JPS5862711A - Automatic voltage adjusting device for permanent magnet type generator - Google Patents

Abstract

PURPOSE:To keep a voltage across an autotransformer constant, by connecting the primary winding of a transformer having the secondary winding and an autotransformer in series for input terminals and adjusting the impedance of the secondary winding. CONSTITUTION:The primary winding L1 of a transformer T1 having the secondary winding and an autotransformer T2 are connected in series and a voltage V-V+V' with fluctuation is applied between terminals A and B. A variable impedance P is connected to the secondary winding L2 of the transformer T1, a sliding pint (b) can be adjustable from a point (a) to a point (c), and the (b) is slided to compensate a voltage V' depending on the amplitude of the fluctuation component V' of the power supply voltage. A load Z is connected to output terminals C, D of the autotransformer T2. Thus, the load Z can always have a constant voltage V. This system is suitable for a permanent magnet type generator of two-pole construction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic voltage regulator for a permanent magnet keepsake electric machine.

As is well known, the optical synchronous generator, which uses permanent magnets for its magnetic poles, can be used not only for private power generation equipment and emergency power systems, but also for the actuator motor power source for driving the speed governor, the power source for the electric speed governor, and the power source for the two-rotation needle. .

It is often used as a power source for AC exciters for brushless generators. However, in a permanent magnet keepsake electric machine, the field strength is fixed by the permanent magnet and is constant, so the induced electromotive force of the armature is proportional to the rotation speed, so even if the load is constant, the driving source of the generator is The disadvantage is that the output voltage fluctuates greatly due to torque fluctuations and other disturbances.

In order to cope with this, conventional methods include installing a full-scale constant voltage device between the generator and the load, or adjusting the primary reactance of the autotransformer by opening and closing it (Japanese Patent Publication No. 44-6882.
-25045) etc. are adopted. however,
These methods have drawbacks such as large-scale and expensive devices, short lifespans of switches, and slow response speeds, and none of them have been practically satisfactory.

SUMMARY OF THE INVENTION An object of the present invention is to improve the drawbacks of an automatic voltage regulator between a permanent magnet keepsake electric machine and a load, and to provide an automatic voltage regulator with a simple structure but high performance.

This will be explained below based on the illustrated embodiments.

In FIG. 1, T0n T2 are transformers, Ll is the primary wire of the transformer TI, and L2 is the secondary wire of the transformer TI. P is a variable impedance, and both ends A and C are 2 of the transformer TI.
A variable impedance of 0 to P is realized by connecting to the next wire and moving the sliding point from a to e.

The primary wire L1 of the transformer Tl and the transformer - are connected in series,
A load 2 is connected to both ends A and B of the transformer T, which are input terminals, and both ends C and D of the transformer T are output terminals.

Next, the operation of this circuit diagram will be explained. Now, if the reference voltage is V, and the input voltage fluctuates in the range of v, , v+v',
It is assumed that a characteristic is obtained in which the output voltage is constant at V-. The voltage sharing between the primary coil Ll of the transformer TI and the coil of the transformer T is set in advance to be v' and v, respectively. More specifically, the sliding actance of the primary wire L1 changes depending on the magnitude of the secondary current, and the sliding point of the impedance P that determines the magnitude of the secondary current is set to 0 at the lower end.
At a point, when the impedance is set to the maximum P, the primary coil L1 is made to share the voltage V'.

Now, when the input voltage becomes v+v', the primary wire Ll
shares the voltage of V', so the output voltage is ■.

Next, when the input voltage becomes ■, the impedance P
2 of transformer TI by adjusting the sliding point at point a at the upper end.
The primary winding #L1 of transformer TI becomes effectively short-circuited on the next side.
and secondary winding L2 are wound in opposite directions,
Since the actance of transformer T1 becomes zero, the primary wire L
The shared voltage of 1 is zero, and the output voltage is V.

Also, when the input voltage fluctuates between v-v+v',
The impedance P can be adjusted so that the shared voltage of the primary coil "Ll" becomes ov', and the output voltage is always V.Furthermore, in order to keep the output voltage as constant as possible, it is necessary to By adjusting the magnetic circuit of the device T1, the shared voltage of the primary coil is always equal to the increment from the reference value of the input voltage in combination with the magnitude of the secondary current. In the practical circuit diagram in the example, the same reference numerals as in FIG. 1 represent the same elements.

P is an impedance part, and the diode bridge S
D1#) Consists of transistor Qt, Qs Is Qs and other parts. R is an output voltage detection section, which is a sub-transformer 'Is diode bridge S D
, , potentiometer VR, etc. S is a comparison amplifier section, one input terminal E of the comparison amplifier V is connected to the output signal of the output voltage detection section R, and the other input terminal F is connected to the reference voltage. U is a power supply section for the comparison amplification section S, which includes a sub-transformer th diode bridge SD4. It consists of a smoothing and stabilizing circuit. Q is another power supply section, which consists of a sub-transformer L, a diode bridge 8D, and a smoothing/stabilization circuit, whose power output is supplied to the impedance section PK, and a portion is supplied to the comparator amplifier V as a reference voltage. Ru.

In the figure, the basic operation is explained as follows: the input voltage fluctuates between 100V and 150V, whereas the output voltage is kept constant at 100V. If the input voltage is 100V, the output signal of the output voltage detection section R is applied to the input terminal E of the comparator amplifier V, and compared with the reference voltage, if they match, the output of the comparator amplifier V becomes zero, and the impedance section P transistor Q6 is made non-conductive.

Then transistor Q5. Q□ is a conductive state and orange,
A short-circuit current flows through the secondary wire L2 of the transformer T1, and the primary wire actance becomes zero, so the voltage sharing also becomes zero. Therefore, the input voltage - the output voltage - 100V.

Next, when the input voltage reaches the maximum of 150V, the output of the output voltage detection section R reaches the maximum and is applied to the comparator amplifier V.
The output signal of the comparator amplifier also becomes maximum, making the transistor Q of the impedance section P conductive. Then transistor Q5. When Q is in the cut-off state, the secondary current of transformer T+0 becomes zero, so the primary wire L1 actance becomes maximum, and the maximum voltage of 50V is shared, and the output voltage changes. is maintained at 100v.

A specific experimental example using this circuit diagram is as follows.

(1) Output voltage characteristics at no load (2) Output voltage characteristics at load As shown in the above experimental data, 100 to 150 of the input voltage
#1 to 2% of the output voltage during practical load in the range of V
can be maintained within

Further, in the above description, a transistor is used as the variable impedance element, but other control elements such as a bidirectional three-terminal thyristor (trade name: TRIAC) can be used.

The automatic voltage regulator constructed in this manner can be applied to a permanent magnet flywheel alternator having a two-pole structure as shown in the third figure.

In the figure, 1.1' is a winding, 2.2' is an iron core, and the pair of these windings and iron core constitutes a two-pole armature. The armature is fixed to the crankcase main body (not shown) through bolt holes 3 with equal pressure. 4
is a flywheel, and a rotating field is constructed by fixing a permanent magnet 5 inside the flywheel.

As described above, according to the automatic voltage regulator according to the present invention, it is possible to provide a simple and highly accurate automatic voltage regulator suitable for a permanent magnet type alternating current generator.

[Brief explanation of the drawing]

Fig. 1 is a principle diagram as an embodiment of the present invention, Fig. 2 is a circuit diagram of an automatic voltage regulator as an embodiment of the present invention, and Fig. 3 is a two-pole structure suitable for the automatic voltage regulator of the present invention. A structural diagram of a permanent magnet alternator is shown. T+, T2: Transformer, Ll: Primary wire, L2: Secondary wire, P: Variable impedance, z: Load, v: Comparison amplifier, 1.1' is seed winding, 2.2': Neko iron core, 4: flywheel, 5: field magnet. 1st decoy vA3 inhibition

Claims (2)

[Claims] (1) - A transformer consisting of a secondary coil and a secondary coil is connected in series with an autotransformer as an input terminal, a variable impedance is connected to the secondary coil, and both ends of the autotransformer are connected. Automatic voltage regulator with output terminal. (2) The automatic voltage regulator according to claim 1, wherein a semiconductor current control element is used as the variable impedance, and a constant voltage output is obtained while controlling the semiconductor current control element according to the output voltage.