JP2008304326A - Excitation signal output device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excitation signal output device for suppressing characteristic deterioration of a rotation angle detection device by continuously varying the amplitude of a sine wave-like output signal in a simple composition. <P>SOLUTION: A control device 1 is composed of a resolver 2, an excitation signal output part 3, and an output signal processing part 4. The excitation signal output part 3 is composed of first and second sine wave signal output parts 30, 31, an excitation signal output part 32, and a phase regulation part 33. The first sine wave signal output part 30 outputs a first sine wave signal. The second sine wave signal output part 31 outputs a second sine wave signal having the same amplitude as the first sine wave signal and a phase different from that of it. The excitation signal output part 32 adds the first sine wave signal and the second sine wave signal to output a sine wave-like excitation signal. The amplitude of the excitation signal depends on the phase of the second sine wave signal. The phase regulation part 33 regulates the phase of the second sine wave signal based on the output signal of the resolver 2. Thereby the amplitude of the excitation signal can be continuously varied in a simple composition to suppress the characteristic deterioration of the rotation angle detection device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an excitation signal output device that outputs an excitation signal to a rotation angle detection device that outputs a sinusoidal signal corresponding to a rotation angle when a sinusoidal excitation signal is input.

  Conventionally, as a rotation angle detection device, for example, there is a resolver disclosed in JP-A-2006-349561. The resolver outputs a sinusoidal signal corresponding to the rotation angle when a sinusoidal excitation signal is input.

  By the way, the resolver has a characteristic in which the amplitude of the output signal changes as the temperature changes. When the amplitude of the output signal decreases, the resolution of the rotation angle decreases. Therefore, the amplitude of the excitation signal is changed in accordance with the temperature change, and the amplitude of the output signal is kept constant. Specifically, the output gain of the excitation signal output circuit is switched by a switch.

JP 2006-349561 A

  However, in this case, the output gain can be switched only discretely. For this reason, it is difficult to keep the amplitude of the output signal of the resolver constant. When four types of output gains are set, at least two signal lines are required to switch the switches. On the other hand, when eight types are set, at least three signal lines are required. For this reason, there is a problem that the number of signal lines increases and the circuit configuration becomes complicated.

  The present invention has been made in view of such circumstances, and an excitation signal output device that can continuously vary the amplitude of a sine wave-like output signal with a simple configuration and can suppress deterioration in characteristics of the rotation angle detection device. The purpose is to provide.

Means for Solving the Problems and Effects of the Invention

  Therefore, as a result of extensive research and trial and error, the present inventor adds or subtracts the first sine wave signal and the second sine wave signal, and outputs the output signal of the rotation angle detection device. By adjusting the phase of the second sine wave signal with respect to the first sine wave signal based on the amplitude, the amplitude of the sinusoidal output signal can be continuously varied with a simple configuration, and the characteristics of the rotation angle detector are degraded. As a result, the present invention has been completed.

  That is, when the sine wave excitation signal is input, the excitation signal output device according to claim 1 outputs the excitation signal to the rotation angle detection device that outputs a sine wave signal corresponding to the rotation angle. In the excitation signal output device, a first sine wave signal output means for outputting a first sine wave signal, and a second sine wave signal output for outputting a second sine wave signal having the same amplitude and different phase from the first sine wave signal. A first sine wave signal based on the amplitude of the output signal of the rotation angle detector and the excitation signal output means for adding or subtracting the first sine wave signal and the second sine wave signal to output as an excitation signal; And a phase adjusting means for adjusting the phase of the second sine wave signal with respect to.

  According to this configuration, the amplitude of the sinusoidal excitation signal can be continuously varied with a simple configuration, and deterioration in characteristics of the rotation angle detection device can be suppressed. When the first sine wave signal and the second sine wave signal having the same amplitude and different phase from the first sine wave signal are added or subtracted, a sine wave signal whose amplitude depends on the phase of the second sine wave signal is obtained. Therefore, the amplitude of the excitation signal can be continuously varied by adjusting the phase of the second sine wave signal by the phase adjusting means. In addition, unlike the prior art, there is no need for a switch for switching the gain and many signal lines for switching, so that the configuration can be simplified. By the way, in the rotation angle detection device, the amplitude of the output signal may change due to a temperature change. In this case, the characteristic of the rotation angle detection device is deteriorated. However, the phase adjusting means adjusts the phase of the second sine wave signal based on the amplitude of the output signal of the rotation angle detection device, and varies the amplitude of the excitation signal. Therefore, the change in the amplitude of the output signal can be suppressed. Accordingly, it is possible to suppress a deterioration in characteristics of the rotation angle detection device.

  The excitation signal output device according to claim 2 is the excitation signal output device according to claim 1, wherein the phase adjustment means is configured so that the maximum amplitude value of the output signal of the rotation angle detection device is within a predetermined range. The phase of the second sine wave signal with respect to the first sine wave signal is adjusted. According to this structure, the characteristic fall of a rotation angle detection apparatus can be suppressed reliably. In the rotation angle detection device, the maximum amplitude value of the output signal may change due to a temperature change. In this case, the characteristic of the rotation angle detection device is deteriorated. However, the phase adjusting means adjusts the phase of the second sine wave signal so that the maximum amplitude value of the output signal of the rotation angle detection device is within a predetermined range, and varies the amplitude of the excitation signal. Therefore, a change in the maximum amplitude value of the output signal can be suppressed. Accordingly, it is possible to reliably suppress the deterioration of the characteristics of the rotation angle detection device. It is more preferable to adjust the phase of the second sine wave signal so that the maximum amplitude value is constant.

  An excitation signal output device according to a third aspect is the excitation signal output device according to the first or second aspect, wherein the rotation angle detection device is a resolver. According to this configuration, by inputting a sinusoidal excitation signal, it is possible to reliably output a sinusoidal signal corresponding to the rotation angle.

  The excitation signal output device according to claim 4 is the excitation signal output device according to any one of claims 1 to 3, wherein the first sine wave signal output means and the second sine wave signal output means are sinusoidal PWM. It has a PWM signal output means for outputting a (Pulse Width Modulation) signal and an integration means for integrating the PWM signal. According to this configuration, the first sine wave signal and the second sine wave signal can be reliably output with a simple configuration.

  The excitation signal output device according to claim 5 is the excitation signal output device according to any one of claims 1 to 3, wherein the first sine wave signal output means outputs the first PWM signal corresponding to the first sine wave signal. The first PWM signal output means for outputting and the first integration means for integrating the first PWM signal, and the second sine wave signal output means outputs the second PWM signal corresponding to the second sine wave signal. An output means and a second integration means for integrating the second PWM signal, wherein the phase adjustment means adjusts the phase of the second PWM signal with respect to the first PWM signal based on the output signal of the rotation angle detector; And According to this configuration, the first sine wave signal and the second sine wave signal can be reliably output with a simple configuration. In addition, the phase of the second sine wave signal with respect to the first sine wave signal can be reliably adjusted.

  The excitation signal output device according to claim 6 is the excitation signal output device according to claim 5, wherein the first PWM signal output means, the second PWM signal output means and the phase adjustment means are constituted by a microcomputer. Features. According to this configuration, the number of parts can be reduced.

The excitation signal output device according to claim 7 is the excitation signal output device according to any one of claims 1 to 3, wherein the first sine wave signal output means and the second sine wave signal output means output a pulse signal. And a pulse signal output means for filtering and a filter means for passing a predetermined frequency component of the pulse signal. According to this configuration, the first sine wave signal and the second sine wave signal can be reliably output with a simple configuration.

  The excitation signal output device according to claim 8 is the excitation signal output device according to claim 7, wherein the filter means is a low-pass filter or a band-pass filter. According to this configuration, it is possible to reliably pass a predetermined frequency of the pulse signal.

  The excitation signal output device according to claim 9 is the excitation signal output device according to any one of claims 1 to 3, wherein the first sine wave signal output means includes a frequency component corresponding to the first sine wave signal. The first pulse signal output means for outputting the first pulse signal and the first filter means for passing the frequency component corresponding to the first sine wave signal of the first pulse signal, the second sine wave signal output means , Second pulse signal output means for outputting a second pulse signal including a frequency component corresponding to the second sine wave signal, and second filter means for passing the frequency component corresponding to the second sine wave signal of the second pulse signal The phase adjustment means adjusts the phase of the second pulse signal with respect to the first pulse signal based on the output signal of the rotation angle detection device. According to this configuration, the first sine wave signal and the second sine wave signal can be reliably output with a simple configuration. In addition, the phase of the second sine wave signal with respect to the first sine wave signal can be reliably adjusted.

  The excitation signal output device according to claim 10 is the excitation signal output device according to claim 9, wherein the first filter means and the second filter means are low-pass filters or band-pass filters. According to this configuration, it is possible to reliably pass the frequency component corresponding to the first sine wave signal of the first pulse signal. In addition, it is possible to reliably pass the frequency component corresponding to the second sine wave signal of the second pulse signal.

  The excitation signal output device according to claim 11 is the excitation signal output device according to claim 9 or 10, wherein the first pulse signal output means, the second pulse signal output means, and the phase adjustment means are constituted by a microcomputer. It is characterized by. According to this configuration, the number of parts can be reduced.

  The excitation signal output device according to claim 12 is the excitation signal output device according to any one of claims 1 to 11, wherein the excitation signal output means is constituted by an addition circuit or a subtraction circuit using an operational amplifier. It is characterized by. According to this configuration, the first sine wave signal and the second sine wave signal can be reliably added or subtracted.

  Next, an embodiment is given and this invention is demonstrated in detail. In the present embodiment, an example in which the excitation signal output device according to the present invention is applied to a control device that controls a motor based on an output signal of a resolver will be described.

  First, the configuration of the control device will be described with reference to FIG. Here, FIG. 1 is a block diagram of the control device in the present embodiment.

  As shown in FIG. 1, the control device 1 includes a resolver 2 (rotation angle detection device), an excitation signal output unit 3 (excitation signal output device), and an output signal processing unit 4.

  The resolver 2 is a device that outputs two sinusoidal signals corresponding to the rotation angle θ when a sinusoidal signal is input. The resolver 2 has an input terminal connected to the excitation signal output unit 3 and two output terminals connected to the output signal processing unit 4.

  The excitation signal output unit 3 is a block that outputs a sinusoidal signal to the resolver 2. Specifically, it is a block that outputs a signal that changes sinusoidally with respect to time. Further, it is also a block that adjusts the amplitude of the output signal based on the amplitude of the output signal of the resolver 2. The excitation signal output unit 3 includes a first sine wave signal output unit 30 (first sine wave signal output unit), a second sine wave signal output unit 31 (second sine wave signal output unit), and an excitation signal output unit 32. (Excitation signal output means) and a phase adjustment unit 33 (phase adjustment means).

  The first sine wave signal output unit 30 is a block that outputs the first sine wave signal sin (ωt). The first sine wave signal output unit 30 includes a first PWM signal output unit 300 (PWM signal output means, first PWM signal output means) and an integration circuit 301 (integration means).

  The first PWM signal output unit 300 is a block that outputs a PWM signal corresponding to sin (ωt), specifically, a first PWM signal. The integration circuit 301 is a circuit that integrates the first PWM signal. The integrating circuit 301 includes a resistor 301a and a capacitor 301b. One end of the resistor 301 a is connected to the output terminal of the first PWM signal output unit 300. The other end is grounded via a capacitor 301b.

  The second sine wave signal output unit 31 is a block that outputs a second sine wave signal sin (ωt + α) having the same amplitude and a different phase from the first sine wave signal. Here, the phase α is adjusted by the phase adjustment unit 33. The second sine wave signal output unit 31 includes a second PWM signal output unit 310 (PWM signal output means, second PWM signal output means) and an integration circuit 311 (integration means).

  The second PWM signal output unit 310 is a block that outputs a PWM signal corresponding to sin (ωt + α), specifically, a second PWM signal. The integration circuit 311 is a circuit that integrates the second PWM signal. The integrating circuit 311 includes a resistor 311a and a capacitor 311b. One end of the resistor 311 a is connected to the output terminal of the second PWM signal output unit 310. The other end is grounded via a capacitor 311b.

  The excitation signal output unit 32 is a block that adds the first sine wave signal sin (ωt) and the second sine wave signal sin (ωt + α) and outputs the result as an excitation signal. As shown in Equation 1, the excitation signal becomes a sine wave whose amplitude can be continuously varied by the phase α of the second sine wave signal sin (ωt + α) with respect to the first sine wave signal sin (ωt).

  The excitation signal output unit 32 includes an operational amplifier 320a and resistors 320b to 320d. The non-inverting input terminal of the operational amplifier 320a is connected to a reference power source. The voltage of the reference power supply is set to 1/2 and 2.5V of the voltage 5V of the circuit power supply. The inverting input terminal is connected to the output terminals of the integrating circuits 301 and 311 through the resistors 320b and 320c, specifically to the other ends of the resistors 301a and 311a. Further, the output terminal is connected to the inverting input terminal via the resistor 320d. Further, it is connected to the input terminal of the resolver 2 via the capacitor 34. As a result, an excitation signal that changes around 0 V is input to the resolver 2.

  The phase adjustment unit 33 is a block that adjusts the phase α of the second sine wave signal sin (ωt + α) with respect to the first sine wave signal sin (ωt) based on the output of the output signal processing unit 4. Specifically, the phase α is adjusted so that the maximum amplitude value of the output signal of the resolver 2 output from the output signal processing unit 4 is substantially constant. More specifically, the phase of the second PWM signal with respect to the first PWM signal is adjusted. The input terminal of the phase adjustment unit 33 is connected to the output signal processing unit 4, and the output terminal is connected to the second PWM signal output unit 310.

The output signal processing unit 4 is a block that calculates the rotation angle θ based on the two output signals of the resolver 2. Further, it is also a block that outputs the maximum amplitude value of the output signal to the phase adjustment unit 33. The output signal processing unit 4 includes an output signal conversion unit 40 and a calculation unit 41.

  The output signal converter 40 is a block that converts two output signals of the resolver 2 into a voltage. Specifically, the sine wave output signal of the resolver 2 that changes around 0V is converted to change around 2.5V. The input terminal of the output signal conversion unit 40 is connected to the output terminal of the resolver 2.

  The calculation unit 41 is a block that calculates the rotation angle θ based on the output signal of the output signal conversion unit 40. Further, it is also a block that outputs the maximum amplitude value of the output signal of the resolver 2 to the phase adjustment unit 33. The input terminal of the calculation unit 41 is connected to the output terminal of the output signal conversion unit 40. The output terminal that outputs the maximum value of the output signal of the resolver 2 is connected to the input terminal of the phase adjustment unit 33. Furthermore, the output terminal that outputs the rotation angle θ is connected to a motor drive circuit (not shown).

  The first PWM signal output unit 300, the second PWM signal output unit 310, the phase adjustment unit 33, and the calculation unit 41 are integrally configured by a microcomputer.

  Next, the operation of the control device 1 will be described with reference to FIG. When a voltage is supplied, each unit starts operating. The first PWM signal output unit 300 outputs a first PWM signal corresponding to sin (ωt). When the first PWM signal is output, the integration circuit 301 integrates the first PWM signal and outputs the first sine wave signal sin (ωt). On the other hand, the second PWM signal output unit 310 outputs a second PWM signal corresponding to sin (ωt + α). When the second PWM signal is output, the integration circuit 311 integrates the second PWM signal and outputs a second sine wave signal sin (ωt + α). The excitation signal output unit 32 adds the first sine wave signal sin (ωt) and the second sine wave signal sin (ωt + α), and outputs an excitation signal 2cos (α / 2) · sin (ωt + α / 2). . When the excitation signal 2cos (α / 2) · sin (ωt + α / 2) is output, the resolver 2 outputs two sinusoidal signals corresponding to the rotation angle θ as shown in Equation 2.

  The output signal converter 40 converts the output signal of the resolver 2 into a voltage and outputs it. When the output signal of the resolver 2 is converted, the calculation unit 41 calculates the rotation angle θ based on the output signal and outputs it to the motor drive circuit. Specifically, tan θ is calculated from the output signal of the resolver 2, and the rotation angle θ is obtained with reference to a table showing the relationship between the preset rotation angle θ and tan θ. Further, the calculation unit 41 obtains the maximum amplitude value A ′ from the output signal of the resolver 2 and outputs it to the phase adjustment unit 33.

  By the way, when the temperature changes, the input / output conversion coefficient A determined by the structure of the resolver 2 changes. Along with this, the amplitude maximum value A ′ of the output signal of the resolver 2 also changes. When the maximum amplitude value A ′ decreases, the resolution of the rotation angle θ decreases. However, the phase adjustment unit 33 adjusts the phase α of the second sine wave signal sin (ωt + α) with respect to the first sine wave signal sin (ωt), so that the excitation signal 2cos (α / 2) · sin (ωt + α / 2). ) Can be continuously varied. As a result, the maximum amplitude value A ′ of the output signal of the resolver 2 can be varied. The phase adjustment unit 33 adjusts the phase α so that the maximum amplitude value A ′ is substantially constant regardless of the temperature change. As a result, a decrease in resolution of the rotation angle θ can be suppressed, and a substantially constant resolution can always be secured stably.

  Finally, the effect will be described. According to the present embodiment, the amplitude of the sinusoidal excitation signal can be continuously varied with a simple configuration, and the degradation of the characteristics of the resolver 2 can be suppressed. When the first sine wave signal sin (ωt) and the second sine wave signal sin (ωt + α) are added, the excitation signal 2 cos (α / 2) · sin (ωt + α) whose amplitude depends on the phase α of the second sine wave signal. / 2). Therefore, the amplitude of the excitation signal 2 cos (α / 2) · sin (ωt + α / 2) can be continuously varied by adjusting the phase α of the second sine wave signal sin (ωt + α) by the phase adjustment unit 33. Can do. In addition, unlike the prior art, there is no need for a switch for switching the gain and many signal lines for switching, so that the configuration can be simplified. By the way, the resolver 2 changes the maximum amplitude A ′ of the output signal due to the temperature change. When the maximum amplitude value A ′ decreases, the resolution of the rotation angle θ decreases. However, the phase adjustment unit 33 adjusts the phase α of the second sine wave signal so that the amplitude maximum value A ′ of the output signal of the resolver 2 is substantially constant, and varies the amplitude of the excitation signal. Therefore, a change in the maximum amplitude value A ′ of the output signal can be suppressed. Therefore, a decrease in resolution of the rotation angle θ can be suppressed.

  In addition, according to the present embodiment, the first sine wave signal output unit 30 and the second sine wave signal output unit 31 are respectively a first PWM signal output unit 300 and a second PWM signal output unit 310 that output a PWM signal. The integration circuits 301 and 311 are included. Therefore, it is possible to reliably output the first sine wave signal and the second sine wave signal with a simple configuration.

  Furthermore, according to the present embodiment, the phase adjustment unit 33 adjusts the phase of the second PWM signal with respect to the first PWM signal based on the output signal of the resolver 2. Therefore, the phase α of the second sine wave signal with respect to the first sine wave signal can be adjusted based on the output signal of the resolver 2 with a simple configuration.

  In addition, according to the present embodiment, the first PWM signal output unit 300, the second PWM signal output unit 310, the phase adjustment unit 33, and the calculation unit 41 are integrally configured by a microcomputer. Therefore, the number of parts can be reduced. The excitation signal output unit 32 is configured by an adder circuit using an operational amplifier 320a. Therefore, it is possible to reliably add the first sine wave signal and the second sine wave signal.

  In this embodiment, the first sine wave signal sin (ωt) and the second sine wave signal sin (ωt + α) are added and output as an excitation signal. However, the present invention is not limited to this. . The second sine wave signal sin (ωt + α) may be subtracted from the first sine wave signal sin (ωt) and output as an excitation signal. Also in this case, as shown in Equation 3, the amplitude of the excitation signal can be continuously varied by the phase α of the second sine wave signal sin (ωt + α) with respect to the first sine wave signal sin (ωt).

  Therefore, the same effect can be obtained.

  In the present embodiment, the first sine wave signal output unit 30 includes a first PWM signal output unit 300 and an integration circuit 301, and the second sine wave signal output unit 31 includes the second PWM signal output unit 310. In this example, the integration circuit 311 is used, but the present invention is not limited to this. The first sine wave signal output unit outputs a first pulse signal including a frequency component corresponding to the first sine wave signal sin (ωt) (pulse signal output means, first pulse signal output means). ) And a first filter section (filter means, first filter means) that allows a frequency component corresponding to the first sine wave signal sin (ωt) of the first pulse signal to pass therethrough. The second sine wave signal output unit outputs a second pulse signal including a frequency component corresponding to the second sine wave signal sin (ωt + α) (pulse signal output means, second pulse signal output means). ) And a second filter section (filter means, second filter means) that allows a frequency component corresponding to the second sine wave signal sin (ωt + α) of the second pulse signal to pass therethrough. The first filter unit and the second filter unit may be a low pass filter or a band pass filter. In this case as well, the first sine wave signal sin (ωt) and the second sine wave signal sin (ωt + α) can be output.

  Further, in the present embodiment, the phase adjustment unit 33 adjusts the phase of the second PWM signal with respect to the first PWM signal, so that the phase α of the second sine wave signal sin (ωt + α) with respect to the first sine wave signal sin (ωt). Although an example of adjusting is given, it is not limited to this. As described above, the first sine wave signal output unit includes the first pulse signal output unit and the first filter unit, and the second sine wave signal output unit includes the second pulse signal output unit and the second filter unit. The phase adjustment unit may adjust the phase of the second pulse signal with respect to the first pulse signal. In this case as well, the phase α of the second sine wave signal sin (ωt + α) with respect to the first sine wave signal sin (ωt) can be adjusted. The first pulse signal output unit, the second pulse signal output unit, and the phase adjustment unit may be configured by a microphone computer.

It is a block diagram of the control apparatus in this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Control apparatus, 2 ... Resolver (rotation angle detection apparatus), 3 ... Excitation signal output part (excitation signal output means), 30 ... 1st sine wave signal output part (1st sine wave) Signal output means), 300 ... first PWM signal output section (PWM signal output means, first PWM signal output means), 301 ... integration circuit (integration means), 301a ... resistance, 301b ... capacitor, 31... Second sine wave signal output section (second sine wave signal output means), 310... Second PWM signal output section (PWM signal output means, second PWM signal output means), 311. Integration means), 311a ... resistor, 311b ... capacitor, 32 ... excitation signal output section (excitation signal output means), 320a ... op amp, 320b-320d ... resistance, 33 ... phase Adjustment section (phase adjustment Means), 34 ... capacitors, 4 ... output signal processing unit, 40 ... output signal conversion unit, 41 ... arithmetic unit

Claims (12)

In the excitation signal output device that outputs the excitation signal to the rotation angle detection device that outputs the sinusoidal signal according to the rotation angle when the sinusoidal excitation signal is input,
A first sine wave signal output means for outputting a first sine wave signal; a second sine wave signal output means for outputting a second sine wave signal having the same amplitude and different phase as the first sine wave signal; The excitation signal output means for adding or subtracting the 1 sine wave signal and the second sine wave signal and outputting the result as an excitation signal, and the amplitude of the output signal of the rotation angle detection device, An excitation signal output device comprising phase adjusting means for adjusting the phase of the second sine wave signal.   The phase adjusting means adjusts the phase of the second sine wave signal with respect to the first sine wave signal so that the maximum amplitude value of the output signal of the rotation angle detection device is within a predetermined range. The excitation signal output device according to claim 1.   The excitation signal output device according to claim 1, wherein the rotation angle detection device is a resolver.   The first sine wave signal output means and the second sine wave signal output means include PWM signal output means for outputting a sinusoidal PWM signal and integration means for integrating the PWM signal. Item 4. The excitation signal output device according to any one of Items 1 to 3.   The first sine wave signal output means includes first PWM signal output means for outputting a first PWM signal corresponding to the first sine wave signal, and first integration means for integrating the first PWM signal. The two sine wave signal output means includes second PWM signal output means for outputting a second PWM signal corresponding to the second sine wave signal, and second integration means for integrating the second PWM signal, and the phase adjustment means. 4. The excitation signal output device according to claim 1, wherein the phase of the second PWM signal with respect to the first PWM signal is adjusted based on the output signal of the rotation angle detection device.   6. The excitation signal output device according to claim 5, wherein the first PWM signal output means, the second PWM signal output means, and the phase adjustment means are configured by a microcomputer.   The first sine wave signal output means and the second sine wave signal output means include pulse signal output means for outputting a pulse signal and filter means for passing a predetermined frequency component of the pulse signal. The excitation signal output device according to claim 1.   8. The excitation signal output device according to claim 7, wherein the filter means is a low-pass filter or a band-pass filter.   The first sine wave signal output means includes first pulse signal output means for outputting a first pulse signal including a frequency component corresponding to the first sine wave signal, and the first sine wave signal of the first pulse signal. And a second filter that outputs a second pulse signal including a frequency component corresponding to the second sine wave signal. Signal output means and second filter means for passing a frequency component corresponding to the second sine wave signal of the second pulse signal, and the phase adjustment means outputs the output signal of the rotation angle detection device to the output signal. The excitation signal output device according to claim 1, wherein the phase of the second pulse signal with respect to the first pulse signal is adjusted based on the first pulse signal.   The excitation signal output device according to claim 9, wherein the first filter means and the second filter means are low-pass filters or band-pass filters.   The excitation signal output device according to claim 9 or 10, wherein the first pulse signal output means, the second pulse signal output means, and the phase adjustment means are constituted by a microcomputer.   The excitation signal output device according to any one of claims 1 to 11, wherein the excitation signal output means includes an addition circuit or a subtraction circuit using an operational amplifier.

Images