SU517126A1 - Electric drive with asynchronous machine with a phase rotor - Google Patents

Description

(54) ELE1ST C) | 1RMVOD WITH ASYNCHRONOUS MARINA WITH A-YANSH ROTOR in kanalegara7shrova1sh clutch flow. The harmonic function phonograph is connected to an additional unit-inverse transformation of rotor currents (stator) and a voltage inverse-transformation unit, which is directly connected to the resolver, and to a component of the coupling linkage, both directly and through a linking element. The speed sensor is connected to the resolver and, through the mentioned multiplying device, to the unit of commuting links. In this drive, the machine is controlled in parts such as connected to the stator coupling axis. FIG. Figure 1 shows a block diagram of an asynchronous motor with a phase rotor in the coordinate system associated with the stator coupling flow vector; in fig. 2 - the drive circuit is functional. The structural scheme of the syshphone engine (Fig. 1) is obtained from the differential controls written in the orthogonal coordinate system 1, 2, with axis 1 directed along the generalized stator flux linking vector, and axis 2 i leading it by 90 PLN. hail, direction. A motor synchronous engine is a two-dimensional control object, the main channels of which are covered and connected by direct and reverse, own and cross-links. FIG. 1: 3 - stator, g - rotor, m - mutual induction of stator and rotor, I - dissipation, .L inductance, R - active resistance, Zp - number of pairs of poles, K - coefficient, M - moment, W - angular velocity rotation, J - momesh inertia, p - operator. The stator flux linkage channel / i S (axis 1) has input stator voltages. Uj с, and rotors Ujr by tocHl, two parallel branches, containing non-sourcing links with transfer functions KS, Lm, Tg and aperiodic links with transfer functions ξHF, -1. The channel is covered by its own rigid negative feedback with a transfer coefficient. The active current formation channel of the rotor i (axis 2) has stator US and rotor Ujr input voltage given parallel branches containing links with transfer functions Kg and 1. The channel is covered by nonlinear feedback according to the signal representing the rotor rotor speed and stator flux linkage § The rotational speed cot of the generalized stator flux link vector is formed as a function of sipsals I // S- and, S. 2 g with the participation of the dividing link beeshertsionnogo link with a transmission factor KgRs- Two cross (inter-channel) communication dependent upon the product of the currents. rotor .iir, izr on the slip frequency () of the vector i // ig and are formed with the help of links with the transmission coefficient LI-. The electromagnetic moment is the product of the quantities / i s and iz r passed through a link with a transfer coefficient of 3 / 2ZpKs. The integral link 1 / J-p learns the mechanical inertia of the drive. One of the control channels of the asynchronous motor 3 consists of an integral proportional flow controller of the stator 4 and an integral regulator 5 of the magnetization current of the rotor iir and the other channel of the integral proportional speed controller 6, a separator device 7 and the integral regulator 8 of the rotor active current . Regulators in each channel are interconnected according to the principle of subordinate adjustment of parameters. The outputs of the controllers 5 and 8 are connected to the adders of the compensating coupling unit 9, and the same self-coupling and cross-feedback signals are connected to the same adders, compensating for the internal communications of the asynchronous engine 3 and ensuring the isolation of the main control channels. The signals of the compensating links are generated using multiplying devices 10-12 and a proportional-correcting corrective link with a delay 13, as well as using the actual stator 14 flux linkage shaper and harmonic function shaper 15, which in the established mode have the slip frequency and network frequency respectively , blocks of the inverse transformation of three-phase currents 16, two-phase GOKCs 17, phase voltages 18 and a solver 19, interconnected with the sensors of the currents 20, floor p & 21, rotational speed 22 and, moreover, with phase voltage sensors 23 and Hall sensors 24, 25. The outputs of block 9 are connected to the inputs of the direct coordinate conversion unit 26 connected through proportional phase current regulators 27 the inputs of pulse-phase control systems of frequency converter 28 supplying induction motor 3. Block 26 converts the control signals, g and Sj p into phase current settings 3 - Sg, 2b, 2, the latter carry signals proportional to the actual set values phase currents, si proportional perturbed perturbation drives. Block 19 generates a signal proportional to a given stator flux linkage value and dismisses feedback from the stator current regulator 29 connected to the flux regulator input

and in the steady state providing more precise control of the stator power factor.

In order to stabilize the qualitative indicators of the transient control of the moment when the stator flux changes, the input divider of the separating device 7 is connected with the output of the flux linking former 14.

The drive works as follows.

Before starting, the output of the regulator 4 is turned off, and the signal ii g of the set value of the rotor magnetizing current is inputted to the input of the integral controller 5. Then, the output of controller 4 is connected to input 5. To the input of speed controller 6, a linearly increasing signal of a given speed tOpi is received from any software device (for example, a ZI-1 serial intensity controller). At the same time, the output of the regulator 6 generates a signal for setting the electromagnetic moment, which, after passing through the auxiliary device 7, generates a signal for setting the rotor active current ia g - Active and magnetizing current control loops form a typical diagram of the electromagnetic moment corresponding to the prescription of a symmetric optimum, usually used for setting high quality dc drives. The engine accelerates quickly to the required speed.

This electric drive provides separate control of torque in reactive power, so that shock application of the load does not cause a noticeable change in reactive power, and control of reactive power does not cause a noticeable change in the electromagnetic moment and noticeable dynamic speed control errors; provides a speed close to the limit, high overload capacity, depending only on the mechanical strength of the engine and the power of the power sources, ease of adjustment and ease of limiting the main controlled variables.

Claims (1)

An electric drive with an asynchronous motor with a phase rotor, the stator (rotor) of which is connected to the power supply network, contains a thyristor frequency converter with direct connection, connected to the rotor (stator), a unit for direct conversion of rotor currents (stator), a compensating coupling unit , controllers in the channel for regulating the flux linkage, regulators and a separating device in the channel for regulating the speed, sensors of rotor currents (stator), inverse transform unit of rotor currents (stator), block inverse pre voltage generation of the gop network, angular position and velocity sensors rotor shaper harmonic functions . distinguished by the fact that, in order to improve energy indicators in the dynamic remadmah work, it introduced two Hall sensors, installed on the stator (rotor) and connected via the flow linker of the stats (rotor) directly to the harmonic function former, decisive device, dividing device in the velocity control channel, and to the compensating communication unit - both directly and through a multiplier device, while the sensor The position is connected to the inverse current transducer unit of the rotor (stator), the output of which is connected to the flow generator of the stator (rotor), and through. An additional unit for the inverse conversion of rotor (stator) currents and a decisive device with controllers in the flow coupling control channel, a harmonic function driver is connected to an additional 1m inverse unit for the conversion of rotor currents (stator) and with a unit for reverse voltage conversion, which is directly connected to a decisive device directly or via a corrective link, the speed sensor is connected to the decision device and, through the mentioned multiplying device, to the compensating link unit. 3 e ® VO fw +, .., i l s --3 I