RU1774455C - Thyratron motor - Google Patents

Abstract

Using. In electric drives of tape mechanisms of sound recording devices. Essence. In the valve electric drive, each of the introduced integrating circuits 9-11 is connected between the output of one of the comparators 6-8 and the second input of the corresponding comparator 6-8, the first inputs of the comparators are connected respectively to the conclusions of sections 2-4 of the main winding of the electromechanical converter 1. The specified connection of the comparators and integrating circuits form a ring connection, which will allow you to generate the key control signals of the frequency converter 1 in the logical control device 12 in the starting and stable modes work with a smaller discrete. The pulsations of the electromagnetic moment are reduced, the starting torque is increased, the starting time and pulsations of the rotation speed and vibration are reduced. 4 ill. sl C ZM vi 2 b ate SP

Description

Figure 1

The invention relates to electrical engineering and can be used in tape drives of sound recording devices.

Known are electric motors containing an electromechanical converter, a half-wave frequency converter, comparators, the inputs of which are connected to sections of the main windings, and starters made on separate comparators,

A feature of these motors is the lack of a rotor position sensor. Position signals are generated at the outputs of the comparators.

The disadvantage of these engines is the complexity due to the presence of a separate starting circuit and low reliability, because the comparators can be switched both by the action of the emf of rotation and by the action of the signals of the starting circuit. The absence of mutual blocking of these signals can lead to a malfunction of the electric motor when switching to self-switching sections.

The closest technical solution is a valve motor containing an electromechanical converter with a permanent magnet inductor, the first conclusions of the three sections of the root winding of which are combined, a half-wave frequency converter, the outputs of which are connected to the second conclusions of the sections of the root winding, respectively, a logical control unit, the outputs of which are connected respectively, to the inputs of a two-half-frequency frequency converter, three comparators with two inputs each, the outputs of which Connected respectively to the inputs of the logic control unit.

This valve electric motor provides start-up and switching of the sections in position when using the rotation EMF as information.

The disadvantage of this electric motor is the complexity due to the presence of non-linear adders and the need to connect each comparator to two sections of the root winding.

The aim of the present invention is to simplify.

This goal is achieved in that in a valve electric motor containing an electromechanical converter with a permanent magnet inductor, the first conclusions of three sections of the root winding of which are combined, a half-wave frequency converter, the outputs of which are connected to the second terminals

sections of the root winding, respectively, a logical control unit whose outputs are connected respectively to the inputs of a half-wave frequency converter, three comparators with two inputs each, the outputs of which are connected respectively to the inputs of the logical control unit, three integrating circuits are introduced, the first input of the 1st comparator is connected it is connected to the second output of the 1st section of the root winding, and the output is to the input of the (1-1) th integrating circuit, the output of the 1st integrating circuit is connected to the second input of the i-ro comparator, and the first conclusions of the sections the main windings are connected to the common bus of the valve electric motor, and the indicated connection of the comparators and integrating circuits forms a ring connection. The invention is illustrated in the drawings.

Figure 1 shows a functional diagram of a valve motor; Fig. 2 shows an embodiment of comparators; in Fig. 3, 4 - time diagrams of the voltages of 5 voltages at the output of the functional units depending on frequency, (and time t.

The valve electric motor comprises an electromechanical converter 1 with a permanent magnet inductor,

0, the first outputs of three sections 2, 3, 4 of converter 1 are combined, a half-wave frequency converter 5, the outputs of which are connected to the second outputs of sections 2, 3, 4 of the root winding, respectively. The electric motor also contains three comparators 6, 7, 8 with two inputs each. Additionally, the electric motor contains three integrating circuits 9, 10, 11, logic unit 12. The first input of the comparator 6 (7.8) is connected to the second output of the root winding section 2 (3.4), and the output is connected to the input of the integrating circuit 11 (9, 10) and input 13 (14.15) of the logical control unit 12. The outputs of the logical control unit

5 are connected to the corresponding inputs of the frequency converter. The output of the integrating circuit 9 (10, 11) is connected to the second input of the comparator 6 (7.8), and the first outputs of the sections 2, 3, 4 of the root winding are connected to the common bus of the valve motor. The indicated connection of comparators and integrating circuits forms a ring connection.

Logical device 12 may be

5 is made according to the known scheme, as shown in figure 1 or to be combined with a frequency converter 5,

Comparators can be made with direct and inverse inputs, as shown in Fig. 1, or with two inverse inputs.

Valve motor operates as follows.

When the voltage is turned on, the outputs of the comparators 6, 7, 8 are set to arbitrary values of the output signal. Suppose the voltage shown in Fig. 3 at time ti has been established (Fig. 2). Under the influence of these voltages, the input voltage changes on the integrating circuits 9, 10, 11 (Fig. 1). After the voltage polarity (t2) changes at the output of the integrating circuit 11, the comparator 8 switches. This will cause a reload of the integrating circuit 10. At time point (ta), the comparator 7 will switch. Next, a recharging of the integrating circuit 9 will occur and the comparator 6 will switch. This process will occur periodically.

Suppose that when all comparators are turned on, the same voltage is set (Fig. 4, ti). The integrating circuits 9, 10, 11 will begin to recharge in one direction. Suppose that at the output of an integrating circuit 9, the voltage changes sign (t2) first. Comparator 6 will switch. The direction of the overcharge and voltage at the output of the integrating circuit 11 will change. From the moment t2 (Fig. 4), the processes will take place similarly to those shown in Fig. 2 from the moment of Vol. 4 (Fig. 3).

Thus, at the outputs of the comparators, signals of 180 degrees duration will be generated, displaced by 120 degrees relative to each other, regardless of their initial state.

Under the influence of these signals, the keys of the converter 5 will alternately switch, which will lead to the periodic connection of the sections 2, 3, 4 of the root winding to the power source.

A rotary electromagnetic field is generated in an electromechanical transducer. Under this action, the rotor of the motor will begin to rotate. The engine will start in synchronous mode.

During the rotation of the rotor, the EMF of rotation will be induced in sections 2, 3, 4. Acting on the first input of the comparators b, 7, 8 of the EMF of rotation will determine the switching times of the comparators and thereby transfer the motor to switching by the position of the rotor. The order of mutual switching of the comparators will remain the same as shown in

Fig. 3, and will be determined by the moments of transition through the rotation EMF circuit. The moment of transition to position switching is determined by the ratio of the sensitivity of the inputs of the comparators 6, 7, 8 and can occur after the first discrete changes in the spatial position of the field vector. The lead-in angle of the core winding sections can be controlled by time delays in the key control channel of the frequency converter or by changing the sensitivity threshold of the comparators depending on the speed.

Thus, the formation of a control signal in start-up and steady-state modes with a smaller discretion allows using a half-wave frequency converter to reduce the ripple of the electromagnetic moment, which increases the starting moment, reduces the start time, reduces the ripple of the rotation speed and vibration. In addition, the valve motor is simplified by eliminating non-linear adders and connecting threshold elements to more than one section of the electromechanical converter.

Claims (1)

The claims A valve motor containing an electromechanical converter with a permanent magnet inductor, the first conclusions of the three sections of the root winding of which are combined, a half-wave frequency converter, the outputs of which are connected to the second conclusions of the sections of the root winding, respectively, a logical control unit, the outputs of which are connected respectively to the inputs a half-wave frequency converter, three comparators with two inputs each, the outputs of which are connected respectively to the inputs of the logic control unit, characterized in that, to simplify, three integrating circuits are introduced into it, the first input of the 1st comparator is connected to the second output of the 1st section of the root winding, and the output is connected to the input of the (1-1) th integrating circuit, the output of the 1st integrating circuit is connected to the second input of the 1st comparator, and the first conclusions of the root winding sections are connected to the common bus of the valve electric motor, and the indicated connection of the comparators and integrating circuits forms a ring connection. , I L-crj-rpfl Lc-u / | (l l  2