SU964539A2

SU964539A2 - Digital tachometer

Info

Publication number: SU964539A2
Application number: SU802994667A
Authority: SU
Inventors: Евгений Михайлович Казанцев; Николай Владимирович Кирианаки
Original assignee: Львовский Ордена Ленина Политехнический Институт Им.Ленинского Комсомола
Priority date: 1980-10-20
Filing date: 1980-10-20
Publication date: 1982-10-07

Description

Изобретение относитс к приборостроению и может быть использовано дл измерени частоты и направлени вращени с представлением результата в цифровой форме.The invention relates to instrument engineering and can be used to measure the frequency and direction of rotation with the result presented in digital form.

По основному авт. св. 881619 известен цифровой тахометр, содержащий генератор импульсов,, выход которого через первый управл екый делитель частоты и формирователь синусоидальных .напр жений соединен с фазовращателем, ротбр которогчэ св - , зан с исследуемым объектом, а выход через формирователь импульсов,. второй управл емый делитель частоты соединён с первым входом ключа, второй вход которого подклйчен к выходу генератора импульсов, а вы- , ход - к входу вычитающего счетчика импульсов, и блок управлени делител ми , входы которого подключены к вы .ходам счетчика, а выходы - к упрарл ющим .входам делителей частоты р.J.According to the main author. St. 881619 a digital tachometer is known, containing a pulse generator, the output of which is connected to a phase shifter through a first controllable frequency divider and a sinusoidal voltage driver, and a output device is connected to the phase shifter. The second controlled frequency divider is connected to the first key input, the second input of which is connected to the output of the pulse generator, and the output, the turn to the input of the subtractive pulse counter, and the divider control unit, whose inputs are connected to you of the counter counters, and the outputs to the control inputs of the frequency dividers R.J.

Недостатком устройства вл етс невозможность измерени частоты Bjpaщени при изменении направлени вращени .A disadvantage of the device is the impossibility of measuring the frequency Bj of frequency data when changing the direction of rotation.

Делью изобретени вл етс расширение функциональных возможностей за счет измерени частоты вращени The purpose of the invention is to extend the functionality by measuring the rotational speed

при изменений направлени вргицени с одновременны определением направлени .with changes in direction, while simultaneously determining direction.

Поставленна цель достигаетс тем, что в устройство введены триггер со счетным входом, подключенным к выходу счетчика, и ко1««утатор фаз, включенный между формирователем синусоидальных нгшр жевий и The goal is achieved by introducing a trigger with a counting input connected to the output of the counter and a coral phase switch connected between the sinusoidal driver and

10 фазовращателем, причем управл ющие входы коммутатора фаз соединены с выходами триггера.10 with a phase shifter, the control inputs of the phase commutator being connected to the trigger outputs.

На чертеже представлена схема цифрового тахометра.The drawing shows a diagram of a digital tachometer.

1515

. Цифровой тахометр содержит генератор 1 импульсов, выход которого через первый управл емый делитель 2 частотых.формирователь 3 синусоидальных напр жений, коммутатор 4 фаз, . The digital tachometer contains a generator of 1 pulses, the output of which through the first controlled divider is 2 frequency. The generator of 3 sinusoidal voltages, the switch 4 phases,

20 фазовращатель 5, формирователь 6 импульсов, второй управл емой делитель 7 частоты и ключ 8 соединен с входом вычитающего счетчика 9.20 a phase shifter 5, a pulse former 6, a second controlled frequency divider 7, and a switch 8 connected to the input of the subtracting counter 9.

Второй вход ключа 8 непосредствен25 но св зан с вы содом генератора 1 информационными входами блока 10 управлени делител ми, з его два ynpaqл ющих выхода подключены к управл ющим входам делителей 2 и 7. Выход The second input of the key 8 is directly connected to the output of the generator 1 by the information inputs of the divider control unit 10, from its two operating outputs connected to the control inputs of dividers 2 and 7. The output

Claims

A counter zero reset 9 is associated with the counting input of trigger 11, and the output of the latter is c. two indicators 12 and 13 of the direction of rotation and a 4-phase switch. The paeojaeT device is as follows. Generator 1 generates pulses that are divided by divider 2 and then fed to shaper 3, which, depending on the type of phase shifter used, generates two or more sinusoidal voltages to form a circular rotating electromagnetic field with a frequency of rotation f. When the rotor rotates the phase shifter 5 in the direction opposite to the direction of rotation of the electromagnetic field, a voltage / frequency f in its output winding is equal to the sum of frequencies fj, and f is the frequency of rotation of the rotor of the phase shifter 5. shaper 6 to frequency divider 7, the division factor of which is set by block 10, and open key 8 for a time equal to, for example, one period T of frequency f, Pulses with frequency f of generator p. 1 are fed to the input of deducting counter 9, in which m before the measurement starts, the number ttg-f / f is written. At the end of the period T, the number N N - Tf will be fixed in the counter. If we accept that fy / f "1, then we can write 2-. f A. f When the rotor of the phase shifter rotates in the direction coinciding with the direction of rotation of the electromagnetic field, a voltage is induced in the output winding, the frequency f of which is equal to the difference in the frequency of rotation of the electromagnetic field fj. and fy of the rotation frequency of the rotor of the phase shifter, the number N 0 -A-f will be recorded in the counter. The minus sign in this expression corresponds to the fact that the counter has been reset, and since it is subtracting, the result will be fixed in the additional code, which makes it difficult to read. To eliminate this undershoot, the impulse to zero the counter 9 is fed to the counting input of the trigger 11. and transfers it. The corresponding pulse from one of the outputs of the trigger 11 is supplied to the 4-phase switch, which in turn changes the phase shift in the supply windings of the phase detector so that it forms a rotating electric field with the direction of rotation opposite to the direction of rotation of the rotator of the phase shifter. For example, in a two-phase phase shifter, it suffices to change the phase shift in the supply voltages from +90 to -90. The trigger state 11 uniquely identifies the direction of rotation of the rotor and is indicated by indicators 12 and 13. Thus, the digital tachometer measures the frequency of rotation with any direction of rotation and generates signals of the direction of rotation. The invention of the digital tachometer auth. ev f 881619, differing in heme, that, in order to expand its functionality by measuring the rotational frequency when changing the direction of rotation while determining the direction, a trigger with a counting input connected to the output of the counter and a phase switch connected between the driver were inserted into it sinusoidal voltages and a phase shifter, and up. the equal inputs of the phase switch are connected to the trigger outputs. Sources of information taken into account in the examination 1. USSR author's certificate 881619, cl. G 01 P 3/489, 15.02.80 (prototype).