SU264807A1 - DEVICE FOR MODELING ASYNCHRONOMOTELATOR - Google Patents

Description

The proposed device relates to computer aids and can be used in modeling systems with self-contained synchronous motors.

Basically auth. St. No. 219921 describes a device for simulating an asynchronous engine comprising adders, a coefficient block, a function block with a constraint characteristic, a multiplication block, and a division block.

The device described in the basic copyright certificate does not take into account the dependence of the mechanical characteristic of the induction motor on the frequency and voltage of the power supply.

To achieve this, the proposed device additionally contains an inverter, an adder and a multiplier unit, the inverter input is connected to the main adder input and serves as the INPUT information on the frequency variation of the power supply network, the second input of the additional adder serves as the input information on the power supply voltage variation, its third input is connected to the positive pole of the DC voltage source, the second input of the additional multiplication unit is connected to the output of the division unit, and the output serves as an output device.

The drawing presents the scheme of the proposed device.

The device contains the main adders / and 2, the block of coefficients 3, functional

a block 4 with a limitation characteristic, a multiplier 5, a division block 6, an inverter 7, an adder 8 and a multiplier 9.

The following notation is used in the scheme: and is a voltage proportional to the speed of the asynchronous motor; U. - voltage normalized to the moment developed by the engine; bd is the voltage proportional to the change in the frequency of the mains supply; g - voltage proportional to voltage variation of the power supply network.

The proposed device provides accurate reproduction of the mechanical characteristic as an equation.

(1 + 2d, - 2d.),

R-

+ where (1 is the moment of the asynchronous motor in relative units; Yes and D are, respectively, the relative change in the operation and voltage of the mains at the current absolute cleavage, 25 r

No less than 10–12% error) reproduction of a part of the Unstable branch as an equation

(1 + 2d, -2d.),

V + 0 "

to

moreover, the current value of the absolute slip p in both equations depends on changes in the frequency of Yes as follows:

p 1 + Yes - JL,

Pen-sync speed of rotation of the shaft of the induction motor, corresponding to the nominal frequency of the power supply; n - the true speed of rotation of the shaft.

Subject matter

Device for simulating an induction motor according to the ed. St. No. 219921, characterized in that, in order to increase the accuracy of the model by taking into account the dependence of the mechanical characteristics of the induction motor on frequency variation and supply voltage, it additionally contains an inverter connected in series, an adder and a multiplier, and the inverter input is connected to the input of the main adder and serves as the input of information about the change in the network frequency, the power supply, the second input of the full-voltage adder serves as the input of information about the change in the supply voltage, its third input is connected to olozhitelnomu pole of the voltage source DC, the second input dopolyitelnogo multiplying unit connected to the outlet dividing unit and the output serves as the output device.

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