DE1588106A1 - Electronic device for controlling and regulating the speed of an asynchronous motor with a resistance rotor - Google Patents

Description

Patent attorney

8501 Schwaig / Nümoerg

Paikstio & e2b - Phone 575545

Very.-IJr. 1956/57

uucien.Glaret, 92 Colombes, France

Electronic device for controlling and regulating the speed an asynchronous motor with a resistance rotor

The present invention relates to an electronic üi expensive and ße ^ uliervorriclitun ^ the speed of a Asynchronous motor and in particular an asynchronous motor with "wide rs tandsrot or.

In such motors, their change in torque, which is related to their starting torque, is of particular interest. On the other hand, at a given supply voltage has its Geachwindiökeits-torque characteristic rn some similarity 't ¹ of a series or universal motor, although their speed during idling is lower than the Snchronisiergeschwindigkeit.

Such motors can e.g. single-phase motors with the help of a main phase via a fixed capacitor and with the help of a Feed the auxiliary phase with variable voltage, this auxiliary phase playing the role of a control phase.

The purpose of the present invention is to create a device for feeding the control phase of an asynchronous motor with a variable voltage , which automatically and without delay to changes in the drag torque and the feed

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voltage reacts.

The subject of the present invention is:

An automatic speed control and regulation device an asynchronous motor, of the type with a Y / resistance rotor, driven by a phase with constant voltage and is fed by a phase with variable voltage, one of the two phases having means for phase shifting, with the following characteristics:

Means for stabilized feeding; Means of delivery of a Voltage proportional to the rotational speed of the motor Means for setting a reference voltage, means for determining the distance between these two voltages; Reinforce middle; Means for synchronizing and triggering with delivery of pulses; Control means for feeding at least one of the motor phases in such a way that for each half-wave the determination of a distance between the two voltages is triggered the feeding of at least one of the motor phases entails, wherein the feeding period becomes larger, the larger is the determined voltage gap.

The invention will be explained in more detail with reference to the accompanying drawings. E3 show:

Figure 1: a simplified symbol scheme of an embodiment for a control device according to the invention.

FIG. 2: a detailed circuit diagram of the circuits symbolically represented in FIG.

In FIG. 2, the subgroups according to FIG. 1 have the same reference symbols as obtained in Figure 1. ν

009850/0526 badqbiginaU _ ₃ _

The figures show: M an asynchronous motor with a Widorstantis rotor. This engine has a main phase 1, die- from a network with constant voltage with interposition a capacitor 2 is fed, as well as an auxiliary phase 3. The motor M drives an alternating current tachometer 5, the voltage lic-fert proportional to its speed of rotation, which after rectification and filtering serves to generate the Control the supply of the auxiliary phase.

A is a distance indicator showing that of the AC tachometer compares the voltage supplied after rectification and filtering with the set voltage. This comparison is made by a transistor T 1.

Since this transistor is not sufficient to control the following stages, those transmitted by detector A are transmitted Si.male amplified by the amplifier B, which is a transistor T 2, the power of which the stabilizing device D is supplied.

The device for setting the speed G is formed by a potentiometer »where the speed is through the position of the slide is determined.

The potentiometer can, for example, be a step potentiometer which is pressed from a setting keyboard according to the preselectable speed.

The stabilization device D contains a rectifier Tarückfci the stabilization is ensured by Zener diodes Z and a load resistor E, correct filtering is ensured obtained by a capacitor 4.

009850/052 8. /, ..,, _{; r} .

With E, synchronization and triggering are carried out at each ilald period ensured by the impulses when crossing zero the voltage supplied by D due to a symmetrical (unijunction) transistor T 3, which is supplied by a capacitor 5 is applied, the discharge circuit for example from a pulse transformer 6 of the ferrite type is formed.

In F the force control is realized by a diode bridge, a thyristor 7 is switched on in the direct current branch thereof is whose passage from the secondary winding of the pulse transformer 6 is controlled.

The operation of the device is as follows:

The current flow through the auxiliary phase j is controlled by a thyristor 7 controlled, the device according to the invention allowing the ignition timing of this thyristor as a function of the change the resistance moment Gc, v; el oh.es the engine must overcome, Jin regulate, the motor striving for a speed maintain which is the same as the set speed is.

A savings value is set at C, which corresponds to a certain i / ert of the liotat ion speed of the footer. If the speed is now reduced as a result of the increase in the iViderutaiiüsmomentes, the voltage of the transistor T 1, cU supplied by the WoohseIstromtaohometer decreases; the voltage level detector A becomes conductive, the amplifier b gives the Ötabilisierungs- and Auslö3ungsvorrichtun ₀ D a force .-ii ^ nal from and the secondary winding of the transformer 6 delivers ^{a control pulse to the Kin j} , arig of the thyristor 7.

0.00850 / 0526

On ü-around the supply by the network, the thyristor is bsi transferred to the non-conductive state every half-wave.

In the course of the voltage rise, with a half cycle of the AC voltage network, the opening pulses are sent to the The control electrode of the thyristor is determined by the voltage level sensed at A, i.e. by the magnitude of the speed of the Y / echselstromtachometer. The higher the Motor speed is above the set speed, the more the ignition timing of the thyristor becomes delayed during the half period. One can also determine the time of conductivity of the thyristor, i.e. the time of disconnection, change the auxiliary phase of the motor. With this arrangement, the ignition point can be changed between angle values, which are practically between zero and 180 ° for each half period. Ss is also possible that the thyristor if the speed of the motor is above the set speed, for a half period at all does not open.

The proposed according to the invention control device works in each case like a synchronous commutator that each y / echsel of the supply voltage of the auxiliary phase trimmed and thus making the mean variable, which causes the necessary mean induction in order to achieve stable conditions to back up.

All the elements of the device described are simple and robust and expensive parts are avoided. Remarkable performances are achieved with a classic engine.

-6-

BATH ORIGINAL

009Θ60 / 052Θ

hold, whose AnI to torque is about 8.5 cm k ^ and whose maximum Ürehiaomontandorung in the middle 'Jeschwindi.Jceiten is about 10 cm kg. The speed control fun & tioa runs without difficulty between 130 rev / lin to 1400 Rev / min, regardless of which speed is selected. The stability of the speed is above 300 rev / min very good and meets the frame tone requirements for numerous applications.

The invention is not limited to the exemplary embodiment described limited; for example, the symmetrical transistor T 3 can be replaced by a three- or four-layer diode. Likewise the asynchronous motor can have different speeds (e.g. 2/4 poles). The speed selection is effected by commutators in accordance with known devices.

In the example described, only the auxiliary phase is controlled. One variant is to run the Control the main phase with its capacitor and the auxiliary phase.

The electronic device described can include except one Asynchronous motor also all collector motors e.g. also direct current motors or control universal motors without the need for it another element has to be added.

BADCRiQlNAl.

009850/0526

Claims (1)

Pa ton t anr: check '.; iuilomatisohe elektronischo .jteub-r- und iiü _L oiliervorriühunj "ür der Oeüchv.-indi.-keitsregeliin :. cinos asynchronous motor from: 'yp of the motor with lUdür j tandsrot or, dor of a phase with constant upannun; v and of a phase with variable jj.j..amun.i_, where dia has one, thru two phases iJiitol for phase shift, ^ denotes by Llittul for otabilizing the supply Lütt el the one .jpaiinun ^; deliver which is proportional to the Lfreh ^ esehv / indigkeit du3 motor; means for rolling a reference voltage, iaittül ^ om determining the undo between the two voltage levels; amplifier means, LIittc-1 for synchronization and for triggering pulses; control means for the supply of at least one of the rotor phases, such that for each half-cell the display of an Ab-Vi'öi'jhun ^ between the two ^ en. opannun ^ en dio triggering the ijpeisun ^ 'of v / uni ^ at least one of the motor phases, viobyi the time of the overisun ^ automatiüch all the more The greater the greater the moment of resistance at ir_; end of a certain C-os-jhviindijkuit .is in the control loop. 2. Apparatus according to claim, characterized in that ■ 11. stabllisiertuii Speiaomittui from a rectifier. a bridge and a filter sleeve with / ienerdioden, a capacitance and a Bolastun resistance are formed, ■ j. / oj i'J ehiuij. n'jch Aniipru'jh "i, -Muurch, / ekennzt-iehnet that • dl ·, lai It (Zl zur Lieferuii ■ ';: u iiJ! of the revolution BAD GRjQiJ ^ ,. 009850/0526 kej i Le LIo to i / o proportional voltage of a,. · ..- jh ^ e-lctromtachoincrLr _o ebildct, the one., leijhric-ii,. :: .. "- bridge, a filter line with ^ eneivioden , a capacity and a Beiaetan ^ o ^ idbrstand aufwe.'st. 4. Apparatus according to claim 1, characterized in that 'IaQ uie Ilittel cum JJineteilen a Bezu / sspamiun. formed by a potentiometer. [). 'A device according to claim 1, characterized in that the detecting kittel'zum de, 3 distance between the two voltages are composed of a transistor having its base en with the rotor of the _o *. Potentiometer is connected. 6. The device according to claim "I, characterized in that the / named amplifier means comprise a transistor, controlled by a transistor according to claim 5 . 7. VoiTiuktun. ] i.,. cli claim 1, daJur-Ii .. .ekcniiL-eichnet,: 'λΰ die kittel zur l / nchronisierun / 1: 1: ... .me-iöoim ^ oinon symmetrical (unijunction) transistor, a capacitor and a ϊπρυΐΰtransformer on \: el.-5Kn. ";. Device according to claim 1, in that the center] Mir JUuv.run _o the LJpeicun of at least one of the phases of the IJoiors in the diagonal of a rectifier bridge. A thyristor, the opening of which is deli; c: ianntoii Jmjnilstransformators, controlled \ vii \. _F a '"" 0098 5 0/0 5 26 Blank page