JPS60143777A - Apparatus for measuring rotation number - Google Patents

Abstract

PURPOSE:To make it possible to measure a rotation number ranging from a low speed region to a high speed region by one detector and to make the titled apparatus inexpensive while performing measurement with high accuracy, by measuring the rotation number of the low speed region by measuring the pulse interval of a pulse signal. CONSTITUTION:In a low speed region, the data of a cycle counter 19 is stored in a register 20 at the rising of the pulse signal outputted from a wave form shaping device 10 and the counter 19 is reset from a delay monostable multivibrator 18. This counter 19 counts the pulse of a clock generator 12 until the next reset signal comes. This cycle information is read by a rotation number measuring instrument 22 to measure a rotation number. Next, in a high speed region, the pulse signal outputted from the shaping device 10 is preset to a cycle counter 13 and a pulse number is counted by a pulse counter 14 while the count value is stored in a register 15 at every cycle. A change-over signal device 17 outputs a change-over signal to a change-over device 21 and the rotation number measuring instrument 22 when the data value of the register 15 reaches a set value or more to change over both of them to a high speed region measuring side and the rotation number is measured through the measuring instrument 22.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to turbines, pumps, blowers, compressors,
The present invention relates to a rotation speed measuring device that measures the rotation speed of rotating machines such as generators and motors over a wide range from low speed to high speed.

[Prior art]

#The nine vines of the 16-tooth flute IFWlr of Saito no Tsu. In the figure, (υ is a rotating gear fixed to the shaft of a rotating machine, (2n is a sensor installed opposite the rotating gear position,
(3) is a low-speed rotary gear with a large number of teeth and wheels to detect rotational speed in the low-speed range, (4) is a low-speed sensor, (
6) is a detector that detects the change in the gap between gear wax υ and sensor (2) or low speed gear (3) and low speed sensor (4) as an electrical signal, (6) is an amplifier, and (7) is a detection A signal level setter (8) is used to compare the signal from the amplifier (6) and the signal from the signal level setter (7) and output a pulse depending on the size. The circuit (9) is a rotational speed measuring device that counts two pulse signals, one for low speed and one for high speed, and measures the rotational speed for each.

Next, the operation will be explained.

The gap between the rotary gear 11 fixed to the shaft of the rotary machine and the low-speed gear (3) changes as the shaft of the rotary machine rotates due to the sensor (2) and low-speed sensor (4) installed facing each other. The detector +5) detects the displacement of this gap as an electrical signal, and further inputs it to the signal comparison circuit (8) via the amplifier (6). Signal comparison circuit (8)
Now, the signal from the amplifier (6) and the signal level setter (7)
It compares the reference signals from the engine and determines the magnitude, and sends the output signal shaped as a pulse signal to the rotation speed measuring device (9).
``The rotational speed measuring device (9) measures the rotational speed by counting how many pulses of the pulse signal from the signal comparison circuit (8) are input within a certain period of time. The rotation speed is expressed by the following formula.

When measuring rotational speed in a low speed range, a device with a large number of gears is used, and in a high speed range, a device with a small number of gears is used to display each.

Conventional rotational speed measurement devices are configured as described above, so in order to measure rotational speed over a wide range, a low-speed circuit with many gears and a high-speed circuit with a small number of gears are provided. It is necessary to select the instruction with higher precision in response to the measurement, and there are also drawbacks such as being expensive because it requires two circuits.

[Summary of the invention]

This invention was made to eliminate the drawbacks of the conventional ones as described above, and by measuring the pulse interval of the pulse signal and measuring the rotation speed in the low speed range, it is possible to measure the rotation speed in a wide range with one gear. The purpose is to provide a rotation speed measuring device that can measure rotation speed.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 2, the waveform i is a waveform i that shapes the displacement signal detected by the sensor 12) from the unevenness of the gear U) into a pulse signal, αυ is the time setting device that determines the time to count the number of pulses, and the Clock generator, a field is a period counter, uya is a pulse counter, ni) is a register, al is a switching speed setting device that sets the rotation speed to switch to high-speed rotation speed measurement by pulse counting, a is a changeover of the measurement method. The switching signal b1 (to) that outputs the signal is a delay monomulti, 01 is a period counter, (A) is a register, 3◇ is a switch)
is a rotation speed measuring device.

FIG. 8 shows a method of measuring the rotational speed, and FIG. 8(a) is a timing chart showing the rotational speed measurement in a low speed range, and the eighth factor (off) is a timing chart showing the rotational speed measurement in a high speed range.

Next, the operation will be explained.

Waveform shaping fl! The /f pulse signal output from Ill causes the data of the period counter (6) to be stored in the register at the rising edge of this signal in the low speed range. Immediately after completing this task, start the period counter from the delay monomulti Q19.

(Reset I.Reset period counter・Q
l counts the pulses of the clock generator the until the next reset signal arrives.

That is, period information is stored in the register for each period of the pulse signal.

The rotation speed measuring device reads this period information and performs the following calculation to measure the rotation speed.

Waveform shaping in the high-speed range The pulse signal output from Chimoe is calculated by counting the number of pulses within a preset period of time using the period counter (to). L-mother-in-law 91 ba 51 - Hesdoor. The switching signal Q outputs a switching signal to the register (when the data value of Vj and the setting value of the switching speed setting device αQ are compared and the count value exceeds the setting value, the switching signal EL is sent to the rotation speed measuring device). to switch the rotation speed measurement to the high speed range measurement side.

This pulse count information is read by a rotation speed measuring device) and the following calculation is performed to measure the rotation speed.

In the above embodiment, a switch Q9 is provided to change the rotation speed measurement to 1.
Although this is done using one signal, it is also possible to input two signals for low speed range and high speed range to the rotation speed measuring device and display two signals.

Further, in the above embodiment, the signals are switched, but it is also possible to select and display the calculation results of each rotation speed, or to output the rotation speed signals to the outside.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to measure the rotational speed in a wide range from low speed range to high speed range with one detector, so the device can be made at low cost, and it is possible to obtain high accumulation. be.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the system configuration of a conventional rotation speed measuring device, FIG. 2 is a block diagram showing the system configuration according to an embodiment of the present invention, and FIGS. FIG. 3 is a timing diagram showing the operation. (υ...°gear, (2)°...sensor, (3)...low speed gear, (4)...low speed sensor, (5)...detector, (6)... Amplification width 84, (7)...Signal level setter, (8)...Signal comparison circuit, (9)...Rotation speed measuring device, (4)...Waveform shaper, (B)... Time setting device, (2)...Clock generator, So...Period counter, u41...Pulse counter, (6)...Register, Output...Switching speed setting device, α訃...Switching ( Route 2, (G)...Delay monomulti, (6)...Period counter, (7)...Register, 0υ...Switcher, (
2)...Rotation speed measuring device. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1

Claims (1)

[Claims] To measure the rotational speed, an AM pickup is used, which is placed opposite the circumferential surface of a gear disk fixed to the rotating shaft of the rotating body, and a pulse signal is generated by passing through a slot. A rotational speed measurement device that detects the rotational speed based on the time of , and changes the signal to detect the rotational speed based on the number of pulses per unit time in a high speed range above a certain speed.