SU1684870A1 - Rectifier generator - Google Patents

Abstract

The invention relates to non-contact electric machines, in particular, to contactless DC current generators with a low level of ripple voltage. The purpose of the invention is to expand the functionality and reduce the weight and size of the electromechanical part. The valve generator consists of an electromechanical converter containing a rotor 1 and a stator of a valve rectifier on valves 3-8, and a smoothing device, the latter made in the form of a second rectifier on valves 10-15, a rotor position sensor (DPR), the source 16 constant voltage adder and signal multiplier. DPR is configured to form smoothly varying signals at the outputs when the rotor is rotated. The inputs of the second rectifier are associated with the corresponding DPR outputs. The output of this rectifier is connected to the first input of the adder. The second input of the adder is connected to a constant electric signal source. The fifth input of the signal multiplier is connected to the output of the adder, and the second is connected to the main output of the generator. The generator is designed to use 1 as a rotational speed sensor of precise tracking systems. 3 hp ff, 2 ill. (L

Description

The invention relates to contactless electric machines, in particular to contactless DC generators with low ripple voltage, for example, a tachogenerator of tracking systems.

The purpose of the invention is to expand the functionality and reduce the weight and size of the electromechanical part.

FIG. 1 shows the electrical circuit of the valve generator; in fig. 2 c; voltage cells in this generator

The generator consists of an electromechanical converter containing a rotor 1 with 2p poles and a stator 2 with a sectional core winding, a main rectifier on valves 3-8, a rotor position sensor 9 (DPR), a second rectifier with valves 10 -15, the source 16 of a constant n, e-spaining, an adder, performed on resistors 17-19 and a multiplier of 20 signals.

About 100 to 00

 about

A constant voltage level predetermines the ripple level of the output voltage of the generator. DPR is configured to form smoothly varying outputs at the outputs as the rotor rotates. It can be made in the form of a Hall generator on the stator and a ring multipolar magnet on the rotor. The number of its poles is 2p, and the number of channels (outputs N) is equal to or not equal to the number S of sections of the core winding. If the number of channels is not equal to the number S, the generator should be equipped with a DPR signal converter, made for example, in the form of additional adders, the number of which is one less than the number of winding sections. If, for example, there are two DPR, and there are two additional adders, two sections. The direct and inverse inputs of the first additional adder must be connected respectively to the second and first DPR output. The first and second inverse inputs of the second adder - with the first and second outputs of the DPR. The first and second additional adders must be configured to shift the output signals relative to the signal from the first DPR output, respectively, by 120-240 ° C while the rotor rotates (it is assumed that the DPR signals are offset from each other by 90 °). Adders (including the main one) can be made on passive elements - resistors, or on active elements - operational amplifiers. DPR can be performed with 2p is poles and the only output that is connected to the only input of the second rectifier. The inputs of the second rectifier are connected to the corresponding DPR outputs if the number of outputs is equal to the number of winding sections. Otherwise, one of the inputs of the second rectifier is connected to one of the DPR outputs, and the others - to the outputs of the DPR signal converter. The output of the second rectifier is connected to the first input of the adder. The second input of the adder is connected to a constant electric signal source. The first input of the signal multiplier is connected to the output of the adder, and the second is connected to the output of the main rectifier.

The generator works as follows.

When the rotor is rotated by the drive motor in the sections of the stator windings 2, EMFs at the outputs of the DPR 9 generate smoothly varying signals. The voltage on the sections of the generator winding and the signals of the DPR are converted into pulsating voltages respectively and

second rectifier. These voltages on the repetition period F vary as in FIG. 2a (p is the angle of rotation of the rotor relative to the stator).

The adder algebraically adds the voltage at the output of the second rectifier and the source 16 of the constant voltage. The voltage at the output of the adder pulses at the repetition period (Fig. 26). The signal multiplier 20 multiplies the pulsating voltages at the output of the main rectifier and adder. The output voltage of the multiplier is the output voltage of the valve generator and changes as the rotor rotates during the repetition period (Fig. 2c).

Let the voltages on the core winding sections and the DPR signals change when the rotor rotates according to the sinusoidal law N S. Then the voltage U1 at the output of the main rectifier is proportional to the expression

Ui cos

(Ns ")

voltage 1/2 at the output of the adder is proportional to the expression

U2 1 + a -a -cos | - (p. (About Ug Ri

where a

E RIB -Ufl

Ug is the amplitude of DPR signals;

 RIB resistance of resistors 17 and 18 (resistor 19 is missing).

The output voltage of the generator U is proportional to the product

(p) Ui -U2. (five)

The ripple e of the output voltage of the generator U is defined as

 U

-I-u

min

 100 % . (four)

Analyzing the function e with regard to (1) - (3) by the methods of mathematical analysis, one can obtain the following results.

The minimum of this function corresponds to the conditions

Cum uo u f | one ;

but

one

cos tp / 2

and Q + a) 2 1 + cos p / 2) 25

imax - 4. a 4 cos p / 2

The minimum pulsations with can be expressed in the following function of the intercommutton of the ny Fy interval

(one

Cos

W2) 2

+ 6 cos f / 2 + cos f / 2

If, for example, the number of winding sections is three, and the rectifier is of the bridge type, then the angle Y is equal to l / 3, and the ripple k is equal to 0.26%.

If DPR is made with 2p "s poles, a single output and the possibility of forming a sinusoidal signal, then

l:

1/2 s - sin m P

If, in addition, the expression (1) is observed, then the minimum of the pulsation with. equal to approximately 0.49%, while

and (0) and (y), C 7.464.

This result was obtained as a result of a joint analysis of expressions (1), (3), (4) and (5).

The generator can be used as a rotational speed sensor of precise servo systems.

Claims (4)

Invention Formula .one. A valve generator containing an electromechanical converter with 2p poles, a stator with an s-section root winding connected to a rectifier, the output of which is connected to a constant circuit five YU 15 20 . 25 thirty from 40 ds voltage through a smoothing device that includes a variable voltage source, whose frequency is rigidly connected to the generator frequency, the output of the alternating voltage source is connected through a second rectifier and adder with a constant voltage circuit, characterized in that expanding the scope of application and reducing the mass of the electromechanical part, it is equipped with a constant voltage source and multiplier, the alternating voltage source is made in the form of a rotor position sensor, the output of the second rectifier Inonii to the first input of the adder, the second input of the adder is connected to a source of DC voltage output of the adder is connected to a first input of multiplier signal, a second input of multiplier connected to the output main rectifier. 2. The generator according to claim 1, characterized in that the rotor position sensor is made with 2p poles and a number of outputs equal to the number of winding sections, the second rectifier is made according to the main rectifier circuit. 3. The generator according to claim 1, characterized in that the rotor position sensor is made with 2p poles and a number of outputs not equal to the number of winding sections, the second rectifier is made according to the main rectifier circuit, the generator is equipped with additional totalizers, the number of which is less unit of the number of winding sections, two inputs of each additional adder are connected to two sensor outputs, one of the inputs of the second rectifier is connected to one of the sensor outputs, the remaining inputs of this rectifier are connected to the outputs of additional adders. 4. The generator according to Claims, 1, O. and L and Y and Y with the fact that the rotor position sensor is made with poles and one output. ABOUT but 0v v h