SU1277309A1 - Rectifier electric motor - Google Patents

Abstract

The invention relates to electrical engineering, namely, electric motors (VD-jf ;,. The purpose of the invention is to enhance the functionality by ensuring the formation of a mechanical characteristic close to the characteristic of equal power. The VD contains sections 1-4 of the main winding connected to the power source 5 through the switch transistors 6-9. The control inputs of the transistors 6-9 are connected to the output of the rotor position sensor 11 through the device 10. The motor consumed current sensor 2 is turned on in the motor power supply circuit the equal input of which is connected to the output of the control device 13, and the output to the input of the device 10 of the delay. The delay device can be implemented as a controlled saturation throttle on two cores. The magnitude of the direct current in the winding Drossel bias provides a VD output to a natural mechanical characteristic. (L The feedback signal provides a signal delay time to the control inputs of the transistors proportional to the motor current, and in the result an approximation to the characteristic of equal power. 3 il. IsD soo o

Description

The invention relates to electrical engineering and can be used in electric traction drives that require mechanical characteristics close to those of equal power.

The purpose of the invention is to enhance the functionality by ensuring the formation of a mechanical characteristic close to the characteristic of equal power.

FIG. 1 shows a diagram of a valve electric motor (VD); in fig. 2 - time characteristics; ki, clarifying the principle of the VD; in fig. 3 - mechanical characteristics of VD.

The VD (FIG. 1) contains sections 1-A of the core winding, connected to the power supply 5 through the switch transistors 6-9. The control inputs of the transistors 6-9 through the device 10 delay connected to the output of the sensor

11 position of the rotor (DPR). The engine power circuit contains a sensor.

12 is the consumed current, the control input of which is connected to the output of the control device 13, and the output to the input of the device 10 of the delay.

The delay device 10 does not pass the signal from the output of the DPR 11 to the control inputs of transistors 6–9 to those. time which is determined by the magnitude of the current feedback signal from the output of current sensor 12. Since the current consumed by the motor is proportional to the load moment, the delay time is proportional to the motor load moment. The depth of the current feedback signal is determined by the magnitude of the signal from the device 13.

Let us first consider the work of the VD at a fixed delay time t,, in the absence of feedback for the flow (timing diagrams in Fig. 2).

When rotating the rotor of the VD with a frequency of 4J DPR 11, a two-pole voltage U with a period T 2Tl / uJ is produced. At the moment of voltage jump Uo at the DPR output (fig. 2a, for example, at t 0), the delay time begins (Fig. 2o), during which the delay device does not transmit the DPR signal to the control inputs of transistors 6- 9 switches, and the root winding VD disconnected from the source

nutrition At the end of time t, the delay device resolves the signal from the DPR output, which leads to an abrupt increase in KaiS in the control circuits of those switch transistors that correspond to the position of the HP rotor (Fig. 2). At t) there is a change in the polarity of the voltage U on

output DPR (Fig. 2a). From this moment, the process of forming the delay time starts again, during which the current iS in the control circuits of the switch transistors does not

flows (or very small), and they are again closed (Fig. 2b, at t P (tsZ). Later, as the DB rotor rotates, the described processes are repeated. The time tj ,,

during which the pulse current flows in the control circuits of the switch transistors, it depends on the delay time and the rotation frequency 0. When the rotation frequency increases, for example, due to a decrease in the load torque on the HP shaft, the period T of the DPR signals changes (Fig. 26). At a fixed time t, this leads to a decrease in the relative duration of current pulses iS in the control circuits of transistors which ultimately leads to a decrease in the level of the average stress applied to the root sections

WD windings. For this case, the expression for the mechanical characteristic of the VD in relative units is

) 1 .. 1 + t

where v / c) is relative frequency

rotation of the HP rotor;

- relative time for holding;

o is the rotational speed of an ideal idle; the relative value of the electromagnetic moment of the VD; - electromagnetic moment

VD;

Claims (1)

Hf, - starting moment. FIG. 3, the dashed lines show the mechanical characteristics of the VD at various values of the delay time, G, calculated by expression (1). In the presence of a feedback signal from current sensor 12, the relative delay time is proportional to the motor current, which in turn is proportional to the load torque. Then, substituting the value of TK (C (K is the proportionality factor or, in other words, the depth of feedback) in expression (1), we obtain the expression for the mechanical characteristic of the proposed database V il, .... The value of K is given by the signal value control devices 13. In Fig. 3, the solid lines show the mechanical characteristics of the OBD calculated from the expression (2) at different depth K of the current feedback. With a sufficient value of K, the characteristics approach the characteristic of equal power. For example, in the form of a controlled throttle, we have performed on two cores, as in a known device. At the same time, the choke must have a winding ....-, - bias, the amount of direct current in krtrrry, must provide a VD for natural mechanical The current sensor output is connected to the control winding of the throttle wound oppositely with the bias winding. In this case, as the signal from the current sensor increases (as the load moment increases), the relative delay time increases. Claim electric motor containing a rotor, a stator, the core winding sections of which are connected to a power source through switch transistors, the control inputs of which are through 3. A delay device with a control input is connected to the output of the rotor position sensor, characterized in that functionality by ensuring the formation of a mechanical characteristic close to the characteristic of equal power, a current consumption sensor is inserted into it, the output of which is connected to the control the delay input of the device. ig.2