SU1721776A1 - Gated electric drive unit - Google Patents

Abstract

The invention can be used in automatic devices for various purposes with digital control. The purpose of the invention is to simplify the valve motor drive. The valve drive contains a master frequency generator 1, the output of which is connected via frequency divider 2 to the input of a permanent storage device 3 consisting of a block of permanent memory devices and a block of characters. The output of the generator 1 is connected to the input of a controlled frequency divider 4, -СSty / 7 / 4y "e N4 H) vj S g

Description

1

the input input of which is intended to supply a control action code, and the output is connected to the clock inputs of a pulse width modulator unit 5, the information inputs of which are connected to the outputs of the permanent storage device 3. The outputs of the storage device 3 are connected to the inputs of the reverse control unit b, the control input of which is connected to the sign bit of the control action, and the outputs are connected to the sign inputs of the semiconductor switch 7, other inputs

which are connected to the outputs of the block 5 pulse-width modulators, the outputs of the switch 4 are connected to the phase windings of the synchronous machine 8, on the shaft of which the phase shifter 9 is fixed. The inputs of the phase shifter 9 are connected via the block 11 of digital-analog converters to the outputs of the permanent storage device 3, and the output of the phase shifter 9 is connected via the null organ 10 to the inputs of the load enable or the block 5 of the pulse-width modulators. 2 Il.

The invention relates to electrical engineering, in particular to actuating valve actuators, and can be used in automatic devices for various purposes with digital control.

The closest in technical essence to the present invention is a valve electric drive comprising a t-phase synchronous machine, a switch, a phase shifter, a sinusoidal voltage source, a divider, a master oscillator, a zero-body, a storage node, a pulse-width modulator, a reverse control unit, memory register and block of characters of phase voltages.

; The disadvantage of this device is the low accuracy due to the precision powered phase sensor. It is known that in order to obtain maximum accuracy it is necessary to form precision feeding voltages of the phase shifter. However, in the electric drive under consideration, this will lead to its substantial complication ..

The purpose of the invention is to simplify the valve motor drive.

Figure 1 shows the structural diagram of the proposed valve actuator; figure 2 - timing charts of his work.

The valve actuator (Fig. 1 contains a master frequency generator 1, the output of which is connected via frequency divider 2 to the inputs of a permanent storage device 3, consisting of a block of permanent memory devices of the character block. In addition, the generator output 1 is connected to the input of a controlled divider 4 frequencies, to the load inputs of which the control action code is applied, and the output is connected to the clock

the inputs of the block 5 are pulse-width modulators, the information inputs of which are connected to the outputs of the permanent storage device 3.

Memory Outputs 3

are connected to the inputs of the reversal control unit 6, the control input of which is connected with the sign bit of the control action, and the outputs are connected to the sign inputs of the semiconductor switch 7, the other inputs of which are connected to the outputs of the block 5 of pulse width modulators. The outputs of the switch 7 are connected to the phase windings of the synchronous machine 8, on the shaft of which a phase shifter 9 is mounted, made with electrical reduction, the coefficient of which is equal to the number of pole pairs of the electric machine. Phase Inverter 9 Inputs Through

the digital-to-digital converter unit 11 is connected to the outputs of the persistent storage device 3, and the output of the phase shifter 9 is connected via the null organ 10 to the load enable inputs of the block 5 of the pulse-width modulators.

The valve actuator operates as follows.

A frequency divider 2, which is an n-bit binary counter, divides

frequency of the master oscillator 1 fo 2p times. The output code AN of the frequency divider 2 is fed to the address inputs of the persistent storage device 3, including the block of characters of the phase voltages. Codes are written in it, and in the block of signs, the polarity signs of the t-harmonic functions shifted by 2 / m radians are one relative to the other (m is the number of CM8 phases). The output signals of the memory device 3 digital-to-analog converters are fed to the inputs of block 11, where they are converted into precision sinusoidal

voltages that are fed to the inputs of the phase shifter 9. The output signal of the phase shifter 9 ivy is fed to the null organ 10. From the output of which is the Do square meander of the same frequency. The output code of the storage device 3 of the block 5 of the pulse-width modulators is recorded on the front of the output signal of the zero-organ 10. The block 5 of the pulse-width modulators converts the codes A sinl, D sln2, D sln3 arriving at their inputs pulsed modulated sequences T1, ta, gz. The duration of each pulse of these sequences will be defined as

Asini t - -E-G-

TRDD

where D sin j is the output code of the 1st ROM at the moment when the input of the parallel load PWM 5 of the U0 signal front arrives at the input;

fo- frequency of the master oscillator; Control dd code. The sequences ri, mt, m3 are passed to the inputs of the switch 7, the sign of their polarity being determined by the signals at the sign inputs of the switch that are connected to the outputs of the reverse control control unit 6, the information inputs of which are connected to the outputs of the character block of the memory device 3 and the input to the control is sign

control action.

Thus, the block of digital-to-analog converters 11 continuously reads the code and polarities of the t-harmonic functions recorded in them from the outputs of the storage device 3 and converts them into a system of t-sinusoidal voltages, which are the supply voltage of the phase shifter 9. Writing the code from the storage device 3 to the pulse width modulator 5 is carried out once per period of the supply voltage of the phase shifter 9. Moreover, the code value

D sin I block 5, received at the inputs of pulse-width modulators, uniquely

but is determined by the position of the rotor of the synchronous machine 8, and with appropriate installation of the phase shifter 9 sets the orientation of the magnetic field of the stator of the machine, ensuring the perpendicularity of the magnetic field

5 0 5

five

0 5

n and

five

stator magnetic field to the rotor magnetic field in all its positions.

Figure 2 shows the timing diagrams of the main coordinates of the valve actuator at two different (but fairly close) positions of the rotor of the synchronous machine.

The reverse in the proposed valve drive is carried out using the reverse control control unit 6 when changing the sign of the control signal A g by simultaneously replacing the signs of the phase voltages of the synchronous machine 8 sign 1, sign 2, sign 3 with opposite ones.

The valve motor can be effectively used as an actuator for high-precision digital automatic control systems.

Claims (1)

Invention Formula A valve actuator containing a synchronous machine, on the shaft of which a phase shifter is mounted, a semiconductor switch, the control inputs of which are connected to the outputs of pulse width modulators / sign inputs - to the outputs of the reverse control unit, and the outputs to phase outputs of the synchronous machine core winding, constant This memory device is connected to the inputs of pulse width modulators, the clock inputs of which are connected to the output of a controlled frequency divider, the input of which is combined with the input a frequency divider and is connected to the output of the pulse generator, and the input of the load serves to supply the control code, a block of characters whose input is connected to the input of a permanent storage device, and an output to the inputs of the reversal control unit, a zero-organ input connected to the output of the phase rotator which is different because, for the sake of simplicity, digital-analogue converters are introduced, the analog inputs of which are connected to the outputs of a block of characters, and the digital inputs to the outputs of a permanent storage device whose input oedinen yield frequency divider and the output of zero-body is connected to the load enable input pulse width modulators. L8SH / 1-Ј-