SU682972A1 - Supply system for a vibratory step motor - Google Patents

Description

Connected to the control input of the valve 2. The control unit 11 is connected to the circuit IS-HE 8 and through the inverter 12 - to the circuit IS-HE 9.

The device works as follows.

The signal from generator 1, via valve 2, is connected to piezoceramic converter 3, which, due to the inverse piezoelectric effect, makes longitudinal oscillations. The piezoceramic transducer 3 communicates with the rotor 4 of the vibromotor, which starts the rotation. In the stepping mode of the vibromotor, the frequency of the steps is limited by the transients in the electrical circuits when the power is turned on and off by the piezoceramic transducer 3. The piezoceramic transducer constitutes a resonant circuit, the natural frequency of which is expressed by the formula

where L is the equivalent inductance of the converter;

C is equivalent to the capacity of the converter.

The quality factor of the Q contour will be the expression:

p g s

where Gy- is the active e-resistance of the source

nutrition;

r, - is the equivalent loop resistance at the resonant frequency. If the supply voltage is discontinuously disconnected, the quality factor of the circuit, ei, e increases. The voltage in the parallel resonant circuit is expressed as follows:

e (t) L sinoo (l - 1

- attenuation coefficient.

where a

after turning off the power, the voltage of the circuit will fall at a given time of t Ijd. The more good the circuit, the smaller the damping and the slower it decreases when it is turned off and the voltage across the converter increases when turned on.

When disconnecting nityush, its voltage is: at the moment when A is O, the transition process will be absent, since at resonance the equivalent resistance of the circuit is active and there is no phase mismatch between the voltage and the current.

The signal from the alternating voltage generator 1 (see Fig. 2, curve 15) through the pulse shaper 5, in which the square wave is formed (see Fig. 2, curve 16) through the delay circuit 6 (see Fig. 2, curve 17) and the inverter 7 is supplied in parallel to the two IS-NOT 8 and 9. When starting the rotation of the rotor 4, the control unit 11 generates a positive impulse (I eat. FIG. 2, curve 13) opening the AND-HE circuit and through the inverter 12 (see Fig. 2, curve 14) the AND-NE circuit 9. The delay circuit 6 delays the signal by a time TO, significantly less than the period T of the generator 1 signal. When the and units of signals at all inputs of circuit 8, i.e., when the generator signal 1 passes through the zero, the output of circuit 8 produces short pulses (see Fig. 2, curve 18) with a duration equal to Te, setting trigger 10 to a single position. The trigger signal 10 opens the valve 2 and the output of the generator 1 is connected to the piezoceramic converter 3 at the moment when the voltage amplitude at its output is approximately zero. This eliminates the possibility of a jump-like occurrence of the power signal of the converter 3, thereby reducing the transition time of the rotation of the rotor 4.

When the converter 3 power is turned off, the control unit 11 generates a negative pulse, which closes the circuit 8 and, through the inverter, opens the circuit 9. When units of signals fall across all inputs of circuit 9, short impulses are formed at its output (see Fig. 2, curve 19), which trigger 10 to zero position. The trigger signal 10 closes the valve 2 at that moment when the signal voltage at the output of the generator 1 is approximately equal to zero. This reduces the transient deactivation of the feed pitch of the rotor and the vibromotor.

Claims (2)

1. US patent number 3474264, CL. 310-8.1, publ. 1967. 2. US patent number 3532911, cl. 310-8.1, 1968. )9 four u Fig