JPS6344199B2 - - Google Patents
Info
- Publication number
- JPS6344199B2 JPS6344199B2 JP57222267A JP22226782A JPS6344199B2 JP S6344199 B2 JPS6344199 B2 JP S6344199B2 JP 57222267 A JP57222267 A JP 57222267A JP 22226782 A JP22226782 A JP 22226782A JP S6344199 B2 JPS6344199 B2 JP S6344199B2
- Authority
- JP
- Japan
- Prior art keywords
- speed
- speed data
- data
- detection signal
- period
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/489—Digital circuits therefor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Linear Or Angular Velocity Measurement And Their Indicating Devices (AREA)
Description
【発明の詳細な説明】
この発明は、被検出回転機などの回転速度を検
出する速度検出方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speed detection method for detecting the rotational speed of a rotating machine to be detected.
従来、被検出回転機の速度検出装置には、電動
機等の回転機に取り付けられた速度発電機などか
ら得られる速度検出信号のパルス列を所定の期間
計数するパルス列計数方式がある。このパルス列
計数方式は、何らかの要因で不正なパルスが入力
されても検出データに与える影響が少ないため、
ノイズ等に対して強いという利点を有するが、そ
の反面、回転機の低速度領域では速度発電機の速
度検出信号のパルス数が減少するため、所望の分
解能が得られないという問題点を有している。 Conventionally, speed detection devices for rotating machines to be detected include a pulse train counting method that counts pulse trains of speed detection signals obtained from a speed generator attached to a rotating machine such as an electric motor for a predetermined period. This pulse train counting method has little effect on the detected data even if an incorrect pulse is input for some reason.
It has the advantage of being resistant to noise, etc., but on the other hand, it has the problem that the desired resolution cannot be obtained because the number of pulses of the speed detection signal of the speed generator decreases in the low speed region of the rotating machine. ing.
そこで、回転機の低速度領域で速度検出信号の
周期を計測し、周期データの逆数値を演算するこ
とにより速度データを得る周期計測方式を用いる
と、ノイズ等による不正な入力パルス信号が混入
した場合、周期データを誤計測する。 Therefore, when using a period measurement method that obtains speed data by measuring the period of the speed detection signal in the low speed region of the rotating machine and calculating the reciprocal value of the period data, incorrect input pulse signals due to noise etc. may be mixed in. If so, the cycle data will be incorrectly measured.
第１図は、周期計測方式における誤計測状態を
示す説明図であり、図において、P1，P2，P3は
計測された周期Ｔのパルス、PXは不正パルスを
示す。 FIG. 1 is an explanatory diagram showing an erroneous measurement state in the period measurement method. In the figure, P 1 , P 2 , and P 3 represent measured pulses with a period T, and P X represents an incorrect pulse.
第１図に示すように、不正パルスPXがパルス
P1，P2の間の周期Ｔ／２の部分に混入すると、
周期をＴ／２と計測するので、結果として速度デ
ータは実際の速度の２倍もしくはそれ以上の速度
データとなるため、前述したパルス列計数方式に
比べてノイズ等の影響を受け易いという問題点を
有している。 As shown in Figure 1, the illegal pulse P
When mixed in the period T/2 part between P 1 and P 2 ,
Since the period is measured as T/2, the resulting speed data will be twice or more than the actual speed, so this method has the problem that it is more susceptible to noise etc. than the pulse train counting method mentioned above. have.
この発明は、上記のような問題点を解消するた
めになされたもので、パルス列計数方式の利点と
周期計測方式の利点とを組み合わせることによ
り、ノイズ等の影響を排し、しかも低速度領域に
おいても高い分解能を維持することができる速度
検出方式を得ることを目的とする。 This invention was made to solve the above-mentioned problems, and by combining the advantages of the pulse train counting method and the period measurement method, it eliminates the effects of noise etc. The objective is to obtain a speed detection method that can maintain high resolution.
以下、この発明の一実施例を図について説明す
る。 An embodiment of the present invention will be described below with reference to the drawings.
第２図はこの発明の一実施例による速度検出方
式を示すブロツク構成図であり、図において、１
は被検出回転機となる電動機、２は速度検出用の
速度発電機、３は周期計測回路、４は逆数演算回
路を示し、周期計測回路３と逆数演算回路４とに
より第１の速度演算ユニツトＡが構成されてい
る。５は発振器、６はパルス積算回路を示し、発
振器５とパルス積算回路６とにより第２の速度演
算ユニツトＢが構成されている。 FIG. 2 is a block diagram showing a speed detection method according to an embodiment of the present invention.
2 is a speed generator for speed detection, 3 is a period measuring circuit, and 4 is a reciprocal calculation circuit. The period measurement circuit 3 and the reciprocal calculation circuit 4 form a first speed calculation unit. A is configured. Reference numeral 5 indicates an oscillator, and 6 indicates a pulse integration circuit. The oscillator 5 and the pulse integration circuit 6 constitute a second speed calculation unit B.
７は比較回路、８は選択回路、９は速度データ
を出力する出力端子、ｖは電動機１の速度検出信
号、ａ，ｂは第１、第２の速度演算ユニツトＡ，
Ｂの各速度データを示す。 7 is a comparison circuit, 8 is a selection circuit, 9 is an output terminal for outputting speed data, v is a speed detection signal of the motor 1, a, b are first and second speed calculation units A,
Each speed data of B is shown.
次に、動作について説明する。 Next, the operation will be explained.
速度発電機２から出力される電動機１の速度検
出信号ｖは、第１、第２の速度演算ユニツトＡ，
Ｂに供給される。 The speed detection signal v of the electric motor 1 output from the speed generator 2 is sent to the first and second speed calculation units A,
B is supplied.
第１の速度演算ユニツトＡでは、周期計数回路
３で速度検出信号ｖを計数し、その計数結果より
算出した周期データ信号が逆数演算回路４へ出力
され、この周期データ信号の逆数演算を行つた結
果を第１の速度データａとして出力する。 In the first speed calculation unit A, a period counting circuit 3 counts the speed detection signal v, and a period data signal calculated from the counting result is outputted to a reciprocal calculation circuit 4, which performs a reciprocal calculation of this period data signal. The result is output as first speed data a.
また、第２の速度演算ユニツトＢでは、所定周
期のパルス列出力信号を発生する発振器５のパル
ス列出力信号と、速度検出信号ｖとがパルス積算
回路６に供給され、発振器５からのパルス列出力
信号の２つのパルス信号の間に生ずる速度検出信
号ｖを積算することにより、その積算値を第２の
速度データｂとして出力する。 Further, in the second speed calculation unit B, the pulse train output signal of the oscillator 5 that generates a pulse train output signal of a predetermined period and the speed detection signal v are supplied to the pulse integration circuit 6, and the pulse train output signal from the oscillator 5 is By integrating the speed detection signals v generated between the two pulse signals, the integrated value is output as second speed data b.
そして、第１の速度演算ユニツトＡの第１の速
度データａと、第２の速度演算ユニツトＢの第２
の速度データｂとが入力される比較回路７は、両
速度データａ，ｂの間に著しく大きな差が生じた
ときは不正パルスが発生したものとみなし、ノイ
ズ等の影響に強い第２の速度演算ユニツトＢから
の第２の速度データｂを速度データとして指定す
る指定出力信号を選択回路８へ送出する。 Then, the first speed data a of the first speed calculation unit A and the second speed data a of the second speed calculation unit B are
The comparator circuit 7 to which the speed data b and the speed data b are input considers that an illegal pulse has occurred when there is a significantly large difference between the speed data a and b, and selects a second speed that is more resistant to the effects of noise etc. A designation output signal designating the second speed data b from the arithmetic unit B as speed data is sent to the selection circuit 8.
したがつて、両速度データａ，ｂが入力されて
いる選択回路８では、指定出力信号を受けて第２
の速度データｂのみを選択して出力し、出力端子
９には第２の速度データｂが出力される。 Therefore, in the selection circuit 8 to which both speed data a and b are input, the second
The second speed data b is selected and outputted to the output terminal 9.
また、両速度データａ，ｂの差が小さいとき
は、比較回路７からより高い分解能の速度データ
が得られる第１の速度演算ユニツトＡからの第１
の速度データａを速度データとして指定するの
で、選択回路８で選択された第１の速度データａ
が出力端子９に出力される。 Further, when the difference between both speed data a and b is small, the first speed data from the first speed calculation unit A, which can obtain speed data with higher resolution from the comparator circuit 7, is
, the first speed data a selected by the selection circuit 8 is designated as the speed data.
is output to the output terminal 9.
なお、先に述べた第２の速度データｂが速度デ
ータとして選択されるときは、不正パルスが発生
したときなので、電動機１の低速度領域で主に選
択される。 Note that when the second speed data b mentioned above is selected as the speed data, it is when an illegal pulse is generated, so it is mainly selected in the low speed region of the electric motor 1.
以上のように、この発明の速度検出方式によれ
ば、速度検出信号の周期を計測する周期計測方式
と速度検出信号のパルスを計数するパルス列計数
方式とを組み込み、両方式の速度データを両速度
データの差に応じて選択して速度データとしてい
るので、低速度領域においても誤計測することな
く高分解能が維持でき、全速度領域に亘つてノイ
ズ等の影響を受けずに高分解能な速度検出を達成
することができる効果がある。 As described above, according to the speed detection method of the present invention, the period measurement method for measuring the period of the speed detection signal and the pulse train counting method for counting the pulses of the speed detection signal are incorporated, and the speed data of both methods is used for both speeds. Since the speed data is selected according to the difference in data, high resolution can be maintained without erroneous measurements even in low speed ranges, and high resolution speed detection is possible without being affected by noise etc. over the entire speed range. There is an effect that can be achieved.
第１図は従来の周期計測方式の速度検出装置に
おける計測状態を示す説明図、第２図はこの発明
の一実施例による速度検出方式を示すブロツク構
成図である。
図において、１は電動機、２は速度発電機、３
は周期計測回路、４は逆数演算回路、５は発振
器、６はパルス積算回路、７は比較回路、８は選
択回路、Ａ，Ｂは第１、第２の速度演算ユニツ
ト、ａ，ｂは第１、第２の速度データ、ｖは速度
検出信号を示す。
FIG. 1 is an explanatory diagram showing a measurement state in a conventional periodic measurement type speed detection device, and FIG. 2 is a block diagram showing a speed detection method according to an embodiment of the present invention. In the figure, 1 is an electric motor, 2 is a speed generator, and 3
4 is a period measuring circuit, 4 is a reciprocal calculation circuit, 5 is an oscillator, 6 is a pulse integration circuit, 7 is a comparison circuit, 8 is a selection circuit, A and B are first and second speed calculation units, a and b are the first 1. Second speed data, v indicates a speed detection signal.
Claims (1)
どから得られる速度検出信号を入力として前記速
度検出信号の周期を計測することにより第１の速
度データを演算する第１の速度演算ユニツトと、
前記速度検出信号を入力として所定の期間前記速
度検出信号のパルス数を積算して第２の速度デー
タを演算する第２の速度演算ユニツトと、前記第
１、第２の速度演算ユニツトより出力される前記
両速度データを比較する比較回路と、この比較回
路で前記両速度データを比較した結果、前記両速
度データの差が一定値より小さい場合は前記第１
の速度データを出力し、前記両速度データの間に
一定値以上の差が生じたときは前記第２の速度デ
ータを出力する選択回路とを備えた速度検出装
置。1. A first speed calculation unit that calculates first speed data by inputting a speed detection signal obtained from a speed generator or the like attached to a rotating machine to be detected and measuring the period of the speed detection signal;
a second speed calculation unit that receives the speed detection signal as input and calculates second speed data by integrating the number of pulses of the speed detection signal for a predetermined period; and a comparator circuit that compares the two speed data, and as a result of comparing the two speed data with this comparison circuit, if the difference between the two speed data is smaller than a certain value, the first
and a selection circuit that outputs the second speed data when a difference of more than a certain value occurs between the two speed data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22226782A JPS59109867A (en) | 1982-12-15 | 1982-12-15 | Speed detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22226782A JPS59109867A (en) | 1982-12-15 | 1982-12-15 | Speed detection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59109867A JPS59109867A (en) | 1984-06-25 |
| JPS6344199B2 true JPS6344199B2 (en) | 1988-09-02 |
Family
ID=16779704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22226782A Granted JPS59109867A (en) | 1982-12-15 | 1982-12-15 | Speed detection system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59109867A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05264797A (en) * | 1992-03-17 | 1993-10-12 | Hitachi Ltd | Method and device for beam irradiation |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0716555B2 (en) * | 1985-06-24 | 1995-03-01 | 松下電器産業株式会社 | Sewing machine controller |
| JPS6393555U (en) * | 1986-12-08 | 1988-06-16 | ||
| JPH03167476A (en) * | 1989-11-27 | 1991-07-19 | Stanley Electric Co Ltd | Number of rotations indicator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5160574A (en) * | 1974-11-25 | 1976-05-26 | Mitsubishi Heavy Ind Ltd | Sokotaino sokudosokuteisochi |
| JPS53143378A (en) * | 1977-05-20 | 1978-12-13 | Hitachi Ltd | Speed counting system |
| JPS5537707A (en) * | 1978-09-07 | 1980-03-15 | Toshiba Corp | Index signal detecting device |
| JPS57189588A (en) * | 1981-05-18 | 1982-11-20 | Fanuc Ltd | Speed detecting system |
-
1982
- 1982-12-15 JP JP22226782A patent/JPS59109867A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05264797A (en) * | 1992-03-17 | 1993-10-12 | Hitachi Ltd | Method and device for beam irradiation |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59109867A (en) | 1984-06-25 |
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