SU911483A1 - Motor rotational speed stabilizer - Google Patents

Description

(54) ENGINE RPM STABILIZER

.. I

The invention relates to automation and can be used in low-power tape mechanisms for stationary speeds of tape movement.

A stabilizer of rotational speed of a direct current motor is known, which was completed on the principle of phase-locked loop speed. In this case, the motor control is performed as a function of the phase mismatch of the frequency generated by the pulse speed sensor located on the motor shaft and the frequency of the master oscillator, and the trigger 1 is the body performing the comparison function.

Such a stabilizer possesses insufficient stability and operation stability, since in transient conditions it is possible to break the regulation and transition the engine speed to values that are multiples of the given one.

The engine speed regulator is known, which contains a quartz oscillator of Ci pulses, a pulse speed sensor mounted on an engine shaft, a motor control device, a circuit and a reversing counter. In this station & switch, the electric motor is switched on and off according to the phase difference sign of the compared frequencies, which eliminates the possibility of increasing the engine speed above a given 2.

However, the disadvantage of this stabilizer is the insufficient acceleration rate of the engine in transients due to

10 that the control device switches off the engine after each pulse from the pulse sensor to the reversing counter.

The purpose of the invention is to reduce the time

IS engine acceleration in transient conditions.

Claims (2)

This goal is achieved by the fact that a known stabilizer containing a quartz oscillator of synchronizing pulses, a pulse speed sensor mounted on the motor shaft, element I, a reversible counter and a control unit output connected to the digitizer, has a trigger, the output of which is connected to the pen 39. the input of the element I, the second input of which is connected to the output of a quartz oscillator of synchronizing pulses, and the output to the first counting input of a reversible counter, the first output of which is connected to the first input of the control unit, the output of the pulse turn-on sensor and to the second counting to the input of the reversible counter, the second output connected to the second input of the control unit and the second Fault trigger. The drawing shows a functional diagram of the proposed stabilizer. The device consists of a quartz oscillator 1 of synchronizing pulses, the pulses from which, through the element I 2, are applied to one of the counting inputs of the reversible counter 3. To the other input of the element 2, the output of the trigger 4 is connected. One of the outputs of the reversing counter 3 is connected to the first input of the unit 5 control, which controls the operation of the engine 6 (connects or disconnects it from the power source). Another output of the reversible counter 3 is connected to the second input of the control unit 5 and to the first input of the trigger 4. The output of the rotational speed sensor 7 is connected to the second input of the trigger 4 and to the second counting input the reverse of the counter 3. The stabilizer works as follows. When entering and counting, the input (subtracting) of the reversible counter 3 of the pulse from the clock generator 1 preset to zero, the counter 3 goes into a state in which a transfer pulse appears at the corresponding output, transferring the control unit 5 to the position corresponding to switching on the motor 6. Next, the counter 3 counts the number of pulses that came from generator 1 during the time from the moment the engine 6 was turned on until the moment when the pulse appeared at the output of the sensor 7 revolutions. goes to a state that excludes the passage of pulses from generator 1 through element I 2 to counter 3 Engine 6 is in acceleration until the number of pulses received by counter 3 from sensor 7 is equal to the number of pulses recorded in account 4 In this case, at the corresponding output of the counter 3, the transfer pulse is turned on, switching the control unit 5 to the position to which the engine 6 is turned off, and the trigger 4 is set to the state in which the pulses from the generator 1 again receive the opportunity to enter pass through the element AND 2 to the counter 3. The process repeats until the frequency of the pulses from sensor 7 becomes equal to the frequency of the generator 1 of clock pulses. The use of the present invention will allow reducing the engine acceleration time in transient conditions several times in comparison with the lime stabilizer, as well as increasing the stability and stability of the stabilizer by eliminating the possibility of the engine speed switching to values corresponding to purities lower than the specified one. Claims An engine speed stabilizer comprising a quartz pulse sync generator; impulse speed sensor mounted on the motor shaft, element I, reversible, counter and control unit connected to the engine, which is limited by the fact that, in order to reduce the engine acceleration time in transient conditions, it contains a trigger, the output of which is connected to the first input of the element I, the second input of which is connected to the output of the quartz oscillator of synchronizing pulses, and the output to the first counting input of the reversible counter, the first output of which is connected to the first input of the control unit, the output of which ulsnogo revolutions sensor is connected to a first input of the flip-flop and to a second count input of down counter, a second output connected to the second input upravleii unit and the second input latch. Sources of information taken into account during the examination 1. USSR author's certificate No. 372631, cl. H 02 R 5/06, 1971. 2. USSR author's certificate No. 531138, .kl. G P5 D 13/00, 1974 (prototype).