JP2009247084A - Rotary electric machine and vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately detect the temperature of the rotor of a rotary electric machine. <P>SOLUTION: The rotary electric machine includes: a stator 4; a rotor 2 rotatably supported in the stator 4 with a predetermined gap in-between; and an RFID tag 1 with a temperature sensor provided in the rotor 2. Temperature sensing data transmitted from the RFID tag 1 with the temperature sensor is received by an RFID tag read/write terminal 5 and input to a vehicle controller 6. The vehicle controller 6 alarms a higher level system in abnormal conditions or limits operation according to the temperature information. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine and an automobile.

  In a rotary electric machine, for example, a permanent magnet type rotary electric machine, it is important to measure the temperature of the rotor because the permanent magnet of the rotor may be demagnetized by temperature.

  As a method of measuring the temperature of a rotating electrical machine, it is known to estimate the current temperature of a permanent magnet from a stator temperature detection value by a temperature sensor such as a thermistor (see, for example, Patent Document 1).

JP-A-7-212915 (paragraph 0011)

  Since the rotor is a rotating body, it is difficult to attach a wired temperature sensor due to restrictions on wiring. On the other hand, the above technique estimates the temperature of the permanent magnet from the temperature of the stator, and there is a problem that the error is large depending on the operating condition and is not practical.

  In view of the above, an object of the present invention is to accurately detect the temperature of a rotor of a rotating electrical machine.

  The present invention is a rotating electrical machine having a stator, a rotor rotatably supported by the stator with a predetermined gap, and an RFID (Radio Frequency Identification) tag provided on the rotor and having a temperature sensor.

  The present invention also includes a stator, a rotor that is rotatably supported by the stator with a predetermined gap, a rotating electric machine that is provided on the rotor, and that has a temperature sensor, and receives information from the RFID tag. The vehicle includes a terminal and a control device that inputs sensing information of the temperature sensor from the terminal and controls the vehicle based on the sensing information.

  ADVANTAGE OF THE INVENTION According to this invention, the temperature of the rotor of a rotary electric machine can be detected accurately.

  Embodiments of the present invention will be described below. This embodiment is applicable to various motors used in electric vehicles, hybrid vehicles, and fuel cell vehicles.

  The rotor of the rotating electrical machine needs to be designed with a sufficient design margin for the allowable temperature, and it is important to know the upper limit temperature of the rotor temperature. However, it is difficult to predict the rotor temperature during operation because the usage environment or usage of the motor varies. Actually, there is a case where the use of the motor is restricted more than necessary due to excessive design margin. On the other hand, since the mounting location and usage of the motor are various, the rotor temperature may exceed the allowable temperature of the magnet, and the magnet may be demagnetized.

  Therefore, in the following embodiment, by attaching an RFID tag with a temperature sensor that can be easily attached to the rotor of the rotating machine, the rotor temperature is monitored in a timely manner, and a rotating machine that can be used up to the upper limit of the rotor temperature is provided. provide. If the RFID tag with a temperature sensor having this configuration is used, the temperature of the rotor can be confirmed without wiring. An RFID tag without a temperature sensor can be used for reading and writing data with a small amount of electric power from the data reading and writing terminal, but if a temperature sensor is used, it cannot be handled with a small amount of power. Power or battery is required. Here, the inductive power generated by the change in the magnetic flux of the rotor is used to generate power or charge the battery, and the power is used for processing of the temperature sensor.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a rotating machine according to the present invention will be described below with reference to the drawings, taking a drive motor for a hybrid vehicle as an example.

  FIG. 1 shows a rotating machine in which an RFID tag 1 with a temperature sensor is mounted on a rotor 2. This figure is an example in which the RFID tag 1 with a temperature sensor is attached to the end plate 3 of the rotor 2. The rotor 2 is rotatably supported with a predetermined gap (gap) with respect to the stator 4. Although a motor for driving a hybrid vehicle has a temperature sensor on the stator coil 4, the rotor 2 of the rotating body also has problems such as wiring, so that it is general that no temperature sensor is attached. In the present system using the RFID tag 1 with temperature sensor, the RFID tag reading / writing terminal 5 wirelessly reads the data of the RFID tag 1 with temperature sensor attached to the rotor, and the temperature data result is a vehicle controller as a control device. 6 is used to restrict the acquisition of temperature information during normal operation and alarm or operation to the host system during an abnormality.

  FIG. 2 shows an RFID tag with a temperature sensor. This tag includes a power generation circuit 15 that generates power using inductive power generated by a change in magnetic flux of the rotor when the motor rotates, a power supply circuit 14 that adjusts the voltage suitable for the sensor, and a temperature at which temperature is sensed using the power. It has a sensor 13. The processed temperature information is stored in the IC chip 11 of the RFID tag and transmitted to the RFID tag reading / writing terminal 5 using the antenna 12 at an appropriate time.

  FIG. 3 shows an example when a battery 17 is mounted on an RFID tag with a temperature sensor. This tag uses the power generation circuit 15 that generates electric power using the induction power generated by the change in the magnetic flux of the rotor when the motor rotates, the charging circuit 16 that adjusts the voltage suitable for charging the battery 17, and the power of the battery 17. Temperature sensor 13 for sensing temperature. The processed temperature information is stored in the IC chip 11 of the RFID tag and transmitted to the RFID tag reading / writing terminal 5 using the antenna 12 at an appropriate time.

  FIG. 4 shows an example in which the RFID tag 1 with temperature sensor is integrated with the magnet 7. The RFID tag with temperature sensor 1 is preferably attached to a heat generating part of the rotor 2 or a thermally critical part. In the permanent magnet synchronous motor, a magnet 7 is incorporated in the rotor 2. During motor operation, the magnet 7 is a thermally critical part because the magnet body generates heat and the allowable temperature of the magnet is limited. In this example, a magnet is attached to the magnet 7 body. Along with the downsizing of the tag, the RFID tag with temperature sensor 1 may be incorporated at the time of manufacturing the magnet 7 to be an RFID tag integrated magnet with temperature sensor.

  FIG. 5 shows an example in which the RFID tag with temperature sensor is integrated with the rotor steel plate 8. An RFID tag with a temperature sensor is incorporated in the rotor 2. Since the rotor steel plate 8 is a portion that generates heat and represents the temperature of the entire rotor 2, it is effective to attach the RFID tag 1 with a temperature sensor to the rotor steel plate 8. Along with the downsizing of the tag, the RFID tag with temperature sensor 1 may be incorporated when manufacturing the rotor core, and handled as an RFID tag integrated rotor core with temperature sensor.

  It is expected that the entire sensor including the temperature sensor will be wireless from the current wired. Further, RFID tags are expected to become widespread as means for wireless data transmission / reception. If an RFID tag with a temperature sensor is used, temperature data can be obtained wirelessly from a large number of tags, and it is considered possible to perform unified management of the temperature sensor processing of an automobile in the future. In this embodiment, since the RFID tag with a temperature sensor is attached to the rotor of a rotating body that is advantageous in radio, it is considered that there is a possibility of use in the future.

  According to the above embodiment, the temperature of the rotor of the rotating electrical machine can be detected with high accuracy.

It is explanatory drawing of the rotary machine which mounted | wore the rotor with the RFID tag with a temperature sensor which makes one Embodiment of this invention. This is an example in which a power generation circuit and a power supply circuit are mounted on an RFID tag with a temperature sensor according to an embodiment of the present invention. This is an example in which a power generation circuit, a charging circuit, and a battery are mounted on an RFID tag with a temperature sensor that constitutes an embodiment of the present invention. It is the example which made the RFID tag with a temperature sensor which makes one Embodiment of this invention integral with a magnet. It is an example which made the RFID tag with a temperature sensor which makes one Embodiment of this invention integral with a rotor steel plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 RFID tag with temperature sensor 2 Rotor 3 End plate 4 Stator coil 5 RFID tag reading / writing terminal 6 Vehicle controller 7 Magnet 8 Rotor steel plate 11 IC chip 12 Antenna 13 Temperature sensor 14 Power supply circuit 15 Power generation circuit 16 Charging circuit 17 Battery

Claims (8)

A stator,
A rotor rotatably supported by the stator with a predetermined gap;
An RFID tag provided on the rotor and having a temperature sensor;
Rotating electric machine having The rotating electrical machine according to claim 1,
The RFID tag has a power generation circuit using inductive power generated by a change in magnetic flux of the rotor when the rotor rotates.
The temperature sensor is a rotating electrical machine that senses temperature using the generated power of the power generation circuit. The rotating electrical machine according to claim 1,
The RFID tag includes a power generation circuit that uses inductive power generated by a change in magnetic flux of the rotor when the rotor rotates, and an antenna that transmits information using the power generated by the power generation circuit. The rotating electrical machine according to claim 1,
The RFID tag includes a power generation circuit that uses inductive power generated by a change in magnetic flux of the rotor when the rotor rotates, a battery that charges the generated power of the power generation circuit, a charging circuit that charges the battery, Rotating electric machine having The rotating electrical machine according to claim 1,
The RFID tag is a rotating electrical machine attached to a magnet fixed to the rotor. The rotating electrical machine according to claim 1,
The RFID tag is a rotating electrical machine attached to a steel plate of the rotor. The rotating electrical machine according to claim 1,
The RFID tag is a rotating electrical machine attached to an end plate of the rotor. A rotating electrical machine having a stator, a rotor rotatably supported by the stator with a predetermined gap, and an RFID tag provided on the rotor and having a temperature sensor;
A terminal for receiving information from the RFID tag;
A control device that inputs sensing information of the temperature sensor from the terminal and controls the vehicle based on the sensing information;
Car with.

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