JPS5910957Y2 - Rotation tuning device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rotation synchronization device for controlling the synchronized operation of two rotating machines.

A conventionally known rotary tuning device of this type is shown in FIG.

In the figure, 1 is the Selshin transmitter attached to the No. 1 rotating machine, 2 is the Selshin type control transformer attached to the No. 2 rotating machine, and 3 is the DC voltage for controlling the axis angle deviation signal of both Selshins. A phase discrimination circuit whose purpose is to convert
4 is a shaft angle deviation signal obtained from a control transformer attached to the No. 2 rotating machine, and 5 is an output signal obtained from the phase discrimination circuit 3.

Next, the operation will be explained.

If the synchro transmitter 1 installed on the No. 1 rotating machine and the synchro type control transformer 2 installed on the No. 2 rotating machine are connected as shown in Figure 1 to construct a control synchro system, the The rotation angle phase difference of the rotating machine is obtained from the rotor of the synchronized control transformer 2 as a shaft angle deviation signal 4.

This signal is modulated at the AC power frequency, and the modulated wave phase is reversed depending on whether the shaft angle phase is positive or negative. Therefore, the phase discrimination circuit 3 performs synchronous rectification based on the AC power phase, and outputs the control output voltage. Get 5.

Since the conventional tuning device is constructed as described above, it has the following drawbacks.

1. The control angle is narrow because it uses cersin.

2. Since Celsyn is used, a control synchronization error occurs due to harmonic power inside the synchronizer.

This invention was made with the aim of eliminating the above-mentioned drawbacks, and by using two absolute type digital transducers and calculating the deviation digitally, the control angle can be widened (approximately 180 degrees Furthermore, the present invention provides a rotational tuning device in which accuracy can be increased by arbitrarily increasing the number of pulse bits.

An embodiment of this invention will be described below based on the drawings.

First, we will explain how to compare when using an absolute digital transducer.

Figure 2 shows the output and rotation angle of this absolute type digital transducer, but the actual output is an arbitrary number of bits of pure binary numbers, and Figure 3 shows the output of the two absolute digital transducers shown in Figure 2. It shows the rotation angle difference of the digital transducer and the compared output. In this pure binary comparison, the complement of either output is taken, and the sum is subtracted and compared, so it is a complement calculation method, so the actual comparison is The possible range is limited to a continuous range from 0° to 360°, and the condition is that any one of the rotational axes is advanced.

Of course, this comparison output is a pure binary number.

Next, an example based on the above comparison method will be shown.

In Fig. 4, 6 is the absolute type digital transducer installed on the No. 1 rotating machine, and 7 is the 1
Absolute type digital transducer for No. 2 similar to No. 6 installed on the No. The comparison output signal characteristics obtained are as follows: 10 is a digital/analog converter that converts the comparison output 9 from digital to analog because it is a pure binary output; 11 is a bias circuit; the output is output by the complement computation comparison circuit 8; As shown in signal characteristic 9, it takes only a deviation of 0 to 360°, and it only exists when any one of the rotational axes is advancing, so here we deliberately set the deviation of any one of the absolute type digital transformers. User 6 or 7 to 18
By shifting 0°, consider that point as the tuning point.
Add a bias equivalent to 180' deviation.

12 shows the rotation angle deviation output characteristic obtained by the bias circuit.

As described above, this device uses absolute type digital transducers 6 and 7 as detectors, and complement comparator circuit 8.
A pure binary comparison is performed using the digital/analog converter, the pure binary digital signal is converted into an analog signal, and a 180° deviation is intentionally added using the bias circuit 11, thereby making the 180° deviation point the actual tuning point. This makes it possible to detect deviations of ±180°.

As described above, according to this invention, two absolute digital transducers are used as angle detectors for each rotating axis, and the signals are compared by a complement calculation circuit, so the detected angle is ±180°. The accuracy can be easily increased by increasing the number of bits of the absolute digital transducer.

[Brief explanation of drawings]

Figure 1 is a diagram showing the configuration of a rotational tuning device using a conventional Selshin Electric machine, Figure 2 is an output characteristic diagram of an absolute type digital transducer, and Figure 3 is the complement calculation of two absolute type digital transducers. Comparative output characteristic diagram. FIG. 4 is a structural diagram showing a rotational tuning device according to an embodiment of this invention. 1 is the Seresin transmitter for the No. 1 rotating machine, 2 is the Sersin type control transformer for the No. 2 rotating machine, 3 is the phase discrimination circuit, 4 is the shaft angle deviation signal characteristic, 5 is the output characteristic, and 6 is the No. 1 rotating machine circle. Absolute type digital transducer, 7 is absolute type digital transducer for No. 2 rotating machine,
8 is a complement arithmetic comparison circuit, 9 is a comparison output characteristic, 10 is a digital/analog converter, 11 is a bias circuit, and 12 is a rotation angle deviation output characteristic.

Claims (1)

[Scope of utility model registration request] The first one attached to the rotating shaft of each of the first and second rotating machines.
A second absolute digital transducer, a complement computation and comparison circuit that compares the outputs of each absolute digital transducer with pure binary numbers, and a digital/analog circuit that converts the pure binary digital signal of this complement computation and comparison circuit into an analog signal. A converter, comprising a bias circuit that applies a bias corresponding to a 180° deviation to the output of the digital/analog converter, and the rotation angle deviation output from the bias circuit is used as a uniform speed signal. Tuning device.