JPH11206180A - Pulse-signal sensor and rotor-position sensor using the same in motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise-proof pulse-signal sensor. SOLUTION: In a pulse-signal sensor, there are provided an operational amplifier 21 configuring tar comparing circuit for comparing with a predetermined level the input signal of an inductance sensing circuit which is a response pulse signal of the sensor, resistors 22, 23, 24, a flip-flop circuit 26, and an inverter 29 for shaping the waveform of the output signal of the operational amplifier 21 and for inverting the output signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulse signal detecting device and a motor rotor position detecting device using the same, and more particularly to a pulse signal detecting device based on a voltage or current variation that transiently responds by applying a pulse signal. The present invention relates to a pulse signal detection device that detects a response pulse signal while preventing a malfunction due to noise, and a motor rotor position detection device using the device.

[0002]

2. Description of the Related Art FIG. 7 is a block diagram of a driving device for a sensorless switched reluctance motor (hereinafter referred to as a sensorless SR motor) having a conventional rotor position detecting device, and FIG. 8 is a conventional general rotor. FIG. 9 is a diagram showing a conventional general inductance detection circuit, and FIG. 10 is a diagram showing input / output waveforms of a conventional general inductance detection circuit. FIG. 7 shows a one-phase stator winding and its driving circuit for simplicity. In FIG. 7, reference numeral 3 denotes an arbitrary stator winding of the SR motor, and 8a denotes one end of the stator winding 3 and a bus. The transistor 8b connected between the voltage 10 and one end of the stator winding 3 and GN
A transistor connected between D, 9a is a diode connected between one end of the stator winding 3 and GND, and 9b is a diode connected between the other end of the stator winding 3 and the bus voltage 10. Reference numeral 18 denotes a control circuit for turning on / off the transistor pairs 8a and 8b by a stator winding excitation signal.

A detection device 32 detects the position of the rotor of the SR motor. One end of the stator winding 3 is connected to the bus voltage 10.
And a resistor 1 connected in parallel with the transistor 8a.
3, a step function signal generating circuit 17 for generating a step function signal, connected to the other end of the stator winding 3 in parallel with the transistor 8b, and connected in series with the resistor 13 and the stator winding 3; ON-OFF based on the step function signal output from the signal generation circuit 17,
The transistor 14, which is a switching element for applying the bus voltage 10 to the stator winding as a step function voltage, is connected from a connection point between the resistor 13 and the stator winding 3, and is connected to the inductance of the stator winding 3 by the step function voltage. An inductance detection circuit 16 for detecting as a corresponding voltage, a signal representing the position of the rotor salient pole 6 based on the voltage output from the inductance detection circuit 16 and a voltage corresponding to a preset position of the rotor salient pole 6 Is output.

Next, the operation of detecting the rotor position will be described. The current for driving the SR motor is controlled by the control circuit 1
8 by the stator winding excitation signal from the transistor pair 8
a, 8b are turned on, and current is supplied to the stator winding 3 from the bus voltage 10. In the SR motor, as shown in FIG. 8, the inductance of the stator winding 3 of the stator salient pole changes periodically depending on the rotation angle of the rotor salient pole with respect to the stator salient pole. If the inductance of the stator winding 3 is detected, the position of the rotor with respect to the stator can be estimated.

As one of the methods for detecting the inductance of the stator winding 3, there is a method for checking the magnitude of a response signal due to a step signal. Hereinafter, the detection circuit will be described as an example. The transistor 14 is turned on by a signal from the step function signal generation circuit 17, and a step function voltage using the bus voltage as a power supply is applied to the stator winding 3 of the SR motor. The response voltage based on the step function voltage is input to the inductance detection circuit 16, and the inductance of the stator winding 3 can be detected by comparison with a predetermined detection level.

FIG. 9 is a typical circuit diagram of the inductance circuit 16, and 21 is an OP amplifier. OP amplifier 2
The detection level of the inductance circuit 16 is set by the resistors 22, 23, and 24 connected to 1. The detection level is set to a value corresponding to a predetermined rotor position. When the input signal of the inductance detection circuit 16 is higher than the detection level, the output of the OP amplifier 21 is L (L
ow-volt), and H (High-
volt). This signal is subjected to waveform shaping and signal inversion by the inverter 29 and output to the rotor position detection circuit 15. If the measurement is performed at the position θ4 in FIG. 8, it can be understood that the rotor has reached the position of the rotor corresponding to the detection level because the input voltage of the inductance detection circuit 16 has fallen below the predetermined detection level.

When the output signal of the step function signal generation circuit 17 of FIG. 7 is the output signal of the step function signal generation circuit as shown in FIG. 10A, the input voltage of the inductance detection circuit 16 is Due to the inductance and the time constant of the resistor 13, the voltage of the input signal of the inductance detection circuit as shown in FIG. When this voltage is input to the inductance detection circuit 16, the output is as shown in FIG.
An output like the output signal of the inductance detection circuit of (c) is obtained. When the input voltage of the inductance detection circuit 16 is lower than the detection level, an L signal is output, and when it is higher, the signal remains at H. The rotor position detection circuit 15 detects that the output of the inductance detection circuit 16 has become L, and determines the rotational position of the SR motor as the inductance detection circuit 1.
In step 6, it is possible to detect that the vehicle has reached a position corresponding to a preset detection level.

[0008]

However, in the case of a circuit in which the magnitude of the response voltage or current of a pulse signal is compared with a detection level, as in the above-described conventional inductance detection circuit 16, noise or the like is caused. Malfunction is considered. This example will be described with reference to FIG. FIG. 11A is a waveform diagram of the output signal of the step function signal generation circuit.
11B is a waveform diagram of an inductance detection circuit input signal, FIG. 11C is a waveform diagram of an inductance detection circuit output signal of Conventional 1, and FIG. 11D is a waveform diagram of an inductance detection circuit output signal of Conventional 2. Is shown.

State 1 shown in FIG. 11C (conventional 1)
Even when there is no output from the step function signal generation circuit 17 as shown in FIG.
In some cases, a signal lower than the detection level is input. In such a case, the inductance detection circuit is L
Outputs a signal. In order to solve the above problem, if the inductance detection circuit 16 is operated only during the period when the step function signal generation circuit 17 is outputting, as shown in state 1 in FIG. Even if noise enters, the output of the inductance detection circuit 16 does not change. However, when noise enters the output of the step function signal circuit 17 as in state 2 of FIG.
There is a problem that the inductance detection circuit 16 outputs an erroneous signal.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. When detecting a response signal based on a pulse signal, the present invention comprises a simple circuit, is resistant to noise, and has high reliability. An object of the present invention is to obtain a small-sized pulse signal detecting device and a motor rotor position detecting device using the device.

[0011]

A pulse signal detecting device according to the present invention receives a response pulse signal which transiently responds according to an applied pulse signal and compares the output pulse signal with a predetermined level to output an output pulse signal. The signal is to detect the response pulse signal at the timing of the rising or falling edge of the applied pulse signal.

A comparison circuit for inputting a response pulse signal that transiently responds to the applied pulse signal and comparing the response pulse signal with a predetermined level; a rising or falling edge of the applied pulse signal; A transmission circuit for transmitting an output of the comparison circuit at an edge timing.

A response pulse signal that transiently responds according to the applied pulse signal is input, and the response pulse signal is compared with a predetermined level and the output pulse signal is output. And the response pulse signal is detected based on the timing of the falling edge.

A comparison circuit for inputting a response pulse signal transiently responding to the applied pulse signal and comparing the response pulse signal with a predetermined level; an inverter for inverting the applied pulse signal; A first transmission circuit that transmits the output of the comparison circuit at the timing of the rising edge of the applied pulse signal, a second transmission circuit that transmits the output of the comparison circuit at the timing of the falling edge of the applied pulse signal, NA that NANDs and outputs the outputs of the first and second transmission circuits
And an ND circuit.

According to the rotor position detecting device for a sensorless SR motor of the present invention, a step function signal generating circuit for generating a step function signal and a pulse signal applied based on the step function signal are generated in a stator winding. The pulse signal detection device according to any one of claims 1 to 4, which detects a response pulse signal at the time of the transient response, and a position of the rotor salient pole based on a detection signal detected by the pulse signal detection device. And a rotor position detection circuit for detecting

Further, according to the present invention, there is provided a motor rotor position detecting device, comprising: a step function signal generating circuit for generating a step function signal; and a pulse signal applied based on the step function signal. The pulse signal detection device according to any one of claims 1 to 4, which detects a response pulse signal at the time of the transient response, and a position of the rotor salient pole based on a detection signal detected by the pulse signal detection device. And a rotor position detection circuit for detecting

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows an inductance detection circuit 31, which is a pulse signal detection device according to the first embodiment, and is used for detecting a rotational position of a motor. FIG. 2 is an input / output waveform diagram of the inductance detection circuit 31. In FIG. 1, reference numeral 20 denotes another power supply for detection, reference numeral 21 denotes an OP amplifier, and reference numerals 22, 23, and 24 denote resistors which are connected to the OP amplifier 21 and set a detection level of the inductance circuit 31. The OP amplifier 21 and the resistors 22, 23, and 24 constitute a comparison circuit that compares an inductance detection circuit input signal, which is a response pulse signal, with a predetermined level. 26 is a flip-flop circuit, and 29 is an inverter that shapes the waveform of the output signal of the OP amplifier 21 and inverts the signal.

Next, an outline of the operation will be described with reference to FIG. First, the conventional step function signal generating circuit 1 shown in FIG.
7, an inductance detection circuit input signal which is a response pulse signal at the time of transient response generated in the stator winding 3 by the pulse signal applied based on the step function signal generation circuit output signal from the OP amplifier 21 and the resistor 22 , 23, 24
Is input to the comparison circuit composed of In the comparison circuit, the detection level of the inductance circuit 16 is set, but is set to a value corresponding to a predetermined rotor position by the resistors 22, 23, and 24.

If the input signal of the inductance detection circuit 31 is higher than the detection level,
Is L, and when it is small, it is H. This signal is subjected to waveform shaping and signal inversion by the inverter 29 and is input to the D terminal of the flip-flop circuit 25. The timing of transmission to the output terminal Q of the flip-flop circuit 26 is determined by setting the output of the step function signal generation circuit 17 to the rising edge of the output signal of the step function signal generation circuit 17 from the step function signal generation circuit 17. To the CK terminal.

The output of the step function signal generation circuit 17 is
In order to use the same signal as the step function voltage applied to the stator winding 3 as the output terminal transmission timing of the flip-flop circuit 26 of the inductance detection circuit 31,
The output of the inductance detection circuit 31 does not completely affect noise other than the rising edge of the step function signal generation circuit 17. Then, the rotor position detection circuit 15 detects the fall of the output signal of the inductance detection circuit 31 to detect the position of the rotor.

Next, the above operation will be described in detail with reference to FIG. 2A is a waveform diagram of an output signal of the step signal generation circuit, FIG. 2B is a waveform diagram of an input signal of the inductance detection circuit, and FIG. 2C is a waveform of an output signal of the inductance detection circuit of the first embodiment. FIG. 2D is a waveform diagram of an output signal of a conventional inductance detection circuit.

In state 1 of FIG. 2, when the output of the step function signal generating circuit output signal from the step function signal generating circuit 17 is turned off (rising edge) as shown in FIG. When the input signal of the inductance detection circuit from the inductance detection circuit 31 is lower than the detection level as shown in FIG. 2B, the signal level is low during the period lower than the detection level as shown in FIG. In the embodiment, as shown in FIG. 2 (c), since the input signal of the inductance detection circuit 31 at the rising edge of the output signal of the step function signal generation circuit is lower than the detection level, it becomes L.

In state 2 of FIG. 2, when the input signal of the inductance detection circuit is higher than the detection level as shown in FIG. 2C, the detection signal of the inductance detection circuit does not change as in the related art.

In state 3 of FIG. 2, when there is no step function signal generation circuit output signal as shown in FIG. 2 (a), the inductance detection circuit input signal is lower than the detection level as shown in FIG. 2 (b). Conventionally, when a signal due to noise enters, the period becomes lower than the detection level L as shown in FIG. 2D and an erroneous signal is generated. In the present embodiment, however, the step function signal generation circuit 17 Since there is no change in the output signal of the step function signal generation circuit, that is, there is no change in the CK input of the flip-flop circuit 26, no erroneous signal is generated even if the output of the inverter 29 changes as shown in FIG. .

In state 4 of FIG. 2, if noise is input to the input signal of the inductance detection circuit during the output period of the step function signal generation circuit 17, the conventional method is as shown in FIG.
As shown in FIG. 2, the period becomes lower than the detection level signal and an erroneous signal is generated.
Since the input signal of the inductance detection circuit 31 at the time when the output of the step function signal generation circuit 17 rises is higher than the detection level as shown in FIG. 2B, the output does not change as shown in FIG.

The rotor position detection circuit 15 detects the fall (L) of the output signal of the inductance detection circuit 31, as shown in FIG. 2C, to detect the position of the rotor.

As described above, the detection circuit can be simplified by performing the detection timing for detecting the pulse signal output to the stator winding 3 and the response signal of the first pulse signal with the first pulse signal, thereby improving reliability. Can be improved.

In this embodiment, an example is shown in which the timing of the rising edge of the output signal of the step function signal generating circuit is used, but the timing of the falling edge of the output signal of the step function signal generating circuit may be used.

Embodiment 2 FIG. 3 shows an inductance detection circuit 3 which is a pulse signal detection device according to the second embodiment.
1, which indicates a case where it is used for detecting the rotational position of the motor. FIG. 4 is an input / output waveform diagram of the inductance detection circuit 31. In FIG. 3, reference numeral 20 denotes another power supply for detection, reference numeral 21 denotes an OP amplifier, and reference numerals 22, 23, and 24 denote resistors which are connected to the OP amplifier 21 and set a detection level of the inductance circuit 31. These OP amplifier 21, resistors 22, 2
Reference numerals 3 and 24 constitute a comparison circuit that compares the input signal of the inductance detection circuit, which is a response pulse signal, with a predetermined level. 25 is a flip-flop circuit as a first transmission circuit, 26 is a flip-flop circuit as a second transmission circuit, and 29 is an inverter for shaping the waveform of the output signal of the OP amplifier 21 and inverting the signal. Reference numeral 28 denotes a NAND which NANDs the outputs of the flip-flop circuits 25 and 26 and outputs the result to the rotor position detection circuit 15
This is a D circuit.

Next, an outline of the operation will be described with reference to FIG. First, the pulse signal applied based on the step function signal generation circuit output signal from the step function signal generation circuit 17 causes the inductance detection circuit input signal which is a response pulse signal at the time of a transient response generated in the stator winding 3 to be generated. , An OP amplifier 21, and resistors 22, 23, and 24.

If the input signal of the inductance detection circuit 31 is higher than the detection level,
Is L, and when it is small, it is H. This signal is subjected to waveform shaping and signal inversion by the inverter 29, and is input to the D terminals of the flip-flop circuits 25 and 26.

The output of the step function signal generation circuit 17 is input to the CK input of the flip-flop circuit 25.
The output of the step function signal generation circuit 17 is inverted by an inverter 27 before being input to the CK input of the flip-flop circuit 26. That is, the data at the time of falling of the output of the step function signal generating circuit 17 is output to the flip-flop circuit 26, and the data at the time of rising is output to the flip-flop circuit 25. The result of NANDing the outputs of the flip-flop circuits 25 and 26 with the NAND circuit 28 is output to the rotor position detection circuit 15.

In the case of this embodiment, the input voltage of the inductance detection circuit 31 is
When the output of the step function signal generation circuit 17 rises below the detection level when the output falls, and when the output of the step function signal generation circuit 17 rises below the detection level, an L signal is output to the rotational position detection circuit 15. Then, the rotor position detection circuit 15 detects the fall (L) of the output signal of the inductance detection circuit 31 to detect the position of the rotor.

The above operation will be described in detail with reference to FIG.
FIG. 4A is a waveform diagram of an output signal of a step signal generation circuit,
FIG. 4B is a waveform diagram of the inductance detection circuit input signal, FIG. 4C is a waveform diagram of the inductance detection circuit output signal of the first embodiment, and FIG. 4D is a conventional inductance detection circuit output signal. It is a waveform diagram.

State 1 to state 3 shown in FIG. 4 are the same as those described in the first embodiment, and a description thereof will be omitted.
Will be described. When the input signal of the inductance detection circuit 31 is as shown in FIG. 4B when the output signal of the step function signal generation circuit 17 is output as shown in FIG. The H signal is output during the period when the detection level is high due to noise as shown in FIG. For this reason, the rotation position detection circuit 15 detects a signal that has changed from H to L, and causes a malfunction. However, in the case of the present embodiment, even if the input of the inductance detection circuit is lower than the detection level when the step function signal generation circuit 17 rises, the input of the inductance detection circuit does not rise when the step function signal generation circuit falls. Since the state is not higher than the detection level, no signal is output to the rotation detection circuit 15 as shown in FIG.

As described above, the detection circuit for the pulse signal output to the stator winding 3 and the detection timing for detecting the response signal of the first pulse signal are performed by the first pulse signal, thereby simplifying the detection circuit and improving reliability. Can be improved.

Embodiment 3 FIG. 5 shows a pulse signal detection device according to the third embodiment, which is used for detecting the rotational position of a motor. In the figure, reference numeral 20 denotes another power supply for detection, 31 denotes an inductance circuit, and an OP amplifier 2
1, connected to an OP amplifier 21 and an inductance circuit 1
6, resistors 22, 23, 24, OP for setting the detection level of 6
It comprises an inverter 29 for shaping the waveform of the output signal of the amplifier 21 and inverting the signal. The OP amplifier 21 and the resistors 22, 23, and 24 constitute a comparison circuit that compares an input signal of the inductance detection circuit, which is a response pulse signal, with a predetermined level. Reference numeral 30 denotes a control circuit including a microprocessor that outputs a detection signal based on the output signal of the inductance circuit 16 and the output signal of the step function signal generation circuit.

Next, the operation will be described. The pulse signal applied based on the step function signal generation circuit output signal from the step function signal generation circuit 17 causes the stator winding 3
The input signal of the inductance detection circuit, which is the response pulse signal at the time of the transient response generated in
It is input to a comparison circuit composed of 23 and 24.

If the input signal of the inductance detection circuit 16 is higher than the detection level,
Is L, and when it is small, it is H. This signal is subjected to waveform shaping and signal inversion by the inverter 29 and is input to the control circuit 30.

The output of the step function signal generating circuit used to apply the step function voltage to the stator winding 3 is input to the interrupt input terminal of the control circuit 30. The pulse of the step function signal generating circuit 17 is processed as an interrupt signal of the control circuit 30, and the signal of the inverter 29 when the interrupt is generated is processed. The control circuit 30 can easily realize the same operation as the flip-flop circuits 25 and 26 described in the first and second embodiments by changing the software.
The output of the step function signal generation circuit 17 is
In order to process the interrupt of the control circuit using the same signal as the step function voltage applied to the
The output of No. 6 does not completely affect the noise other than the rising edge or the falling edge of the step function signal generation circuit 17.

As described above, by using the output of the step function signal generating circuit 17 as an interrupt of the control circuit 30, the software of the control circuit 30 can be changed without changing the circuit of the conventional pulse detector. For,
The pulse detection device can be provided with the same inexpensive circuit as before.

As shown in FIG. 6, in order to interrupt the rising and falling edges of the step function signal generating circuit 17, the signal passed through the inverter 27 is input to another interrupt terminal and processed. Can also.

[0043]

Since the present invention is configured as described above, it has the following effects.

The pulse signal detecting device according to the present invention comprises:
A response pulse signal that transiently responds according to the applied pulse signal is input, and an output pulse signal that is output in comparison with a predetermined level is output at the rising or falling edge of the applied pulse signal. Since the response pulse signal is detected, the structure is simple, strong against noise, high in reliability and small in size.

A comparison circuit for inputting a response pulse signal that makes a transient response by the applied pulse signal and comparing the response pulse signal with a predetermined level; a rising or falling edge of the applied pulse signal; And a transmission circuit for transmitting the output of the comparison circuit at the timing of the edge, so that it is resistant to noise, has a simple structure, has high reliability, and can be downsized.

Also, a response pulse signal that transiently responds according to the applied pulse signal is input, and the response pulse signal is compared with a predetermined level, and the output pulse signal is output. The response pulse signal is detected based on the timing of the falling edge and the falling edge. By comparing the respective response signals using the rising and falling timings of the pulse signal of the pulse detection circuit, it is strong against noise, the structure is simple and reliable. It is highly efficient and can be miniaturized.

Further, a comparison circuit for inputting a response pulse signal that makes a transient response by the applied pulse signal and comparing the response pulse signal with a predetermined level, an inverter for inverting the applied pulse signal, A first transmission circuit that transmits the output of the comparison circuit at the timing of the rising edge of the applied pulse signal, a second transmission circuit that transmits the output of the comparison circuit at the timing of the falling edge of the applied pulse signal, NA that NANDs and outputs the outputs of the first and second transmission circuits
The ND circuit is used, so that each response signal is compared by using the rising and falling timings of the pulse signal of the pulse detection circuit. Can be.

According to the rotor position detecting device for a sensorless SR motor of the present invention, a step function signal generating circuit for generating a step function signal and a pulse signal applied based on the step function signal are generated in a stator winding. The pulse signal detection device according to any one of claims 1 to 4, which detects a response pulse signal at the time of the transient response, and a position of the rotor salient pole based on a detection signal detected by the pulse signal detection device. And a rotor position detection circuit that detects noise, is resistant to noise, has a simple structure and high reliability,
It can be small.

Further, according to the motor rotor position detecting device of the present invention, a step function signal generating circuit for generating a step function signal and a pulse signal applied based on the step function signal are generated in the stator winding. The pulse signal detection device according to any one of claims 1 to 4, which detects a response pulse signal at the time of the transient response, and a position of the rotor salient pole based on a detection signal detected by the pulse signal detection device. And a rotor position detection circuit for detecting the noise, the structure is strong against noise, the structure is simple, the reliability is high, and the size can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an inductance detection circuit according to a first embodiment of the present invention.

FIG. 2 is a diagram showing input / output waveforms of the inductance detection circuit according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of an inductance detection circuit according to a second embodiment of the present invention.

FIG. 4 is a diagram showing input / output waveforms of the inductance detection circuit according to the first embodiment of the present invention.

FIG. 5 is a configuration diagram of an inductance detection circuit according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of an inductance detection circuit according to a third embodiment of the present invention.

FIG. 7 is a configuration diagram of a conventional general SR motor and its driving circuit.

FIG. 8 is a diagram showing the relationship between the inductance of a conventional general rotor and stator windings.

FIG. 9 is a diagram of a conventional general inductance detection circuit.

FIG. 10 is a diagram showing input / output waveforms of a conventional general inductance detection circuit.

FIG. 11 is a diagram showing input / output waveforms that cause a malfunction of a conventional general inductance detection circuit.

[Explanation of symbols]

3 Stator winding, 8a, 8b, 14 transistor, 9
a, 9b diode, 10 bus voltage, 13, 22,
23, 24 resistance, 15 rotor position detection circuit, 16
Inductance detection circuit, 17 step function signal generation circuit, 18, 30 control circuit, 20 separate power supply, 21 O
P amplifier, 25, 26 flip-flop circuit, 27,
29 inverter circuits, 28 NAND circuits.

Claims (6)

[Claims] 1. A response pulse signal that transiently responds according to an applied pulse signal is input, and an output pulse signal output after being compared with a predetermined level is converted into a rising or falling edge of the applied pulse signal. A pulse signal detection device for detecting the response pulse signal at an edge timing. 2. A comparison circuit for inputting a response pulse signal that makes a transient response according to the applied pulse signal, and comparing the response pulse signal with a predetermined level; a rising or falling edge of the applied pulse signal. A transmission circuit for transmitting an output of the comparison circuit at an edge timing. 3. A response pulse signal that transiently responds according to the applied pulse signal is input, and the response pulse signal is compared with a predetermined level, and the output pulse signal is output. A pulse signal detecting apparatus for detecting the response pulse signal based on the timing of a falling edge and a falling edge. 4. A comparison circuit that receives a response pulse signal that makes a transient response by an applied pulse signal and compares the response pulse signal with a predetermined level; an inverter that inverts the applied pulse signal; A first transmission circuit that transmits the output of the comparison circuit at the timing of the rising edge of the applied pulse signal; a second transmission circuit that transmits the output of the comparison circuit at the timing of the falling edge of the applied pulse signal; N that outputs the outputs of the first and second transmission circuits by NAND
A pulse signal detection device comprising: an AND circuit. 5. A step function signal generating circuit for generating a step function signal, and detecting a response pulse signal at the time of a transient response generated in the stator winding by a pulse signal applied based on the step function signal. A pulse signal detection device according to any one of claims 1 to 4, and a rotor position detection circuit that detects a position of a rotor salient pole based on a detection signal detected by the pulse signal detection device. A rotor position detecting device for a sensorless switched reluctance motor. 6. A step function signal generating circuit for generating a step function signal, and detecting a response pulse signal at the time of a transient response generated in the stator winding by a pulse signal applied based on the step function signal. A pulse signal detection device according to any one of claims 1 to 4, and a rotor position detection circuit that detects a position of a rotor salient pole based on a detection signal detected by the pulse signal detection device. A rotor position detecting device for a motor.