JPS5889083A - Synchronization energizing device for brushless synchronous motor - Google Patents

Abstract

PURPOSE:To simplify the structure of an electronic circuit and to improve the reliability of a motor by providing a necessary electronic circuit for controlling the synchronous energization of the motor to the stator side. CONSTITUTION:When an AC power source voltage is applied through a breaker 4 to the stator 3 of a synchronous motor, and motor is started as an induction motor. The AC voltage induced at the field coil 2 of the motor is applied through a rotary transformer 14 to a voltage detector 10. When the fact that the frequency and the phase polarity of the field induced voltage arrive at the synchronization energizing conditions by a slip frequency detector 11 and a polarity detector 12, a signal is outputted from a gate signal generator 13 to a light projector 15. The light signal projected by the projector 15 is applied through a photodetector 16 to the gate of a photothyristor switch 5A. In this manner, the DC output of a rotary rectifier 8 is applied to the field coil, and the motor is synchronized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synchronization device for a brushless synchronous motor using an optical thyristor switch.

Synchronization of the synchronous motor is carried out by first starting the synchronous motor as a spinning magnetic motor, and when it reaches a speed that allows synchronization, which is close to the synchronous speed, by exciting the field winding with DC current.

In order to ensure synchronization (2), it is necessary that all 9 frequencies and internal phase angles be within the required limits C2.

FIG. 1 shows a conventional synchronization device for a brushless synchronous motor.

Figure 1 (2) The rotor l of the synchronous motor is the field winding 2.
In addition, the motor is equipped with a brake winding (not shown), and is started as an induction motor by applying a current source voltage through the stator 31 and the interrupter 4. When the rotor l speeds up and reaches around the synchronous speed, the silisk switch 5 becomes conductive and a DC voltage is applied to the field winding 2 to perform a synchronization operation, but the details are as in 1. It is a regular p.

When the power switch 7 of the rotary transformer I16 is closed, an AC f& voltage is applied to the rotary transformer 8 via the rotary transformer 6. At this time, the thyristor switch 5 is non-conducting and no current flows through the field winding 2, but both ends of the field 4! This field I electromotive voltage is induced into a waveform by the voltage detector 1G via the discharge resistor 1i9t, and its frequency is determined by the Beyer frequency detection @11 (:, so its phase polarity is determined by the polarity detection!12ζ2 Therefore, it is detected.

When the nine frequencies and polarities are detected and satisfy the -j period input conditions, the gate signal -13 outputs (No. 1) and gives two firing pulses to the gate 4 of the thyristor switch 5. This (=therefore, the sirisk switch 5 is set to 4)!I is started, and the DC output of the rotational regulator aSS is applied to the field windings 2 and 2 to perform DC excitation, and the synchronous motor 3 is driven into synchronous operation (2 times).

However, in the conventional synchronization device shown in Fig. 1 (2), all the complicated electronic circuits from the voltage detector to the gate signal generator are attached to the rotor 1 (2), so the structure of the electronic circuit becomes complicated. 4 = High failure rate of electronic circuits due to vibration, temperature, etc. 4 2 = There were problems with reliability.

The present invention has been made in consideration of the above problems, and includes an electronic circuit necessary for synchronization control on the stator side ζ:
Therefore, it is an object of the present invention to provide a rational synchronization device for a brushless synchronous motor that simplifies the structure of the electronic circuit and improves reliability.

That is, the present invention self-starts to near synchronous speed and excites the field winding of a nine-brushless synchronous motor with direct current via a round rotary transformer and a rotary rectifier split in two above the rotor, thereby producing a brushless synchronous motor. Brushless motor synchronization device for synchronizing the motor (2, on the rotor (
The DC output of the rotary regulator fIL is divided into two parts and the field winding l1
When the optical thyristor switch A42 is turned on and the negative side is divided into the rotor upper and lower sides (the primary side is the stator side C), a field is provided to detect the induced voltage of the field winding. The secondary outputs of the rotary transformer for detecting the auxiliary pressure and the stator all (which is bifurcated) are input to determine synchronization control, and the ignition of the optical thyristor switch is performed. A synchronization determination circuit that generates a signal, a light emitter that converts the ignition signal into an optical signal 1 and emits light, and an optical thyristor switch that is split into two parts on the rotor and receives the optical signal from the stator side. and a light receiver that guides the light to the gate of the synchronous motor.

An embodiment of the present invention is shown in FIG.

The same reference numerals as in FIG. 1 indicate the same functional parts, and their operations are the same as in FIG. 5) Optical Cyrisk Switch 5
When using a human, the running voltage is detected at 1 nI as explained in Figure 1.
O.

All p frequency detector 11. polarity detector 12 and gate)
A signal generator 13 is provided on the stator side 6 to constitute a synchronization determination circuit.

Furthermore, in Fig. 2, a rotating transformer is used to detect the AC induced voltage in the field winding on the stator side! 14. A light emitter 15 that converts the output signal of the gate signal generator 13 into an optical signal 1 and emits light, and a light receiver 16 that receives the optical signal of the emitter 15 and guides it to the gate of the five optical cyrisk switches. has been added.

An example of the arrangement of the emitter 15 and the receiver 16 is shown in FIG. 3C;
show. The projector 15 is attached to the stator side, and the rotor anti-load side shaft 1
The light receiver 1Ti16 guides the optical signal received from the light emitter 15 to the gate of the optical thyristor switch 5A.

In the configuration shown in Figure WN2, when the rotor 1 of the self-starting brushless synchronous motor increases its speed at a synchronous speed, the frequency of the alternating current voltage induced in the field winding 2 decreases. This alternating current induced voltage is transmitted to the voltage detector 10 via the rotating transformer @14.
Detected in Thereafter, in the same manner as in the case of FIG. 1, the synchronization condition is determined by the wave number detection 11 and the polarity detector 12, and the synchronization condition is determined to be 1! i, the gate signal generator 13 generates an output.

The output signal of the gate signal generator 13 is converted into an optical signal by the light projector 15, and the light is projected. The light emitter 15 emits light, and the nine light signals are received by the four-two light receivers 16 as shown in Figure #13, guided to the gates of the five optical thyristor switches, and ignited the five optical thyristor switches.

Therefore, the DC output of the rotary rectifier 8 becomes a field, and the magnetic winding 2
1; A field current is applied and established, and the synchronous motor is synchronized to complete synchronization.

As explained above, (2) according to the present invention, the DC output of the rotary rectifier is applied to the field winding on the b trochanter through the si-risk switch, and the brushless synchronous motor is operated in four ways. In the synchronization device 1, when an optical thyristor is used as a thyristor switch, the AC electromotive voltage of the field winding is taken out to the stator side via a rotary transformer, and the synchronization conditions are set on the stator side. This signal is converted into an optical signal, which fires the optical thyristor switch via the emitter and receiver. Since the structure is simple and reliable, all the electronic circuits can be provided on the stator side, and a brushless synchronous motor can be synchronized at 1!i.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional synchronization device for a brushless synchronous motor, FIG. 2 is a circuit diagram showing an embodiment of a synchronization device for a brushless synchronous motor according to the present invention, and FIG. It is a diagram showing an example of the arrangement of the emitter and receiver in Figure 4. 1...Synchronous motor rotor 2...Field winding 3...Synchronous motor stator 4...Power cutoff Device 5...Thyristor switch 5A...Optical thyristor switch 6...Field ffl! Rotary transformer for power supply ...Voltage detector 11...Slide frequency detector t2...Polarity detector 13...Gate signal generator 14...Rotary transformer for field induced voltage detection 15...Light emitter 16... Photoreceiver (8733) Agent Patent Attorney Yoshiaki Inomata Figure 1

Claims (1)

[Claims] The field winding on the rotor of a brushless synchronous motor that has self-started to near synchronous speed is excited with direct current through a rotary transformer and a rotary rectifier on the rotor; In a synchronization device for a brushless synchronous motor that synchronizes the
lI! An optical thyristor switch that inputs the DC output of the device into the field winding 42, and a negative side 42 installed on the rotor (
a rotary transformer for detecting a field mis electromotive force, the primary side of which is provided on the stator side and detects the alternating current induced voltage of the field winding;
A synchronization determination circuit provided for each stator, which inputs the secondary output of the rotary transformer for detecting the field induced voltage, determines the synchronization condition, and generates a firing signal for the optical Nyristor switch, and the above points. A light emitter that converts an arc signal into an optical signal and emits light; a gate 1 of an iris switch that is provided on the rotor and receives the optical signal from the light emitter and emits the light; and a light receiver that emits the light. Synchronization system for brushless synchronous motor with 9% mold #LO