Electromagnetic induction type angle and temperature detection system and method for detecting temperature

Abstract

To measure the temperature of an electromagnetic induction type angle detector without requiring complex calculations or external resistors.SOLUTION: The electromagnetic induction type angle and temperature detection system includes: an electromagnetic induction type angle detector (10) including a rotor and a stator around which an excitation winding (11), an output winding (12), and a detection winding (13) are wound; an excitation signal generation unit (110) for supplying an excitation signal to the excitation winding (11); an angle conversion unit (120) for obtaining a rotation angle of the rotor by processing an output signal obtained from the output winding (12); a measurement unit (130) for measuring a correlation between a detection signal obtained from the detection winding (13) and the excitation signal; and a temperature calculation unit (150) for calculating the temperature of the electromagnetic induction type angle detector (10) on the basis of the correlation, the detection winding (13) being wound around the stator so as to be magnetically coupled with the excitation winding (11).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electromagnetic induction angle temperature detection system and a temperature detection method. [Background technology]

[0002] Various proposals have been made in response to requests for temperature measurement of electromagnetic induction angle detectors such as resolvers. In Patent Document 1 below, a Lissajous curve is generated from a signal obtained from a resolver, and the temperature of the resolver is detected using the radius value of the Lissajous curve. In Patent Document 2 below, a resistor is inserted in series with the excitation coil of the resolver, and the excitation voltage phase and excitation current phase are measured using the resistor, and the temperature is measured by detecting the temperature change in the phase difference. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-214969 [Patent Document 2] Japanese Patent Application Publication No. 2016-161332 Summary of the Invention [Problem to be solved by the invention]

[0004] The temperature measurement method disclosed in Patent Document 1 requires the execution of complex calculations, and requires a high-resolution AD converter, a multiplication circuit, and the like. In the temperature measurement method disclosed in Patent Document 2, a resistor is connected to the excitation coil, which may affect the excitation signal and, as a result, the accuracy of angle detection. Also, if the impedance of the winding is originally small, the value of the inserted resistor must also be small, which poses a problem of reduced accuracy in temperature detection.

[0005] For this reason, there is a demand for a method for measuring the temperature of an electromagnetic induction type angle detector without requiring complex calculations or external resistors. In order to solve the above problems, the present invention aims to provide an electromagnetic induction type angle temperature detection system and a temperature detection method that can measure the temperature of an electromagnetic induction type angle detector without requiring complex calculations or external resistors, etc. [Means for solving the problem]

[0006] The electromagnetic induction type angle and temperature detection system of the present invention comprises an electromagnetic induction type angle detector having a rotor and a stator, with an excitation winding, an output winding, and a detection winding wound around the stator; an excitation signal generation unit that supplies an excitation signal to the excitation winding; an angle conversion unit that determines the rotation angle of the rotor by processing the output signal obtained from the output winding; a measurement unit that measures the correspondence between the detection signal obtained from the detection winding and the excitation signal; and a temperature calculation unit that calculates the temperature of the electromagnetic induction type angle detector from the correspondence, wherein the detection winding is wound around the stator so as to be magnetically coupled to the excitation winding.

[0007] In the electromagnetic induction angle temperature detection system according to the present invention, the detection winding may be wound in the same slot as the slot of the stator in which the excitation winding is wound.

[0008] In the electromagnetic induction type angle temperature detection system according to the present invention, when the excitation winding is wound in a plurality of slots, the detection winding may be wound in at least one of the plurality of slots in which the excitation winding is wound.

[0009] The electromagnetic induction type angle temperature detection system according to the present invention may further include a memory unit that stores a table having temperature data according to the correspondence relationship, and the temperature calculation unit may refer to the table and calculate the temperature of the electromagnetic induction type angle detector based on the correspondence relationship between the excitation signal and the detection signal.

[0010] In the electromagnetic induction type angle temperature detection system according to the present invention, the measurement unit may include a phase difference measurement unit that measures any one of the following as a correspondence relationship: the phase difference between the voltage of the excitation signal and the voltage of the detection signal, the phase difference between the current of the excitation signal and the current of the detection signal, the phase difference between the current of the excitation signal and the voltage of the detection signal, or the phase difference between the voltage of the excitation signal and the current of the detection signal.

[0011] In the electromagnetic induction type angle temperature detection system according to the present invention, when the detection winding is not wound in the slot where the excitation winding is wound, or when the stator does not have a slot, the excitation winding and the detection winding may be arranged in spatial positions where they are magnetically coupled to each other.

[0012] In the electromagnetic induction type angle temperature detection system according to the present invention, the measurement unit may include a signal ratio measurement unit that measures any one of the following as a correspondence relationship: the ratio between the voltage of the excitation signal and the voltage of the detection signal, the ratio between the current of the excitation signal and the current of the detection signal, the ratio between the current of the excitation signal and the voltage of the detection signal, or the ratio between the voltage of the excitation signal and the current of the detection signal.

[0013] In the electromagnetic induction type angle temperature detection system according to the present invention, the measurement unit may include an impedance measurement unit that measures the impedance of the excitation winding and the impedance of the detection winding, and measures the ratio between the impedance of the excitation winding and the impedance of the detection winding as a correspondence relationship.

[0014] In the electromagnetic induction type angle temperature detection system according to the present invention, the impedance measurement unit may measure the impedance of the excitation winding and the impedance of the output winding at a timing when no excitation signal is supplied to the excitation winding.

[0015] A temperature detection method according to the present invention is a temperature detection method for calculating the temperature of an electromagnetic induction angle detector in an electromagnetic induction angle temperature detection system comprising: an electromagnetic induction angle detector having a rotor and a stator, wherein an excitation winding, an output winding, and a detection winding are wound around the stator, and the detection winding is wound around the stator so as to be magnetically coupled to the excitation winding; an excitation signal generation unit that supplies an excitation signal to the excitation winding; an angle conversion unit that determines the rotation angle of the rotor by processing the output signal obtained from the output winding; a measurement unit that measures the correspondence between the detection signal obtained from the detection winding and the excitation signal; and a temperature calculation unit that calculates the temperature of the electromagnetic induction angle detector from the correspondence relationship, wherein the measurement unit measures any one of the phase difference between the excitation signal and the detection signal, the signal ratio between the excitation signal and the detection signal, and the ratio between the impedance of the excitation winding and the impedance of the detection winding as the correspondence relationship, and the temperature calculation unit calculates the temperature of the electromagnetic induction angle detector from the correspondence relationship.

[0016] In the temperature detection method according to the present invention, the electromagnetic induction type angle temperature detection system may further be provided with a memory unit that stores a table having temperature data according to the correspondence relationship, and the temperature calculation unit may calculate the temperature of the electromagnetic induction type angle detector by referring to the table.

[0017] In the temperature detection method according to the present invention, the measurement unit may measure the impedance of the excitation winding and the impedance of the detection winding at a timing when no excitation signal is supplied from the excitation signal generation unit to the excitation winding. [Effects of the Invention]

[0018] According to the electromagnetic induction type angle temperature detection system and temperature detection method of the present invention, a detection winding is provided on the stator so as to be magnetically coupled to the excitation winding of the electromagnetic induction type angle detector, and the temperature of the electromagnetic induction type angle detector can be calculated based on the correspondence between the detection signal obtained by the detection winding and the excitation signal generated by the excitation signal generation unit. Therefore, it is possible to measure the temperature of the electromagnetic induction type angle detector without requiring complicated calculations or external resistors. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a configuration diagram showing a configuration of an electromagnetic induction type angle temperature detection system according to a first embodiment of the present invention. [Figure 2] FIG. 3 is a configuration diagram showing another configuration of the electromagnetic induction type angle temperature detection system according to the first embodiment of the present invention. [Figure 3] FIG. 10 is a configuration diagram showing the configuration of an electromagnetic induction type angle temperature detection system according to a second embodiment of the present invention. [Figure 4] FIG. 10 is a configuration diagram showing the configuration of an electromagnetic induction type angle temperature detection system according to a third embodiment of the present invention. [Figure 5] FIG. 10 is a configuration diagram showing the configuration of an electromagnetic induction type angle temperature detection system according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electromagnetic induction type angle temperature detection system and a temperature detection method according to embodiments of the present invention will be described with reference to the accompanying drawings.

[0021] Embodiment 1 First, the configuration of an electromagnetic induction type angle temperature detection system 1 according to a first embodiment of the present invention will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a configuration diagram showing the configuration of the electromagnetic induction type angle temperature detection system 1 according to the first embodiment of the present invention. Fig. 2 is a configuration diagram showing another configuration of the electromagnetic induction type angle temperature detection system 1 according to the first embodiment of the present invention.

[0022] [Configuration of Electromagnetic Induction Type Angle Temperature Detection System 1 of Embodiment 1] In FIG. 1, an electromagnetic induction type angle temperature detection system 1 is mainly provided with an electromagnetic induction type angle detector 10 and an angle temperature detection device 100.

[0023] The electromagnetic induction type angle detector 10 is provided with an excitation winding 11, an output winding 12, and a detection winding 13.

[0024] The excitation winding 11 is wound around slots in a stator (not shown). The excitation winding 11 is exemplified as one in which the excitation signal has one phase, but the excitation signal may have two phases. R1 and R2 in FIG. 1 are end portions of the excitation winding 11. A signal line that supplies an excitation signal from an excitation signal generating unit 110 is connected to the end portions R1 and R2.

[0025] The output winding 12 is wound in a slot different from that of the excitation winding in a stator (not shown). The output winding 12 shown in FIG. 1 is a two-phase winding. S1 and S3 in FIG. 1 are first-phase ends of the output winding 12, and S2 and S4 are second-phase ends of the output winding 12. A signal line on the input side of the angle conversion unit 120 is connected to the ends S1 to S4. That is, the output signal obtained by the output winding 12 is supplied to the angle conversion unit 120.

[0026] The detection winding 13 is wound around a slot in a stator (not shown) so as to be magnetically coupled to the excitation winding 11. P1 and P2 in FIG. 1 are ends of the detection winding 13. A signal line on the input side of the measurement unit 130 is connected to the ends P1 and P2. That is, the detection signal obtained by the detection winding 13 is supplied to the measurement unit 130.

[0027] Here, the detection winding 13 only needs to be wound in the same slot as the excitation winding 11 so as to be magnetically coupled to the excitation winding 11. Furthermore, if the excitation winding 11 has multiple slots, the detection winding 13 only needs to be wound in or magnetically coupled to at least one of the multiple slots so as to be magnetically coupled to the excitation winding 11. There are no particular limitations on the number of turns and wire diameter of the excitation winding 11 and the detection winding 13.

[0028] The angle temperature detection device 100 mainly includes an excitation signal generation unit 110, an angle conversion unit 120, a measurement unit 130, a storage unit 140, and a temperature calculation unit 150.

[0029] The excitation signal generating unit 110 generates an excitation signal and supplies the generated excitation signal to the excitation winding 11 of the electromagnetic induction type angle detector 10 and the angle converting unit 120 . The excitation signal generating unit 110 also supplies the generated excitation signal to the measuring unit 130. If the excitation winding 11 has two phases, the excitation signal generating unit 110 generates two-phase excitation signals and supplies them to the excitation winding 11.

[0030] The angle conversion unit 120 performs digital arithmetic processing on the output signal output from the output winding 12 of the electromagnetic induction type angle detector 10, and outputs the angle Φ, or the angle Φ and the angular velocity ω. Here, the explanation will continue for the case where the angle Φ is output from the angle conversion unit 120.

[0031] The measurement unit 130 measures the correspondence relationship between the detection signal obtained by the detection winding 13 and the excitation signal, and supplies the measured correspondence relationship to the temperature calculation unit 150. In Fig. 1, the measurement unit 130 includes a phase difference measurement unit 131. The phase difference measurement unit 131 measures the correspondence relationship regarding the phase difference between the excitation signal and the detection signal.

[0032] The following describes the correspondence relationship measured by the phase difference measurement unit 131. The phase difference measurement unit 131 measures any one of the following as the correspondence relationship between the excitation signal and the detection signal: the phase difference between the voltage of the excitation signal and the voltage of the detection signal, the phase difference between the current of the excitation signal and the current of the detection signal, the phase difference between the current of the excitation signal and the voltage of the detection signal, or the phase difference between the voltage of the excitation signal and the current of the detection signal. If it is difficult for the phase difference measurement unit 131 to measure the current of the excitation signal, as shown in FIG. 2, a command value for the current of the excitation signal can be obtained from the excitation signal generation unit 110, and the current of the excitation signal can be measured instead.

[0033] The storage unit 140 stores a table containing temperature data corresponding to the correspondence relationship regarding the phase difference between the excitation signal and the detection signal. This table is in the form of a look-up table or the like, and is generated based on values ​​obtained in measurements before the product is shipped.

[0034] The temperature calculation unit 150 refers to a table stored in the storage unit 140 and calculates the temperature of the electromagnetic induction type angle detector 10 based on the correspondence relationship regarding the phase difference between the excitation signal and the detection signal obtained by the measurement unit 130.

[0035] The relationship between the phase difference between the excitation signal and the detection signal and the temperature of the electromagnetic induction type angle detector 10 will be described below. The excitation winding 11 and the detection winding 13 each have components of L, C, and R. Furthermore, the magnetic coupling between the excitation winding 11 and the detection winding 13 also has components of L, C, and R. Then, affected by temperature changes in the electromagnetic induction type angle detector 10, the components of L, C, and R of the excitation winding 11 and the detection winding 13 vary. The phase difference between the excitation signal and the detection signal changes due to such fluctuations in the L, C, and R components of the excitation winding 11 and the detection winding 13. That is, the phase difference between the excitation signal and the detection signal changes in response to temperature changes in the electromagnetic induction type angle detector 10. Therefore, a table containing temperature data corresponding to the correspondence relationship regarding the phase difference between the excitation signal and the detection signal can be generated in advance.

[0036] [Operation of the electromagnetic induction type angle temperature detection system 1 according to the first embodiment] Angle detection The excitation signal generation unit 110 supplies an excitation signal to the excitation winding 11 of the electromagnetic induction type angle detector 10. At this time, an output signal generated in the output winding 12 is supplied to the angle conversion unit 120. The angle conversion unit 120 performs arithmetic processing on the output signal output from the output winding 12 of the electromagnetic induction type angle detector 10, and outputs an angle Φ, or an angle Φ and an angular velocity ω.

[0037] Temperature detection The detection winding 13 is wound around the slot so as to be magnetically coupled to the excitation winding 11, and therefore a detection signal that corresponds to the excitation signal can be obtained. The detection signal generated in the detection winding 13 at this time is supplied to the measurement unit 130. The excitation signal from the excitation signal generation unit 110 is also supplied to the measurement unit 130. First, the phase difference measurement unit 131 in the measurement unit 130 measures the phase difference between the excitation signal and the detection signal obtained by the detection winding 13 as the correspondence between the detection signal and the excitation signal, and supplies the measured correspondence to the temperature calculation unit 150. The temperature calculation unit 150 refers to the table in the storage unit 140 according to the correspondence relationship regarding the phase difference between the excitation signal and the detection signal measured by the phase difference measurement unit 131, and applies the correspondence relationship to the table, thereby being able to calculate the corresponding temperature as the temperature T of the electromagnetic induction type angle detector 10. The temperature calculation unit 150 outputs the calculated temperature T to the outside.

[0038] [Effects obtained by the first embodiment] According to the electromagnetic induction type angle temperature detection system 1 and the temperature detection method described in the first embodiment, the following effects can be obtained.

[0039] The electromagnetic induction type angle and temperature detection system 1 of the first embodiment includes an electromagnetic induction type angle detector 10 having a rotor and a stator, with an excitation winding 11, an output winding 12, and a detection winding 13 wound in slots of the stator, an excitation signal generation unit 110 that supplies an excitation signal to the excitation winding 11, an angle conversion unit 120 that determines the rotation angle of the rotor by processing an output signal obtained from the output winding 12, a measurement unit 130 that measures the correspondence between the detection signal obtained from the detection winding 13 and the excitation signal, and a temperature calculation unit 150 that calculates the temperature of the electromagnetic induction type angle detector 10 from the correspondence. Here, the detection winding 13 is wound in the slot so as to be magnetically coupled to the excitation winding 11. In this way, in the electromagnetic induction type angle and temperature detection system 1 and temperature detection method of embodiment 1, the detection winding 13 is provided in the slot so as to be magnetically coupled to the excitation winding 11 of the electromagnetic induction type angle detector 10, and by measuring the correspondence between the detection signal obtained by the detection winding 13 and the excitation signal generated by the excitation signal generating unit 110, the temperature T of the electromagnetic induction type angle detector 10 can be calculated from the correspondence. Therefore, according to the electromagnetic induction type angle temperature detection system 1 and temperature detection method of embodiment 1, a simple two-step process is sufficient, namely, measuring the correspondence relationship related to the phase difference and referencing a table, and therefore it is possible to measure the temperature T of the electromagnetic induction type angle detector 10 without requiring complex calculations or external resistors, etc.

[0040] In the electromagnetic induction type angle temperature detection system 1 of the first embodiment, the detection winding 13 is wound in the same slot as the excitation winding 11. Therefore, the correspondence between the detection signal obtained by the detection winding 13 and the excitation signal can be accurately measured.

[0041] In the electromagnetic induction type angle temperature detection system 1 of the first embodiment, when the excitation winding 11 is wound around a plurality of slots, the detection winding 13 is wound so as to be magnetically coupled to at least one of the plurality of slots around which the excitation winding 11 is wound. This makes it possible to accurately measure the correspondence between the detection signal obtained by the detection winding 13 and the excitation signal.

[0042] The electromagnetic induction type angle and temperature detection system 1 of the first embodiment further includes a storage unit 140 that stores a table having temperature data corresponding to the correspondence relationships. The temperature calculation unit 150 refers to the table and calculates the temperature T of the electromagnetic induction type angle detector 10 based on the correspondence relationships between the excitation signals and the detection signals. Therefore, the temperature T of the electromagnetic induction type angle detector 10 can be accurately and quickly detected based on the correspondence relationships between the detection signals obtained by the detection winding 13 and the excitation signals.

[0043] In the electromagnetic induction type angle temperature detection system 1 of the first embodiment, the measurement unit 130 is provided with a phase difference measurement unit 131. The phase difference measurement unit 131 measures any one of the phase difference between the voltage of the excitation signal and the voltage of the detection signal, the phase difference between the current of the excitation signal and the current of the detection signal, the phase difference between the current of the excitation signal and the voltage of the detection signal, or the phase difference between the voltage of the excitation signal and the current of the detection signal as a correspondence relationship. Therefore, the temperature T of the electromagnetic induction type angle detector 10 can be detected accurately and quickly from the correspondence relationship regarding the phase difference between the detection signal obtained by the detection winding 13 and the excitation signal.

[0044] In the first embodiment, the excitation winding 11 and the detection winding 13 are wound around slots in a stator (not shown), but as long as the excitation winding 11 and the detection winding 13 are magnetically coupled, they may be provided in a stator that does not have slots for an eddy current sensor or the like. That is, in the electromagnetic induction type angle temperature detection system 1 of the first embodiment, when the detection winding 13 is not wound in the slot where the excitation winding 11 is wound, or when the stator does not have a slot, the excitation winding 11 and the detection winding 13 are arranged in spatial positions where they are magnetically coupled to each other. Therefore, even when a stator without a slot is used, the same effect as in the first embodiment can be obtained.

[0045] Embodiment 2 The configuration of the electromagnetic induction type angle temperature detection system 1 according to the second embodiment of the present invention will be described with reference to Fig. 3. Fig. 3 is a configuration diagram showing the configuration of the electromagnetic induction type angle temperature detection system 1 according to the second embodiment of the present invention. In Fig. 3, the same components as those in Figs. 1 and 2 already described are given the same numbers to avoid redundant explanation, and the following description will focus on the different parts.

[0046] [Configuration of Electromagnetic Induction Type Angle Temperature Detection System 1 of Embodiment 2] In FIG. 3, the electromagnetic induction type angle temperature detection system 1 is mainly provided with an electromagnetic induction type angle detector 10 and an angle temperature detection device 100.

[0047] The electromagnetic induction type angle detector 10 is the same as in the first embodiment. The angle and temperature detection device 100 includes an excitation signal generation unit 110, an angle conversion unit 120, a measurement unit 130, a storage unit 140, and a temperature calculation unit 150. The measurement unit 130 includes a signal ratio measurement unit 132. The signal ratio measurement unit 132 measures the correspondence relationship between the excitation signal and the detection signal in terms of the signal ratio.

[0048] The following describes the correspondence relationship measured by the signal ratio measurement unit 132. The signal ratio measurement unit 132 measures any one of the ratio between the voltage of the excitation signal and the voltage of the detection signal, the ratio between the current of the excitation signal and the current of the detection signal, the ratio between the current of the excitation signal and the voltage of the detection signal, or the ratio between the voltage of the excitation signal and the current of the detection signal as the correspondence relationship related to the signal ratio between the excitation signal and the detection signal. If it is difficult for the signal ratio measurement unit 132 to measure the current of the excitation signal, the signal ratio measurement unit 132 can obtain a command value for the current of the excitation signal from the excitation signal generation unit 110 as shown in FIG. 2 of the first embodiment, and measure the current of the excitation signal instead.

[0049] The storage unit 140 stores a table containing temperature data corresponding to the correspondence relationship regarding the signal ratio between the excitation signal and the detection signal. This table is in the form of a look-up table or the like, and is generated based on values ​​obtained in measurements before the product is shipped.

[0050] The temperature calculation unit 150 refers to a table stored in the memory unit 140 and calculates the temperature of the electromagnetic induction type angle detector 10 based on the correspondence relationship regarding the signal ratio between the excitation signal and the detection signal obtained by the measurement unit 130.

[0051] The correspondence relationship regarding the signal ratio between the excitation signal and the detection signal and the relationship with the temperature of the electromagnetic induction type angle detector 10 will be described below. The excitation winding 11 and the detection winding 13 each have components of L, C, and R. Furthermore, the magnetic coupling between the excitation winding 11 and the detection winding 13 also has components of L, C, and R. Then, affected by temperature changes in the electromagnetic induction type angle detector 10, the components of L, C, and R of the excitation winding 11 and the detection winding 13 vary. The signal ratio between the excitation signal and the detection signal changes due to such fluctuations in the L, C, and R components of the excitation winding 11 and the detection winding 13. That is, the signal ratio between the excitation signal and the detection signal changes in response to temperature changes in the electromagnetic induction type angle detector 10. Therefore, a table containing temperature data corresponding to the correspondence relationship regarding the signal ratio between the excitation signal and the detection signal can be generated in advance.

[0052] [Temperature detection operation according to the second embodiment] The detection winding 13 is wound in the slot of the stator so as to be magnetically coupled to the excitation winding 11, and therefore a detection signal having a corresponding relationship with the excitation signal can be obtained. The detection signal generated in the detection winding 13 at this time is supplied to the measurement unit 130. The excitation signal from the excitation signal generation unit 110 is also supplied to the measurement unit 130. First, the signal ratio measurement unit 132 in the measurement unit 130 measures the signal ratio between the excitation signal and the detection signal as the correspondence between the detection signal and the excitation signal obtained in the detection winding 13, and supplies the measured correspondence to the temperature calculation unit 150. The temperature calculation unit 150 refers to the table in the storage unit 140 according to the correspondence relationship regarding the signal ratio between the excitation signal and the detection signal measured by the signal ratio measurement unit 132, and applies the correspondence relationship to the table, thereby being able to calculate the corresponding temperature as the temperature T of the electromagnetic induction type angle detector 10. The temperature calculation unit 150 outputs the calculated temperature T to the outside.

[0053] [Effects obtained by the second embodiment] In the electromagnetic induction type angle temperature detection system 1 of the second embodiment, the measurement unit 130 is provided with a signal ratio measurement unit 132. In the electromagnetic induction type angle temperature detection system 1 and temperature detection method of embodiment 2, the signal ratio measurement unit 132 measures any one of the following as a correspondence relationship related to the signal ratio between the excitation signal and the detection signal: a ratio between the voltage of the excitation signal and the voltage of the detection signal, a ratio between the current of the excitation signal and the current of the detection signal, a ratio between the current of the excitation signal and the voltage of the detection signal, or a ratio between the voltage of the excitation signal and the current of the detection signal. The temperature calculation unit 150 calculates the temperature T of the electromagnetic induction type angle detector 10 from the correspondence relationship. Therefore, according to the electromagnetic induction type angle temperature detection system 1 and temperature detection method of embodiment 2, a simple two-step process is sufficient, namely, measuring the correspondence relationship regarding the signal ratio and referencing a table, and therefore the temperature T of the electromagnetic induction type angle detector 10 can be detected accurately and quickly without requiring complex calculations or external resistors, etc.

[0054] Embodiment 3 The configuration of the electromagnetic induction type angle temperature detection system 1 according to the third embodiment of the present invention will be described with reference to Fig. 4. Fig. 4 is a configuration diagram showing the configuration of the electromagnetic induction type angle temperature detection system 1 according to the third embodiment of the present invention. In Fig. 4, the same components as those in Figs. 1 to 3 already described are given the same numbers to avoid redundant explanation, and the description will focus on the different parts.

[0055] [Configuration of Electromagnetic Induction Type Angle Temperature Detection System 1 of Embodiment 3] In FIG. 4, the electromagnetic induction type angle temperature detection system 1 is mainly provided with an electromagnetic induction type angle detector 10 and an angle temperature detection device 100.

[0056] The electromagnetic induction type angle detector 10 is the same as in the first and second embodiments. The angle and temperature detection device 100 includes an excitation signal generation unit 110, an angle conversion unit 120, a measurement unit 130, a storage unit 140, and a temperature calculation unit 150. The measurement unit 130 includes an impedance measurement unit 133. The impedance measurement unit 133 measures the impedance of the excitation winding 11 and the impedance of the detection winding 13, and measures the ratio between the impedance of the excitation winding 11 and the impedance of the detection winding 13 as a correspondence relationship.

[0057] The impedance measurement unit 133 applies a reference signal of a predetermined frequency and voltage to the excitation winding 11 and the detection winding 13, and calculates the impedance from the current that flows at that time. Therefore, the impedance measurement unit 133 measures the impedance of the excitation winding 11 and the impedance of the detection winding 13 at a timing when no excitation signal is supplied to the excitation winding 11 and angle detection is paused.

[0058] The storage unit 140 stores a table containing temperature data corresponding to the correspondence relationship regarding the ratio between the impedance of the excitation winding 11 and the impedance of the detection winding 13. This table is in the form of a look-up table or the like, and is generated based on values ​​obtained in measurements before product shipment.

[0059] The temperature calculation unit 150 refers to a table stored in the memory unit 140 and calculates the temperature of the electromagnetic induction type angle detector 10 based on the correspondence relationship regarding the ratio between the impedance of the excitation winding 11 and the impedance of the detection winding 13 obtained by the measurement unit 130.

[0060] The relationship between the ratio of the impedance of the excitation winding 11 to the impedance of the detection winding 13 and the temperature of the electromagnetic induction type angle detector 10 will be described below. The excitation winding 11 and the detection winding 13 each have components of L, C, and R. Furthermore, the magnetic coupling between the excitation winding 11 and the detection winding 13 also has components of L, C, and R. Then, affected by temperature changes in the electromagnetic induction type angle detector 10, the components of L, C, and R of the excitation winding 11 and the detection winding 13 vary. Such variations in the L, C, and R components of the excitation winding 11 and the detection winding 13 change the ratio of the impedance of the excitation winding 11 to the impedance of the detection winding 13. In other words, the ratio of the impedance of the excitation winding 11 to the impedance of the detection winding 13 changes in accordance with changes in the temperature of the electromagnetic induction type angle detector 10. Therefore, a table containing temperature data corresponding to the correspondence relationship regarding the ratio between the impedance of the excitation winding 11 and the impedance of the detection winding 13 can be generated in advance.

[0061] [Temperature detection operation according to the third embodiment] First, the impedance measurement unit 133 in the measurement unit 130 measures the ratio between the impedance of the excitation winding 11 and the impedance of the detection winding 13, and supplies the measured impedance ratio to the temperature calculation unit 150 as a correspondence relationship. The temperature calculation unit 150 refers to the table in the storage unit 140 according to the correspondence relationship related to the impedance ratio, and applies the correspondence relationship to the table, thereby calculating the corresponding temperature as the temperature T of the electromagnetic induction type angle detector 10. The temperature calculation unit 150 outputs the calculated temperature T to the outside.

[0062] [Effects obtained by the third embodiment] In the electromagnetic induction type angle temperature detection system 1 of the third embodiment, the measurement unit 130 is provided with an impedance measurement unit 133. As described above, in the electromagnetic induction type angle and temperature detection system 1 and temperature detection method of the third embodiment, the impedance measurement unit 133 measures the ratio between the impedance of the excitation winding 11 and the impedance of the detection winding 13, and supplies the measured impedance ratio as a correspondence relationship to the temperature calculation unit 150. The temperature calculation unit 150 calculates the temperature T of the electromagnetic induction type angle detector 10 from the correspondence relationship. Therefore, according to the electromagnetic induction type angle temperature detection system 1 and temperature detection method of embodiment 3, a simple two-step process is sufficient, namely, measuring the correspondence relationship related to the impedance ratio and referencing a table, and therefore the temperature T of the electromagnetic induction type angle detector 10 can be detected accurately and quickly without requiring complex calculations or external resistors, etc.

[0063] In the electromagnetic induction type angle temperature detection system 1 of the third embodiment, the impedance measurement unit 133 measures the impedance of the excitation winding 11 and the impedance of the detection winding 13 at a timing when no excitation signal is supplied to the excitation winding 11. Therefore, the impedance measuring unit 133 applies a reference signal of a predetermined frequency and voltage to the excitation winding 11 and the detection winding 13, and can reliably and accurately calculate the impedance from the current that flows at that time.

[0064] Embodiment 4 The configuration of the electromagnetic induction type angle temperature detection system 1 according to the fourth embodiment of the present invention will be described with reference to Fig. 5. Fig. 5 is a configuration diagram showing the configuration of the electromagnetic induction type angle temperature detection system 1 according to the fourth embodiment of the present invention. In Fig. 4, the same components as those in Figs. 1 to 4 already described are given the same numbers to avoid redundant explanation, and the description will focus on the different parts.

[0065] [Configuration of Electromagnetic Induction Type Angle Temperature Detection System 1 of Embodiment 4] In FIG. 5, the basic configuration of the electromagnetic induction type angle temperature detection system 1 is the same as that in FIGS. The measurement unit 130 includes a phase difference measurement unit 131, a signal ratio measurement unit 132, and an impedance measurement unit 133. The phase difference measurement unit 131 measures the correspondence relationship regarding the phase difference between the excitation signal and the detection signal. The signal ratio measurement unit 132 measures the correspondence relationship regarding the signal ratio between the excitation signal and the detection signal. The impedance measurement unit 133 measures the ratio between the impedance of the excitation winding 11 and the impedance of the detection winding 13 as the correspondence relationship.

[0066] [Temperature detection operation according to the fourth embodiment] In the fourth embodiment, the temperature calculation unit 150 may refer to the table in the storage unit 140 and calculate the temperature T of the electromagnetic induction type angle detector 10 based on the correspondence relationship measured earliest by the phase difference measurement unit 131, the signal ratio measurement unit 132, and the impedance measurement unit 133. In this case, temperature detection can be performed quickly.

[0067] Furthermore, in the fourth embodiment, the temperature calculation unit 150 may calculate the temperature T1 by referring to the table in the storage unit 140 based on the correspondence relationship in the phase difference measurement unit 131, the temperature calculation unit 150 may calculate the temperature T2 by referring to the table in the storage unit 140 based on the correspondence relationship in the signal ratio measurement unit 132, and the temperature calculation unit 150 may calculate the temperature T3 by referring to the table in the storage unit 140 based on the correspondence relationship in the impedance measurement unit 133, and the temperature at which two or more of T1, T2, and T3 match may be calculated as the temperature T of the electromagnetic induction type angle detector 10. Alternatively, the average of T1, T2, and T3 may be calculated as the temperature T of the electromagnetic induction type angle detector 10. In this case, temperature detection with little error can be performed.

[0068] [Effects Obtained by the Fourth Embodiment] In the electromagnetic induction type angle temperature detection system 1 of the fourth embodiment, the measurement unit 130 is provided with a phase difference measurement unit 131, a signal ratio measurement unit 132, and an impedance measurement unit 133. Therefore, in the electromagnetic induction type angle temperature detection system 1 and the temperature detection method of the fourth embodiment, the temperature calculation unit 150 can calculate the temperature T1 by referring to the table in the memory unit 140 based on the correspondence relationship in the phase difference measurement unit 131, the temperature calculation unit 150 can calculate the temperature T2 by referring to the table in the memory unit 140 based on the correspondence relationship in the signal ratio measurement unit 132, and the temperature calculation unit 150 can calculate the temperature T3 by referring to the table in the memory unit 140 based on the correspondence relationship in the impedance measurement unit 133. Then, depending on how the temperatures T1, T2, and T3 detected based on the three correspondence relationships are used, the temperature T of the electromagnetic induction type angle detector 10 can be calculated quickly and with a small error. Therefore, according to the electromagnetic induction type angle temperature detection system 1 and temperature detection method of embodiment 4, it is only necessary to perform three types of simple two-step processing, namely, measuring the correspondence relationship and referencing the table, and therefore the temperature T of the electromagnetic induction type angle detector 10 can be detected accurately and quickly without requiring complex calculations or external resistors, etc. [Explanation of symbols]

[0069] 1 Electromagnetic induction angle temperature detection system, 10 Electromagnetic induction angle detector, 11 Excitation winding, 12 Output winding, 13 Detection winding, 100 Angle temperature detection device, 110 Excitation signal generation unit, 120 Angle conversion unit, 130 Measurement unit, 131 Phase difference measurement unit, 132 Signal ratio measurement unit, 133 Impedance measurement unit, 140 Memory unit, 150 Temperature calculation unit, P1, P2, R1, R2, S1, S2, S3, S4 Ends.

Claims

1. an electromagnetic induction angle detector (10) comprising a rotor and a stator, the stator being wound with an excitation winding (11), an output winding (12), and a detection winding (13); an excitation signal generating unit (110) that supplies an excitation signal to the excitation winding (11); an angle conversion unit (120) for determining the rotation angle of the rotor by processing an output signal obtained from the output winding (12); a measuring unit (130) for measuring the correspondence between the detection signal obtained by the detection winding (13) and the excitation signal; a temperature calculation unit (150) that calculates the temperature of the electromagnetic induction type angle detector (10) based on the correspondence relationship; The detection winding (13) is wound around the stator so as to be magnetically coupled to the excitation winding (11). Electromagnetic induction angle temperature detection system.

2. The detection winding (13) is wound in the same slot of the stator as the slot in which the excitation winding (11) is wound.

2. The electromagnetic induction angle temperature detection system according to claim 1.

3. When the excitation winding (11) is wound in a plurality of slots, the detection winding (13) is wound in at least one of the plurality of slots in which the excitation winding (11) is wound.

2. The electromagnetic induction angle temperature detection system according to claim 1.

4. a storage unit (140) that stores a table having data of the temperature according to the correspondence relationship; The temperature calculation unit (150) refers to the table and calculates the temperature of the electromagnetic induction type angle detector (10) based on the correspondence between the excitation signal and the detection signal.

2. The electromagnetic induction angle temperature detection system according to claim 1.

5. The measuring unit (130) The correspondence is determined as any one of the phase difference between the voltage of the excitation signal and the voltage of the detection signal, the phase difference between the current of the excitation signal and the current of the detection signal, the phase difference between the current of the excitation signal and the voltage of the detection signal, or the phase difference between the voltage of the excitation signal and the current of the detection signal. A phase difference measurement unit (131) is provided to measure the phase difference.

2. The electromagnetic induction angle temperature detection system according to claim 1.

6. 2. The electromagnetic induction angle temperature detection system according to claim 1, wherein the excitation winding (11) and the detection winding (13) are arranged at spatial positions where they are magnetically coupled to each other when the detection winding (13) is not wound in the slot where the excitation winding (11) is wound, or when the stator does not have a slot.

7. The measuring unit (130) a signal ratio measurement unit (132) that measures, as the correspondence relationship, one of a ratio between the voltage of the excitation signal and the voltage of the detection signal, a ratio between the current of the excitation signal and the current of the detection signal, a ratio between the current of the excitation signal and the voltage of the detection signal, or a ratio between the voltage of the excitation signal and the current of the detection signal; 2. The electromagnetic induction angle temperature detection system according to claim 1.

8. The measuring unit (130) and an impedance measuring unit (133) that measures the impedance of the excitation winding (11) and the impedance of the detection winding (13) and measures the ratio between the impedance of the excitation winding (11) and the impedance of the detection winding (13) as the correspondence relationship.

2. The electromagnetic induction angle temperature detection system according to claim 1.

9. The impedance measurement unit (133) measures the impedance of the excitation winding (11) and the impedance of the detection winding (13) at a timing when the excitation signal is not supplied to the excitation winding (11).

9. The electromagnetic induction angle temperature detection system according to claim 8.

10. an electromagnetic induction angle detector (10) comprising a rotor and a stator, wherein an excitation winding (11), an output winding (12), and a detection winding (13) are wound around the stator, and the detection winding (13) is wound around the stator so as to be magnetically coupled to the excitation winding (11); an excitation signal generating unit (110) that supplies an excitation signal to the excitation winding (11); an angle conversion unit (120) for determining the rotation angle of the rotor by processing an output signal obtained from the output winding (12); a measuring unit (130) for measuring the correspondence between the detection signal obtained by the detection winding (13) and the excitation signal; a temperature calculation unit (150) that calculates the temperature of the electromagnetic induction type angle detector (10) based on the correspondence relationship; A temperature detection method for calculating the temperature of an electromagnetic induction angle detector (10) in an electromagnetic induction angle temperature detection system (1), comprising: The measuring unit (130) measures any one of a phase difference between the excitation signal and the detection signal, a signal ratio between the excitation signal and the detection signal, and a ratio between the impedance of the excitation winding (11) and the impedance of the detection winding (13) as the correspondence relationship; The temperature calculation unit (150) calculates the temperature of the electromagnetic induction type angle detector (10) based on the correspondence relationship. Temperature detection method.

11. The electromagnetic induction type angle temperature detection system (1) further includes a storage unit (140) that stores a table having data of the temperature according to the correspondence relationship, The temperature calculation unit (150) calculates the temperature of the electromagnetic induction type angle detector (10) by referring to the table. The temperature detection method according to claim 10.

12. The measuring unit (130) measures the impedance of the excitation winding (11) and the impedance of the detection winding (13) at a timing when the excitation signal is not supplied from the excitation signal generating unit (110) to the excitation winding (11). The temperature detection method according to claim 10.

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