SU716627A1 - Apparatus for power supply of piezoelectric vibration motor - Google Patents

Description

  t; : -; - The invention relates to a device structure and can be used to power piezoceramic and magnetostrictive transducers, vibromotors. Devices for power supplies (piezoelectric transducers) are known that contain an engine speed sensor connected via a frequency detector with a controlled alternating voltage generator connected to piezoceramic plates between which the C-shaped resonator is reinforced. L. It is TOMi that they do not provide power for the piezoceramic transducer during the transient process in the step-by-step mode. This is a device for powering the piezoelectric transducer of the vibromotor, containing a series-connected control unit, an alternating current geyrator, a power amplifier and a piezoceramic transducer, coupled to the rotor of the vibromotor and connected to the input of the amplifier, pulse shaper, AND-NOT circuit and a four-diode key, at the output of which capacitor 2 is turned on. However, this device has insufficient accuracy in adjusting the angular velocity of the rotor of the vibromotor, especially in the start- topnom mode and a low speed in start mode. The purpose of the invention is to increase efficiency. This is achieved by tem | that a countable trigger, two minimum and maximum pulse formers, three AND – NOT circuits, four inverters, two T griggers, two reference voltage blocks, a reference generator, a linearly rising voltage generator, and 6.v (bejjny amplifier. The control unit contains three fans. The output of the amplifier is connected to the input of the counting trigger, the direct output of which is connected to the first inputs of the first and second I-NOT and 5 circuits

the inputs of two pulse shapers of minimum and maximum duration, the outputs of which are connected to the first outputs of the third and fourth Y-NOT circuits respectively and through the first 10 and second inverters to the second inputs of the first and second I-NI circuits, respectively, whose outputs are connected to the inputs of the zero setting respectively first and second. T-flip-flops, connected by the unit installation inputs to the outputs of the third and fourth AND-NOT circuits, the second inputs of which are connected to the zero output of the counting trigger and the first input of the linear-increasing voltage generator, the second input of which is connected to one output of the reference generator, the second output connected via a pulse shaper to the input of a four-diode switch, the other input of which is connected to the output of the linear-ramp voltage generator, and the output of which is connected to one of the valve inputs of the unit pack The three and third inverters are connected to two other inputs through the first and second inverters, respectively, and to the inputs of the second and third control unit valves, respectively, whose second inputs are connected to the outputs of the first and second reference blocks, respectively. SRI. -,

FIG. 1 shows a block diagram of the device in FIG. 2 is a graph 40 of the increase in the angular velocity of the rotor in FIG. 3 - time diagrams of work

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The device contains a reference oscillator 1, one output of which is connected to a pulse generator 2 of 2 pulses, and the other output to a linearly increasing reHepalopy 3 of a voltage whose outputs are connected to a four-diode key 4, the Output of which includes a 50 capacitor 5, connected to the input of the buffer amplifier 6, the output of which through a series-connected fan- and til 7 of the control unit 8, an alternating voltage generator 9 and a 10 55 power amplifier are connected to a piezoceramic converter 11 coupled to a rotor 12 of a vibromotor, yes Angular velocity sensor 13, also coupled to the rotor of the vibrator motor 12 and connected to the input of the amplifier 14, which is connected to the input of the counting trigger 15, the direct code of which is connected to the first inputs of the first 16 and second 17 AND-N circuits and the inputs of two pulse shapers the minimum 18 and maximum 19 durations, all of which are connected to the first drives of the third 20 and fourth 21 I-NOT circuits respectively and through the first 22 and second 23 inverters to the second inputs of the first 16 and second 17 I-NOT circuits respectively, whose outputs are connected toFitting moves zero respectively the first 24 and second

25T-riggers connected by the unit installation inputs to the outputs of the third 20 and fourth 21 I-NOT circuits, the second inputs of which are connected to the inverse output of the counting trigger 15 and to the first input of the linearly-increasing voltage generator 2. Two other valves

26 and 27 of the control unit 8 connected to the outputs of the first 24, respectively.

and second T-flip-flops, which are also connected through the third 28 and fourth

29 inverters with inputs of the valve 7. The second inputs of the valves 26 and 27 are connected to the outputs, respectively, of the first

30 and the second 31 blocks of reference stresses.

 The device works as follows.

Claims (2)

When the device is turned on, the alternating signal of the generator 9 through the power amplifier 10 is supplied to the piezoceramic converter 11, which performs longitudinal oscillations with a resonant frequency. Since the transducer is elastically coupled to the rotor, the vibromotor rotates with a certain angular velocity due to friction forces with the tip of the transducer. The signal from the angular velocity sensor 13 through the amplifier 14 (Fig. 3, a) is fed to the counting output of the trigger 15. The signal from the direct output of the trigger 15 triggers the pulse shapers of duration, forming positive pulses. -With the start of the rotor 12 of the vibromotor, the positive half-cycle of the signal at the output of the trigger 15 (Fig. 3h) is compared in duration to the impulse by an impulse (Fig. 3i), which through the inverter 23 comes from a fortier of 19 pulses of maximum duration in the AND-HE circuit 17, at the output of which a pulse is formed (Fig. 3k), which triggers 25 in one state. Sipnal trigger 25 through inverter 29 closes valve 7 of control unit 8 and opens valve 2 7 through which from reference voltage unit 31 9 alternator control input This voltage is applied to the signal that determines the maximum amplitude of the alternating signal that is fed to the amplifier through the power amplifier. piezoelectric transducer 11. This ensures the maximum torque of the rotor 12 and thus the minimum time of the starting process. As the angular velocity of the rotor 12 increases, the duration of the period T of the signal of the sensor 12 decreases and it becomes shorter than the pulse duration of the former 19. At this moment —fc, (FIG. 2), negative pulses appear at the output of the NANDI circuit 21 25 to the zero state (Fig. 32). The trigger signal 28 closes the valve 27 and, through the inverter 29, opens the valve 7 through which the signal from the buffer amplifier 6 to the control input of the generator 9 receives the signal of the phase control system of the angular velocity of the rotor 12, which operates as follows. The signal from the inverse trigger output 15 by the negative front triggers the generation of 3 line-ramp voltages. The reference generator 1, through the pulse shaper 2, opens a diode switch 4, during the open state of which the memory capacitor 5 is charged. up to the value of the voltage at the output of block 3, proportional to the instantaneous speed of the rotor 12, rear, the pulse edge of the reference generator of generator 1, the voltage at the output of generator 3 is reset to zero. Thus, the signal from the storage capacitor 5, which practically remains constant during the next period, is fed through the buffer amplifier 6 and the gate 7 to the generator 9. During a steady state, the negative pulses from the inverted output of the trigger 15 (Fig. 3 S) are equal to positive the pulse generator 19 (Fig. 3b) in the AND-NE circuit 21, and the signals from its output support the trigger 25 in the zero state. Positive. the pulses from the direct output of the trigger 5 (fig. 3 e) are compared with the negative pulses of the formaker 18 of fig, ze) in the AND-16 circuit and the signals from its output (fig. 3) support the trigger 24 in the zero state. - due to the inertia of the rotor or other disturbances, the angular velocity of the rotor becomes greater than a certain specified value, i.e. it leaves the zone of operation of the phase control system (Fig. 2), then the period of the signal of the sensor 13 becomes shorter than the minimum duration of the driver 18 (the moment of Fig. 2). In this case, the negative impulse from the inverse output of the trigger 15 (Fig. 3 j) is compared in duration with the positive impulse of the former 18 (Fig. 3 m) in the AND-HE circuit 20, at the output of which pulses appear (Fig. 3 n) setting trigger 24 to one state. The trigger signal 24 through inverter 28 shuts down valve 7 and opens valve 26, through which, from reference voltage unit 30, a signal is sent to generator control 9 input providing maximum braking of the rotor 12, the angular velocity of which decreases and enters the zone of action of the phase adjustment system ( moment ij of Fig. 2), the proposed device increases the speed of start-up in the start-stop mode of operation of the vibromotor, and it reduces the likelihood of operation when random speed surges upwards or downwards, and thereby improves the accuracy of the adjustment of the rotor velocity of the vibromotor. The invention The device for powering a piezoelectric vibrator motor comprising a control unit connected in series, an alternating voltage generator, a power amplifier and a piezoceramic converter coupled to the vibrator rotor, an angular velocity sensor, also coupled to the rotor of the vibromotor and connected to the amplifier input, a pulse shaper, the NAND scheme and the chatdiode key, at the output of which a capacitor is connected, which is due to the fact that, in order to increase efficiency, enter s counting trigger pulse shaper two minimum and maximum duration T, three NAND circuits, four inverter, two T-flip-flop, two blocks reference voltage, a reference generator, the generator pyneyno narastayush.ego voltage and buffer amplifier and the block. v1f supra sbrebt three valves, t s-fy-- ...; what the ebtxofl amplifier is connected to; to the input of the counting trigger, the direct output of which is connected to the first inputs of the first and second AND-NOT circuits and the inputs of two pulse shapers of minimum and maximum duration, the outputs of the Third and Secondary Sgrs are connected to the first inputs: and through the first and second inverters - to the second inputs of the corresponding first and second I-NOT circuits, the outputs of which are connected to the inputs of the Zero installation, respectively, of the first and second T-flip-flops connected to the output of the third and fourth I circuits. - NOT, the second inputs of which are connected to the inverse voltage of the counting trigger and the first generator of the linearly increasing voltage, the second B. of the input connected to 7 78 to one output of the reference generator, the second output connected through the pulse generator to the four-diode key input the other input of which is connected to the generator of the linearly increasing voltage, and the output of which is connected to one of the inputs of the valve of the control unit connected to the other two inputs through the third and fourth inverters from the output and the first and second. T-riggers and with the inputs of the second and the third valves of the control unit, respectively, BTOpbje connections are connected to the outputs of the first and respectively. the second. reference voltage blocks. Sources of information taken into account in the examination 1. USSR author's certificate Me 506057, cl. G11 On 15/28, 1974. 2. Authenticator’s certificate fio, application number 24O1439, par. In 1/06, 1977. (prototype).. Phie.1