SU1495977A1 - Ac current regulator - Google Patents

Abstract

FIELD: electrical engineering. The aim of the invention is to reduce the weight and size and improve the shape of the output voltage of an alternating current generating device. through controlled keys 4–11 demodulators to successively connected rotor windings 12 and 13 of the first 14 and second 15 double power machines (MIS), the stator windings 16 and 17 of which are interconnected tion with mutually inverse alternation of the phases and are connected to the regulated power supply 18. The TIR rotor and LRA mounted on the same shaft. The essence of the invention consists in the introduction of a regulated power source 18 and the connection to it of windings 16 and 17, the execution of rotary windings of MDP and ASG And their connection. 1 hp f-ly 1 ill.

Description

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The invention relates to electrical engineering and can be used in power supply systems for producing near-sinusoidal alternating voltage, adjustable in frequency and amplitude.

The aim of the invention is to reduce the weight and size and improve the shape of the output voltage of an alternating current generating device (UGPT).

The drawing shows a circuit diagram of the UGPT.

The device contains an asynchronized synchronous generator 1 (ASG ico stator winding 2, the power outputs of which are connected to the output of the UGPT, and K-phase rotor winding 3 connected by power outputs via controlled demodulator keys 4-11 to serially connected p-phase the rotor windings 12 and 13 of the first 14 and second 15 mnn double power supply (MIS), the g-phase stator windings 16 and 17 of which are connected between each other with reciprocal phase rotation, and the rotors are mounted on the same shaft with the ASG rotor, with this K, t, n, - whole Numbers large units UGPT also contains an adjustable power supply 18, connected by a power output to the series-wired stator windings 16 and 17 of the first 14 and second 15 MDPs.

The LRA is made with a two-phase rotor winding 3, and the second MDP is equipped with a rotor winding 13 having twice the number of turns than the rotor winding 12 of the first MDP, the middle point of each phase is connected to the power terminals of the same phases of the rotor winding 12 of the first MDP 14 connected the star, the ends of the phases of the rotor winding 3 of the AHD are connected to the neutral point of the rotor winding 12 of the first MOS, the beginning of the first phase through one control keys 6–9 of the demodulator - with the beginnings of the phases of the rotor winding 13 of the second MIS, and the beginning of the second phases through other controls The keys 4, 5, 10, and 11 of the demodulator are with the ends of the rotor winding 13 of the second MOS.

The device works as follows.

Variable voltage power supply 18 with variable frequency and output voltage amplitude

I

feeds a sinusoidal alternating current of the required slip frequency (s) to the ACS stator windings 16 and 17 of the MIS, which create magnetic fields with mutually opposite directions of rotation and circular frequency (SU).

When the drive shaft is rotated in the rotor windings of the first and second MIS, EMF is proportional to

e ,. sin |; (w + dw) t + cf; ; e j, sinf (t // - 4w) t +1. where cJ is the circular electrical rotation frequency of the MDP rotors;

, 2,3,4 - phase number of the rotor / jj, winding;

31 - ft - phase angles of the rotor windings.

Since the rotor winding 12 of the first MDP and that half of the rotor winding 13 of the second MDP, which are connected to the beginning of the first phase of the rotor winding 3 of the ACG, are controlled by the control keys 6–9 of the demodulator, their resulting emf

LSG1 e ,, - j- ej. 2 sin (dtx; .t) cos (wt + If.);

since the rotor winding 12 of the first MDP and that half of the rotor winding of the second MDP, which, through controlled keys 4,5,10 and 11 of the demodulator, are connected to the beginning of the second phase of the rotor winding of the ASG, their resulting emf

®Asg | e, i +

 2 cos (dW t) sin (tet + if.).

The controlled keys 6–9 of the alternating current demodulate the first, resulting emf on the low-frequency envelope, which determines the supply of the first phase of the rotor winding 3 of the ACG with a sinusoidal nepei eHHbiM current with the output voltage frequency of the controlled source 18 written. Controlled switches 4,5,10 and 11 of alternating current demodulate the second emf resultant over the low-frequency envelope, which determines the supply of the second phase of the rotor winding of the AHL with the same frequency. These currents flowing through the rotor winding 3 ASG, create a rotating magnetic field with a circular frequency / la /. Consequently, taking into account the rotation of the drive shaft in the phases of the remote winding 2 of the AHG and at the output of the UGPT, an emf is induced

e f sin (6J ± 4tJ) t;

e 8 sin (a) tJw) t-f - | -J;

2iе e-sina f- / sw),

where the sign. + or - before 4a) is given by the demodulator and corresponds to the consonant or opposite direction of the magnetic field relative to the direction of rotation of the drive shaft.

The frequency of the output voltage of the alternating current generating device depends on the frequency of the supply voltage of the rotor winding of the AHL, the value of which is determined by the output frequency df of the regulated power source. At the same time, the slip frequency of the MIS, equal to the slip frequency of the AHL, is insignificant. The regulated power supply 18, directly acting on the MIS excitation current, sets the value of the emf induced in their rotor windings and thereby regulates the excitation current and, therefore, the output voltage of the ACG. The quality of the output voltage of a UGPT depends, in addition to a number of design parameters of an AHL, on the degree of non-sinusoidality of its excitation current curve generated by the demodulator, and is determined by the ratio between the load

 and modulating frequency and number of demodulator output phases: improving the quality of the output voltage of the device is provided by increasing the ratio of the rotational speed of the drive shaft to the frequency of the output voltage of the controlled source

, 18 power supply, as well as the number of phases of the rotor windings MDP.

Serial connection of one hundred: toroidal windings TIR allows mutually

composting them with counter-emf due to the opposite sign of the skolt - seiiHH of these machines, which ensures the minimum value of the installed power of the regulated power source and its extremely high overall dimensions. UGPT has high weight and size indicators, since it is insignificant. largest slip MDP is provided with a small mass and size of the ZDP. A further reduction in the weight and size of the UGTT reaches 5 s by improving the use of

the current of the rotor winding of the first MIS, since each phase of this winding is involved in synthesizing the voltage of all the phases of the rotor winding of the AHL.

0 Improving the shape of the output voltage of the UGPT is achieved due to the high degree of sinusoidality of the output voltage of the demodulator feeding the rotor of the ASG, which has a month5 with a small difference in the amplitudes of the EMF of the rotor windings of the TIR, which is directly proportional to the frequency of rotation of the magnetic fields of these machines relative to the rotors and their differences

0 excitation currents.

In this case, due to the series connection of the stator windings of the MDP, their excitation currents are the same, and the frequencies of rotation of the magnetic fields relative to the rotors are determined by the frequency of the output voltage of the regulated power supply and are small in magnitude.

five

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Claims (2)

1. A device for generating alternating current containing an asynchronized synchronous generator with a stator winding, power terminals g5 which are connected to the output of the alternator current generator and the K-phase rotor winding connected by power leads via controlled demodulator switches to successively connected p-phase rotor windings of the first and second dual source machines, t-phase stator the main windings of which are interconnected with a reciprocal alternation its phases, and the rotors are mounted on the same shaft with the rotor of the asynchronized synchronous generator, with K, t, n being integers, large units, different in that.  14959778 that, in order to reduce the mass and overall power of the dual power supply, and vyvorit, improve the shape of the output of the year of the midpoints of each phase of the connection of the device voltage generated to the power terminals of the same AC, entered the t-phase phase of the rotor winding of the first machine an adjustable power source, a sub-dual power, connected in a power-disconnected power code to the after-arc, and the ends of the phases of the rotor winding connected by the stator asynchronized synchronous The windings of the first and second machines of the dual generator are connected to a neutral JHoro power supply. , IQ the point of the rotor winding first maI 2. The device according to claim 1, about tl and dual-feed tires, the beginning of the first so that, in order to phase through one controlled keys reducing the mass and size of the device-demodulator of the torus are connected with the beginnings | va, asynchronized synchronous phase of the rotor winding of the second machine The generator is made with two-phase ro-dual power, and the beginning of the second ; toroid winding, and the second machine phase through other controlled keys | dual power - with a rotor demodulator torus - with the ends of the rotor ; Coy, which has twice the number of windings of the second machine double feedings, than the rotor winding of the first.