JPH0219908Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a reference angle signal transmitter that transmits a reference angle signal of a synchro transmitter as a pseudo synchro signal. Generally, in a device that uses a synchro servo system, such as a stabilizer tracking system, calibration of the synchro receiver's atmospheric position and reference angle position is performed as part of daily inspection and adjustment. Furthermore, in the unlikely event that the system is stopped due to a failure, it is essential to reset each synchro receiver to its normal position in order to safely restart the system. In this way, when a reference angle signal is required, inspection and adjustment have conventionally been carried out by bringing a standard synchro transmitter into the side of the system. This standard synchro oscillator uses a complex mechanism to sequentially switch a ratio transformer, which is an inductance voltage divider, with a large number of precise leader lines for a large number of angles in order to accurately output an AC sine wave voltage according to the rotation angle. This method is large in size and expensive, e.g.
Since it costs 10,000 yen, it had the disadvantage that it could not be stored in the system and easily used at any time. The purpose of this invention is that although there are only six reference angles, the accuracy of the angle signal is not inferior to the conventional standard synchro oscillator, and it is much smaller and significantly cheaper, for example, 1,000 times lower than the conventional price. It is an object of the present invention to provide a reference angle signal transmitter that can be easily included in a device and can be conveniently used at any time. The invention will be explained below based on the drawings. 1st,
Figures 2, 3, and 4 are diagrams for explaining the principle of the present invention, and relate to the internal wiring of a conventional synchro oscillator. When the excitation voltage e ₁ is applied to the terminals R ₁ and R ₂ of the primary excitation winding, the three terminals of the secondary winding
S ₁ , S ₂ , S ₃ have a secondary voltage V _3-1 between terminals S ₃ and S ₁ ;
A secondary voltage V _2-3 is induced between terminals S ₂ and S ₃ and a secondary voltage V _1-2 is induced between terminals S ₁ and S ₂ . This can be expressed by the following equation with reference to FIG. {V _3-1 = Ksinθ・e ₁ V _2-3 = Ksin (θ+120°)・e ₁ V _1-2 = Ksin (θ+240°)・e ₁ } …(1) However, in equation (1), synchro oscillator The relative rotation angle between the primary excitation winding forming the rotor and the secondary winding forming the stator is θ, and the winding ratio between the primary excitation winding and the secondary winding is K. When θ=0°, the following equation is obtained from equation (1). The state shown in equation (2) can be equivalently realized by the circuit shown in FIG. 2 in a pseudo manner. In other words, a transformer with a primary winding 1 with a winding number of _{1 '} and a secondary winding ₂ with a winding number of ₂ ' has a turns ratio of ₂ '/ ₁ '=e ₂ /e ₁ = K√3/2...(3) Make it so that In equation (3), e ₂ represents the secondary output voltage. In Figure 2, the polarity of the winding is indicated by a black circle. terminal S ₃ and
Since the secondary voltage V _3-1 across S ₁ is O(v), terminal S ₃
and S ₁ are short-circuited and arranged as shown in Figure 2, the secondary voltages V _2-3 and V _1-2 have an absolute value equal to e ₂ and have opposite polarities, each of which is expressed by equation (2). Output signals equal to the secondary voltage and equivalent to the 0° angle case of the synchro oscillator of FIG. 1 are transmitted from terminals S ₁ , S ₂ and S ₃ . Now if we arrange the transformer secondary winding ₂ as shown in Figure 3,
If terminals S _{2 and} S ₃ are short-circuited, an output signal equivalent to that of the synchro oscillator shown in Fig. ₁ at an angle of 240° will be output from terminals _{S 1 ,} S ₂ and S _{3 .} Sent from. Similarly, the secondary winding of the transformer as shown in Figure 4
₂ and short-circuiting terminals S ₁ and S ₂ will produce output signals from terminals S ₁ , S ₂ and S ₃ equivalent to that of the synchro oscillator at an angle of 120°. In other words, as shown in Figures 2 to 4, the secondary winding ₂ of the transformer
and short circuits in sequence to connect terminals S ₁ , S ₂ and S ₃
By outputting the reference angle signal to the synchro oscillator, it is possible to transmit the reference angle signal with high accuracy. Furthermore, if the polarity of the excitation voltage e ₁ applied to the primary excitation winding ₁ is changed by 180° in Fig. 2, the polarity of the secondary voltage generated in the secondary winding ₂ will also change to the secondary voltage e ₂ shown in Fig. 2. The direction is opposite to that of the synchro oscillator, and an output signal equivalent to the case when the angle of the synchro oscillator is 180° is transmitted from terminals S ₁ , S ₂ and S ₃ . Similarly, in Figures 3 and 4, when the polarity of the excitation voltage _e1 is changed by 180°, the angle of each synchro oscillator is
The output signals equivalent to those for 60° and 300° are output from terminals S ₁ and S ₂
and emanates from S ₃ . These are clear from equation (1), and the above results are shown in Table 1.

【table】

[Table] As shown in Table 1, an accurate synchro reference angle signal can be obtained by switching the voltage between the three terminals S ₁ , S ₂ , and S ₃ . FIG. 5 is a circuit diagram showing an embodiment of the reference angle signal transmitter according to the present invention. Taking a 115 (V) system synchro as an example, the winding ratio of the synchro oscillator is K=
Since 90/115=0.7826, equation (1) when θ=0
becomes the following formula. {V _3-1 = K・sin0゜・e ₁ = 0 (v) V _2-3 = K・sin120゜・e ₁ = 0.678・e ₁ (v) V _1-2 = K・sin240゜・e ₁ =−0.678・e ₁ (v)} …(2) However, the sign (−) indicates the phase. In Fig. 5, when the excitation voltage of the single-phase transformer T ₁ is e ₁ , an AC power supply voltage of 115 (V) is applied, and the secondary voltage is e ₂ , e ₂ = K·√3/2e ₁ , that is, e ₂ / A single-phase transformer T ₁ is manufactured so that e ₁ =0.678, and each terminal indicating the reference angle of synchronization is connected to terminals a and b of the secondary winding of the single-phase transformer T ₁ . The connection method is, for example, a terminal with a reference angle of 0° is a changeover switch.
SW ₁ is connected to terminal a, changeover switch SW ₂ is connected to terminal b, and changeover switch SW ₃ is connected to terminal a. The other reference terminals are similarly connected as shown in FIG. Changeover switches SW ₁ , SW ₂ , and SW ₃ perform switching operations in conjunction with each other. According to this switching operation, three output terminals
Two terminals among S ₁ , S ₂ , and S ₃ are short-circuited, and an AC voltage proportional to √3/2e ₁ is applied between this short-circuited terminal and the remaining one _terminal . It is possible to switch by changing the combination of _{2 and S3} , and the three output terminals _S1 , _S2 , _S3 have 0°, 60°, 120°, and 180°, which is equivalent to the 3-wire output signal of a synchro oscillator. , 240° and 300
It is possible to produce a trowel that transmits an angle signal of one or more reference angles. As described above, although the present invention has a small reference angle of 6, it is not inferior to the conventional standard synchro oscillator in terms of the accuracy of the angle signal, and is much smaller and significantly cheaper. To provide a reference angle signal transmitter that can be easily built into a device and conveniently used at any time at a cost of about a fraction of the cost.

[Brief explanation of the drawing]

1, 2, 3, and 4 are diagrams for explaining the principle of the present invention, and FIG. 5 is a circuit diagram showing an embodiment of the reference angle signal transmitter according to the present invention. T ₁ ... Single phase transformer, SW ₁ , SW ₂ and SW ₃ ...
Changeover switch, R ₁ , R ₂ , S ₁ , S ₂ , and S ₃ ...terminals.

Claims (1)

[Scope of utility model registration request] A single-phase transformer inputs an AC power supply voltage e ₁ to the primary winding and outputs an AC voltage proportional to √3/2e ₁ to the secondary winding, and is connected between this single-phase transformer and three output terminals. 2 out of 3 output terminals
It has a changeover switch that short-circuits the terminals and changes the combination of the three output terminals so as to apply an AC voltage proportional to √3/2e ₁ between the short-circuited terminal and the remaining one terminal. By this switching operation, a reference angle signal of one or more of 0°, 60°, 120°, 180°, 240°, and 300° is converted into an angle signal equivalent to the 3-wire output signal of the synchro oscillator. Reference angle signal transmitter.