JPS6129236B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting an induced voltage in a linear synchronous motor armature coil.

Recently, ultra-high-speed electric railways using linear synchronous motors (hereinafter referred to as linear motors) have been attracting attention. Specifically, this is a planar development of an electric motor, with an armature coil placed on a ground track, a field generator mounted on the vehicle, and the driving force between them used as propulsion force to drive the vehicle. In controlling the operation of such a linear motor, it is important to accurately know the induced voltage in the armature coil.

By the way, in a general rotary synchronous motor, the length of the feeder from the power converter as a power supply device to the electric motor is constant, so the impedance of the feeder is constant. Therefore, by regarding this impedance as part of the impedance of the armature coil, the induced voltage of the motor can be easily determined.

On the other hand, in a linear motor, in order to reduce the capacity of power converters 1A and 1B, as shown in FIG. Connect switch 3,
Electricity is supplied by sequentially opening and closing the switches 3 as the vehicle 4 carrying the field generator moves. Therefore, due to the movement of the vehicle 4, the power converters 1A, 1
Feeder 5 from B to switch 3 that is being fed
The lengths of A and 5B change, and their impedance also changes greatly. Therefore, like a rotary synchronous motor, the output voltages V _A and V _B of the power converters 1A and 1B
Even if the output power sources I _A and I _B were simply detected, it was not possible to accurately detect the induced voltage in the armature coil 2 necessary for controlling the operation of the linear motor due to the voltage drop in the feeders 5A and 5B.

This invention was made based on the above-mentioned circumstances, and provides an induced voltage detection in the armature coil of a linear synchronous motor that can accurately calculate the induced voltage in the armature coil in the section where power is supplied from the power supply. The purpose is to provide equipment.

First, the concept of this invention will be described. Second
The figure shows an equivalent circuit of the circuit consisting of the power converter 1A or 1B, the feeder 5A or 5B, and the armature coil 2 shown in FIG. In FIG. 2, the symbols not explained above are as follows.

1X: Power converter 1A or 1B.

V _x : Output voltage V _A or V of power converter 1X
_B.

I _x : Output current I _A or I of power converter 1X
_B.

5X: Feeder 5A or 5B.

k: Feeder 5 between the power converter 1X and the armature coil 2 of the switched switch 3
Length of X. In addition, the length k of feeder 5X
The power converters 1A and 1B differ only in the length of the armature coil 2, but the impedance of the feeder 5X due to this length is sufficiently smaller than the impedance of the armature coil 2, so it is ignored.

R: Resistance per unit length of feeder 5X.

L: Inductance per unit length of feeder 5X.

R _c : resistance of armature coil 2.

L _c : Inductance of armature coil 2.

E _x : Induced voltage in armature coil 2 excited by power converter 1X.

When the induced voltage _Ex is calculated from the equivalent circuit shown in FIG. 2 using the above symbols, the following equation is obtained.

E _x = V _x - (I _x R _c + L _c dI _x / dt) - {RkI _x + Ld (kI _x ) / dt}... (1) Therefore, each induced voltage E _A and E _B is E _A =V _A −(I _A R _c +L _c dI _A /dt) −{RkI _A +Ld(kI _A )/dt}……(2) E _B =V _B −(I _B R _c +L _c dI _B /dt ) −{RkI _B +Ld(kI _B )/dt} (3). From this, the total induced voltage E is E=E _A +E _B =(V _A +V _B ) −{R _c (I _A + I _B )+L _c d(I _A + I _B )/dt
} −{Rk(I _A +I _B )+Lkd(I _A +I _B )
/dt}... (4).

In an embodiment of the present invention described below, the induced voltage E of equation (4) is determined.

An embodiment of the present invention will be described below with reference to FIG.

FIG. 3 is a block diagram of the induced voltage detection device of the linear motor armature coil in this embodiment shown together with one phase of the ground primary type linear motor. Note that the same parts as in FIG. 1 are given the same reference numerals, and explanations of those parts will be omitted.

In Fig. 3, 6A and 6B are voltage converters 1
A and 1B are current detectors that detect currents proportional to the output currents I _A and I _B ; 7A and 7B are power converters 1
This is a voltage detector that detects a voltage proportional to the output voltages V _A and V _B of A and 1B. 8A and 8B are isolation amplifiers that amplify the outputs of voltage detectors 7A and 7B;
A and 9B are isolation amplifiers that amplify the outputs of the current detectors 6A and 6B. 10 is an isolation amplifier 8A, 8
11 is an adder that inputs the outputs [V _A , V _B ] of B and adds them together; 11 is the output [I
_A , _IB ] and adds them together.

12 amplifies the output of the adder 11 and generates a voltage [-R _c (I _A + I _B )] due to the resistance R _c of the armature coil 2
13 is a differentiator which differentiates the output of the adder 11 and obtains the voltage [-L _c d/dt (I _A +I _B )] due to the inductance L _c of the armature coil 2. 14 is a feeder length calculation circuit which inputs section information S for controlling the switch 3 and closes the switch 3 from the power converter 1X from a predetermined distance on the travel path corresponding to each section information S. The length k of the feeder 5X up to the armature coil 2 is determined. That is, feeder length calculation circuit 1
4, since the section information S is input, it is possible to detect where the vehicle 4 is currently located. In other words, the switch 3 is sequentially opened and closed according to the section information S, the armature coil 2 is also sequentially excited and deenergized, and the vehicle 4 runs accordingly.In this case, the switch 3 corresponds to the closed switch 3. This means that the vehicle 4 exists at the position of the armature coil 2 where the vehicle 4 is located, and the feeder 5A of the corresponding armature coil 2 and the switch 3, 5B
The position above is determined. Therefore, the position on the feeder 5A, 5B where the armature coil 2 where this specified vehicle 4 is located and the position from the previously known power converter 1A, 1B to the feeder 5A, 5B are determined. The feeder length k can be calculated by taking the absolute value of the difference between the feeding point and the feeding point.
15 is a multiplication circuit which inputs the output of the adder 11 and the output of the feeder length calculation circuit 14 and multiplies both. 16 amplifies the output of the multiplier circuit 15 and increases the voltage [-Rk(I _A +
I _B )]. 17 is a multiplication circuit 15
Differentiate the output of the feeder inductance L
This is a differentiating circuit that obtains the voltage [-Lkd/dt (I _A + I _B )]. 18 is an adder 10, an amplifier 12,
This is an adder that inputs the outputs of the differentiator 13, amplifier 16, and differentiator 17 and adds them. A filter circuit 19 removes harmonic noise from the output of the adder 18, and its output is the induced voltage E to be obtained.

In the configuration as described above, the switch 3 is closed by the section information S as the vehicle 4 moves, and is opened when the vehicle 4 passes. In this case, when the vehicle 4 straddles two armature coils 2 as shown in FIG. When the coil 2 is on, only the switch 3 of the coil 2 is closed.

While the vehicle 4 is moving in this manner, the current detectors 6A, 6B and the voltage detector 7
A, 7B always detect currents and voltages proportional to the output currents I _A , I _B and voltages V _A , V _B of the power converters 1A, 1B. Voltage detector 7A, 7B
The voltage detected by the isolation amplifiers 8A, 8
Amplified by B and added by adder 10 [V _A +
V _B ] is done. Similarly, the currents detected by current detectors 6A and 6B are amplified by isolation amplifiers 9A and 9B, and added by adder 11 [I _A +I _B ]. This output is amplified by the amplifier 12, and the voltage due to the resistance R _c of the armature coil 2 [-R _c (I _A +
I _B )] and differentiate it using the differentiator 13,
The voltage [-L _c d/dt (I _A + I _B )] due to the inductance L _c of the armature coil 2 is determined.

Also, from the section information S that controls the switch 3, the length k of the feeder 5X from the power converters 1A, 1B to the armature coil 2 where the switch 3 is closed.
is obtained by the feeder length calculation circuit 14, and its output is multiplied by the output of the adder 11 by the multiplier 15 [k
(I _A + I _B )] and feeder 5X by amplifier 16
Voltage due to resistance R [-Rk (I _A + I _B )]
is determined, and the voltage [-Lkd/dt(I _A +I _B )] due to the inductance L of the feeder is determined by the differentiator 17. and adder 10, amplifiers 12, 16
The outputs of the differentiators 13 and 14 are added by an adder 18, and harmonic noise is removed by a filter circuit 19 to obtain an induced voltage E.

As described above, according to this embodiment, from the distance on the traveling road determined corresponding to the section information S, from the power converters 1A, 1B to the armature coil 2 corresponding to the section where the vehicle 4 is traveling. Find the length k of the feeders 5A, 5B, and use the obtained length k of the feeders 5A, 5B and the feeders 5A, 5B.
Calculate the voltage drop of the feeders 5A and 5B based on the impedance per unit length of , and take this voltage drop into account to calculate the induced voltage of the armature coil 2 in the section where power is supplied from the power converters 1A and 1B. Since E is calculated, it is possible to accurately calculate the induced voltage E in the armature coil of a long-distance linear motor.

Note that this invention is not limited to the above embodiments. For example, in the above embodiment, when calculating the induced voltage, the induced voltage is calculated after adding the output voltage and output current of each power converter. After calculating the voltage, the results may be added to obtain the total induced voltage. It goes without saying that various other modifications can be made without departing from the gist of the invention.

As explained above, according to the present invention, it is possible to provide an induced voltage detection device of an armature coil of a linear synchronous motor that can accurately calculate the induced voltage of the armature coil in the section where power is supplied from the power source. .

[Brief explanation of the drawing]

Figure 1 is a circuit diagram for one phase of the ground primary type linear synchronous motor, Figure 2 is the power converter shown in Figure 1,
An equivalent circuit of a circuit consisting of a feeder and an armature coil. FIG. 3 is a block diagram of an embodiment of the present invention. 1A, 1B... Power converter, 2... Armature coil, 3... Switch, 4... Vehicle, 5A, 5B...
Feeder, 6A, 6B...Current detector, 7A, 7
B... Voltage detector, 8A, 8B, 9A, 9B...
Isolation amplifier, 14... feeder length calculation circuit.

Claims (1)

[Scope of Claims] 1. Among the armature coils arranged in sections according to the vehicle travel route, the sections are sequentially designated in the vehicle travel direction by section information. In a linear synchronous motor in which power is supplied from a power source to an armature coil, the armature coil to which power is supplied can be specified by the section information, and the position of the armature coil on the feeder known by this identification and the a feeder length calculation circuit that calculates the feeder length k from the power supply to the armature coil supplied with power by taking the absolute value of the difference between the power supply position and the power supply position from the power supply to the feeder; and an output from the power supply to the feeder. a voltage detector that detects the voltage Vx output from the power supply to the feeder, a current detector that detects the current Ix output from the power supply to the feeder, and a calculated value of the output Ix of this current detector and the resistance Rc of the armature coil alone. A first circuit that calculates (-Ix・Rc), a value dIx/dt obtained by differentiating the inductance Lc of the armature coil alone and the output of the current detector
a second circuit for calculating the calculated value (-Lc・dIx/dt); and calculating the resistance Rf per unit length of the feeder, the output k of the feeder length calculation circuit, and the output Ix of the current detector. A third circuit that calculates the value (-Rf・k・Ix), the inductance If per unit length of the feeder, the value d(k・Ix) obtained by differentiating the multiplication output of the current detector and the feeder length calculation circuit )/dt and an armature to which power is supplied by adding the outputs of the fourth circuit and the first to fourth circuits to obtain the calculated value (-Lf・d(k・Ix)/dt). 1. An induced power detection device for an armature coil of a linear synchronous motor, characterized by comprising an adder for determining the induced voltage Ex of the coil.