SU1387121A1 - Rectifier drive - Google Patents

Description

(21) 3881429 / 24-07

(22) 04/10/85

(46) 04/07/88. Bul № 13

(71) Cel Bienna Polytechnic Institute Lenin Komsomol

(72) A. N. Korabelnikov, S. G. Voronin, V. M. Sandalov and A. Yu. Murzin

(53) 62-83: 621.313.292 (088.8)

(56) US Patent No. 4162435, cl. 318-138, 1979.

For Japan No. 58-25038, cl. H 02 R 6/00, 1983.

(54) VENTILATION ELECTRIC DRIVE

(57) The invention relates to electrical engineering and can be used in gyroscopic systems and sound-video recording equipment, in radio navigation devices. The aim of the invention is to simplify and increase reliability. This goal is achieved by introducing into the valve electric drive the start circuit (SP), the former 4 short pulses, the circuit OR 6, the inputs connected to the outputs of the joint venture 5 and the driver 4, and the output to the inputs of the control unit 7 and the joint venture 5. In addition, the voltage divider 2 is connected in parallel with the power supply 9, and the second input of the comparator 3 is connected to the neutral of the root winding 1 of the synchronous motor. As a result, an indirect method of forming the EMF signal, under the influence of which the keys are switched, is provided. a driver 8 with fewer comparators, and an increase in drive stability. 3 il.

g

(L

with

00

YU

Q} l / .f

The invention relates to electrical engineering and can be used in most systems and installations with simple cyclograms of operation, preferably in high-speed electric drives, in particular in gyroscopes, sound and video recordings, radio navigation, etc.

The aim of the invention is to simplify and increase reliability.

FIG. 1 is a block diagram of a valve motor drive; in fig. 2 and 3 are timing diagrams that explain the principle of its operation.

The electric drive contains a synchronous motor with excitation from permanent magnets and a three-section open crust winding 1, a resistive voltage divider 2. Middle point divider 2 voltage and neutral winding 1. connected to the corresponding input of the voltage comparator 3, the output of which is connected to the input of the driver 4 pulses. The output of the driver 4 and the output of the start circuit 5 are connected to the inputs of the OR circuit 6, the output of which is connected to the input of the start circuit 5 and to the input of the control unit 7, the output of which is connected to the control input of the reversing inverter 8, the power inputs of the inverter 8 to the power source 9 , and the outputs - to the external terminals of the winding 1 of the motor. A resistive voltage divider 2 is connected in parallel with the power source 9. The control unit 7 is designed as a jog switch.

The valve motor operates as follows.

The step switch 1 operates according to the timing diagram (Fig. 2) and converts the input sequence of short pulses (F) into six sequences of pulses (Y,, Yj, Yj, Z. ,, Zj, Zj). One cycle of these sequences is equal to six periods of the input frequency F, the pulse of each output sequence is equal to two periods of the input, which corresponds to 120 al. degrees, relative to the signals for the emf of rotation. The signals within the groups (Y ,, YZ, Yj) and (Z,, Z, Zj) are also shifted between themselves by 120 e. hail, and these groups are shifted relative to each other by 180 e. hail. In this case, the signals Y ,, YZ, Yj, affecting the keys of the inverter 8, connect the first, second and third sections of the engine to the plus, respectively, and the signal Z. ,, Zj, Z to the minus of the power supply 9.

Thus, at each moment of time one of the sections of the winding 1 is connected to the pole of the power source 9 and the voltage across it is

and and and

where and is the voltage of the power supply 9; U (, is the potential of the middle point of the winding

1 motor relative to the minus of the power source 9. Another section is connected to the minus of the power source 9 and the voltage on it is

and -Uo

At the same time.

 + B 43-;

ten

 -f rJ + L

R

where, 3 3 is the EMF of rotation and currents of the sections connected respectively to the plus and minus of the power source 9;

r, L-active resistance and inductance of sections.

Summing algebraically reduced equations, we determine the potential of the midpoint of the winding 1 of the engine

and ..OVD-, ciCJ -U) ° - g g +

Using well-known relations for the algebraic sum of currents in a node

and the amount of sinusoidal emf +,

where eo is the emf of the section currently disconnected, we get an expression for the potential of the midpoint of the winding 1 of the motor

thirty

and, her + §35

inherent in this method of switching. Since the voltage at the midpoint of the inserted resistive divider 2 is always equal to

and and

 2-

then, according to the wiring diagram of the comparator 3, the differential voltage at its 40 inputs is proportional to the emf (E) of rotation, which is currently disconnected from the winding section 1 of the motor

t t I g 6o

Woo-up

Thus, between positions A and B (Fig. 3), the step switch 7 is in the state YI 1, Z l, 0, with the result that the first section is connected to the plus, the second section is connected to the minus, and a third is turned off.

50 At the input of the comparator 3, an emf (E) of rotation of the disconnected third section acts, which at the end of this switching cycle changes its sign (position B), the comparator 3 switches, and at the output of the former 4, another pulse is generated

55 rotor positions. Under the action of this pulse, the step switch 7 passes to the next new state Y 1, Zj l, and to the input of the comparator

3, the EMF of the next disconnected section is connected, (second), which also changes its sign at the end of this cycle, etc.

The above algorithm is operable, provided that there is no current in the disconnected section when the electromotive voltage of the disconnected section passes through zero (positions A, B, etc.), which is true for most valve motors.

To create an initial rotation, a start-up circuit 5 is used, which can be performed as a one-shot with a predetermined pulse generation period. With a stationary rotor, this one-shot generates the first start pulse, which, about 10

speed stabilization scheme, pulse centering scheme.

The application of the invention makes it possible to reduce the number of voltage comparators employed in the control circuit with a completely identical operation of the electric drive, thereby simplifying the electric drive circuit and increasing its reliability.

Claims (1)

Invention Formula Valve motor drive containing a synchronous motor with excitation from permanent magnets, the root winding of which is connected through an inverter the stroke through the element OR 6 is fed to 15 to the source of direct current, the control input block of the jog switch 7 and, simultaneously, to the one-shot trigger input (input of the start-up circuit 5). As a result, the schagovy switch 7 enters a new state, switching section 1 of the engine, and the start circuit to start the next pulse. If the pulse generation period in start circuit 5 is selected at the engine throttle frequency, the latter starts rotating in synchronous mode. EMF generated 20 The output is connected to the control input of the inverter, a resistive voltage divider, a voltage comparator, one input of which is connected to the middle output of a voltage divider, characterized in that, in order to simplify and improve reliability, a start circuit, a shaper of short pulses, the OR circuit, the inputs of which are connected respectively to the outputs of the start-up circuit and the trimmer, and the drive switches to 25 solid pulses, the output to the inputs of the switching circuit, the start circuit 5 is automatically turned off, lku frequency pulses at its inlet run leaching becomes its own frequency. If necessary, auxiliary units can also be introduced into the device, such as a pulse selection circuit. thirty We have a start and a control unit, the input of the short pulse pulse generator is connected to the output of the comparator, the second input of which is connected to the neutral core of the synchronous motor, and the voltage divider is connected in parallel to the power source. speed stabilization scheme, pulse centering scheme. The application of the invention makes it possible to reduce the number of voltage comparators employed in the control circuit with a completely identical operation of the electric drive, thereby simplifying the electric drive circuit and increasing its reliability. Invention Formula Valve motor drive containing a synchronous motor with excitation from permanent magnets, the root winding of which is connected through an inverter to DC source, control unit 0 The output is connected to the control input of the inverter, a resistive voltage divider, a voltage comparator, one input of which is connected to the middle output of a voltage divider, characterized in that, in order to simplify and improve reliability, a start circuit, a shaper of short pulses, the OR circuit, whose inputs are connected respectively to the outputs of the launch circuit and the driver We have a start and a control unit, the input of the short pulse pulse generator is connected to the output of the comparator, the second input of which is connected to the neutral core of the synchronous motor, and the voltage divider is connected in parallel to the power source. :: -hrnKV Uu L L L I L BUT & Rig.Z