JPS607443B2 - Power supply device for linear motor for vehicle drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a power supply device for a linear motor for driving a vehicle, which has a primary winding arranged along a vehicle track and a secondary conductor provided on the vehicle side.

A power supply method as shown in FIG. 1 has been considered as a power supply method for a so-called ground primary linear motor in which a primary winding of a linear motor is provided on the track side and a secondary conductor is provided on the vehicle. That is, the primary winding 2 of the linear motor is divided into multiple sections SI, S2, S3, . . . in the direction of travel, and these multiple sections SI, S2, S3, . Multiple frequency converters 3A, 3B alternately
This is a method of supplying power via.

However, with this power supply method, it is necessary to excite both sections SI and S2 with two frequency converters 3A and 3B, respectively, so that thrust fluctuations do not occur when the vehicle 1 runs, for example, astride adjacent sections SI and S2. Therefore, when a vehicle straddles each section, two sections are energized at the same time, and when vehicle 1 is traveling within one section, only one section is energized by one frequency converter. Become. That is, the section sliding door position detection device 5 receives ON signals A1, A2, A3, . . . on the orbit.
... and OFF signals B1, B2, B3, ...
is detected and the section changeover switches 41, 42, 43,
. . . will be operated to repeat 1 section excitation and 2 section excitation. For example, when the vehicle 1 is traveling in the direction of the arrow and is located astride between sections SI and S2, the section effective position detection device 5 is
The N signal A2 is detected to energize the primary winding 2 of the section S2, and the primary winding 2 of the section SI remains energized at the time of the ON signal AI. Then, when the vehicle 1 completely enters section S2, the section switching sliding door position detection device 5 detects the OFF signal BI, opens the section changeover switch 41, stops excitation of section SI, and continues excitation of only section S2. . By repeating two-section excitation and one-section excitation in this way, fluctuations in thrust force at the straddling portions of each section are alleviated, and the adverse effects on the vehicle 1 are reduced. However, the above-described power supply method has the drawback that two-section excitation and one-section excitation are repeated, so that the apparent power fluctuates greatly each time the two-section excitation is repeated, and the power required for two-section excitation increases. An object of the present invention is to provide a method of feeding power to a linear motor that can suppress fluctuations and increases in the above-mentioned apparent power.

A feature of the present invention is that the primary winding divided into multiple sections is alternately excited by multiple frequency converters, or in a near motor, the primary winding is divided into multiple sections and connected in series. The primary winding is connected so that adjacent portions of each section of the primary winding span a vehicle length or more, and when a vehicle is present in this straddling portion, section switching is performed.

A specific example according to the present invention will be described below with reference to FIG.

On the track on which the vehicle 1 runs, there is a primary winding 2 of the linear motor.
are connected in series. Divide this into sections of appropriate length using leader lines to create multiple sections SI, S2, S3, etc.
Place... At this time, adjacent parts of each section are arranged so as to extend over a length longer than the length of the vehicle 1 (described later), and each section S1, S2, S3,...
. . . are connected so that power is supplied by frequency converters 3A and 3B. In the figure, one frequency converter 3
A feeds power to odd-numbered sections S1, S3, . . . , and the remaining frequency converter 3B feeds power to even-numbered sections S2, S4, . Section changeover switches 41, 42, 43, . . . are connected between the sections SI, S2, S3, . . . and the frequency converters 3A, 3B, respectively. On the orbit, there are ON signals A1, A2, A3, ... that tell the start of excitation of each section SI, S2, S3, ..., and stop of excitation of each section SI, S2, S3, ... OFF signals B1, B2, B3, . . . that notify the switching of sections S1, S2, S3, . . . and section switching signals CI, C2, C3, .
These signals are detected by a section switching position detection device 5 provided on the vehicle 1 or on the track. This section switching position detection device 5 is
Obtain the N-OFF signal and switch the section switch 41, 4
2, 43, . . . and control the signal of the gate block generation circuit 7. Further, a zero current detection device 6 such as a current transformer is provided on the output side of the frequency converters 3A and 3B.
The output signal is adapted to control the signal of the gate block generating circuit 7. The gate block signal generated by the gate block generation circuit 7 is instantaneously alternately switched to the two frequency converters 3A and 3B by the gate control circuit 8. This switching occurs only when the section switching signals C1, C2, C3, . . . of the section switching position detection device 5 and the ON signal of the zero current detection device 6 are input. Third
The figure shows the configuration of adjacent parts of each section according to the present invention, and although the U phase is shown, the same applies to the remaining V and W phases.

First, each terminal is drawn out from the primary winding 2 connected in series to form each section U1, U2, U3,... The terminals are drawn out so that a can be used for both terminals. Therefore, the primary winding 2 does not require any special work, and it is sufficient to simply connect the primary winding units arranged in a row in series, resulting in an extremely simple structure.

Next, the above operation will be explained with reference to the operation time chart shown in FIG.

First, when vehicle 1 travels in the direction of the arrow, vehicle 1
Immediately before entering section S2, the section switching position detection device 5 detects the ON signal A2 to start excitation of section S2 and gives the ON signal to the section changeover switch 42, and then the switch 42 is closed after a delay of a certain period of time. Ru.

Next, when the vehicle 1 completely enters the overlapping area between sections SI and S2, the section switching position detection device 5 detects the section switching signal C2, and this section switching signal and the drop current detection signal obtained by the zero current detection device 6 By ANDing with 6U, 6V, and 6W, the gate block signal of each phase is instantaneously transferred from the frequency converter 3B to 3A, operating the frequency converter 3B, and switching the already closed section changeover switch 4.
2 to sections S2, U2, V2, and W2, and stops power feeding to sections SI, U1, and VI'WI. At this time, section switching for each phase is performed sequentially with a phase difference (120 degrees in the case of three phases). As the vehicle 1 moves further, the section switching position detecting device 5 detects the OFF signal BI and opens the section switching switch 41 of the section SI whose power supply has already been stopped. Next, when the vehicle 1 enters the overlapping area between sections S2 and S3, the section switching signal C3 and the koto current detection signals 6U, 6V, 6W are ANDed in the same order as before.
As a result, the gate block signal of each phase is instantaneously transferred from the frequency converter 3A to 3B, and only the operation of the frequency converter 3B is stopped, and the power supply to sections S2, U2, V2, and W2 is terminated, and the section S3 , U3, V3, and W3 start. Furthermore, when the OFF signal B2 is detected as the vehicle 1 moves forward, the section changeover switch 42, whose power supply has already been stopped, is opened after a delay of 2 predetermined times. According to this embodiment, each section S1, S2
, S3, . Each section S1, S2, S3,...
Since the adjacent parts of ... are overlapped, one section switching can be performed in addition to the above-mentioned currentless switching, and therefore, when viewed from the wire side, the state is the same as that of a section crossing but not a section crossing.

That is, there is no fluctuation in the apparent power of the power supply, and there is no increase in it. Incidentally, compared to the conventional power supply method (Fig. 1), the apparent power fluctuation of the power supply can be reduced from 1'3 to zero, and the maximum apparent power of the power supply can be reduced to 1/2. In addition to being able to eliminate negative effects on electrical equipment, the economic effect associated with the reduction in power consumption is significant. still,
In addition, there is no need to change the gate signals of each in-phase thyristor group of the frequency converters 3A, 3B, . Therefore, the number of gate control circuits 8 can be reduced.

As explained above, the present invention divides the lead wire into a large number of sections by taking out the leader wire from the primary winding that is continuously connected in series in a plurality of sections. In addition, the section switching signal is used to switch sections when a vehicle exists in the straddling section, so when a vehicle runs between adjacent sections as in the past, the section switching signal is used to switch sections. It is not necessary to perform so-called two-section excitation, in which the two sections are excited at the same time, and one section is always excited, and the apparent power of the power supply can be reduced to 1'2, which is the amount that the two sections are not excited. The structure is simple and the economical effect is extremely large.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a conventional power supply device, FIG. 2 is a block diagram showing an embodiment of the power supply device according to the present invention, and FIG. 3 is a block diagram showing adjacent sections that are essential parts of the present invention. The relationship diagram shown in FIG. 4 is an operation time chart of the power supply device according to the present invention.

1...Vehicle, 2...Primary winding, SI,
S2...Section, 3A, 3B...
Frequency converter, 6...Zero current detection device, 7...
Gate block generation circuit, 8...gate control circuit.

younger brother's figure Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 A multi-phase primary winding divided into a large number of sections arranged along the vehicle track, a secondary conductor mounted on the vehicle, a plurality of frequency converters, and a multi-phase primary winding arranged in a plurality of sections along the vehicle track. The above-mentioned primary switch is equipped with a group of change-over switches arranged in a row so as to be connected alternately to the frequency converter, and a control means for sequentially changing over the change-over switch group so as to supply power to the sections one after another as the vehicle advances. The winding is constructed in series over a plurality of sections, the sections being separated by lead wires from the primary winding, and adjacent sections having a length longer than the total length of the secondary conductor. The vehicle drive is configured such that power is supplied across the primary winding of the section and by different frequency converters, and the power supply is switched when the secondary conductor is present in the straddle section of the section. Power supply device for linear motors.