Motor rotor winding temperature measurement structure

Abstract

A motor rotor winding temperature measuring structure comprises infrared thermometers and temperature sensing sheets in one-to-one correspondence with the infrared thermometers, and is characterized in that the infrared thermometers are fixed on a motor base, and the temperature sensing sheets are clamped between an upper winding and a lower winding of a rotor winding and extend into a rotor ventilating duct; and infrared rays emitted by the infrared thermometer enter the rotor ventilating duct radially aligned with the stator ventilating duct from the stator ventilating duct and fall on the temperature sensing sheet. According to the utility model, signals are transmitted from a rotating part to a static part, periodic measurement of the temperature of the rotor winding at the same position is formed, the infrared measuring instrument and the temperature sensing sheet are reliable in positioning and high in shock resistance, infrared detection is not influenced by a strong magnetic field formed between the rotor and the stator, the temperature of the rotor winding can be reliably measured, and the reliability of measurement is improved. Reliable data are provided for evaluating the temperature rise of the rotor winding.

Description

Technical Field

[0001] The utility model relates to a motor rotor winding temperature measurement structure, belonging to the technical field of rotor winding temperature measurement. Background Art

[0002] Since the rotor in the motor rotates, its temperature measurement is much more difficult than the stator. With the development of modern science and technology, different motor rotor temperature measurement methods suitable for various measurement requirements continue to emerge. The current methods for measuring rotor temperature are:

[0003] ①Measure the average temperature of the rotor winding using the copper resistance-temperature characteristic formula:

[0004] R 2 =R 1 (235+t 2 ) / (235+t 1 )

[0005] The resistance value R of the rotor winding can be measured to infer the average temperature t of the rotor winding. The resistance value R of the rotor winding can be calculated by measuring the voltage and current of the winding. 1 The measured winding resistance R 1 , then if a certain high temperature t is measured 2 The resistance value R 2 , then the temperature t at this resistance value can be calculated 2 .

[0006] ② In motor testing, it is often necessary to understand the temperature distribution of relevant parts of the rotor winding. Therefore, it is necessary to bury temperature measuring elements in the parts to be tested and lead the measurement signal from the rotating part. The commonly used methods are slip ring lead-out and wireless lead-out.

[0007] ③Infrared temperature measuring instrument

[0008] As long as the temperature of the surface of an object is above absolute zero, there will be thermal radiation, which is a kind of electromagnetic wave. The Stefan-Boltzmann law gives the relationship between the radiated energy density and the absolute temperature:

[0009] W=εσT 4

[0010] W- total radiation power, (W / cm 2 )

[0011] σ - Stefan-Boltzmann constant, ε = 5.6697 × 10 -12 W / cm 2 K 4

[0012] T-absolute temperature of the surface of the object (K)

[0013] ε-radiance, ideal emitter ε = 1

[0014] According to this principle, if the emissivity of the object is known, the surface temperature of the object can be obtained from the measured radiation power. Generally, a thermopile composed of multiple thermocouples connected in series is used to measure the radiation power. This type of meter is called an infrared temperature measuring instrument.

[0015] The above-mentioned measurement methods all have their limitations. The resistance method for measuring the average temperature of the rotor cannot measure the temperature of a specific position. The temperature measuring element is buried in the rotor to be measured, and the signal is led out by the slip ring, which puts high demands on the design and manufacture of the slip ring. The method of wirelessly leading out the signal must add complex power supply equipment and control equipment to the rotor. The infrared temperature measuring instruments currently used all measure the surface temperature of objects. In addition, these devices must withstand high vibration intensity and strong magnetic fields. The measurement results and accuracy need to be studied.

[0016] In summary, the difficulties in rotor temperature measurement mainly focus on the transmission of signals from rotating parts to stationary parts, maintaining sufficient measurement accuracy under strong magnetic fields, and having high vibration resistance. Utility Model Content

[0017] The motor rotor winding temperature measurement structure provided by the utility model realizes the transmission of signals from the rotating parts to the stationary parts, forms a periodic measurement of the rotor winding temperature at the same position, the infrared measuring instrument and the temperature sensing sheet are reliably positioned, and have high shock resistance, and the infrared detection is not affected by the strong magnetic field formed between the rotor and the stator, so the rotor winding temperature can be reliably measured, thereby providing reliable data for evaluating the temperature rise of the rotor winding.

[0018] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0019] The motor rotor winding temperature measurement structure includes an infrared thermometer and a temperature sensing piece corresponding to the infrared thermometer, and is characterized in that: the infrared thermometer is fixed on the motor base, the temperature sensing piece is clamped between the upper winding and the lower winding of the rotor winding and extends into the rotor ventilation duct, and the infrared rays emitted by the infrared thermometer enter from the stator ventilation duct into the rotor ventilation duct radially aligned with the stator ventilation duct and fall on the temperature sensing piece.

[0020] Preferably, the stator ventilation duct is formed by axially adjacent stator cores and ventilation slots arranged between the axially adjacent stator cores, the rotor channel wind is formed by axially adjacent rotor cores and ventilation slots arranged between the axially adjacent rotor cores, a threaded hole radially aligned with the stator ventilation duct is provided on the motor base, an infrared thermometer is assembled in the threaded hole, and a temperature measuring probe of the infrared thermometer extends out of the threaded hole.

[0021] Preferably, an interlayer gasket is sandwiched between the upper layer winding and the lower layer winding, and the temperature sensing piece is arranged between adjacent interlayer gaskets.

[0022] Preferably, the temperature sensing plates are evenly spaced along the circumference and axial directions of the rotor winding.

[0023] Preferably, the temperature sensing piece is made of ceramic material.

[0024] The beneficial effects of the utility model are:

[0025] The utility model discloses a motor rotor winding temperature measuring structure, in which an infrared side thermometer is installed on a motor base, a temperature sensing piece is sandwiched between an upper winding and a lower winding of a rotor winding and extends into a rotor ventilation duct, and rotates and heats up synchronously with the rotor winding, and a ventilation duct formed by a stator core and a rotor core is used as an infrared detection channel, and when infrared rays fall on the temperature sensing piece, the rotor winding temperature at the position of the temperature sensing piece is measured, and a temperature sensing piece with high thermal conductivity is closer to the rotor winding temperature, so that the measurement accuracy is ensured, and the infrared thermometer is installed on the motor The machine base remains motionless, and the temperature sensing piece rotates synchronously with the rotor winding. When the infrared rays emitted by the infrared thermometer are radially aligned with the rotor ventilation duct, the infrared rays will fall on the temperature sensing piece, realizing the transmission of the signal from the rotating part to the stationary part, forming a periodic measurement of the rotor winding temperature at the same position. The infrared measuring instrument and the temperature sensing piece are reliably positioned and have high shock resistance. The infrared detection is not affected by the strong magnetic field formed between the rotor and the stator, and the rotor winding temperature can be reliably measured, providing reliable data for evaluating the temperature rise of the rotor winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the motor rotor winding temperature measurement structure of the utility model.

[0027] Figure 2 This is a schematic diagram of the decomposition of the motor rotor winding temperature measurement structure.

[0028] Figure 3 for Figure 2 A partial enlarged schematic diagram of . DETAILED DESCRIPTION

[0029] Combine the following Figures 1 to 3 The embodiments of the utility model are described in detail.

[0030] The motor rotor winding temperature measurement structure includes an infrared thermometer 1 and a temperature sensing piece 2 corresponding to the infrared thermometer 1, and is characterized in that: the infrared thermometer 1 is fixed on the motor base 3, the temperature sensing piece 2 is clamped between the upper winding 41 and the lower winding 42 of the rotor winding 4 and extends into the rotor ventilation duct 5, and the infrared light A emitted by the infrared thermometer 1 enters from the stator ventilation duct 6 into the rotor ventilation duct 5 radially aligned with the stator ventilation duct 6 and falls on the temperature sensing piece 2.

[0031] The motor rotor winding temperature measurement structure described above is as follows: an infrared side thermometer 1 is installed on a motor base 3; a temperature sensing piece 1 is sandwiched between an upper winding 41 and a lower winding 42 of a rotor winding 4 and extends into a rotor ventilation duct 5; the temperature sensing piece 1 rotates and heats up synchronously with the rotor winding 4; a ventilation duct formed by a stator core and a rotor core is used as an infrared detection channel; when infrared rays fall on the temperature sensing piece 2, the rotor winding temperature at the location of the temperature sensing piece 2 is measured; a temperature sensing piece with high thermal conductivity is closer to the rotor winding temperature, thereby ensuring the measurement accuracy; the infrared thermometer 1 is The motor base 3 remains motionless, the temperature sensing piece 2 rotates synchronously with the rotor winding 4, and when the infrared ray A emitted by the infrared thermometer 1 is radially aligned with the rotor ventilation duct, the infrared ray will fall on the temperature sensing piece 2, realizing the transmission of the signal from the rotating part to the stationary part, forming a periodic measurement of the rotor winding temperature at the same position. The infrared measuring instrument 1 and the temperature sensing piece 2 are reliably positioned and have high shock resistance. The infrared detection is not affected by the strong magnetic field formed between the rotor and the stator, and the rotor winding temperature can be reliably measured, thereby providing reliable data for evaluating the temperature rise of the rotor winding.

[0032] Among them, the stator ventilation duct 6 is formed by axially adjacent stator cores 7 and ventilation slots 8 arranged between the axially adjacent stator cores 7, the rotor channel 5 is formed by axially adjacent rotor cores 9 and ventilation slots 8 arranged between the axially adjacent rotor cores 9, and a threaded hole 31 radially aligned with the stator ventilation duct is provided on the motor base 3, the infrared thermometer 1 is assembled in the threaded hole 31, and the temperature measuring probe of the infrared thermometer 1 extends out of the threaded hole. The infrared thermometer is threadedly mounted on the threaded hole 31, and the measuring probe extends out of the threaded hole 31. After the infrared thermometer is installed in place, the infrared rays emitted by it are radially aligned with the stator ventilation duct 6. When the rotor ventilation duct 5 where the temperature-sensing piece 2 is located rotates to be radially aligned with the stator channel 6 facing the infrared thermometer 1, the infrared rays A enter the rotor ventilation duct 5 from the stator channel 6 and fall on the temperature-sensing piece 2 to measure the temperature of the temperature-sensing piece 2. The stator ventilation duct 6 and the rotor ventilation duct 5 are heat dissipation ventilation ducts formed on the stator and the rotor. The infrared measuring instrument 1 uses the stator ventilation duct 6 and the rotor ventilation duct 5 as detection channels to ensure that the infrared rays can fall on the temperature-sensing piece 2 when the stator ventilation duct 6 and the rotor ventilation duct 5 are radially aligned.

[0033] Among them, an interlayer gasket 43 is sandwiched between the upper winding 41 and the lower winding 42, and the temperature sensing piece 2 is arranged between adjacent interlayer gaskets 43. The temperature sensing piece 2 is surrounded and positioned by the upper winding 41, the upper winding 42 and the adjacent interlayer gasket 43, and has high positioning reliability, and will not move relative to the rotor winding 4, ensuring that when the stator channel wind 6 facing the infrared measuring instrument 1 is radially aligned with the rotor ventilation duct 5 where the temperature sensing piece 2 is located, the infrared rays will fall on the temperature sensing piece 2, thereby improving the temperature measurement reliability.

[0034] The temperature sensing pieces 2 are evenly spaced along the circumference and axial direction of the rotor winding 4. A plurality of temperature measuring points are formed on the rotor winding 4 and each temperature measuring point is periodically measured.

[0035] Preferably, the temperature sensing piece 2 is made of ceramic material, which is an insulating and highly thermally conductive material with high temperature sensing reliability.

[0036] The above is a complete description of the technical solutions of the embodiments of the utility model in combination with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

Claims

1. A motor rotor winding temperature measurement structure, comprising an infrared thermometer and a temperature sensing sheet corresponding to the infrared thermometer, characterized in that: The infrared thermometer is fixed on the motor base, the temperature sensing piece is sandwiched between the upper winding and the lower winding of the rotor winding and extends into the rotor ventilation duct, and the infrared rays emitted by the infrared thermometer enter from the stator ventilation duct into the rotor ventilation duct radially aligned with the stator ventilation duct and fall on the temperature sensing piece.

2. The motor rotor winding temperature measurement structure according to claim 1, characterized in that: The stator ventilation duct is formed by axially adjacent stator cores and ventilation slots arranged between the axially adjacent stator cores, and the rotor channel wind is formed by axially adjacent rotor cores and ventilation slots arranged between the axially adjacent rotor cores. A threaded hole radially aligned with the stator ventilation duct is provided on the motor base, an infrared thermometer is assembled in the threaded hole, and a temperature measuring probe of the infrared thermometer extends out of the threaded hole.

3. The motor rotor winding temperature measurement structure according to claim 1, characterized in that: An interlayer gasket is sandwiched between the upper layer winding and the lower layer winding, and the temperature sensing piece is arranged between adjacent interlayer gaskets.

4. The motor rotor winding temperature measurement structure according to claim 1, characterized in that: The temperature sensing sheets are evenly spaced along the circumferential and axial directions of the rotor winding.

5. The motor rotor winding temperature measurement structure according to claim 1, characterized in that: The temperature sensing piece is made of ceramic material.

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