SU1008857A1 - Method of adjusting torque thyratron electric motor - Google Patents

Abstract

METHOD OF ADJUSTING A TORQUE VENTILATED ELECTRIC MOTOR holding a rotor, a stator with a core winding, and a sine-cosine rotor position sensor, the outputs of which are connected through appropriate amplifiers to the sine and cosine phases of the core winding, the body of the body of the body is covered by the body of the body of the object. motor supply and control voltages, turning the sensor stator relative to the motor stator and fixing the angular position of the sensor stator corresponding to the ma maximum of the torque differs schiys. so that, in order to improve the tuning accuracy while simplifying the tuning stand, after applying voltage to the motor, they invert the signal from the sine output of the sensor and feed it to the input of the loudspeakers of the cosine phase of the electric motor on VGOd amplifier: the sinus phase of the motor winding-. V) bodies, the fixation of the angular position of the stator of the sensor, corresponding to the maximum torque, carried out by the angular position, §; corresponding to a complete stop of the electric motor. ,,

Description

The invention relates to electric machines, namely to electric motors of direct current with contactless switching carried out by means of semiconductor devices, i.e. to the valve electric motors, which are electrified, and is intended for adjustment in the process of manufacture and operation of electrical machines operating as executive torque motors of drives for the following systems and stabilization systems for various purposes. . The setting of a torque valve motor (MVD) containing a synchronous machine, amplifiers and a rotor position sensor (DPR) consists in obtaining an angle between the magnetic fluxes or magnetic forces of the cja-itor and rotor C of the switching angle) in the air gap equal to 90 el. hail, which is similar to obtaining the shear angle of the brushes from the geometric neutral of a conventional dc collector motor. The known method of adjusting the MVD is to turn the stator of the DPR of the running engine relative to the stator of the synchronous machine until the maximum of the torque of the tunable engine, measured by a special spring torque meter, is reached. The method is based on the fact that the maximum torque corresponds to a switching angle of 90 el. Degree 1 The disadvantage of this method is the need to necessarily dismantle the torque motor of the control object to install it on any external device-torque meter, which complicates the adjustment and reduces its accuracy, especially when the synchronous motor and DPR are supplied as separate embedded), 1 Closest to the method proposed by the technical entity for adjusting the MIA containing a rotor, a stator with a core winding, a sine-cosine rotor position sensor, the rotors of which are connected via amplification whether the respective sine and cosine phase winding of the armature, comprising the steps of setting up the engine with the object of control in the stand, the feed to the motor power supply and control voltages stator sensor rotation relative to the stator motor and fixing the sensor stator position corresponding to the maximum torque 2}. The disadvantage of this method is the low accuracy of the engine tuning. The torque of the MIA, as is well known, is defined by the expression / YV KR Pp5t0 Md „5tv. (1) dMr is the maximum torque; magnetomotive force mds in the air gap created by the synchronous motor rotor. MDS in the air gap, created by the windings of the stator of the synchronous motor, angle of commutation; the proportionality coefficient determined by the design and winding data of a synchronous machine. At a switching angle of 90, as follows from (1), the torque of the motor reaches a maximum of Mg. However, at switching angles close to 90, the sin 0 function changes slightly, i.e. maximum torque is not clearly expressed, which leads to low angular accuracy of the MVD setting. In addition, a disadvantage of the known method is the complexity of the tuning stand comprising a remote transmission, a voltage source, a preamplifier with an input potentiometer and a load device. Especially great difficulties arise when setting up the MIA embedded in the control object. This complicates the design of the load device and usually requires the use of additional corrective devices. The purpose of the invention is to improve the accuracy of engine tuning while simplifying the tuning bench. The goal is achieved by the method of adjusting the MVD containing the rotor, the stator with the core winding, sine-cosine DPR, the outputs of which are connected through the appropriate amplifiers to the sinus and cosine phases of the core winding, including the installation of a tunable engine with a control object in the 310 stand , supplying the motor with supply and control voltages, turning the stator of the sensor relative to the stator of the synchronous motor and fixing the maximum torque, after applying to the motor voltage Invert the signal from the sine output of the sensor and feed it to the input of the cosine phase amplifier of the synchronous motor winding, and the signal from the cosine output of Dat1 "1ka to the input of the sinus fava amplifier winding of the synchronous machine, while fixing the stator of the sensor corresponding to the maximum torque, on the angular position, corresponding to a complete stop of the engine. FIG. Figure 1 shows the functionality of the scheme of the Ministry of Internal Affairs and the stand with which the method is implemented; in fig. 2 vector diagram of the VAT in the air gap of the synchronous motor in FIG. 3 - a possible type of control signal at the DPR input when its sign changes; ca fig. 4 shows a stand variant in the case of using a sine-cosine rotating transformer (CCT) as AfP; .on FIG. 5 variable phase voltage source. Custom MVD 1 contains a synchronic machine 2, the rotor 3 of which is made of & as a permanent magnet, and the core winding with phases f and 5 is connected via amplifier b and 7 to outputs 8 and 9 of the DPR Wi With a rotor 2, a control object P (and / | and its simulator) is connected. The tuning stand 12 (Fig. 1) consists of an inverter 13 connected to the sinus output 8 of the DPR 10 switch 14 into two positions: right - P (work), left -: N {tuner), and source 15 of the control signal, connected to the power supply circuit 16 of the DPR 10. In case the SCRT (FIG. 4), which contains the excitation winding 17 and the sinus 18 and cosine 19 windings, located, for example, on the DPR 10 rotor, the inverter 13 can be made in the form of a switch that commutes in the H position, the outputs of the sinus winding 18. In this case, as a source of control Igna 15 may &) 1t used potentiometer 20 connected to the AC power supply voltage and. 7 To change the sign (phase) of the control voltage, the source of the control signal 15 is implemented as a square wave generator (Fig. 3). In this case, when using SCRT 10 as a DPR 10 (FIG. 4), the source 15 of the control signal can be made, for example, in a generator. 21 standard rectangular oscillations, at the output of which a modulator 22 is mounted, constructed, for example, on a polarized recon- duced. Le 23 and a mid-point transformer 24, F. The setting method is as follows. The tuned MVD 1 with the control object 11 is installed in the stand 12 (Fig. 1), containing the control signal source 15 and the switch 14 at two positions: P (operation) and H (tuning). The motor is supplied with voltage by connecting the supply voltage to the amplifiers 6 and 7 and the control voltage at the input of the DPR 10 from the source 15 of the control voltage. The DPR 10 stat is deployed relative to the stator of the synchronous machine 2 and the maximum torque of 11 VD 1 is recorded. After applying voltage to the motor, the signals from outputs 8 and 9 of DPR 10 are transformed as follows. The signal is inverted (i.e., its sign or phase is changed) from the sine 8 output of the DM 10. The inverted signal is fed to the input of the amplifier 7 of the cosine winding 5 of the synchronous motor 2 (by switching the switch 14 to the field H) and then the signal from the cosine output 9 DPR TO is fed to the input of the bushing 6 (Sinus; windings 4 of the synchronous motor 2. In addition, the maximum torque of MVD 1 is fixed in the absence of the torque of the rotor 3 of the synchronous machine 2. There is no torque in the MakcHMyMy setting of the torque This motor in normal operation is provided by the operation of converting signals from DPR outputs 10. In the vector diagram (Fig. 2) the angles Chr and the MDS p vectors of FJ and the stator F in the air gap of the synchronous motor are counted from the axis of the axssiss. ct of the torus is equal to ((where and and lU are the voltages on the sine k and the cosine 5 windings of the synchronous motor 2, respectively, Kj, is the proportionality coefficient between the stator synchronous voltage of the stator synchronous and the voltage applied to it, 1 (switch T in FIG. 1 in position P) and, K., and where and, Uj is the voltage across sine 8 and cosine 9 outputs of DPR 10, Ku is the gain of amplifiers 6 and 7. At the same time, the rotor of DPR 10 must be expanded in a properly configured MVD chickpeas relative to the rotor 3 synchronously then the engine 2 to 90 el. deg; Ie / АР where F is the angular position of the rotor of the DPR 10. The voltages at the sine 8 and the cosine 9 outputs of the DPR 10 are related to the control voltage U input 16 D 10 by the C () dependence (where KA is the transformation ratio (transmission) of DPR 10. Then, taking into account (s) and C), expression 2 takes the form (p Eo °; ft (y90 "), from where the stator angle of the stator is iGin (/ p490"% Ch7G "SC, COS () 2 - hr + zo ;; and the switching angle fe 4 -ifpz9o ° With the MVD 1 nartroyka (switch I in Fig. 2 in position H) U -K / Vi U2-K, Uj ,, then from ( 2) find n.). Jco. (7. From where the VAT angle of the stator is cos (V90 °) ,,, "irct" {(). (II Since ctg (fp + 90 °) is tgVp, then from (6 ) follows v, "rcict tc ti / p - "fp: Therefore, for a properly tuned MVD, in the tuning mode, the switching angle is 9 ° and the torque is equal to zero in accordance with the expression (1). Thus, if in the tuning mode, by turning the stator of the DPR 10, there is no rotation of the engine, for this position of the stator DPR 10 in the mode of operation (switch AND return to the position P) torque. MVD 1 will automatically reach the maximum value, since the angle of com, mutation 0 will become equal to 90 el. hail. Similar results can be obtained by replacing the invert operation of the signal from the sine output 8 of the DPR 10 by the equivalent operation of inverting the signal from the cosine output 9 of the DPR 10. Improved tuning accuracy occurs due to a decrease in the method of tuning error. The absolute measurement error of torque at a constant voltage, as follows from formula (1), is equal. According to a known method, the switching angle is close to 90, i.e. where otg is the angle error setting. Therefore, for a known method, where A is the measurement error of the value of the corresponding function. Assuming oto is small and expanding, putting the coscL function in a row, get oi from where Cosod, -, 4fcosct th- and / JM- / and “vm 2 710 According to the proposed method and torque measurement in the configuration mode commutation angle close to zero, i.e. , the angle error of the setting in the proposed method. Consequently, the measurement error of myIta with the proposed setting method, taking into account a small value, is equal to) It is considered that the measurement error of the torque is the same in both methods, i.e. tLM |, is obtained from 8 and 9 For example, if we take the measurement error of a moment equal to 10% of the maximum value of the moment. developed by the engine, i.e., 1, then the angular error of the tuner according to the proposed method is 0 (10%), and according to the method known about the 2nd UOT2 0, (45%). Studies have found that with a constant sign (phase), upward voltage at the DPR input, an increase in tuning accuracy is achieved with a small moment of friction in the supports of the MVL and the control object. With a large friction training, it is advisable to change the sign (phase) of the control voltage at the DPR input with a sufficiently high frequency. This is due to the fact that the tuning error, as follows from the ECC), is proportional to the measurement error of the DM moment, which is actually determined by the value of the dry friction moment in the supports 1 and the control object 11. When changing the sign (phase) control / | The voltage of the MVD changes its sign, which causes the rotor 3 of the synchronous motor to vibrate. This leads to a reduction in the friction of the supports and, therefore, to a decrease in the tuning error. To achieve 7.88 maximum effect, as shown by experiments, the MVD should work in the mode of the torque sensor, which can be achieved if the engine acceleration occurs during not more than one constant MVD time (taking into account the control object) TC. Thus, the recommended period of change of the control signal T 2T, a comparative experimental adjustment of the MIA containing a sixteen-pole two-phase synchronous motor of the DMV-2 type, with permanent magnets on the rotor (starting torque 2.5, supply voltage 27), DPR was carried out the base of the contactless SCWT type 2.5 BWT and two transistor amplifiers. The MIA was connected to a control object simulator (with an inertia ratio of 5.5, exceeding the inertia moment of the rotor of the engine) containing a powder coupling, the inclusion of which introduced an additional dry friction torque of 1 Nm. When tuned to the prototype, the load device. In the form of a pulley with a load created a constant static moment of 0.56. For the implementation of the proposed method, an adjusting stand was used, the KTOR Joro scheme is depicted on (| k. K and 5. The accuracy of the adjustment was evaluated for four settings by the rotational speed asymmetry of the MVD after adjustment at its right and left rotation. The test results are tabulated It can be seen from the table that the proposed MVD setting method reduces the tuning error by 2.9 times with a small moment of dry friction and 3.5 by 3.8 times with a large moment of dry friction and with a change in the control signal. equipment (for example, the stand in Fig. contains only two switches and a potentiometer), and the setting itself is facilitated and accelerated as a result of the absence of operations to tune the tracking system, which is necessary with a known method.

Famous

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Claims (1)

METHOD FOR ADJUSTING A MOMENT FAN VENT ELECTRIC MOTOR, with / 'holding a rotor, a stator with armature winding and a sine-cosine rotor position sensor, the outputs of which are connected through the appropriate wire to the sine and cosine phases of the armature winding, including the setting operation _; motor with control object J to the stand / supply to the motor of the pitakmtsogo and control voltages, the rotation of the stator of the sensor relative to the stator of the motor and fixing the angular position of the stator of the sensor corresponding to the maximum torque, characterized in that, in order to increase tuning accuracy while simplifying the tuning stand, after applying to the voltage motor inverts the signal from the sine output of the sensor and feeds it to the input of the sid-? of the cosine phase of the electric motor, and the signal from the cosine output of the sensor is fed to the amplifier *: the sine phase of the electric motor winding. the body, and fixing the angular position of the stator of the sensor, corresponding to the maximum torque, is carried out by the angular position 'corresponding to the complete stop of the electric motor. ,. 1008857. 1 1008857 2