JPH09133586A - Motor temperature measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the temperature of a rotator during the operation of a motor in real time with high accuracy. SOLUTION: A transmitter 18 converts voltage signals Sva, Svb corresponding to the temperature of magnet and shaft of a motor, measured by means of temperature sensors 12a, 12b, into frequency signals Sfa, Sfb which are then mixed to produce one frequency signal Sf. The transmitter 18 then transmits a signal Sfm subjected to FM modulation by the frequency signal Sf. A receiver 24 receives and demodulates the modulation signal Sfm to produce the frequency signal Sf which is then separated into two frequency signals Sfa, Sfb. The two frequency signals Sfa, Sfb are converted reversely into voltage signals Sva, Svb and outputted to a data logger 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature measuring device for measuring the temperature of a rotating body of a motor.

[0002]

Conventionally, when measuring the temperature of, for example, a magnet of a rotor that is a rotating body of a motor, a measurement seal that changes its color depending on the temperature is attached to the rotor magnet to operate the motor. After that, the motor was stopped, and the discolored state of the measurement seal was measured by looking through a cooling hole or the like provided in the motor housing.

However, in such a measurement, it is only possible to know what the maximum temperature was during the operation of the motor after the operation of the motor was stopped, and the temperature during the operation of the motor was measured in real time. I couldn't. Moreover, since the resolution of the temperature measurement of the measurement seal is only about 5 ° C., it is not possible to perform accurate temperature measurement. Further, the measurement seal can be used only once, and in addition, when the cooling fan is attached to the shaft of the motor, it is not easy to see the measurement seal afterwards, which is extremely inconvenient.

[0004] The present invention is to solve the above problems,
An object of the invention is to provide a motor temperature measuring device that can measure the temperature of a rotating body during operation of a motor in real time with high accuracy.

[0005]

In order to achieve the above object, a motor temperature measuring device according to claim 1 uses temperature measuring means for measuring the temperature of a rotating body of a motor and a temperature signal measured by the temperature measuring means. In response to the modulation, the carrier signal is modulated to output a modulated signal, and the modulated signal output by the modulating means is transmitted as an air propagation signal. An apparatus, a receiving device configured to receive an airborne signal and output a modulated signal, and a receiving device configured to include a demodulating unit that demodulates a measured temperature signal from the modulated signal output by the receiving unit. It is characterized by.

According to a second aspect of the present invention, there is provided a motor temperature measuring device which measures a temperature of a rotating body of a motor and outputs a voltage signal in which a voltage is changed according to the measured temperature, and a plurality of temperature measuring means. A plurality of signal converting means for converting the voltage signal output by the above into a frequency signal whose frequency is changed according to the voltage level, and the frequency signals converted by the plurality of signal converting means are mixed into one frequency signal. Signal mixing means, modulation means for FM-modulating a carrier signal by the frequency signal mixed by the signal mixing means to output a modulated signal, and transmission for transmitting the modulated signal output by the modulating means as an airborne signal And a receiving device for receiving a propagating signal in the air and outputting a modulated signal, and a receiving device for outputting the modulated signal. Demodulation means for demodulating the modulated signal into a frequency signal, separation means for separating the frequency signal demodulated by the demodulation means into a plurality of frequency signals, and a plurality of frequency signals separated by the separation means And a receiving device including a plurality of signal inversion means for inversely converting the voltage signal into a voltage signal having a changed value.

In this case, the transmitter is constructed by mounting it on two circuit boards, and these circuit boards are mounted and fixed on the shaft of the motor so as to be sandwiched from both sides of the circuit board. It may be included (claim 3). Further, the transmitter may be configured such that fins for cooling the rotating body are attached to the circuit board (claim 4).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. Referring to FIG. 4 showing the structure of a rotating body of a motor, a rotor 2 that is a rotating body of the motor 1 includes a shaft 3, a cylindrical core 4 whose center is fixed to the shaft 3, and a magnet 5 arranged on an outer peripheral portion thereof. The left and right ends of the shaft 3 are rotatably supported by a housing (not shown) via bearings 6a and 6b.

A disc-shaped circuit board 7 is attached and fixed to the shaft 3 between the bearing 6a on the left end side of the shaft 3 and the magnet 5. As shown in FIG. 2, the circuit board 7 is composed of circuit boards 7a and 7b in which a disk having a hollow portion having substantially the same diameter as the shaft 3 is divided into two, and is attached so that the shaft 3 is sandwiched from both sides. And
The circuit boards 7a and 7b are joined by attaching conductors 8 made of metal or the like at two corresponding positions with the shaft 3 interposed therebetween by screws 9a and nuts 9b. In addition, a protrusion 7c is formed near the hollow portion on the back side of the circuit boards 7a and 7b so as to be in contact with the shaft 3.
These projections 7c are provided at various locations (see FIG. 3).
Is bonded and fixed to the shaft 3, so that the shaft 3
The circuit board 7 is prevented from slipping when rotating.

For example, on the front side of the circuit board 7a, a wiring pattern of the control circuit section 18a of the transmitter 18 which will be described later is formed, and on the front side of the circuit board 7b, the wiring pattern of the battery 10 (see FIG. 1) is similarly formed. Are formed. Further, the circuit components of the control circuit unit 18a are mounted on the back side of the circuit board 7a, and the battery 10 is mounted on the back side of the circuit board 7b. Then, the conductors 8 and 8 include the screw 9a and the nut 9
Among the wiring patterns made of copper foil (not shown) of the circuit boards 7a and 7b by b, one is connected to the power supply pattern and the other is connected to the ground pattern, so that the battery 10 of the circuit board 7b to the control circuit section of the circuit board 7a are connected. Power is supplied to 18a.

Then, as shown in FIG. 3, the circuit board 7a
On the back side of the rotors 7 and 7b, the six fins 11 for cooling the rotor 2 are attached at a predetermined angle with respect to the surfaces of the circuit boards 7a and 7b so that the fins 11 have an elevation angle with respect to the rotation direction of the motor 1. It is fixed. The rotor 2 described above is arranged inside a motor housing (not shown).

Referring again to FIG. 4, a temperature sensor 12a serving as a temperature detecting means composed of an IC temperature sensor or the like.
Is fixed to the left end surface of the magnet 5 with an adhesive or the like, and measures the temperature of the magnet 5. Further, the other temperature sensor 12b is similarly adhered and fixed near the base of the shaft 3 with respect to the core 4, and measures the temperature of the shaft 3.

In FIG. 1 showing the electrical structure, the output terminals of the temperature sensors 12a and 12b are connected to the input terminals of the signal conversion circuits 13a and 13b, which are signal conversion means, respectively, and the signal conversion circuits 13a and 13b are connected. The output terminals are respectively connected to the input terminals of the signal mixing circuit 14 which is a signal mixing means. The signal mixing circuit 14 mixes the given two input signals into one signal as described later and outputs the mixed signal.

The output terminal of the signal mixing circuit 14 is connected to the input terminal of the transmission circuit 16 via the modulation circuit 15 which is the modulation means. Thus, the output terminal of the transmission circuit 16 is connected to the transmission antenna 17, and the transmission circuit 16 transmits the modulated signal from the modulation circuit 15 as a radio wave which is an aerial propagation signal from the transmission antenna 17. There is.

The transmitting circuit 16 and the transmitting antenna 17 constitute a transmitting means, and the signal converting circuits 13a and 13a.
b, the signal mixing circuit 14, the modulation circuit 15, the transmission circuit 16 and the transmission antenna 17 constitute a control circuit unit 18a. The control circuit section 18a is mounted on the circuit board 7a as described above, and the power is supplied from the battery 10 mounted on the circuit board 7b. In addition, the battery 10 and the control circuit unit 18 a constitute the transmission device 18.

On the other hand, the receiving antenna 19 includes a receiving circuit 20.
The input terminal of the receiving circuit 20 is connected to the input terminal of the signal separating circuit 22 which is the signal separating means via the demodulating circuit 21 which is the demodulating means.
The receiving antenna 19 and the receiving circuit 20 form a receiving means. Then, the receiving circuit 20 includes the receiving antenna 1
The radio wave received by 9 is output to the demodulation circuit 21 as an electric signal, and the demodulation circuit 21 demodulates the signal from the modulated signal and outputs it to the signal separation circuit 22.

The output terminal of the signal separation circuit 22 is connected to the input terminals of the signal inverse conversion circuits 23a and 23b which are the signal inverse conversion means. The above constitutes the receiving device 24, and the temperature sensors 12a and 12b, the transmitting device 18 and the receiving device 24 constitute a temperature measuring device 25. Thus, the output terminals of the signal inverse conversion circuits 23a and 23b are connected to the input terminal of the data logger 26. The receiving device 24 is installed on the outer surface of the motor housing or is installed at an appropriate place slightly away from the motor 1.

Next, the operation of the first embodiment will be described with reference to FIG. When the shaft 3 of the motor 1 rotates, the circuit board 7 rotates accordingly. Then, the fins 11 attached to the circuit board 7 generate an air flow toward the rotor 2, and the rotor 2 is cooled. On the other hand, the temperature sensors 12a and 12b measure the temperatures of the left end surface of the magnet 5 of the motor 1 and the shaft 3 and output voltage signals Sva and Svb as measurement temperature signals corresponding to the temperatures. The signal conversion circuits 13a and 13b use the voltage signals Sva and Svb.
Is converted into frequency signals Sfa and Sfb whose frequencies are changed in accordance with the voltage change, and then output.

In this case, the ratio of voltage / frequency conversion is, for example, 1 V / 1000 Hz. Also, the frequency signal S
The amplitude level of fa is output at different levels by the amplitude signal conversion circuits 13a and 13b so as to be higher than the amplitude level of the frequency signal Sfb (see FIGS. 5A and 5B).

The frequency signals Sfa and Sfb are mixed and output by the signal mixing circuit 14 as one frequency signal Sf by alternately reading the amplitude levels of both signals in a time division manner as shown in FIG. 5C. It Then, the modulation circuit 15 FM-modulates the carrier signal using the frequency signal Sf as a modulation signal, and outputs the modulated signal Sfm. Thus,
The modulated signal Sfm is transmitted as a radio wave from the transmitting antenna 17 via the transmitting circuit 16. This radio wave is radiated to the outside of the motor housing through a ventilation cooling port (not shown) provided in the motor housing.

On the other hand, the receiving circuit 20 of the receiving device 24 gives the modulated signal Sfm received by the receiving antenna 19 to the demodulating circuit 21 as an electric signal. The demodulation circuit 21, when demodulating the frequency signal Sf from the modulated signal Sfm, gives the frequency signal Sf to the signal separation circuit 22. Signal separation circuit 22
Separates the frequency signal Sf into two frequency signals Sfa and Sfb. At this time, the two signals are discriminated by the magnitude of the amplitude level.

Then, the signal inverse conversion circuits 23a and 23b.
Converts the frequency signals Sfa and Sfb into voltage signals Sva and Svb by frequency / voltage conversion at a rate of 1000 Hz / 1 V according to the change in the frequency, and outputs the voltage signals Sva and Svb to the data logger 26.

Thus, the data logger 26 uses the voltage signal S
Temperature data of the magnet 5 and the shaft 3 of the motor 1 according to va and Svb are sequentially output to a recording sheet by a pen recorder or the like. Therefore, by looking at the recording paper of the data logger 26, it is possible to observe in real time the temperature changes of the magnet 5 and the shaft 3 when the motor 1 is in operation.

As described above, according to the present embodiment, the transmitter 18 controls the voltage signals Sva and Svb corresponding to the temperatures of the magnet 5 and the shaft 3 of the motor 1 measured by the temperature sensors 12a and 12b. And Sfb and then mixed to form one frequency signal Sf, the modulated signal Sfm FM-modulated by the frequency signal Sf.
Is configured to be transmitted as radio waves, and the receiving device 24 is
When the modulated signal Sfm is received, it is demodulated into a frequency signal Sf, separated into two frequency signals Sfa and Sfb, inversely converted into voltage signals Sva and Svb, and output to the data logger 26.

Therefore, unlike the prior art, the temperature of the rotor 2 of the motor 1 is measured in real time and with high accuracy even when the motor 1 is in operation, and the state in which the temperature changes can be easily observed. be able to. Moreover, since the two temperature data measured by the two temperature sensors 12a and 12b can be obtained at the same time, the measurement work can be efficiently performed. Moreover, since the modulation circuit 15 performs FM modulation, the configurations of the modulation circuit 15 and the demodulation circuit 21 become easy.

Further, the transmitter 18 is connected to the two circuit boards 7
Since the circuit boards 7a and 7b are mounted on a and 7b, and the circuit boards 7a and 7b are sandwiched from both sides of the shaft 3 and attached to the rotor 2, the transmitter 18 can be easily attached to the rotor 2.

Further, according to this embodiment, the fins 11 for cooling the rotor 2 are provided on the circuit boards 7a and 7b of the transmitter 18.
Since the motor has been installed, the fin 11
The rotor 2 can be cooled by the air flow generated by.

FIG. 6 shows a second embodiment of the present invention. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Only different parts will be described below. In FIG. 6, the bearing 6 a on the left end side of the shaft 3 and the magnet 5
An insulator 27 made of resin or the like, which is formed by vertically dividing a cylinder into two parts, is attached and fixed between the and so as to sandwich the shaft 3. The transmitter 18 (see FIG. 1) is mounted on the flexible circuit board 28 instead of the circuit board 7 of the first embodiment, and the flexible circuit board 28 is wound around the outer periphery of the insulator 27. It is fixed by adhesion.

The temperature sensor 12b is connected to the shaft 3
Of the first embodiment is adhered and fixed near the base of the insulator 27, and the other configurations are similar to those of the first embodiment. According to the second embodiment configured as described above, substantially the same effects as the first embodiment are achieved.

FIG. 7 shows a third embodiment of the present invention. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Only different parts will be described below. In FIG. 7, on the left end surface of the core 4, a disc-shaped circuit board 29 having a cutout portion 29 a from the central portion toward the outer peripheral portion is provided.
It is fixed by 0. The transmitter 18 is mounted on the circuit board 29 instead of the circuit board 7 of the first embodiment.

The temperature sensor 12b is connected to the shaft 3
Is fixed to the vicinity of the root of the circuit board 29, and otherwise has the same configuration as that of the first embodiment. According to the third embodiment configured as described above, substantially the same effect as the first embodiment is obtained.

FIG. 8 shows a fourth embodiment of the present invention. The same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Only different parts will be described below. In FIG. 8, the bearing 6a on the left end side of the shaft 3 and the magnet 5 are
A rectangular parallelepiped two-divided insulator 31, which is made of a resin or the like and has a hole 31a for allowing the shaft 3 to penetrate therethrough, is disposed between and. Two conductive spacers 32 made of metal or the like are provided in the left and right directions above and below the insulator 31 (only two are shown in the figure). Square circuit boards 33a and 33b are arranged to face each other on both sides of the insulator 31 so as to sandwich the insulator 31, and the four corners thereof are screwed to the spacer 32 by screws 34. (The circuit board 33b side is not shown) is fixed by.

Then, the transmitting device 18 has circuit boards 33a and 3a instead of the circuit boards 7a and 7b of the first embodiment.
It is implemented in 3b. Of the wiring patterns made of copper foil (not shown) of the circuit boards 33a and 33b by the screws 34, one of the spacers 32 is connected to the power supply pattern and the other is connected to the ground pattern, whereby the circuit board 3 is formed.
3b of battery 10 to control circuit section 18a of circuit board 33a
It is designed to supply power to.

The temperature sensor 12b has a shaft 3
Is adhered and fixed near the base of the insulator 32. The other structure is the same as that of the first embodiment. According to the third embodiment configured as described above, the same effects as those of the first embodiment are obtained, and the circuit boards 33a and 33b rotate with the rotation of the shaft 3 without providing the fin 11. As a result, an air flow is generated and the rotor 2 can be cooled.

The present invention is not limited to the embodiments described above and shown in the drawings, but the following modifications are possible. The mounting positions of the temperature sensors 12a and 12b are not limited to the illustrated positions, but may be the end surface on the opposite side of the magnet 5, the bearings 6a and 6b, or the inside of the magnet 5. The number of temperature sensors as the temperature detecting means is not limited to two, that is, 12a and 12b, and one or three or more may be used. If there is only one temperature sensor, the signal mixing circuit 1
4 and the signal separation circuit 22 may be omitted. The conversion ratio in the voltage / frequency conversion is not limited to 1 V / 1000 Hz and may be changed as appropriate.

The method of mixing the two frequency signals Sfa and Sfb into the single frequency signal Sf by the signal mixing circuit 14 and the signal separating circuit 22 and separating them is not limited to the method shown in the first embodiment, but may be, for example, FM. It may be the same as the system used for stereo broadcasting. That is, in the signal mixing circuit 14, a signal (S) obtained by adding both the frequency signals Sfa and Sfb
fa + Sfb) and the subtracted signal (Sfa-Sfb) are calculated,
The addition signal (Sfa + Sfb) and the subtraction signal (Sfa-Sfb) are balanced-modulated by the subcarrier to output a sum signal, and the signal separation circuit 22 performs switching demodulation on the demodulated sum signal on the subcarrier. Frequency signals Sfa and Sfb
May be separated.

The modulation circuit 15 and the demodulation circuit 21 are not limited to those that modulate and demodulate the FM signal, but may use other modulation and demodulation methods such as AM signals, PM signals and pulse modulation signals.
In that case, the signal conversion circuits 13a and 13b and the signal inverse conversion circuits 23a and 23b may be omitted or appropriately changed according to another modulation / demodulation method. The fins 11 may be provided as needed. Further, the number of fins 11 may be changed appropriately.

The means for displaying and recording the voltage signal output by the receiver 24 as temperature data is a data logger 26.
However, the present invention is not limited to this, and may be appropriately changed by, for example, performing A / D conversion and loading the data into a personal computer to sequentially display the data on the display, and at the same time sequentially storing data in a storage device such as a hard disk or a floppy disk.

[0039]

Since the present invention is as described above,
The following effects are obtained. According to the motor temperature measuring device of claim 1, the transmitting device incorporated in the rotating body of the motor comprises:
The carrier signal is modulated according to the measured temperature signal of the rotating body of the motor output by the temperature measuring means, and the modulated signal is transmitted as an airborne signal, and the receiving device receives the airborne signal and receives the signal. Since the measured temperature signal is demodulated from the modulation signal, the temperature of the rotating body of the motor can be measured in real time and with high accuracy even when the motor is in operation.

According to the motor temperature measuring device of the second aspect, the transmitting device incorporated in the rotating body of the motor changes the voltage according to the measured temperature of the rotating body of the motor output by the plurality of temperature measuring means. The generated voltage signal is converted into a frequency signal, and the carrier signal is FM-modulated by using a mixture of the plurality of frequency signals into one frequency signal as a modulation signal,
The modulated signal is transmitted as an airborne signal, and the receiving device receives the airborne signal, demodulates a frequency signal from the modulated signal, separates the frequency signals into the plurality of frequency signals, and then inversely converts the voltage signal. Therefore, it is possible to simultaneously measure the temperatures of a plurality of portions of the rotating body of the motor, and it is possible to efficiently perform the measurement work.

According to the motor temperature measuring device of the third aspect, the transmitting device can be easily attached to the rotating body of the motor. According to the motor temperature measuring device of claim 4,
When the motor rotates, the fins attached to the circuit board of the transmission device generate an air flow, so that the rotating body can be cooled.

[Brief description of the drawings]

FIG. 1 is a diagram showing an electrical configuration of a first embodiment of the present invention.

FIG. 2 is a front view of a circuit board.

FIG. 3 is a rear view of the circuit board.

FIG. 4 is a perspective view showing a structure of a rotating body of a motor.

FIG. 5 is a diagram showing input / output waveforms of a signal mixing circuit.

FIG. 6 is a view corresponding to FIG. 4, showing a second embodiment of the present invention.

FIG. 7 is a view corresponding to FIG. 4, showing a third embodiment of the present invention.

FIG. 8 is a view corresponding to FIG. 4 showing a fourth embodiment of the present invention.

[Description of Reference Signs] 1 is a motor, 2 is a rotor (rotating body), 7a and 7b are circuit boards, 11 is fins, 12a and 12b are temperature sensors, 13a and 13b are signal conversion circuits (signal conversion means), and 14 is Signal mixing circuit (signal mixing means), 15 modulation circuit (signal modulation means), 16 transmission circuit (transmission means), 17 transmission antenna (transmission means), 18 transmission device, 19 reception antenna (reception means) , 20 is a receiving circuit (receiving means), 21 is a demodulating circuit (demodulating means), 22 is a signal separating circuit (signal separating means), 23a and 23b are signal inverse converting circuits (signal inverse converting means), 24 is a receiving device, 25
Is a temperature measuring device, and 33a and 33b are circuit boards.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Isao Kishimoto 991, Anada Town, Seto City, Aichi Prefecture Toshiba Corporation Aichi Factory

Claims (4)

[Claims] 1. A temperature measuring means for measuring a temperature of a rotating body of a motor, a modulating means for modulating a carrier signal according to a temperature signal measured by the temperature measuring means and outputting a modulated signal, and the modulating means. A transmitter configured to transmit the output modulated signal as an aerial propagation signal and incorporated into a rotating body of the motor, and a receiving unit that receives the aerial propagation signal and outputs the modulated signal. 2. A motor temperature measuring device comprising: a receiving device including: and a demodulating device that demodulates the measured temperature signal from the modulated signal output by the receiving device. 2. A plurality of temperature measuring means for measuring the temperature of a rotating body of a motor and outputting a voltage signal in which a voltage is changed according to the measured temperature, and the voltage signals outputted by these temperature measuring means are A plurality of signal converting means for converting the frequency signal whose frequency is changed according to the voltage level, a signal mixing means for mixing the frequency signals converted by the plurality of signal converting means into one frequency signal, and this signal The modulating means comprises FM modulating the carrier signal with the mixed frequency signal to output a modulated signal, and transmitting means transmitting the modulated signal output by the modulating means as an airborne signal. A transmitter incorporated in the rotating body of the motor, a receiving unit that receives the airborne signal and outputs the modulated signal, and the modulated unit output by the receiving unit. From the signal to the frequency signal, a separating means for separating the frequency signal demodulated by the demodulating means into a plurality of frequency signals, and a plurality of the frequency signals separated by the separating means according to their frequencies. And a receiving device including a plurality of signal inverse conversion means for inversely converting the voltage into a voltage signal with a changed voltage. 3. The transmitter is configured by being mounted on two circuit boards, and these circuit boards are mounted on and fixed to the shaft of the motor from both sides thereof so as to be incorporated in the rotating body of the motor. The motor temperature measuring device according to claim 1 or 2, characterized in that. 4. The motor temperature measuring device according to claim 3, wherein the transmitting device has a fin for cooling the rotating body attached to a circuit board.