Wireless temperature measurement structure of doubly-fed motor rotor

Abstract

The utility model discloses a doubly-fed motor rotor wireless temperature measurement structure, which comprises a rotating shaft and a rotor synchronously rotating with the rotating shaft, a non-driving end of the rotating shaft is connected with a small shaft, one end of the small shaft is detachably connected with the rotating shaft, the other end of the small shaft is connected with an encoder, PT100 is embedded in a rotor groove of the rotor or a bevel edge gap at the end part of the rotor, and the PT100 is connected with the encoder. The PT100 is connected with a lead, a threading channel is arranged in the non-driving end of the rotating shaft, the rotating shaft is provided with a shaft hole for the lead to penetrate into the threading channel, the small shaft is connected with a disc, the disc is provided with a plurality of wireless signal transmitting devices, and the lead penetrates out of the end of the rotating shaft and then is connected with the wireless signal transmitting devices. According to the utility model, the signal transmission problem caused by a rotating part can be avoided, and the real-time and accurate monitoring of the temperature of the rotor is realized.

Description

Technical Field

[0001] This utility model relates to the field of motor rotors, and in particular to a wireless temperature measurement structure for a doubly fed motor rotor. Background Technology

[0002] Doubly-fed induction generators (DFIGs) are widely used in wind power generation and are a core component of variable-speed constant-frequency wind turbines, crucial for the stable operation of wind power systems. With the increasing global demand for clean energy and the expanding scale of wind power generation, the requirements for the operational reliability and performance monitoring of DFIGs are also rising. Rotor temperature is one of the key parameters reflecting the operating status of a DFIG. Excessively high temperatures can accelerate the aging of internal insulation materials, increase winding resistance, reduce motor efficiency and lifespan, and may even lead to motor failures and safety accidents. Therefore, rotor temperature measurement is necessary during the motor design and development phase. The rotor of a DFIG rotates at high speed. Traditional wired temperature measurement methods require devices such as slip rings to transmit the temperature signal from the rotating rotor to the stationary measurement system. This method has many problems, such as slip ring wear, poor contact, and unstable temperature signal transmission.

[0003] Patent application number "202310313629.0" discloses "a rotor contact temperature measuring device and temperature measuring method for a horizontal hydro turbine generator set". Utility Model Content

[0004] The purpose of this invention is to provide a wireless temperature measurement structure for a doubly fed motor rotor.

[0005] The innovation of this invention lies in its ability to avoid signal transmission problems caused by rotating components, thereby enabling real-time and accurate monitoring of rotor temperature.

[0006] To achieve the aforementioned objectives, the technical solution of this utility model is as follows:

[0007] A wireless temperature measurement structure for a doubly fed motor rotor includes a rotating shaft and a rotor that rotates synchronously with the rotating shaft. A small shaft is connected to the non-driving end of the rotating shaft. One end of the small shaft is detachably connected to the rotating shaft, and the other end is connected to an encoder. A PT100 is embedded in the rotor slot or the inclined gap at the end of the rotor. A lead wire is connected to the PT100. A wire-passing channel is provided in the non-driving end of the rotating shaft. The rotating shaft has a shaft hole for the lead wire to pass through the wire-passing channel. A disk is connected to the small shaft. Several wireless signal transmitters are provided on the disk. The lead wire passes through the end of the rotating shaft and is connected to the wireless signal transmitter.

[0008] Furthermore, the disc is detachably connected to the small shaft, facilitating the replacement of discs of different sizes.

[0009] Furthermore, the small shaft has a threaded section, and the disc has a threaded hole. The disc is screwed onto the threaded section of the small shaft through the threaded hole, and the disc is limited on both sides by nuts screwed onto the threaded section of the small shaft. Disassembly and installation are convenient.

[0010] Furthermore, the wireless signal transmitting device is detachably connected to the disk via a fixed bracket.

[0011] Furthermore, the wireless signal transmitting devices are evenly arranged along the circumference of the disk. This even arrangement prevents significant jitter when the shaft rotates.

[0012] Furthermore, the small shaft is made of stainless steel, making it even stronger.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model can avoid signal transmission problems caused by rotating parts, and realize real-time and accurate monitoring of rotor temperature.

[0015] 2. This utility model is easy to install and convenient for remote monitoring. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a magnified view of the small axis.

[0018] Figure 3 This is a cross-sectional view of Example 1. Detailed Implementation

[0019] The technical solutions in the embodiments of this utility model will now be clearly and completely described with reference to the accompanying drawings.

[0020] Example 1: A wireless temperature measurement structure for a doubly fed motor rotor includes a rotating shaft 1 and a rotor 2 that rotates synchronously with the rotating shaft 1. A small shaft 3 is connected to the non-driving end of the rotating shaft 1. The small shaft 3 is made of stainless steel.

[0021] One end of the small shaft 3 is detachably connected to the rotating shaft 1, and the other end is connected to an encoder 4. A PT1005 is embedded in the oblique gap at the rotor end of the rotor 2, and a lead wire 6 is connected to the PT1005. A wire-passing channel 7 is provided in the non-drive end of the rotating shaft 1, and a shaft hole 1.1 is provided on the rotating shaft 1 for the lead wire 6 to pass through the wire-passing channel 7. A disc 8 is connected to the small shaft 3 and is detachably connected to the small shaft 3. The small shaft 3 has a threaded section 3.1, and the disc 8 has a threaded hole 8.1. The disc 8 is screwed onto the threaded section 3.1 of the small shaft 3 through the threaded hole 8.1. The disc 8 is limited on both sides by nuts 11 screwed onto the threaded section 3.1 of the small shaft. Several wireless signal transmitters 9 are provided on the disc 8. The lead wire 6 passes through the end of the rotating shaft 1 and is connected to the wireless signal transmitter 9. The wireless signal transmitter 9 is detachably connected to the disc 8 through a fixing bracket 10. The wireless signal transmitters 9 are evenly arranged along the circumference of the disc 8.

[0022] Example 2: Referring to Example 1, PT1005 is embedded in the rotor slot.

[0023] During operation: the rotor 2, small shaft 3, disc 8, and wireless signal transmitter 9 all rotate together with the rotating shaft 1, so there are no slip rings or other components, and there is no friction.

[0024] 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 inventive effort are within the scope of protection of this utility model.

Claims

1. A wireless temperature measurement structure for a doubly-fed induction generator rotor, comprising a rotating shaft and a rotor rotating synchronously with the rotating shaft, wherein a small shaft is connected to the non-driving end of the rotating shaft, one end of the small shaft is detachably connected to the rotating shaft, and the other end is connected to an encoder, characterized in that, A PT100 is embedded in the rotor slot or the oblique gap at the rotor end of the rotor. A lead wire is connected to the PT100. A wire-passing channel is provided in the non-drive end of the rotating shaft. The rotating shaft is provided with a shaft hole for the lead wire to pass through the wire-passing channel. A disc is connected to the small shaft. Several wireless signal transmitting devices are provided on the disc. The lead wire passes out from the end of the rotating shaft and is connected to the wireless signal transmitting device.

2. The wireless temperature measurement structure for a doubly-fed motor rotor according to claim 1, characterized in that, The disk is detachably connected to the small shaft.

3. The wireless temperature measurement structure for a doubly-fed motor rotor according to claim 1, characterized in that, The small shaft has a threaded section, and the disc has a threaded hole. The disc is screwed onto the threaded section of the small shaft through the threaded hole, and the disc is limited on both sides by nuts screwed onto the threaded section of the small shaft.

4. The wireless temperature measurement structure for a doubly-fed motor rotor according to claim 1, characterized in that, The wireless signal transmitter is detachably connected to the disk via a fixed bracket.

5. The wireless temperature measurement structure for a doubly-fed motor rotor according to claim 1, characterized in that, The wireless signal transmitting devices are evenly arranged along the circumference of the disk.

6. The wireless temperature measurement structure for a doubly-fed motor rotor according to claim 1, characterized in that, The small shaft is made of stainless steel.

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