JPS5950799A - Controller for motor generator - Google Patents

Abstract

PURPOSE:To eliminate the interruption of a power source supply to a load side even if a power source is interrupted due to the passage of a section by decreasing the output voltage of a generator when a power source for driving a motor is temporarily interrupted. CONSTITUTION:When a voltage detector 14 is operated, an auxiliary coil contactor 17 and a main circuit contactor 18 are excited, and a single phase induction motor 11M of a motor generator 11 starts. When the output frequency of a generator 11G becomes the prescribed frequency or higher, a frequency relay 16 is excited, the contactor 17 is demagnetized, and a load contactor 24 is excited. An automatic voltage regulator 26 controls the exciting current by the reference voltage 29 by a Zener diode 46 when a motor circuit power source 13 is energized and in response to the deviation between the reference voltage 29' lower than the reference voltage 29 and the output voltage of the generator when the motor circuit power source 13 is not energized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a control device for a motor generator for a vehicle, for example.

[Technical background of the invention]

An example of a commonly used control device for this type of motor generator is one constructed as shown in FIG.

To start the motor generator 11 shown in FIG. 1, the control circuit power supply 12 and the motor circuit power supply 13 may be turned on. On the condition that the voltage of the motor circuit power supply 13 is above a certain value, the voltage detector 14 is excited and the contact 14m is closed. By closing this contact 14&, time-limiting relay contact 15b
Since the contacts 16b of the frequency detection output relay 16, which will be described later, both remain closed, the auxiliary winding contactor 17 is excited, and the contacts 17al+17a2 are closed. The main circuit contactor 18 is energized by the closing of this contact 17*1, 17a2, and this contact 18m1.18m2.18a
3 is closed. This contact 18 a 1 e 18 a
By the closing of 2 + 18a and 9, the main winding 1'1Mm and the auxiliary winding 11Ma of the single-phase induction motor 11M of the motor generator 1 are excited, and the induction motor 11M starts to start.◎The auxiliary winding A starting capacitor 19 and a discharging resistor 20 are connected to the line 11 Ma. A starting resistor 21 is electrically connected.

Also, at the same time as the induction motor 11M is started, the pre-excitation circuit 2
2, the field winding 11Gf of the four power generators 11G is pre-excited, so the output voltage of the generator 11G rises. On the other hand, the output frequency (rotation speed) of power generation #11G is detected by the 1-frequency detector 23, and when the output frequency reaches a certain frequency, the frequency detection output relay 16 is energized, and this contact 1
6al and 16a2 are closed, and the contact 16 is opened.

When the contact 16b is opened, the auxiliary winding contactor 17 is demagnetized, the contacts 17al and 17h2 are opened, and the motor generator 1 is operated without the auxiliary winding 11 Ma. Also, due to the closing of contacts 16 & 1, the load contactor 2
4 is excited, the contacts 24al and 24h2 are closed, and the output voltage of the generator 11G is fully supplied to the load circuit 25.

Pre-excitation circuit 22 for output voltage control of generator 11G
An automatic voltage regulator (hereinafter referred to as AVR) 26 is connected between the generator and the excitation winding of the 1.7 G generator. This AV
R26 is constructed as shown in FIG. 2, and a Zener diode 28 is connected between the AVR control power source 27, thereby obtaining a reference voltage 29. Also, generator output box 1
Transformer for voltage 3θ? 1, a rectifier 32 and a resistor 33 are sequentially supplied to obtain a detected voltage 34. The reference voltage 29 and detection voltage 34 thus obtained are input to a comparator 35, and the output thereof is input to the base of a transistor 36 whose emitter and collector are connected between the control power supply bus 27. A capacitor 37 is connected between the collector of the transistor 36 and one of the AVR control vehicle sources 27, and the connection point between the capacitor 37 and the transistor 36, the AVR
A tri-element 38 is connected between the control power supply 27, and this)1
A thyristor 39 is connected between the source of the seven elements 38 and one of the AVR control power supplies 27. Note that 40 is a generator field.

In such a configuration, the firing angle of the thyristor 39 is determined by the charging current of the capacitor 37 and the transistor 96.
By changing the timing, the timing of the oscillation of the element 38 is changed to determine the firing angle. Tsumashi reference voltage 2
Control is performed so that when the resistor 33 becomes larger, the charging current of the capacitor 37 is reduced to delay the ignition, and when the resistor 33 becomes smaller, the ignition is accelerated.

[Problems with background technology]

The starting of the electric motor 11M is as shown in the torque curve of Fig. 3.
It can be seen that the motor torque curve 57 with only the main winding 11 mm is entered via the switching point 53 from 2 to the motor torque curve 57 with only the main winding 11 mm, and enters steady state operation with the load torque always exceeding the load torque 54. Note that the 49 scale indicates a point of 1, the 5θ scale indicates a 00 point, and the 5 indicates a torque. As mentioned above, the auxiliary winding 11Ma is turned on only when the rotational speed is below a certain value, so if the motor power supply 13 is temporarily interrupted when the vehicle passes through a section, etc., the curve 57 in FIG. As the motor torque decreases, it becomes lower than the load torque 34 at a certain point, and even if the motor power supply 13 is restored at this time, the motor 11M1d stalls. therefore,
When the frequency detection output relay 16 is demagnetized and the main circuit contactor 18 and the load contactor 24 are demagnetized, the voltage of the circuit 25 is also temporarily interrupted. In FIG. 3, 55 indicates the motor torque when the switch is switched off, and 56 indicates the load torque when the switch is switched.

FIG. 4 shows how the generator output voltage 7 and output frequency 8 decrease when the motor power supply 13 is temporarily interrupted. As is clear from this figure, in the conventional device, since the generator output voltage 7 is controlled by the AVR 26, it tries to keep it constant. On the other hand, the load current of the generator JIG is approximately proportional to the voltage in the vehicle load case 6-, so as long as the voltage does not drop, p1
The load is constant. In addition, in FIG. 4, 7a indicates a voltage value that does not affect the load side. therefore,
The rotational speed was decreasing faster. As mentioned above, this has the disadvantage that the frequency detection output device 16 is quickly demagnetized and the power supply of the load circuit 25 is also temporarily interrupted, so that the indoor lighting on the load side is temporarily interrupted. ] An object of the present invention is to provide a control device for a motor generator that can continue to supply Tt power to the load side even if the motor power supply is interrupted.

[Summary of the invention]

In order to achieve the above object, the present invention provides a first reference voltage obtained from a motor circuit power source and a control power source as a reference voltage of an automatic voltage regulator, which is lower than the first reference voltage, and which does not affect the load. A second reference voltage having a value of zero is applied when the motor circuit power supply is interrupted.

[Embodiments of the invention]

The present invention will be explained below with reference to the drawings.

FIG. 5 shows only the main parts of the embodiment of the present invention, which differs from the conventional device shown in FIG. 2 in the following points. The motor circuit power supply 13 is boosted by a transformer 42, the output of which is input to a rectifier 43, and the output of the rectifier 43 is connected to a resistor 44 in series with the output side of the rectifier 43.
, are applied in parallel to Zener diodes 46 connected in parallel via capacitors 45, respectively, thereby obtaining the reference voltage shown in FIG. Further, a resistor 48 is connected in parallel to the output side of the Zener diode 46, and the Zener diode 4 is connected between the AVR control power supply 27 and the resistor 48.
7 is connected to obtain a reference voltage 29' set to a smaller value than the reference voltage 29, and this reference voltage 29' is input to the comparator 35.

The reason for this configuration is that the reference voltage of the comparator 35 is set to the sixth
As shown in the figure, when the motor circuit power supply 13 is pressurized, the reference voltage becomes 29, and when the motor circuit power supply 13 is not pressurized, the AVR control current temperature 27 causes the reference voltage to become 29.
It becomes 9'.

Note that this reference voltage 29' must be set to a voltage value that does not affect the lighting of the load.

The operation of the control device configured as described above will be explained below. In a steady state, when the stain mower 11M is operated by the tab stain motive circuit power supply 13, it is controlled by the reference voltage 29. In this state, if power supply 111 circuit power supply 13 is interrupted due to passing through the section, etc., then frost 'IiQ
, + machine circuit power supply 13 disappears, and the reference voltage becomes 29'. Therefore, the output voltage of the generator JIG is determined by the reference voltage W and can be expressed as t=w.

Considering the amount of work W and the company load P, by lowering the voltage, the total load current i < L, P = VIc Since the value remains constant, the reduction time becomes shorter.

This is illustrated in Figure 7. When the generator circuit power supply 13 is temporarily interrupted, the attenuation of the output frequency 8 can be delayed by lowering the generator output voltage 7 to some extent.

Therefore, even if there is an interruption due to passing through a section, etc., operation can be continued without opening the load side. Note that in FIG. 7, 78 indicates a voltage value that does not affect the load side.

〔Effect of the invention〕

According to the present invention described above, it is possible to provide a control device for a motor-generator which eliminates phenomena such as lights going out because power is supplied to the load side even if the power is interrupted due to passing through a section or the like.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an example of a commonly used motor generator control device, Fig. 2 is a diagram showing a conventional example of the output voltage control circuit of the generator shown in Fig. FIG. 4 is a diagram for explaining the operation of the circuit in FIG. 2, and FIG. 5 is a diagram showing the main parts of an embodiment of the motor generator control device according to the present invention. Circuit diagram shown, No. 6
The figure is a diagram for explaining the reference voltage of the comparator in Figure 5,
FIG. 7 is a diagram showing a torque curve of the electric motor shown in FIG. 7... Generator output voltage, 8... Output frequency, 7a.
...Voltage that does not affect the load side, 11... Generator 11G
A motor generator consisting of an induction motor 11M, 12...
Control circuit power supply, 13... Motor circuit power supply, 14...
Voltage detector, 15b... Time-limited relay device point, 16...
Frequency detection relay equipment, 17... Auxiliary winding contactor, 1
8... Main circuit contactor, 19... Starting capacitor, 20... Discharging resistor, 21... Starting resistor, 22
... Pre-excitation circuit, 23... Frequency detector, 24.
... Load contactor, 25... Load circuit, 26... Automatic voltage regulator, 27... AVR control power supply, 28... Zener diode, 29... Reference voltage, 30... Generator Output voltage, 3... transformer, 32... rectifier,
33...Resistor, 34...Detection voltage, 35...Comparator, 36...Transistor, 37...Capacitor, 38...Trigger collector, 39...Thyristor, 40
... Generator field, 42 ... Transformer, 43 ... Rectifier, 44 ... Resistor, 45 ... Capacitor, 46.
47...Zener diode, 48...Resistor, 4
9... Point with slippage of 1, 50... Point with slippage of O,
51...torque, 52...air, motive torque curve, 5
3...Switching point, 54...Load torque, 55...Motor torque at the time of switching, 56...Load torque at the time of switching, 57...Motor torque curve of only the main winding. Applicant's agent Patent attorney Suzue Takehiko No. 1 Insu 2 Prisoner 7 5 3663839 28-37,40 3゛34 Item 0 Third cause 950 Figure 4 Tokiga (t) Sec→

Claims (1)

[Claims] The generator output voltage of a motor-generator in which a generator is directly connected to an electric motor that has a main winding and an auxiliary difference wire and rotates only by the main winding when the speed is higher than a predetermined speed, An automatic voltage that is applied to the load only when the output frequency is equal to or higher than a predetermined value, and controls the generator output to a constant level by fully adjusting the field of the generator according to the deviation between the detected value of the generator output voltage and a reference value. In the regulator, the first motor is connected to a power source that drives the motor.
an output of the first reference voltage generation circuit connected to a control power source different from the reference voltage generation circuit and the power source; and an output of the first reference voltage generation circuit connected to a control power source different from the first reference voltage generation circuit and the power source; A control device for an electric generator, characterized in that the output of a second reference voltage generating circuit that generates a small output that does not affect the load is used as the reference value of the automatic voltage regulator. 1-