamber and a coupling chamber; the oil storage chamber is arranged on the front side of the fan shaft, and the oil storage chamber is connected to the coupling chamber through the upper oil return port and the lower oil inlet port.

[0012] As a further technical solution, a controller is provided on the front side of the oil storage chamber, and a control pin is fixedly connected to the controller.

[0013] As a further technical solution, the control pin passes through the oil storage cavity and contacts the valve plate inside the oil storage cavity.

[0014] As a further technical solution, one end of the valve plate is fixed on the inner arm of the oil storage cavity, and the other end is lifted up to move inside the oil storage cavity under the action of a control pin.

[0015] As a further technical solution, an oil pipeline is provided in the coupling cavity between the driving disk and the fan housing.

[0016] As a further technical solution, the drive disc is connected to the fan shaft via a spline.

[0017] As a further technical solution, the fan blades are fixedly mounted on the outside of the fan housing for rotating to dissipate heat.

[0018] Beneficial effects of one or more of the above technical solutions:

[0019] (1) The silicone oil fan has a simple structure, good waterproof performance, is reliable and durable, and can ensure normal operation under different operating conditions of the electric excavator.

[0020] (2) The drive disk of the silicone oil fan is driven to rotate by the motor shaft, and the flow rate of the silicone oil is controlled to control the rotation speed of the silicone oil fan according to different temperatures, thereby effectively improving the heat dissipation efficiency of the motor of the electric excavator and increasing the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0022] Figure 1 It is a structural schematic diagram of the utility model.

[0023] Figure 2 2 is a diagram of wind speed and oil temperature of this embodiment.

[0024] In the figure, 1 is a rotor shaft, 2 is a motor front end cover bearing, 3 is a rotor front end cover, 4 is a rotor, 5 is a rotor rear end cover, 6 is a silicone oil fan, 7 is an oil return hole, 8 is a fan blade, 9 is a spline, 10 is a controller, 11 is a control pin, 12 is a valve plate, 13 is a fan housing, 14 is an oil inlet hole, 15 is an oil storage cavity, 16 is a drive plate, 17 is a silicone oil fan bearing, 18 is a motor rear end cover bearing, 19 is an oil pipeline, and 20 is a coupling cavity. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-2 , describing the specific implementation of this embodiment.

[0026] Reference Figure 1 An embodiment of the present application provides a silicone oil fan type permanent magnet synchronous motor, a silicone oil fan type permanent magnet synchronous motor, comprising a fan shaft 1, a motor front end cover bearing 2, a motor rear end cover bearing 18, a rotor 4, a rotor front end cover 3, a rotor rear end cover 5 and a silicone oil fan 6.

[0027] Among them, the rotor shaft of the permanent magnet synchronous motor in this embodiment is the fan shaft 1, the two are coaxially arranged, and are fixedly connected to the inside of the motor through the motor front end cover bearing 2 and the motor rear end cover bearing 18; the rear end of the fan shaft 1 is connected to the silicone oil fan 6, and the fan shaft 1 and the silicone oil fan 6 are fixedly connected through the silicone oil fan bearing 17; the front end can transmit motion and power to external working parts through a connecting coupling (not marked in the figure); the fan shaft 1 also passes through the rotor 4, and the rotor 4 is fixedly connected to the rotor front end cover 3 and the rotor rear end cover 5 through the motor front end cover bearing 2 and the motor rear end cover bearing 18.

[0028] The silicone oil fan 6 is composed of a fan housing 13, a drive disc 16 and a fan blade 8, wherein the fan shaft 1 passes through the central part of the fan housing 13, and the two are fixedly connected by a silicone oil fan bearing 17. An oil storage chamber 15 is provided inside the fan housing 13 for storing silicone oil. The oil storage chamber 15 is connected to the coupling chamber 20 through the oil inlet hole 14 and the oil return hole 7. A plurality of fine oil pipelines 19 are provided in the coupling chamber 20 for the flow of silicone oil. In addition, a controller 10 is also provided on the front side of the oil storage chamber 15, and the controller 10 can use a bimetallic temperature sensor. The controller 10 is fixedly connected with a control pin 11, and the control pin 11 abuts against the valve plate 12 inside the oil storage chamber 15. One end of the valve plate 12 is fixedly connected to the inside of the oil storage chamber 15, and the other end is in an open state. When the controller 10 controls the control pin 11 to move forward and backward, the valve plate 12 also moves forward and backward with the control pin 11, thereby controlling the opening and closing of the oil inlet 14.

[0029] The drive disk 16 is located in the coupling cavity 20. The drive disk 16 is connected to the fan shaft 1 through the spline 9. When the fan shaft 1 rotates, the drive disk 16 is driven to move in the coupling cavity. Since silicone oil is viscous, the more silicone oil there is in the oil pipeline 19, the higher the frequency of synchronous rotation between the drive disk 16 and the fan housing 13, and the higher the heat dissipation efficiency. That is, the rotation efficiency of the fan blades 8 is improved by controlling the flow rate of silicone oil, thereby further improving the heat dissipation efficiency.

[0030] Working principle:

[0031] In this embodiment, the rear end of the fan shaft 1 of the permanent magnet synchronous motor is longer, and the fan shaft 1 passes through the tail of the motor and is connected to a silicone oil fan 6. When the motor rotates to output kinetic energy to the outside, the fan shaft 1 of the motor will drive the driving disk 16 of the silicone oil fan 6 to rotate, and then the flow rate of the silicone oil is controlled to control the rotation speed of the silicone oil fan.

[0032] Furthermore, when the temperature generated during the operation of the permanent magnet synchronous motor is high, the bimetallic temperature sensor selected by the controller 10 deforms outward when it senses that the temperature is too high, thereby driving the control pin 11 to move forward. Since the control pin 11 is in contact with the valve plate 12, the valve plate 12 also moves under the drive of the control pin 11, thereby causing the oil inlet 14 to open. Under the action of centrifugal force, the silicone oil in the oil storage chamber 15 flows into the oil pipeline 19 in the coupling chamber 20, and the drive disk 16 rotates in the coupling chamber 20 under the drive of the fan shaft 1. Since the silicone oil is viscous, the more silicone oil flows into the housing, the higher the efficiency of the synchronous rotation between the fan housing 13 and the drive disk 16. The silicone oil in the coupling chamber 20 also flows back to the oil storage chamber 15 through the oil return hole 7 under the action of centrifugal force, realizing the circulation of silicone oil between the oil storage chamber 15 and the coupling chamber 20.

[0033] As the wind speed increases and the temperature decreases, the bimetallic temperature sensor gradually returns to its original state, and the control pin 11 drives the valve plate 12 to close the oil inlet hole 14. The drive disk 16 rotates under the drive of the fan shaft 1. Under the action of centrifugal force during the rotation process, the drive disk 16 squeezes the silicone oil in the coupling cavity 20 to the edge and returns to the oil storage cavity 15 through the oil return hole 7. At this time, the fan blades 8 do not rotate or rotate slowly due to bearing friction.

[0034] Figure 2 This is a relationship diagram between wind speed and oil temperature in this embodiment. It can be seen that the fan shaft 1 of the permanent magnet synchronous motor is used to drive the fan blades 8 to rotate, and the speed of the silicone oil fan is adjusted according to the temperature, which improves the utilization rate of the permanent magnet synchronous motor and the heat dissipation rate of the electric excavator.

[0035] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A silicone oil fan type permanent magnet synchronous motor, characterized in that: It includes a fan shaft, a motor front end cover bearing, a motor rear end cover bearing, a rotor, a rotor front end cover, a rotor rear end cover and a silicone oil fan; The fan shaft is fixedly connected to the inside of the motor through the motor front end cover bearing and the motor rear end cover bearing; The rear end of the fan shaft is connected to a silicone oil fan, and the front end is connected to a coupling for transmitting motion and power; The fan shaft also passes through the rotor, and the rotor is fixedly connected to the rotor front end cover and the rotor rear end cover through the motor front end cover bearing and the motor rear end cover bearing.

2. A silicone oil fan type permanent magnet synchronous motor as claimed in claim 1, characterized in that: The fan shaft and the silicone oil fan are fixedly connected via a silicone oil fan bearing.

3. A silicone oil fan type permanent magnet synchronous motor as claimed in claim 1, characterized in that: The silicone oil fan comprises a fan housing, fan blades and a drive disc.

4. A silicone oil fan type permanent magnet synchronous motor as claimed in claim 3, characterized in that: The fan housing contains an oil storage chamber and a coupling chamber; the oil storage chamber is arranged on the front side of the fan shaft, and the oil storage chamber is connected with the coupling chamber through an upper oil return port and a lower oil inlet port.

5. A silicone oil fan type permanent magnet synchronous motor as claimed in claim 4, characterized in that: A controller is arranged at the front side of the oil storage cavity, and a control pin is fixedly connected to the controller.

6. A silicone oil fan type permanent magnet synchronous motor as claimed in claim 5, characterized in that: The control pin passes through the oil storage cavity and contacts the valve plate inside the oil storage cavity.

7. A silicone oil fan type permanent magnet synchronous motor as claimed in claim 6, characterized in that: One end of the valve plate is fixed on the inner arm of the oil storage cavity, and the other end is lifted up to move inside the oil storage cavity under the action of the control pin.

8. A silicone oil fan type permanent magnet synchronous motor as claimed in claim 4, characterized in that: The coupling cavity is provided with an oil pipeline.

9. A silicone oil fan type permanent magnet synchronous motor as claimed in claim 3, characterized in that: The driving disc is connected to the fan shaft via a spline.

10. The silicone oil fan type permanent magnet synchronous motor according to claim 3, characterized in that: The fan blades are fixedly mounted on the outside of the fan housing and are used for rotating to dissipate heat.

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