JPH1048235A - Rotating state detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the r.p.m. and the phase angle accurately even if the r.p.m. of a rotator varies over a wide speed range. SOLUTION: When a rotary shaft 100 makes one revolution, a rotational pulse generator 110 generates sixty rotational pulses NP1 while a rotational pulse generator 120 generates one rotational pulse NP2. A time pulse oscillator 130 outputs a high frequency time pulse TP while a phase angle measurement command unit 190 outputs a phase angle measurement command Y at a predetermined timing. A low r.p.m. operating unit 140 determines an r.p.m. NL using the pulses TP, NP1 while a high r.p.m. operating unit 150 determines an r.p.m. NH using the pulses TP, NP2 and an r.p.m. selector 160 outputs the NL and NH, respectively, at the time of low speed and high speed. A phase angle operating unit 180 determines a phase angle PH using the pulses NP1, NP2 and the command Y while an inter-pulse angle operating unit 200 determines a correction phase angle ΔPH using the pulses TP, NP1 and the command Y and a phase angle operation output unit 210 adds the ΔPH to the PH to produce a phase angle PHS.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotational state detecting device, and accurately detects a rotational speed and a phase of a rotating body whose rotational speed changes in an extremely wide speed range in any speed range. It is devised so that it can be done. In particular, the present invention is suitable for use in detecting the rotation speed and phase of a rotating body having a large GD ² (flywheel effect).

[0002]

2. Description of the Related Art A power generation facility using a gas turbine generator can be easily started and stopped, can cope with a sudden change in load, is suitable for automation, and has a short construction period. Therefore, it is suitable for peak load and emergency power supply equipment. Such a gas turbine power generation facility is configured by a gas turbine generator including a gas turbine and a generator, an inverter, and various control devices, and uses a synchronous machine as a generator.

[0003] When the gas turbine generator is started, it is started in the following procedure. In other words, the gas turbine generator is started and rotated by a mechanical driving device such as a turning gear until the rotational speed is 0 to several rpm (for example, 2.5 rpm). Furthermore, in order to increase the rotation speed from several rpm to several thousand rpm (for example, 3600 rpm), which is a rated rotation speed, the synchronous machine functions as a synchronous motor, and the power supply frequency supplied from the inverter to the synchronous machine is gradually increased. Motor drive.

When the number of revolutions enters a range where the gas turbine can be ignited, the gas turbine is ignited (gas is supplied to the gas turbine) to generate a gradual increasing force of rotation in the gas turbine. After reaching a predetermined number of rotations capable of speeding up by itself, the inverter is disconnected, the gas turbine generator is rotated by the gas turbine, and the synchronous machine functions as a generator to generate power.

Here, an example of a conventional gas turbine power generation facility will be described with reference to FIG.

As shown in FIG. 1, in a gas turbine generator including a gas turbine 2 and a synchronous machine 1, a rotor of the synchronous machine 1 is directly connected to a rotor of the gas turbine 2, and the rotor and the rotor are connected to each other. GD ² (flywheel effect) is extremely large. Since the GD ² is extremely large as described above, when increasing the gas turbine generator from several rpm to several thousand rpm, which is the rated rotation speed, it is necessary to precisely control the torque to a predetermined value to increase the rotation speed. Has been requested.

When starting up the gas turbine generator, first, the circuit breakers 3 and 4 are opened, and the gas turbine generator is rotated to several rpm by a mechanical drive device (not shown) such as a turning gear. .

When the rotational speed increases to several rpm, the drive by the mechanical drive device is stopped, the breaker 4 is turned on while the open state of the breaker 3 is maintained, and the three-phase AC current is supplied from the inverter 5 to the synchronous machine 1. To make the synchronous machine 1 function as a synchronous motor.

The inverter 5 receives the power of the power system L1 via the transformer 6, is gate-controlled by a gate control signal s sent from the activation control device 7, and has a frequency corresponding to the timing of the gate control signal s. Outputs three-phase alternating current. The frequency-controlled three-phase AC current is supplied to the synchronous machine 1 via the transformer 12 and the circuit breaker 4, and the synchronous machine 1 rotates at a rotation speed according to the frequency of the supplied current.

The pulse generator 8a of the rotation state detecting device 8 is connected to the rotor of the gas turbine 2 and has a number of rotations corresponding to the number of rotations of the rotor of the gas turbine 2, that is, the number of rotations of the rotor of the synchronous machine 1. It outputs a pulse signal p.

Conventionally, the pulse generator 8a has 2
Phase pulse optical pickups and multi-pulse encoders were employed. Then, the phase angle calculator 8b of the rotation state detecting device 8 detects the rotor phase θ based on the pulse signal p,
The rotation speed calculator 8c detects the rotation speed n of the rotor based on the pulse signal p. The phase θ and the rotation speed n
Sent to

The starting control device 7 includes a constant torque controller 7
a, a constant output controller 7b, a PWM synthesizer 7c, etc., and a three-phase AC current is supplied from the inverter 5 to the synchronous machine 1 so that the rotational speed of the synchronous machine 1 gradually increases and the motor output torque becomes a predetermined value. , So that the timing of the gate control signal s is controlled and output.

The field coil of the synchronous machine 1 is supplied with a field current via a rectifier 9 composed of a thyristor. Moreover, the value of the field current is controlled by the generator control device 10.

A GTO (gate turn-off) thyristor is used as a switching element of the inverter 5 and the rectifier 9.

As described above, the synchronous machine 1 is driven by the inverter 5 by the inverter to increase the rotation speed from a few rpm, and the gas turbine 2 is ignited so that the gas turbine 2 can rotate at a predetermined rotation speed. Is increased to several thousand rpm, the circuit breaker 4 is opened. Thereafter, when the rated rotation speed is reached, the circuit breaker 3 is turned on, the gas turbine generator is rotated by the torque of the gas turbine 2, and the synchronous machine 1 functions as a generator.

The electric power generated by the synchronous machine 1 is transmitted to the transformer 1
1 to the power system L1.

[0017]

In the above-described gas turbine power generation equipment, when starting up the gas turbine generator, the synchronous machine 1 is operated while maintaining a synchronous pull-in state in an extremely wide speed range from several rpm to several thousand rpm. It is necessary to control the speed and phase so as to increase the rotation speed of the motor, and to accurately control the timing of the gate control so that the motor output torque is set to a predetermined value in all regions in a wide speed range. In order to do this, it is necessary to detect the phase θ and the rotation speed n very accurately, but there are the following problems.

Conventionally, as means for detecting the rotational speed and the phase angle,
It is conceivable to use various rotary encoders.
In this case, since the mounting position of the detector is basically limited to the shaft end of the generator or gas turbine, there are many unsuitable points in the specification of the rotary encoder which is a precision machine. That is, the rotary encoder is a precision machine with a mechanical sliding part, has a small tolerance for disturbances that are expected to occur in connection with a large machine shaft, and the generated signal is processed from the detector at a high frequency. Since it is susceptible to noise and the like in long-distance signal transmission to an arithmetic unit, it is not suitable for long-term stable and highly reliable measurement.

Further, conventionally, the phase θ and the rotation speed n are obtained simply by using the output pulse signal p as it is.
For this reason, the phase θ and the number of revolutions n cannot be detected with high accuracy in all the speed ranges in a wide speed range. Therefore, it has not been possible to control the motor output torque to a predetermined value in a wide speed range to accurately and gradually increase the rotation speed of the synchronous machine 1.

In view of the above-mentioned prior art, the present invention provides a rotating body such as a synchronous machine of a gas turbine generator, whose rotating speed changes in an extremely wide speed range in which the magnification of low speed and high speed is about 1000 times. It is an object of the present invention to provide a rotation state detection device capable of accurately detecting the number of rotations and phase in any speed region (whether in a low-speed rotation region or a high-speed rotation region). I do.

[0021]

To solve the above-mentioned problems, the configuration of the present invention comprises a time pulse oscillator (130) for outputting a high-frequency time pulse (TP) and a large number of first pulses during one rotation of the rotating body. A first rotation pulse generator (110) for outputting the rotation pulse (NP1), and a second rotation pulse generator (110) that outputs a smaller number of second rotation pulses (NP1) than the number of outputs of the first rotation pulse (NP1) during one rotation of the rotating body. A second rotation pulse generator (120) for outputting a rotation pulse (NP2), the time pulse (TP) and the first rotation pulse (NP1) being input, and
In the period between the rotation pulse (NP1) and the subsequent first rotation pulse (NP1), the time pulse (TP)
A low speed engine (140) for calculating and outputting a first engine speed (NL) indicating the engine speed of the rotating body based on the counted number;
P) and the second rotation pulse (NP2) are input, and in a period between the preceding second rotation pulse (NP2) and the subsequent second rotation pulse (NP2), a time pulse (TP) A high-speed rotation speed calculating device (150) that counts the number of inputs of the rotation speed and calculates and outputs a second rotation speed (NH) indicating the rotation speed of the rotating body based on the counted number; (NL) and the second rotation speed (NH) are input, and the determination rotation speed is set, and the rotation speed (NL),
When the value of (NH) is equal to or lower than the determination rotation speed, the first rotation speed (NL) is output. When the values of the rotation speeds (NL) and (NH) exceed the determination rotation speed, the second rotation speed (NH) is output. ) That outputs a rotation number.

Further, according to the structure of the present invention, a time pulse oscillator (130) for outputting a high-frequency time pulse (TP) and a second pulse for outputting a large number of first rotation pulses (NP1) during one rotation of the rotating body. One rotation pulse generator (110) and a second rotation pulse generator (NP2) that outputs a smaller number of second rotation pulses (NP2) than the number of output of the first rotation pulse (NP1) during one rotation of the rotating body. The time pulse (TP) and the first rotation pulse (NP1) are inputted, and the preceding first rotation pulse (NP1) and the following first rotation pulse (NP1) NP1), a pulse counter (141) that counts the number of input time pulses (TP) and outputs an integrated pulse number (P1) indicating the count number, and a phase angle measurement at a predetermined timing. Phase angle for outputting command (Y) A measurement command device (190), the first rotation pulse (NP1), the second rotation speed pulse (NP2), and the phase angle measurement command (Y) are input, and the second rotation pulse (NP2) is generated. In the period from the input time to the time when the phase angle measurement command (Y) is input,
A phase angle calculation device (180) that counts the number of inputs of the first rotation pulse (NP1), calculates and outputs a phase angle (PH) based on the counted number, the time pulse (TP) and the second 1 rotation pulse (NP1) and the number of accumulated pulses (P
1) and the phase angle measurement command (Y) are input, and a time pulse (TP) is provided in a period from the time when the first rotation pulse (NP1) is input to the time when the phase angle measurement command (Y) is input. ) Is counted, and based on the counted number and the accumulated pulse number (P1), the correction phase angle (ΔP
H) Calculates and outputs the angle between pulses (200)
And a phase angle calculation output device (210) for obtaining and outputting a phase angle (PHS) by adding the correction phase angle (ΔPH) to the phase angle (PH).

Further, the configuration of the present invention comprises a time pulse oscillator (130) for outputting a high-frequency time pulse (TP) and a second pulse for outputting a number of first rotation pulses (NP1) during one rotation of the rotating body. One rotation pulse generator (110) and a second rotation pulse generator (NP2) that outputs a smaller number of second rotation pulses (NP2) than the number of output of the first rotation pulse (NP1) during one rotation of the rotating body. The time pulse (TP) and the first rotation pulse (NP1) are inputted, and the preceding first rotation pulse (NP1) and the following first rotation pulse (NP1) NP1), the number of input time pulses (TP) is counted, and the first rotation number (NL) indicating the rotation number of the rotating body is based on the integrated pulse number (P1) indicating the counted number. ) Calculation and output of low-speed rotation calculation device (140) , The time pulse (T
P) and the second rotation pulse (NP2) are input, and in a period between the preceding second rotation pulse (NP2) and the subsequent second rotation pulse (NP2), a time pulse (TP) A high-speed rotation speed calculating device (150) that counts the number of inputs of the rotation speed and calculates and outputs a second rotation speed (NH) indicating the rotation speed of the rotating body based on the counted number; (NL) and the second rotation speed (NH) are input, and the determination rotation speed is set, and the rotation speed (NL),
When the value of (NH) is equal to or lower than the determination rotation speed, the first rotation speed (NL) is output. When the values of the rotation speeds (NL) and (NH) exceed the determination rotation speed, the second rotation speed (NH) is output. ) And a phase angle measurement commander that outputs a phase angle measurement command (Y) at a predetermined timing.
(190), the first rotation pulse (NP1) and the second rotation pulse (NP1).
Rotation speed pulse (NP2) and the phase angle measurement command (Y)
Is input, and during the period from when the second rotation pulse (NP2) is input to when the phase angle measurement command (Y) is input, the number of inputs of the first rotation pulse (NP1) is counted. A phase angle calculation device (180) that calculates and outputs a phase angle (PH) based on the count number, the time pulse (TP), the first rotation pulse (NP1), and the integrated pulse number (P1) And the phase angle measurement command (Y) are input, and during the period from the time when the first rotation pulse (NP1) is input to the time when the phase angle measurement command (Y) is input, the time pulse (TP) is An inter-pulse angle calculator (200) for counting the number of inputs, calculating and outputting a corrected phase angle (ΔPH) based on the counted number and the integrated pulse number (P1); Adding the correction phase angle (ΔPH) A phase angle calculation output device (210) for obtaining and outputting a phase angle (PHS).

Further, the configuration of the present invention comprises the first rotation pulse generator (110) and the second rotation pulse generator (120).
Comprises a gear fitted concentrically to a rotating body and a proximity sensor for detecting the teeth of the gear, and each time the proximity sensor detects the gear teeth, the rotation pulses (NP1), (NP2)
Is output.

In the configuration of the present invention, the phase angle calculation output device (210) includes a mechanical / electrical angle corrector (212) and a delay time corrector (213).

[0026]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a rotation state detection device according to an embodiment of the present invention.

This rotational state detecting device detects the rotational state of the rotor of the synchronous machine 1 of the gas turbine generator and the rotational shaft 100 connected to the gas turbine 2.
In this specification, the rotation state is used as a general term for three situations of “rotation speed”, “phase”, and “rotation speed and phase”.

As shown in FIG. 1, a rotation pulse generator 1
Reference numeral 10 includes a gear 111, a magnetic proximity sensor 112, and a pulse output circuit 113. The gear 111 is fitted concentrically on the rotating shaft 100 and has 60 teeth (the number of teeth of the gear 111: GN1 = 60).

The proximity sensor 112 includes a rotating gear 111.
Are arranged close to the teeth of each tooth, and detects the approach / separation of each tooth. The pulse output circuit 113 outputs a rotation pulse NP1 (see FIG. 2B) each time the proximity sensor 112 detects each tooth. In other words, every time the rotation shaft 100 makes one rotation, 60 rotation pulses NP1 are output.

The rotation pulse generator 120 includes a gear 121
And a magnetic proximity sensor 122 and a pulse output circuit 123. The gear 121 is fitted concentrically on the rotating shaft 100 and has one tooth (the number of teeth of the gear 121: GN).
2 = 1).

The positions of the teeth of the gear 121 are arranged in accordance with the positions of the field coils of the synchronous machine 1. Proximity sensor 12
Numeral 2 is disposed close to the teeth of the rotating gear 121, and detects the approach / separation of the teeth of the gear 121. The pulse output circuit 123 outputs a rotation pulse NP2 (see FIG. 2C) each time the proximity sensor 122 detects a tooth. That is, each time the rotation shaft 100 makes one rotation, one rotation pulse NP2 is output.

The number of teeth GN1 of the gear 111 and the number of teeth GN2 of the gear 121 are different from each other by one or two digits. The reason why the number of teeth is greatly different is that, as described later, since the range of the number of revolutions to be detected is extremely wide, the number of revolutions is detected separately in a high-speed region and a low-speed region. is there. By doing so, the rotation speed can be accurately detected in both the low-speed region and the high-speed region (details will be described later).

The time pulse oscillator 130 is an oscillator that oscillates at an oscillation frequency of several tens KHz, and has a time pulse TP (FIG. 2) having a frequency (high frequency) of several tens KHz.
(See (a)).

The low-speed rotation speed calculating device 140 includes a pulse counter 141 and a rotation speed calculator 142.
The pulse counter 141 is a general-purpose IC counter, and includes a count terminal C, a latch terminal L, and a zero clear terminal Z.
And a read terminal R.

The pulse counter 141 receives a time pulse TP at its count terminal C, and a rotation pulse NP1 at its latch terminal L and zero clear terminal Z. The pulse counter 141 counts up the count every time the time pulse TP is input, latches (temporarily stores) the count when the rotation pulse NP1 is input to the latch terminal L, and immediately counts the count. (The latch, the output of the integrated pulse number, and the timing of clearing the count number are well-known as an IC counter, but details thereof will be described later.)

As a result, the period between the preceding rotational speed pulse NP1 and the succeeding rotational speed pulse NP1 (see FIG. 2)
Is read out as the integrated pulse number P1.

The GD ^{2 of} the rotating shaft 100 (including the rotor of the turbine 2 and the synchronous machine) is extremely large,
Since the speed is gradually increased with respect to the calculation interval, there is almost no difference in the period between adjacent periods.

The rotation speed calculator 142 is provided with the pulse counter 1
Number of accumulated pulses P1 latched (temporarily stored) in 41
Is read out and applied to the following equation (1),
The rotation number NL (rpm) of the rotation shaft 100 is calculated. NL = (oscillation frequency of time pulse oscillator 130 × 60 seconds) ÷ (integrated pulse number P1 × number of teeth of gear 111 GN1) (1)

The rotation speed NL calculated by the low speed rotation speed calculation device 140 shows an accurate value especially when the rotation speed of the rotating shaft 100 is small. The reason is that even if the number of rotations is small, the number of teeth of the gear 111 is large and a large number of rotation pulses NP1 are output from the rotation pulse generator 110.

Here, in the pulse counter 141,
An example of the latch, the output of the accumulated pulse number, and the timing of clearing the count number will be described with reference to FIG. As shown in FIG. 3, when the rotation pulse NP1 is input to the latch terminal L, the pulse counter 141 latches the count number, and then reads the integrated pulse number (latch count number) P1.

Further, the count is cleared at a point in time when the rotation pulse NP1 is input to the zero clear terminal Z and delayed by a small time Δt. After clearing, the input number of the time pulse TP is counted again. In addition, the short time Δt is set shorter than the pulse interval time of the time pulse TP.

The high-speed rotation speed calculating device 150 includes a pulse counter 151 and a rotation speed calculator 152.
The pulse counter 151 is a general-purpose IC counter, and includes a count terminal C, a latch terminal L, and a zero clear terminal Z.
And a read terminal R.

The pulse counter 151 receives the time pulse TP at its count terminal C, and receives the rotation pulse NP2 at its latch terminal L and zero clear terminal Z. The pulse counter 151 counts up the count every time the time pulse TP is input, latches (temporarily stores) the count when the rotation pulse NP2 is input to the latch terminal L, and immediately counts the count. (Here, the timing of the latch, the output of the integrated pulse number, and the clearing of the count number are the same as those of the pulse counter 141).

As a result, the period between the preceding rotational speed pulse NP2 and the succeeding rotational speed pulse NP2 (see FIG. 2)
Is read out as the integrated pulse number P2.

The GD ^{2 of} the rotating shaft 100 (including the turbine 2 and the rotor of the synchronous machine) is extremely large,
Since the speed is gradually increased with respect to the calculation interval, there is almost no difference in the period between adjacent periods.

The rotation speed calculator 152 is a pulse counter 1
The accumulated pulse number P2 latched (temporarily stored) in P51
Is read out and applied to the following equation (2),
The rotation speed NH (rpm) of the rotating shaft 100 is calculated. NH = (oscillation frequency of time pulse oscillator 130 × 60 seconds) ÷ (integrated pulse number P2 × number of teeth of gear 121 GN2) (2)

The rotation speed NH calculated by the high-speed rotation calculation device 150 shows an accurate value especially when the rotation speed of the rotating shaft 100 is large. This is because the rotation pulse generator 120
Is one rotation pulse N every time the rotation shaft 100 makes one rotation.
Although only P2 is output, the number of rotation pulses NP2 per unit time increases because the rotation speed increases during high-speed rotation.
Is output.

At the time of high-speed rotation, since a very large number of rotation pulses NP1 are output from the rotation pulse generator 110, the measurement scale of the rotation speed NL becomes too fine with respect to the high-speed rotation speed. It is not appropriate to use NL to indicate the high-speed rotation speed.

The rotation number selection device 160 includes a rotation number determination unit 1
61 and select switches 162 and 163. The rotation speed determination unit 161 is set with a determination rotation speed. For example, when the rotation speed of the rotation shaft 100 is from 2.5 rpm to 2000 rpm, 30
rpm is set.

The rotational speeds NL and NH are input to the rotational speed determiner 161. If the rotation speeds NL and NH are equal to or less than 30 rpm, the rotation speed determination unit 161 turns on the selection switch 162 and opens the selection switch 163. When the rotation speeds NL and NH exceed 30 rpm, the selection switch 163 is turned on and the selection switch 162 is opened.

Therefore, when the rotation speed of the rotation shaft 100 is 30 rpm or less, the rotation speed NL is output from the rotation speed selection device 160, and the rotation speed of the rotation shaft 100 is 30 rpm.
If it exceeds m, the rotation speed NH is output.

The number of rotations NL (at low speed rotation) or the number of rotations NH (at high speed rotation) selectively output from the rotation number selection device 160 is displayed on a rotation number display 171 (rotational number).
Is displayed and sent to the activation control device (see FIG. 4) to be used for controlling the inverter.

As described above, the rotation speed NL that accurately indicates the rotation speed is output at the time of low-speed rotation, and the rotation speed NH that accurately indicates the rotation speed is output at the time of high-speed rotation. it can.

The phase angle calculation device 180 includes a pulse counter 181 and a phase angle calculator 182. The pulse counter 181 is a general-purpose IC counter, and has a count terminal C, a latch terminal L, a zero clear terminal Z, and a read terminal R.

Further, the phase angle measurement command unit 190 outputs a phase angle measurement command Y. That is, although it is not necessary to output the phase angle continuously, it generally takes some processing time from detection to output.
The phase angle is output only at a necessary time from the relationship between the processing unit capacity and the usage rate.
At 90, the timing is determined (or calculated) and the phase angle measurement command Y is output.

The pulse counter 181 receives a rotation pulse NP1 at its count terminal C, a phase angle measurement command Y at its latch terminal L, and a rotation pulse NP2 at its zero clear terminal Z.

The pulse counter 181 detects the rotation pulse NP
When the phase angle measurement command Y is input to the latch terminal L, the count number is latched (temporarily stored) and the rotation pulse NP
When 2 is input to the zero clear terminal Z, the count number is cleared.

The phase angle calculator 182 is a pulse counter 1
Number of accumulated pulses P3 latched (temporarily stored) at 81
Is read out and applied to the following equation (3),
The phase angle PH of the rotating shaft 100 is calculated. PH = 360 degrees / the number of teeth GN1 of the gear 111 × the number of accumulated pulses P3 (3)

The inter-pulse angle calculation device 200 includes a pulse counter 201 and a correction value calculator 202. The pulse counter 201 is a general-purpose IC counter, and has a count terminal C, a latch terminal L, a zero clear terminal Z, and a read terminal R.

The pulse counter 201 receives a time pulse TP at its count terminal C, a phase angle measurement command Y at its latch terminal L, and a rotation pulse NP1 at its zero clear terminal Z.

The pulse counter 201 has a time pulse TP
Is incremented every time is input, and when the phase angle measurement command Y is input to the latch terminal L, the count is latched (temporarily stored) and the rotation pulse NP
When 1 is input to the zero clear terminal Z, the count number is cleared.

The correction value calculator 202 is a pulse counter 1
The corrected phase angle ΔPH is calculated by applying the accumulated pulses P1 and P4 latched (temporarily stored) in 41 and 201 to the following equation (4). ΔPH = (integrated pulse number P4 ÷ integrated pulse number P1) × (360 degrees ÷ number of teeth GN1 of gear 111) (4)

The phase angle PH determined as described above indicates a large phase of 360 degrees / GN1 per rotation (period) of the rotating shaft 100, and the corrected phase angle ΔPH is 360 / GN of the rotating shaft 100. The detailed phase in GN1 degree (period) is shown. That is, 360 / GN1 within one rotation
The phase in units of degrees is indicated by the phase angle PH, and is 360 / G
A finer phase within N1 degrees is indicated by a correction phase angle ΔPH.

The phase angle calculation output device 210 is
11, mechanical / electrical angle corrector 212, and delay time corrector 21
3 is comprised. The mechanical / electrical angle corrector 212
A mechanical / electrical angle θf indicating a correction value of the electric angle with respect to the position of the tooth of the gear 121 (the origin of the mechanical angle) is output. This mechanical / electrical angle θf is set to zero when the teeth of the gear 121 are arranged so that the electric angle of the field coil of the synchronous machine 1 is zero. When the position of the teeth of the gear 121 deviates from the position where the electric angle of the field coil is zero, the mechanical / electrical angle θf is set according to the deviation amount.

The delay time corrector 213 has a delay time correction angle θt which is an angle which rotates during the processing time of the arithmetic / processor.
Is output. That is, in the phase angle measurement command device 190,
After transmitting the phase angle measurement command Y, the phase angle PHS is output, and after that, a predetermined delay time t is required until the control corresponding to the phase angle PHS is started.
00 rotates to some extent. Therefore, a predetermined delay time t is set in advance, the rotation speed signals NL and NH from the rotation speed selection device 160 are received, and the delay time correction angle θt (= K ·
t / NL (NH) .360 degrees). K is a conversion coefficient.

The adder 211 outputs the phase angle PHS by adding the phase angle PH, the correction phase angle ΔPH, the mechanical / electrical angle θf, and the delay time correction angle θt. The phase angle PHS accurately indicates the rotation phase of the rotation shaft 100.

The phase angle PHS is calculated by using the phase angle display 172.
The value (phase angle) is displayed at and is sent to the activation control device (see FIG. 4) to be used for controlling the inverter. As described above, since the accurate phase angle PHS is output, accurate phase control can be performed.

In the above embodiment, the gears 111,
Although the ratio of the numbers of teeth GN1 and GN2 of the 121 is 1:60, other ratios may be used as long as the ratios differ by about one to two digits. Further, the gear 121 may be provided with two or more teeth.

In the example of this embodiment, 1 rpm to 36
It is necessary to measure in the range of the number of rotations up to 00 rpm, and when performing this range with two gears, the ratio of GN1 and GN2 = (3600/1) ^1/2 = 60 is determined.

Further, only one gear is provided, this gear is provided with a large number of teeth, and only one of the teeth is raised, and all the teeth are detected by the proximity sensor 112.
The proximity sensor 122 may detect one raised tooth. By doing so, the gears can be shared and the configuration is simplified.

In the above-described embodiment, the rotation pulse generators 110 and 120 use the gears 111 and 121 and the magnetic sensors 112 and 122 as the sensor mechanism, but instead use a slit type or a tachogenerator type. A sensor mechanism may be used. However, in the current technology, a sensor mechanism using a gear and a magnetic proximity sensor is preferable because the response time is shortest.

Further, in the above embodiment, the position of the teeth of the gear 121 is adjusted to the position of the field coil of the synchronous machine 1 (exactly, not the mechanical center of the field coil but the center of the magnetic field). Although it may be arranged, if the tooth position is arranged at an arbitrary position without being related to the position of the field coil, the mechanical / electrical angle corrector 212 adjusts the mechanical / electrical angle θf. As a result, an accurate phase angle PHS can be obtained.

Of course, the present invention can be applied not only to detecting the rotational speed and rotational phase of a synchronous machine but also to detecting the rotational speed and rotational phase of another rotating body.

[0074]

As described above in detail with the embodiments, according to the present invention, a high-frequency time pulse (T
P), a large number of rotation pulses (NP1) output during one rotation of the rotating body, and a second rotation pulse (NP) output less than the number of outputs of the first rotation pulse (NP1).
2) is generated, a rotation speed (NL) indicating an accurate speed at a low speed is obtained using the time pulse (TP) and the first rotation pulse (NP1), and the time pulse (TP) and the second rotation pulse (NP1) are calculated.
By using the rotation pulse (NP2), the rotation speed (NH) indicating the correct speed at high speed is obtained, the rotation speed (NL) is output at low speed, and the rotation speed (NH) is output at high speed. Accurate rotation speed can be obtained regardless of whether the rotation speed is low or high.

In the present invention, a high-frequency time pulse (T
P), a large number of rotation pulses (NP1) output during one rotation of the rotating body, and a second rotation pulse (NP) output less than the number of outputs of the first rotation pulse (NP1).
2) generate a phase angle measurement command (Y) output at a predetermined timing, and generate a first rotation pulse (NP1) and a second rotation pulse (NP1).
Of the rotation pulse (NP2) and the phase angle (PH) calculated using the phase angle measurement command (Y), the time pulse (TP), the first rotation pulse (NP1), and the phase angle measurement command (Y). Since the phase angle (PHS) is obtained by adding the correction phase angle (ΔPH) calculated using the above,
An accurate phase angle can be obtained.

In the present invention, the rotation pulses (NP1) and (NP2) corresponding to the rotation of the rotating body are output by using a sensor mechanism using a gear and a proximity sensor. A rotation pulse with an accurate pulse interval can be obtained, and thus an accurate rotation speed and rotation phase can be detected.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a rotation state detection device according to an embodiment of the present invention.

FIG. 2 is a timing chart showing a pulse signal of the rotation state detection device.

FIG. 3 is an explanatory diagram showing a relationship between a rotation pulse and an operation timing of a counter.

FIG. 4 is a configuration diagram showing a gas turbine power generation facility.

[Description of Signs] 1 Synchronous machine 2 Gas turbine 3, 4 Circuit breaker 5 Inverter 6 Transformer 7 Start-up control device 7a Constant torque controller 7b Constant output controller 7c PWM synthesizer 8 Rotation state detector 8a Pulse generator 8b Phase angle Calculator 8c Rotation speed calculator 9 Rectifier 10 Generator control device 11, 12 Transformer 100 Rotary shaft 110, 120 Rotation pulse generator 111, 121 Gear 112, 122 Proximity sensor 113, 123 Pulse output circuit 130 Time pulse oscillator 140 Low speed rotation Number operation device 141 Pulse counter 142 Revolution speed operation device 150 High speed rotation speed operation device 151 Pulse counter 152 Revolution speed operation device 160 Revolution speed selection device 161 Revolution speed judgment device 162,163 Selection switch 171 Revolution speed display 172 Phase angle display 180 phases Computing device 181 Pulse counter 182 Phase angle computing device 190 Phase angle measurement command device 200 Inter-pulse angle computing device 201 Pulse counter 202 Correction value computing device 210 Phase angle computing output device 211 Adder 212 Mechanical / electrical angle compensator 213 Delay time correction NP1, NP2 rotation pulse TP time pulse P1, P2, P3, P4 integrated pulse number NL, NH rotation speed Y phase angle measurement command PH phase angle ΔPH correction phase angle PHS phase angle θf mechanical / electrical angle θt delay time correction angle s Gate control signal p Pulse signal θ Phase n Speed L1 Power system C Count terminal L Latch terminal Z Zero clear terminal R Read terminal

Claims (5)

[Claims] 1. A time pulse oscillator (130) for outputting a high-frequency time pulse (TP), and a plurality of first rotation pulses (NP) during one rotation of a rotating body.
1) a first rotation pulse generator (110) that outputs the first rotation pulse (N) during one rotation of the rotating body.
The number of the second rotation pulses (N
P2), a second rotation pulse generator (120) that outputs the time pulse (TP), and the first rotation pulse (NP).
1) is input and the preceding first rotation pulse (NP1)
And counting the number of inputs of the time pulse (TP) during a period between the first rotation pulse (NP1) and the next rotation pulse (NP1).
A low-speed rotation speed calculation device that calculates and outputs a first rotation speed (NL) indicating the rotation speed of the rotating body based on the count number.
(140), the time pulse (TP) and the second rotation pulse (NP
2) is input and the preceding second rotation pulse (NP2)
And counting the number of inputs of the time pulse (TP) in a period between the second rotation pulse (NP2) and the subsequent rotation pulse (NP2).
A high-speed rotation speed calculation device for calculating and outputting a second rotation speed (NH) indicating the rotation speed of the rotating body based on the count number
(150), the first rotation speed (NL) and the second rotation speed (NH) are input, and the determination rotation speed is set. The values of the rotation speeds (NL) and (NH) are When the rotation speed is equal to or less than the determination rotation speed, the first rotation speed (NL) is output, and the rotation speed (NL),
A rotation speed selection device (160) that outputs a second rotation speed (NH) when the value of (NH) exceeds a determination rotation speed; 2. A time pulse oscillator (130) for outputting a high-frequency time pulse (TP), and a plurality of first rotation pulses (NP) during one rotation of the rotating body.
1) a first rotation pulse generator (110) that outputs the first rotation pulse (N) during one rotation of the rotating body.
The number of the second rotation pulses (N
P2), a second rotation pulse generator (120) that outputs the time pulse (TP), and the first rotation pulse (NP).
1) is input and the preceding first rotation pulse (NP1)
And counting the number of inputs of the time pulse (TP) during a period between the first rotation pulse (NP1) and the next rotation pulse (NP1).
A pulse counter (141) for outputting an integrated pulse number (P1) indicating the counted number; a phase angle measurement commander (190) for outputting a phase angle measurement command (Y) at a predetermined timing; The rotation pulse (NP1), the second rotation number pulse (NP2), and the phase angle measurement command (Y) are input, and the phase angle measurement command (Y) is started from the time when the second rotation pulse (NP2) is input. And a phase angle calculating device (180) which counts the number of inputs of the first rotation pulse (NP1), calculates a phase angle (PH) based on the counted number, and outputs the counted number during a period up to the time when the input is made. The time pulse (TP) and the first rotation pulse (NP
1), the integrated pulse number (P1) and the phase angle measurement command (Y) are input, and from the time when the first rotation pulse (NP1) is input to the time when the phase angle measurement command (Y) is input In the period, the input number of the time pulse (TP) is counted, and the counted number and the integrated pulse number (P1) are counted.
An inter-pulse angle calculation device (200) that calculates and outputs a corrected phase angle (ΔPH) based on the following: and a phase angle (PHS) by adding the corrected phase angle (ΔPH) to the phase angle (PH) And a phase angle calculation output device (210) for obtaining and outputting the rotation angle. 3. A time pulse oscillator (130) for outputting a high-frequency time pulse (TP), and a plurality of first rotation pulses (NP) during one rotation of the rotating body.
1) a first rotation pulse generator (110) that outputs the first rotation pulse (N) during one rotation of the rotating body.
The number of the second rotation pulses (N
P2), a second rotation pulse generator (120) that outputs the time pulse (TP), and the first rotation pulse (NP).
1) is input and the preceding first rotation pulse (NP1)
And counting the number of inputs of the time pulse (TP) during a period between the first rotation pulse (NP1) and the next rotation pulse (NP1).
A low-speed rotation speed calculator (140) for calculating and outputting a first rotation speed (NL) indicating the rotation speed of the rotating body based on the integrated pulse number (P1) indicating the count number; TP) and the second rotation pulse (NP
2) is input and the preceding second rotation pulse (NP2)
And counting the number of inputs of the time pulse (TP) in a period between the second rotation pulse (NP2) and the subsequent rotation pulse (NP2).
A high-speed rotation speed calculation device for calculating and outputting a second rotation speed (NH) indicating the rotation speed of the rotating body based on the count number
(150), the first rotation speed (NL) and the second rotation speed (NH) are input, and the determination rotation speed is set. The values of the rotation speeds (NL) and (NH) are When the rotation speed is equal to or less than the determination rotation speed, the first rotation speed (NL) is output, and the rotation speed (NL),
When the value of (NH) exceeds the determination rotation speed, a rotation speed selection device (160) that outputs a second rotation speed (NH), and a phase angle measurement that outputs a phase angle measurement command (Y) at a predetermined timing A command device (190), the first rotation pulse (NP1), the second rotation speed pulse (NP2), and the phase angle measurement command (Y) are input, and the second rotation pulse (NP2) is input. During the period from the point in time when the phase angle measurement command (Y) is input, the number of inputs of the first rotation pulse (NP1) is counted, and the phase angle (PH) is calculated based on the count number. A phase angle calculating device (180) for outputting the time pulse (TP) and the first rotation pulse (NP)
1), the integrated pulse number (P1) and the phase angle measurement command (Y) are input, and from the time when the first rotation pulse (NP1) is input to the time when the phase angle measurement command (Y) is input In the period, the input number of the time pulse (TP) is counted, and the counted number and the integrated pulse number (P1) are counted.
An inter-pulse angle calculation device (200) that calculates and outputs a corrected phase angle (ΔPH) based on the following: and a phase angle (PHS) by adding the corrected phase angle (ΔPH) to the phase angle (PH) And a phase angle calculation output device (210) for obtaining and outputting the rotation angle. 4. The first rotation pulse generator (110) and the second rotation pulse generator (120) include a gear fitted concentrically with a rotating body and a proximity gear for detecting teeth of the gear. 4. The rotation state detecting device according to claim 1, further comprising a sensor, and outputting the rotation pulses (NP1) and (NP2) each time the proximity sensor detects a gear tooth. 5. The rotation according to claim 2, wherein said phase angle calculation output device comprises a mechanical / electrical angle corrector (212) and a delay time corrector (213). State detection device.