JPS6043088A - Plural drive thyristor motor apparatus - Google Patents

Abstract

PURPOSE:To provide load balance between thyristor motots by composing armature windings of the motors of 2 sets of 3-phase windings in which electric angles of 30 deg. are displaced from one another, and connecting in cascade one set of 3-phase windings of the all motors. CONSTITUTION:The armature windings of thyristor motors 21, 22 are composed of 2 sets of 3-phase windings, one set is led into the terminal at the neutral point side, and not led at the other set. In other words, 9 leads are provided at the terminal. 2X3-phase windings of the 2 motors are respectively connected in cascade. Thus, since the current values flowed to the armature windings of the both motors become always equal, the torques generated from the both motors can be readily brought to coincidence.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a plurality of thyristor motors, a power conversion device,
This invention relates to an improvement of a multi-drive thyristor motor device by combining the following.

[Technical background of the invention and its problems]

Thyristor motor devices have recently been widely used as large-capacity variable-speed drive devices, mainly in wind and hydraulic machines such as pumps, blowers, and compressors.

This thyristor motor device generally has an input transformer.

It is composed of a combination of a thyristor converter and a thyristor motor, and a shaft position detector is attached to the motor shaft to feed back the shaft position signal, thereby establishing a self-control control system. Moreover, Zyristor Chiyo is basically a synchronous type 11fi, 141U glaze, and constitutes a brushless excitation system by a combination of a rotary exciter and a rotary rectifier.

Usually, one set of thyristor motor devices is used for one mating machine. However, when the installed capacity increases, the purpose of reducing the capacity of the spare thyristor motor is
In order to ensure compatibility with other smaller capacity thyristor motor devices installed in the same plant, one partner machine may be driven by multiple sets of thyristor motor devices.

FIG. 1 shows the equipment configuration conventionally employed in this case, and is an example in which one fan is driven by two thyristor motors from both sides.

In the figure, 1 is an input transformer for converting the received power supply voltage to an appropriate voltage, and 2 is an input transformer that converts the input commercial power to an arbitrary voltage of 5.
3 is a thyristor motor that is supplied with power from the power converter 2 and drives a partner machine; 4 is attached to the rotating shaft of the thyristor motor 3 and detects the rotational phase of the shaft, and the power converter 2 - The magnetic current is supplied to the field winding 8 from the rotating rectifier 7 on the rotating shaft of the excitation system 5, an AC exciter 61 consisting of a thyristor. .

The other set is the same (consisting of 211 to 18).

The conventional system configuration shown in FIG. 1 has the following five problems. One of them is to convert one partner machine into two
Because they are driven in parallel by a set of thyristor motor devices,
It is difficult to properly balance the load factors of the two sets of thyristor motors. In other words, the coupling phase angles between the two thyristor motors and the mating machine may not match.

If the terminal voltages, field currents, and field phases of two thyristor motors are different, one thyristor motor will carry the majority of the load. .Also, another problem is that since the core winding of the thyristor motor is 3-phase, the torque ripple generated by the two thyristor motors becomes relatively large. ．For machines, bent shafts pose a risk of stress affecting the life of the shaft.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and it constantly balances the torque generated by two thyristor motors, significantly reduces the amount of torque ripple, and reduces the risk of bending stress. 1 [Summary of the Invention] In order to achieve the above object, the present invention provides a thyristor motor whose LD child winding is rotated by 30 degrees. 2×3 out of phase
It is characterized by having a phase winding, the middle/careful side of one winding being exposed to a terminal box, and the armature wires of two thyristor motors being connected in series.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows an embodiment of the present invention, and since the same reference numerals as in FIG. 1 are the same, the explanation will be omitted. In the same figure, reference numerals 21 and 22 are thyristor motors that drive the mating machine from both sides on the same axis.
A base shaft position detector 4 is attached to feed back shaft position signals to the power converters 2 and 12.

The electric windings of the thyristor motors 21 and 22 are composed of two sets of three-phase windings, one set is drawn out into the neutral point side power center 1: child box, and the other set is not drawn out.

In other words, there are nine outlets in the terminal box. The 2×3 phase windings of the two thyristor motors are each connected in series. FIG. 3 shows this specific cascade connection method.

According to this configuration, since the current value flowing through the armature tightening of both types of motors is always the same, it is easy to match the torque generated by one type of motor, and therefore it is possible to balance the loads of both types of motors. I can do it.

In addition, the 8 wires of the armature of the electric motor each have 3 wires that are slightly out of phase.
Since there are 2 sets of phase windings (7 sets), the torque ripple generated by the motor is equivalent to the case of power feeding from a 12-pulse converter, and is reduced to 1 ripple compared to the configuration shown in Figure 1. The damage caused by bending stress on the shaft between it and the mating machine is greatly reduced.

FIG. 4 shows another embodiment of the equipment configuration of the present invention. In this circuit configuration, power converters 2 and 12
Power is supplied to the two windings of the thyristor motor 23, and is then supplied in series to the two windings of the second electric motor via its neutral point.

〔Effect of the invention〕

As explained above, according to the present invention, when one load is driven by a plurality of thyristor motor devices, it is possible to always keep the load balance among the thyristor motors precisely, and also to provide 12-pulse power supply. Accordingly, it is possible to provide an effective multi-drive iris motor device ξ that can significantly reduce the value of torque ripple.

[Brief explanation of drawings]

FIG. 1 is a conventional configuration diagram of a multi-drive thyristor motor device, FIG. 2 is a diagram showing the components of an embodiment of the present invention, and FIG. 3 is a diagram showing a method of cascade connection of armature windings of a thyristor motor. FIG. 4 is a diagram showing another embodiment of the present invention. 1.11 Human power transformer, 2.12...Power converter. 3, 13, 21.22.23.24... Thyristor motor, 4.14... Shaft position detector, 5.15... Excitation device, 6.160. AC exciter, 7.17... Rotating rectifier. 8.10...Field winding. (7317) ]・Person Patent Attorney Noriyuki Chikanori (
r, or 1 person) Figure 1 Figure 3

Claims (1)

[Claims] In a system in which one mating machine is driven by a chain made of multiple thyristor motors, the armature winding of each thyristor motor is composed of two sets of three sets of windings that are out of phase with each other by an electrical angle, and all thyristor motors are A multi-drive thyristor motor device characterized in that three sets of windings in one set of the motor are connected in series.