JP4853124B2 - Permanent magnet temperature detector for permanent magnet type rotating machine - Google Patents

Description

  The present invention relates to a temperature detection device for a permanent magnet used in a permanent magnet type rotating machine.

  Conventionally, a permanent magnet for temperature detection is attached to the rotor of an electric motor, and the temperature of the part where the permanent magnet of the rotor is attached is detected by detecting the amount of magnetic flux in the gap between the permanent magnet and the magnetic body. An apparatus is known (see Patent Document 1).

JP 62-104453 A

  However, in the conventional temperature detection device, a permanent magnet for temperature detection is separately provided on the rotor of the electric motor, and the temperature of the part where the permanent magnet is attached is detected. There is a problem that the temperature of the permanent magnet used for the child cannot be detected with high accuracy.

  A permanent magnet temperature detecting device for a permanent magnet type rotating machine according to the present invention is provided with a magnetic flux density measuring means in a stator of a permanent magnet type rotating machine using a permanent magnet as a rotor, and between the rotor and the stator. The magnetic flux density of the permanent magnet is extracted from the measured magnetic flux magnetic flux density by excluding the magnetic flux density caused by the armature reaction, and based on the extracted permanent magnet magnetic flux density. It is characterized by estimating temperature.

  According to the permanent magnet temperature detecting device of the permanent magnet type rotating machine according to the present invention, the magnetic flux density between the rotor and the stator is measured, and the magnetic flux density caused by the armature reaction is measured from the measured magnetic flux density. Since the temperature of the permanent magnet is estimated after extracting the magnetic flux density of the permanent magnet, the temperature of the permanent magnet can be estimated with high accuracy.

-First embodiment-
FIG. 1 is a diagram showing an overall configuration of a permanent magnet temperature detection device of a permanent magnet type rotating machine according to a first embodiment. The permanent magnet temperature detecting device of the permanent magnet type rotating machine in the first embodiment includes a magnetic sensor 1, a processing device 2, and a current sensor 3. Here, a Hall element is used as the magnetic sensor 1. The processing device 2 includes at least a CPU 2a and a memory 2b, and performs a process of estimating the temperature of the permanent magnet used in the rotor of the permanent magnet type rotating machine, as will be described later. The current sensor 3 detects a current flowing through the permanent magnet type rotating machine.

  Hereinafter, an IPM motor will be described as an example of a permanent magnet type rotating machine. FIG. 2 is a diagram illustrating a configuration of the IPM motor 10. The IPM motor 10 includes a rotor (rotor) 11 in which permanent magnets 11a to 11h are embedded, and a stator (stator) 12 having a distributed winding structure.

  The permanent magnets 11a to 11h are standard neodymium magnets, and the temperature coefficient of the residual magnetic flux density is -0.1% / K. Since the permanent magnet has a temperature characteristic that the residual magnetic flux density decreases as the temperature increases, the temperature of the permanent magnet is detected based on the residual magnetic flux density of the permanent magnet.

  In the permanent magnet temperature detecting device of the permanent magnet type rotating machine in the first embodiment, a Hall element is provided at the tip of the teeth of the stator 12, and the gap magnetic flux density between the rotor 11 and the stator 12 is measured. Detect the temperature of the permanent magnet. FIG. 3 is a view showing the hall element 20 provided at the tip of one tooth 12 a of the stator 12.

  FIG. 4A is a graph showing the gap magnetic flux density value detected using the Hall element 20 when the conduction angle is 0 deg and the temperature of the permanent magnet is 20 ° C., 80 ° C., and 140 ° C. The graphs at the respective temperatures represent, in order from the left, results when a current corresponding to no load and a half load is passed, and a current corresponding to a full load is passed. However, the air gap magnetic flux density value is expressed as a relative value (%) based on the value when the temperature of the permanent magnet is 20 ° C. and no load is applied.

  Similarly, FIG. 4B shows the result when the conduction angle is 30 degrees, and FIG. 4C shows the result when the conduction angle is 60 degrees. As shown in FIGS. 4A to 4C, the air gap magnetic flux density detected using the Hall element 20 decreases as the temperature of the permanent magnet increases. However, the value of the magnetic flux density varies depending on the magnitude of the armature current flowing through the IPM motor 10. This is because the magnetic flux generated from the permanent magnet is affected by the influence of the armature reaction, that is, the magnetic flux generated when the armature current is passed. Therefore, a magnetic flux component (hereinafter referred to as a permanent magnetic flux) generated from a permanent magnet by excluding a magnetic flux component (hereinafter referred to as an armature reactive component) due to an armature reaction from the gap magnetic flux density detected using the Hall element 20. It is necessary to take out only the magnet component.

The air gap magnetic flux density Bgap is expressed by the following equation (1) based on the permanent magnet component Bmag and the armature reaction component Ba.
Bgap = Bmag + Ba (1)
In equation (1), underlined Bgap , Bmag , and Ba each represent a vector.

When the nonlinearity due to saturation of the magnetic circuit is not strong, the armature reaction component Ba is expressed by the following equation (2), where the d-axis is a real part. In the current flowing through the IPM motor 10, the axis corresponding to the excitation current component is d-axis and the axis corresponding to the torque current component is q-axis.
Ba = K × (Lad × Id + jLaq × Iq) (2)
However, in Formula (2), j is an imaginary number and K is a constant determined for each machine. Further, Lad is a d-axis armature reaction inductance, and Laq is a q-axis armature reaction inductance.

  From Formula (2), by setting the values of Lad, Laq, and K to appropriate values according to the structure of the IPM motor 10, the magnetic flux density component Ba caused by the armature reaction can be obtained. The CPU 2a of the processing device 2 calculates the armature reaction component Ba from the above equation (2), and based on the calculated armature reaction component Ba and the gap magnetic flux density Bgap detected using the Hall element 20, The permanent magnet component Bmag is obtained from the vector relationship shown in Expression (1).

  FIG. 5A is a graph showing the permanent magnet component Bmag obtained by the above-described method when the energization angle is 0 deg and the temperature of the permanent magnet is 20 ° C., 80 ° C., and 140 ° C. FIG. Similar to FIG. 4, the graph at each temperature represents, in order from the left, a result when a current corresponding to no load and a half load is passed, and a current corresponding to a full load is passed. FIGS. 5B and 5C show the results when the energization angles are 30 deg and 60 deg, respectively. As shown in FIGS. 5A to 5C, even if the current flowing through the IPM motor 10 is different, the permanent magnet component Bmag is substantially constant if the temperature of the permanent magnet is the same. I understand.

  The memory 2b of the processing device 2 stores data in which the magnetic flux density of the permanent magnet is associated with the temperature. The CPU 2a refers to the data stored in the memory 2b on the basis of the permanent magnet component Bmag excluding the armature reaction component Ba from the gap magnetic flux density Bgap detected using the Hall element 20, thereby causing the rotor 11 to The temperature of the embedded permanent magnet is detected. By detecting the temperature of the permanent magnet, the temperature of the rotor 11 can be grasped.

  According to the permanent magnet temperature detection device of the permanent magnet type rotating machine in the first embodiment, the temperature of the permanent magnet is detected by the following procedure. First, a Hall element 20 is provided in a stator 12 of a permanent magnet type rotating machine using a permanent magnet for the rotor 11 to measure a gap magnetic flux density Bgap between the rotor 11 and the stator 12, and an armature. The magnetic flux density Ba resulting from the reaction is detected. Then, from the gap magnetic flux density Bgap measured using the Hall element 20, the magnetic flux density Ba caused by the armature reaction is excluded, and the magnetic flux density Bmag of the permanent magnet is extracted. Based on the extracted permanent magnet magnetic flux density Bmag. Estimate the temperature of the permanent magnet. As a result, the temperature of the permanent magnet can be accurately estimated without being affected by the armature reaction.

  In particular, since the Hall element 20 is provided at the tip of one tooth of the stator 12, it is possible to easily estimate the temperature of the permanent magnet without requiring processing of the rotor 11. Further, the rotational speed of the rotor 11 is not restricted.

-Second Embodiment-
In the permanent magnet temperature detecting device of the permanent magnet type rotating machine according to the first embodiment, a Hall element is provided at the tip of the teeth of the stator 12 and the magnetic flux density between the rotor 11 and the stator 12 is measured. In the permanent magnet temperature detecting device of the permanent magnet type rotating machine according to the second embodiment, a search coil is wound around one tooth of the stator 12 and the magnetic flux density is measured. FIG. 6 is a view showing the search coil 30 wound around one tooth 12 a of the stator 12.

  FIG. 7A is a graph showing the air gap magnetic flux density value detected using the search coil 30 when the energization angle is 0 deg and the temperature of the permanent magnet is 20 ° C., 80 ° C., and 140 ° C. FIG. The graphs at the respective temperatures represent, in order from the left, results when a current corresponding to no load and a half load is passed, and a current corresponding to a full load is passed. However, the gap magnetic flux density value is expressed as a relative value (%) based on the value when the temperature of the permanent magnet is 20 ° C. and corresponding to no load. Similarly, FIG. 7B shows the result when the conduction angle is 30 degrees, and FIG. 7C shows the result when the conduction angle is 60 degrees.

  As in the case where the air gap magnetic flux density is detected using the Hall element 20, as the temperature of the permanent magnet increases, the air gap magnetic flux density detected by the Hall element 20 decreases, but due to the influence of the armature reaction, The value of the magnetic flux density varies depending on the magnitude of the armature current flowing through the IPM motor 10.

  FIG. 8A is a graph of the permanent magnet component Bmag obtained by the method described in the first embodiment when the energization angle is 0 deg and the temperature of the permanent magnet is 20 ° C., 80 ° C., and 140 ° C. It is. Similarly to FIG. 7, the graph at each temperature represents, in order from the left, a result when a current corresponding to no load and a half load is passed, and a current corresponding to a full load is passed. FIGS. 8B and 8C show the results when the energization angles are 30 deg and 60 deg, respectively.

  As shown in FIGS. 8B to 8C, the permanent magnet component Bmag is substantially constant as long as the temperature of the permanent magnet is the same even when the current flowing through the IPM motor 10 is different. I understand. That is, the permanent magnet component excluding the armature reaction component Ba from the gap magnetic flux density Bgap detected using the search coil 30 as in the permanent magnet temperature detecting device of the permanent magnet type rotating machine in the first embodiment. Based on Bmag, the temperature of the permanent magnet can be detected.

  According to the permanent magnet temperature detecting device of the permanent magnet type rotating machine in the second embodiment, the magnetic flux density Ba caused by the armature reaction is excluded from the gap magnetic flux density Bgap measured using the search coil 30. Since the permanent magnet magnetic flux density Bmag is extracted and the permanent magnet temperature is estimated based on the extracted permanent magnet magnetic flux density Bmag, the permanent magnet temperature is accurately estimated without being affected by the armature reaction. can do. By using a search coil as the magnetic sensor 1, the cost can be reduced as compared with the case of using a Hall element. Further, since the search coil is simply wound around one tooth of the stator 12, it can be applied to a stator core of any size and shape.

-Third embodiment-
In the permanent magnet temperature detecting device of the permanent magnet type rotating machine in the first and second embodiments, the magnetic flux density Ba resulting from the armature reaction was obtained from the equation (2). However, when the magnetic saturation is large and the nonlinearity is strong with respect to the armature current, the value of the magnetic flux density Ba calculated by the equation (2) has an error from the actual value. In the permanent magnet temperature detecting device of the permanent magnet type rotating machine in the third embodiment, a map of the armature reaction component Ba corresponding to the current flowing through the IPM motor 10 and the energization angle is prepared in advance. Based on this, the armature reaction component Ba is obtained, and the permanent magnet component Bmag is obtained.

  FIG. 9A and FIG. 9B show examples of maps of Baq and Bad with respect to the current | I | flowing through the IPM motor 10 and the conduction angle ∠I, respectively. The provided hall element 20 is used. However, | I | represents a ratio (%) to the rated current of the IPM motor 10. Baq and Bad represent the q-axis component and the d-axis component of the armature reaction component Ba, respectively, and represent the ratio (%) of the permanent magnet to the magnetic flux density Bmag when the permanent magnet is at 80 ° C. For example, when energization is performed at | I | = 50% and ∠I = 30 deg, Bad = −1.6% from the map shown in FIG. 9A and Bad = −1.6% from the map shown in FIG. .

  FIGS. 10A and 10B show examples of maps of Baq and Bad with respect to the current | I | flowing through the IPM motor 10 and the conduction angle ∠I, respectively, and one tooth 12a as the magnetic sensor 1 is shown. A search coil 30 wound around is used. Baq and Bad represent the percentage (%) of the permanent magnet component Bmag detected using when the permanent magnet is at 80 ° C.

The gap magnetic flux density Bgap between the rotor 11 and the stator 12 is expressed by the following equation (3) using the q-axis component Baq and the d-axis component Bad of the permanent magnet component Bmag and the armature reaction component Ba.
Bgap = √ {(Bmag + Bad) ² + Baq ² } (3)

  Therefore, based on the current | I | flowing through the IPM motor 10 and the conduction angle ∠I, refer to the maps shown in FIG. 9A, FIG. 9B, or FIG. 10A, FIG. Then, by obtaining Baq and Bad, the permanent magnet component Bmag is obtained from the above equation (3) based on the gap magnetic flux density Bgap measured using the Hall element 20 and the search coil 30 and the obtained Baq and Bad. Can be calculated. The calculation process of the permanent magnet component Bmag is performed by the CPU 2a of the processing device 2.

  An example of the calculation will be described. For easy calculation, the magnetic flux density Bmag when the reference permanent magnet is 80 ° C. is 1 T (Tesla), and the measured air gap magnetic flux density Bgap is 0.9521 T. In this case, if energization is performed with | I | = 50% and ∠I = 30 deg, Baq = 18.5% and Bad = −1.6% as described above, and therefore, Bmag≈0.95 T from the equation (3).

  FIG. 11A shows the use of the above-described maps of Baq and Bad when the Hall element 20 is used as the magnetic sensor 1 and the energization angle is 0 deg and the temperature of the permanent magnet is 20 ° C., 80 ° C., 140 ° C. It is the figure which graphed the calculated | required permanent magnet component Bmag. Moreover, FIG.11 (b) and FIG.11 (c) each represent the result at the conduction angle of 30deg and 60deg. As is clear from FIGS. 11A to 11C, the influence of the armature reaction is almost excluded, and the magnetic flux density of a pure permanent magnet can be obtained.

  FIG. 12 (a) uses the above-described map of Baq and Bad when the search coil 30 is used as the magnetic sensor 1 and the energization angle is 0 ° and the temperature of the permanent magnet is 20 ° C., 80 ° C., and 140 ° C. It is the figure which graphed the calculated | required permanent magnet component Bmag. Moreover, FIG.12 (b) and FIG.12 (c) each represent the result at the conduction angle of 30deg and 60deg. Even when the search coil 30 is used as the magnetic sensor 1, as apparent from FIGS. 12 (a) to 12 (c), the influence of the armature reaction is almost excluded, and the magnetic flux density of a pure permanent magnet is reduced. It has been acquired.

  According to the permanent magnet temperature detecting device of the permanent magnet type rotating machine in the third embodiment, a map of the armature reaction component Ba corresponding to the current flowing through the permanent magnet type rotating machine and the energization angle is prepared in advance. Since the permanent magnet component Bmag is obtained after obtaining the armature reaction component Ba based on this map, it is possible to obtain a highly accurate permanent magnet component Bmag excluding the influence of magnetic saturation. Thereby, the temperature estimation precision of a permanent magnet can be improved.

  The present invention is not limited to the first to third embodiments described above. For example, in the first embodiment, the Hall element 20 is provided at the tip of one tooth 12a of the stator 12, but a recess is provided at the tip of the tooth 12a so that the Hall element 20 is embedded in the recess. Good. FIG. 13 is a diagram illustrating a state in which the Hall element 20 is embedded in a recess 130 provided at the tip of the tooth 12a. Similarly, a search coil can be embedded in the recess. With such a configuration, a Hall element and a search coil can be provided even when the gap length is short. Further, the measurement accuracy of the gap magnetic flux density can be improved as compared with the case where the search coil is wound around the teeth.

  Further, in the concentrated winding motor, a dent may be provided at the tip of the stator teeth as a countermeasure against cogging torque. In this case, a Hall element or a search coil can be embedded in a recess provided in advance. FIG. 14 is a diagram illustrating a state in which the Hall element 20 is embedded in a recess 140 provided for cogging torque countermeasures. If a dent is provided at the tip of the tooth to embed a hall element or the like, the equivalent gap length is slightly increased, so the characteristics may be deteriorated. The problem of deterioration of characteristics does not occur.

  In the third embodiment, it has been described that the map of Baq and Bad corresponding to the current | I | flowing through the IPM motor 10 and the conduction angle ∠I is prepared in advance. However, the d-axis component of the current flowing through the IPM motor 10 is described. Maps of Baq and Bad corresponding to Id and q-axis component Iq may be prepared in advance, or maps corresponding to other parameters may be prepared.

  In a rotating machine that magnetically saturates the bridge portion of the rotor, such as an IPM motor, when the temperature of the permanent magnet changes and the amount of magnetic flux generated by the permanent magnet changes, the saturation degree of the bridge portion changes. Therefore, since the magnetic flux density caused by the armature reaction is affected by the degree of saturation of the bridge, as in the method described in the third embodiment, Baq and Bad with respect to the armature current | I | Even if the map is prepared, an error is included in the magnetic flux density Ba (Baq, Bad) obtained from the map. Therefore, the magnet temperature corresponding to the d-axis component Id, q-axis component Iq, and air gap magnetic flux density | Bgap | of the armature current is obtained by an experiment in advance and mapped, and the obtained Id, Iq and | Bgap | Further, the temperature of the permanent magnet may be obtained based on a map prepared in advance. In this case, more accurate temperature estimation can be performed.

  Although the processing for estimating the temperature of the permanent magnet has been described as being performed by the processing device 2, the processing for estimating the temperature is performed by a general motor control device without providing the processing device 2 for estimating the temperature. You may do it.

  In each of the embodiments described above, the distributed winding IPM motor has been described as an example of the permanent magnet type rotating machine. However, the permanent magnet type rotating machine may be a distributed winding SPM motor shown in FIG. 15 or a concentrated winding shown in FIG. Other types of motors such as a wound IPM motor and a concentrated winding SPM motor shown in FIG. 17 may be used. These motors can be used for vehicles such as electric vehicles, hybrid vehicles, fuel cell vehicles, and systems other than vehicles.

  The correspondence between the constituent elements of the claims and the constituent elements of the first to third embodiments is as follows. That is, the magnetic sensor 1 is a magnetic flux density measuring means, the processing device 2 is an armature reaction magnetic flux density detecting means, a permanent magnet magnetic flux density extracting means, a temperature estimating means, a d-axis current detecting means, and a q-axis current detecting means. The current sensor 3 constitutes armature current detection means, and the memory 2b constitutes data storage means. In addition, the above description is an example to the last, and when interpreting invention, it is not limited to the correspondence of the component of said embodiment and the component of this invention at all.

The figure which shows the whole structure of the temperature detection apparatus of the permanent magnet of the permanent-magnet-type rotary machine in 1st Embodiment. Diagram showing the configuration of the IPM motor The figure which shows the Hall element provided in the front-end | tip of one teeth of a stator 4 (a), 4 (b), and 4 (c) are graphs showing the magnetic flux density values detected by the Hall element when the temperature of the permanent magnet is 20 ° C, 80 ° C, and 140 ° C. Yes, the results are shown when the energization angles are 0 deg, 30 dge, and 60 deg, respectively. 5 (a), 5 (b), and 5 (c) are graphs showing the permanent magnet component Bmag when the temperature of the permanent magnet is 20 ° C, 80 ° C, and 140 ° C. The results are shown when 0 deg, 30 dge, and 60 deg. The figure which shows the search coil wound around one tooth of the stator 7 (a), 7 (b), and 7 (c) are graphs of the air gap magnetic flux density values detected using the search coil when the temperature of the permanent magnet is 20 ° C, 80 ° C, and 140 ° C. It is a figure and represents the result when energization angles are 0 deg, 30 dge, and 60 deg, respectively. 8 (a), 8 (b), and 8 (c) are graphs showing the permanent magnet component Bmag obtained when the temperature of the permanent magnet is 20 ° C., 80 ° C., and 140 ° C., respectively. The results when the angles are 0 deg, 30 dge, and 60 deg are shown. FIGS. 9 (a) and 9 (b) are diagrams showing examples of maps of Baq and Bad with respect to the current flowing through the IPM motor and the conduction angle when a Hall element is used as the magnetic sensor. FIGS. 10A and 10B are diagrams showing examples of maps of Baq and Bad with respect to the current flowing through the IPM motor and the energization angle when a search coil is used as the magnetic sensor. 11 (a), 11 (b), and 11 (c) show a map of Baq and Bad when the temperature of the permanent magnet is 20 ° C., 80 ° C., and 140 ° C. using a Hall element as a magnetic sensor. It is the figure which graphed the permanent magnet component Bmag calculated | required using, and represents the result when the conduction angles are 0 deg, 30 dge, and 60 deg, respectively. 12 (a), 12 (b), and 12 (c) show a map of Baq and Bad when the temperature of the permanent magnet is 20 ° C., 80 ° C., and 140 ° C. using a search coil as a magnetic sensor. It is the figure which graphed the permanent magnet component Bmag calculated | required using, and represents the result when the conduction angles are 0 deg, 30 dge, and 60 deg, respectively. The figure which shows a mode that Hall element was embedded in the dent provided in the tip of teeth. The figure which shows a mode that Hall element was embedded in the dent provided for cogging torque measures Diagram showing the structure of a distributed winding SPM motor Diagram showing the structure of a concentrated winding IPM motor Diagram showing the structure of a concentrated winding SPM motor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Magnetic sensor, 2 ... Processing apparatus, 2a ... CPU, 2b ... Memory, 3 ... Current sensor, 10 ... IPM motor, 11 ... Rotor, 11a-11h ... Permanent magnet, 12 ... Stator, 20 ... Hall element, 30 ... Search coil

Claims (8)

Magnetic flux density measuring means provided on a stator of a permanent magnet type rotating machine using a permanent magnet as a rotor, and measuring a gap magnetic flux density between the rotor and the stator;
Armature reaction magnetic flux density detecting means for detecting magnetic flux density caused by armature reaction (hereinafter referred to as armature reaction magnetic flux density);
By excluding the armature reaction magnetic flux density detected by the armature reaction magnetic flux density detection means from the gap magnetic flux density measured by the magnetic flux density measurement means, the magnetic flux density of the permanent magnet (hereinafter referred to as permanent magnet magnetic flux density) Permanent magnet magnetic flux density extraction means for extracting
And a temperature estimation means for estimating the temperature of the permanent magnet based on the permanent magnet magnetic flux density extracted by the permanent magnet magnetic flux density extraction means. . In the permanent magnet temperature detecting device of the permanent magnet type rotating machine according to claim 1,
Armature current detecting means for detecting an armature current flowing in the permanent magnet type rotating machine,
The armature reaction magnetic flux density detection means calculates the armature reaction magnetic flux density based on the armature current detected by the armature current detection means. Temperature detection device. In the permanent magnet temperature detecting device of the permanent magnet type rotating machine according to claim 1,
Armature current detection means for detecting an armature current flowing in the permanent magnet type rotating machine;
Data storage means for storing data of armature reaction magnetic flux density corresponding to the armature current,
The armature reaction magnetic flux density detection means obtains the armature reaction magnetic flux density based on the armature current detected by the armature current detection means and the data stored in the data storage means. A permanent magnet temperature detecting device for a permanent magnet type rotating machine. Magnetic flux density measuring means provided on a stator of a permanent magnet type rotating machine using a permanent magnet as a rotor, and measuring a gap magnetic flux density between the rotor and the stator;
D-axis current detection means for detecting a d-axis component of the armature current (hereinafter, d-axis current);
Q-axis current detection means for detecting a q-axis component of the armature current (hereinafter referred to as q-axis current);
Data storage means for storing data on the temperature of the permanent magnet according to the magnetic flux density between the rotor and the stator, the d-axis current, and the q-axis current;
The gap magnetic flux density detected by the magnetic flux density measuring means, the d-axis current detected by the d-axis current detecting means, the q-axis current detected by the q-axis current detecting means, and the data storage means are stored. And a temperature estimating means for estimating the temperature of the permanent magnet based on the data of the permanent magnet. In the permanent magnet temperature detecting device of the permanent magnet type rotating machine according to any one of claims 1 to 4,
A temperature detection device for a permanent magnet of a permanent magnet type rotating machine, wherein the magnetic flux density measuring means is provided at a tip of a tooth of a stator of the permanent magnet type rotating machine. In the permanent magnet temperature detecting device of the permanent magnet type rotating machine according to any one of claims 1 to 4,
The magnetic flux density measuring means measures the air gap magnetic flux density by using a search coil wound around one tooth of a stator of the permanent magnet type rotating machine. Magnet temperature detection device. In the permanent magnet temperature detecting device of the permanent magnet type rotating machine according to any one of claims 1 to 4,
A temperature detection device for a permanent magnet of a permanent magnet type rotating machine, wherein a recess is provided at a tip of a tooth of a stator of the permanent magnet type rotating machine, and the magnetic flux density measuring means is embedded in the recess. In the permanent magnet temperature detecting device of the permanent magnet type rotating machine according to any one of claims 1 to 4,
A temperature detection device for a permanent magnet of a permanent magnet type rotating machine, wherein the magnetic flux density measuring means is embedded in a recess provided in advance at a tip of a tooth of a stator of the permanent magnet type rotating machine.

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