JP6033133B2 - Engine generator - Google Patents

Description

  The present invention relates to an engine generator, and more particularly to an engine generator that operates by switching a high voltage output operation and a low voltage output operation by adjusting a resistance value of a variable resistor for voltage adjustment.

  Since a portable engine generator must supply power to various loads depending on the installation location, for example, an operation of outputting a high voltage of 200V of three-phase AC used as a power source for a motor or the like; In many cases, the operation of outputting a low voltage of 100 V single-phase AC used as a power source for lighting such as lighting can be switched by changing the connection state of the windings of the synchronous generator ( For example, see Patent Document 1.)

Japanese Patent Laid-Open No. 2001-57664

  On the other hand, by changing the connection state of the output terminal in the three-phase four-wire synchronous generator without changing the connection state of the winding of the synchronous generator, and adjusting the generated voltage of the synchronous generator, 200V The high voltage output of 100 V and the low voltage output of 100 V can be switched. However, when the low voltage output of 100 V is performed, it is necessary to set the power generation voltage of the synchronous generator to 173 V. For this reason, there is a case where it is difficult to reliably output 100 V from the output terminal unless the operator is accustomed to this type of engine generator.

  Therefore, an object of the present invention is to provide an engine generator capable of improving operability when switching between a high voltage output operation and a low voltage output operation.

  In order to achieve the above object, an engine generator according to the present invention includes a three-phase four-wire synchronous generator having an output end (U, V, W) and a neutral point (O), and power generation of the synchronous generator. A voltage automatic regulator that automatically adjusts the voltage to the voltage set by the variable resistor for voltage adjustment, a voltmeter that detects and displays the output voltage, and between the output terminals (U, V), the output terminals (V, W) ), Between the output terminals (U, W), a high voltage output operation that outputs a high voltage, between the output terminal (U) and the neutral point (O), between the output terminal (V) and the neutral point ( O), a low voltage output operation for outputting a low voltage from between the output terminal (W) and the neutral point (O), respectively, by adjusting the resistance value of the voltage adjusting variable resistor An operation mode changeover switch for switching between the high voltage output operation and the low voltage output operation in an engine generator that can be switched. The operation mode changeover switch is linked with a resistance changeover switch for changing the resistance of the circuit connected to the voltage adjusting variable resistor and a voltage measurement circuit changeover switch for changing the circuit connected to the voltmeter. The resistance changeover switch is configured to switch a resistance value of a circuit connected to the voltage adjusting variable resistor between the high voltage output operation and the low voltage output operation, and the voltage measurement circuit changeover switch is The high voltage output operation is switched to a circuit that connects any two output terminals to the voltmeter, and the low voltage output operation is a circuit that connects any one output terminal and a neutral point to the voltmeter. It is characterized by switching.

  Furthermore, the engine generator of the present invention includes a circuit that outputs an auxiliary low-voltage power source from an intermediate position of the winding connected to any one output terminal and the neutral point, and the synchronous generator, The operation mode changeover switch includes an auxiliary low voltage power supply changeover switch that is switched in conjunction with the resistance changeover switch and the voltage measurement circuit changeover switch, and the auxiliary low voltage power supply changeover switch is connected to the auxiliary low voltage power supply during the high voltage output operation. Can be output, and during the low-voltage output operation, the output to the auxiliary low-voltage power supply is cut off.

  The resistance changeover switch is switched to a circuit that inserts a resistor in series with a circuit connected to the voltage adjusting variable resistor during the high voltage output operation, and is switched to the voltage adjusting variable resistor during the low voltage output operation. Switch for switching to a circuit for disconnecting the resistor from a circuit to be connected, or switching to a circuit for disconnecting the resistor from a circuit for connecting to the variable resistor for voltage adjustment during the high-voltage output operation, and adjusting the voltage during the low-voltage output operation One of the switches that switches to a circuit in which a resistor is inserted in series with the circuit connected to the variable resistor for use.

  According to the engine generator of the present invention, when the operation mode changeover switch is switched, a resistor is inserted in series with the voltage adjusting variable resistor or the resistor is disconnected and connected to the voltage adjusting variable resistor. By switching the resistance of the circuit, the set voltage of the automatic voltage regulator can be automatically adjusted to the set voltage for high voltage and low voltage without greatly operating the variable resistor for voltage adjustment. In addition, it is possible to finely adjust the voltage on each of the high voltage side and the low voltage side with a single voltage adjusting variable resistor. Further, by switching the circuit connected to the voltmeter, the display of the voltmeter can be automatically switched between the display for high voltage and the display for low voltage. Therefore, the high voltage output operation and the low voltage output operation can be easily and reliably switched by simply switching the operation mode changeover switch. Further, by shutting off the circuit that outputs the auxiliary low-voltage power supply during the high-voltage output operation during the low-voltage output operation, the output during the low-voltage output operation can be stabilized.

It is a circuit diagram which shows one example of the state at the time of the high voltage output driving | operation in the engine generator of this invention. It is a circuit diagram which similarly shows the state at the time of a low voltage output driving | operation.

  The engine generator shown in this embodiment includes a synchronous generator 11 driven by an engine (not shown). Note that. In the following description, a high voltage is described as a three-phase AC 200V, and a low voltage is described as a single-phase AC 100V.

  The synchronous generator 11 is a three-phase four-wire system in which three armature windings X, Y, and Z are connected in a Y shape to a neutral point O, and each armature winding X, Y, Main output terminals 13u, 13v, 13w, and 13o are connected to the output terminals U, V, and W of Z and the neutral point O through a main power circuit breaker 12, respectively. In addition, an auxiliary terminal U3 for auxiliary low voltage power supply output is provided at an intermediate position of one armature winding X. The auxiliary terminal U3 and the neutral point O are connected to an auxiliary low voltage power supply. Auxiliary output terminals 15u and 15o are connected via the circuit breaker 14.

  Further, the synchronous generator 11 is provided with an automatic voltage regulator (AVR) 17 that automatically adjusts the generated voltage of the synchronous generator 11 to a preset voltage by adjusting the current of the field winding 16. The automatic voltage regulator 17 is provided with a voltage adjusting variable resistor 18 for adjusting the set voltage. In this embodiment, an automatic voltage regulator is used in which the relationship between the resistance value of the voltage adjusting variable resistor and the generated voltage of the synchronous generator is a square proportional relationship or a proportional relationship.

  In the engine generator having such a basic configuration, in this embodiment, there is provided an operation mode changeover switch 24 that can switch the resistance changeover switch 21, the voltage measurement circuit changeover switch 22, and the auxiliary low voltage power supply changeover switch 23 in conjunction with each other. When the operation mode changeover switch 24 is switched to high voltage output operation, that is, operation that outputs three-phase AC 200V, as shown in FIG. 1, the switches 21, 22, and 23 are switched to the high voltage side. When the operation mode changeover switch 24 is switched to the low voltage output operation, that is, the operation of outputting the single-phase 100V, the switches 21, 22, and 23 are switched to the low voltage side as shown in FIG.

  In the high voltage output operation shown in FIG. 1, the resistance changeover switch 21 is switched to a resistance insertion circuit 25a side in which a resistor 25 is inserted in series with a circuit 18a connected to the voltage adjusting variable resistor 18, and the voltage measurement circuit The changeover switch 22 is switched to the circuit 26v side where one voltage measurement circuit 26a connected to the voltmeter 26 is connected to the output terminal V, and the auxiliary low voltage power supply changeover switch 23 is connected to the auxiliary terminal U3 and the neutral point O. The contact 23a provided between the auxiliary low-voltage power supply circuit breaker 14 is closed and switched to a connected state.

  By inserting the resistor 25 in series with the circuit 18 a connected to the voltage adjusting variable resistor 18, the resistance value of the entire circuit passing through the voltage adjusting variable resistor 18 is intermediate between the voltage adjusting variable resistor 18. Since the resistance value is suitable for setting the power generation voltage of the synchronous generator 11 to 200 V at the position, the automatic voltage regulator 17 passes through the output voltage detection circuit 27 without almost adjusting the voltage adjusting variable resistor 18. The current of the field winding 16 is automatically adjusted so that the detected voltage at the output terminals U and W becomes 200V. As a result, AC 200 V is output between the output terminals (U, V), between the output terminals (V, W), and between the output terminals (U, W), and the neutral point O and each of the output terminals U, V, An AC voltage of 115V is output between the auxiliary terminal U3 and the neutral point O, and an AC voltage of 100V is output between the auxiliary terminal U3 and the neutral point O.

  As a result, a three-phase four-wire AC 200V can be supplied from the main output terminals 13u, 13v, 13w, 13o for the power of the motor and the like. Single-phase AC 100V can be supplied from the output terminals 15u, 15o for lighting such as lighting.

  In the voltmeter 26, since the other voltage measuring circuit 26b is always connected to the output terminal U, one voltage measuring circuit 26a connected to the circuit 26v connected to the output terminal V and the other voltage are connected. Since the voltage between the output terminals (U, V), that is, 200 V is measured by the measurement circuit 26b, the display of the voltmeter 26 indicates 200V. Therefore, when the operation mode changeover switch 24 is switched to the high voltage output operation for outputting 200 V, the main output terminal is adjusted by adjusting the voltage adjusting variable resistor 18 so that the display of the voltmeter 26 becomes 200 V. The voltages at 13u, 13v, 13w, and 13o can be adjusted to 200V, and the voltages at the auxiliary output terminals 15u and 15o can be adjusted to 100V, respectively.

  On the other hand, when the operation mode changeover switch 24 is switched to the low voltage output operation, that is, the operation of outputting the single-phase 100 V from the main output terminals 13u, 13v, 13w, 13o, as shown in FIG. Is switched to a state in which the circuit 18a connected to the voltage adjusting variable resistor 18 is connected to a circuit 25b not provided with a resistor, and the voltage measurement circuit switch 22 is one voltage measurement circuit connected to the voltmeter 26. 26a is switched to a circuit 26o connected to the neutral point O, and the auxiliary low voltage power supply changeover switch 23 opens the contact 23a, the auxiliary terminal U3, the neutral point O, the auxiliary low voltage power supply circuit breaker 14, It switches to the state which interrupted.

  By disconnecting the resistor 25 from the circuit 18 a connected to the voltage adjusting variable resistor 18, the resistance value of the entire circuit passing through the voltage adjusting variable resistor 18 is synchronized at an intermediate position of the voltage adjusting variable resistor 18. Since the resistance value is suitable for setting the generated voltage of the generator 11 to 173 V, the automatic voltage regulator 17 detects the output voltage detection circuit 27 through the output voltage detection circuit 27 without adjusting the variable resistor 18 for voltage adjustment. The current of the field winding 16 is automatically adjusted so that the voltages at the output terminals U and W are 173V. Thereby, AC 173V is output between the output terminals (U, V), between the output terminals (V, W), and between the output terminals (U, W), respectively, and between the output terminal U and the neutral point O, A single-phase AC 100V is output between the output terminal V and the neutral point O, and between the output terminal W and the neutral point O, and between the auxiliary terminal U3 and the neutral point O, a single-phase current is output. AC 87V is output.

  Accordingly, by using the main output terminals 13u, 13v, 13w, and 13o in combination, it is possible to supply a single-phase AC of 100V for lighting such as lighting. On the other hand, since the single-phase AC 100V is supplied from each main output terminal, the low voltage output from the auxiliary output terminals 15u and 15o is not necessary. Since the output to the auxiliary output terminals 15u and 15o is cut off even when the low voltage power supply circuit breaker 14 is turned on, the synchronous generator 11 when power is taken out between the auxiliary terminal U3 and the neutral point O The power generation efficiency is not lowered, and the single-phase AC 87V is not mistaken for the single-phase AC 100V. Thereby, the synchronous generator 11 can be operated efficiently, and single-phase alternating current 100V commensurate with the power generation capability of the synchronous generator 11 can be supplied.

  The voltmeter 26 includes an output terminal V and a neutral point by the other voltage measurement circuit 26b always connected to the output terminal U and one voltage measurement circuit 26a connected to the circuit 26o connected to the neutral point O. Since 100V, which is the voltage between the voltmeter and O, is measured, the display of the voltmeter 26 indicates 100V. Therefore, when the operation mode changeover switch 24 is switched to the low voltage output operation for outputting 100V, each main output is adjusted by adjusting the voltage adjusting variable resistor 18 so that the display of the voltmeter 26 becomes 100V. The voltage between the terminals 13u, 13v, 13w and the main output terminal 13o from the neutral point can be adjusted to 100V.

  As described above, when the operation mode is switched between the high voltage and the low voltage, the resistance value of the circuit passing through the voltage adjusting variable resistor 18 of the automatic voltage regulator 17 is switched and the circuit connected to the voltmeter 26 is switched. The output can be easily and reliably set to 200 V or 100 V by slightly adjusting the voltage adjusting variable resistor 18 while observing the display of the voltmeter 26 without greatly operating the voltage adjusting variable resistor 18. be able to. Moreover, the generator 11 can be efficiently operated by cutting off the auxiliary output that is not required at the time of 100 V output.

  For example, when the generated voltage is adjusted only by the voltage adjusting variable resistor 18 without using the resistor 25, when the resistance value of the voltage adjusting variable resistor 18 is 80Ω, the generated voltage becomes 173V, and the resistance value When the generated voltage becomes 200 V when the resistance is set to 100Ω, the voltage adjusting variable resistor 18 must be largely adjusted to 80Ω and 100Ω with the 200V output and the 100V output, but the resistance 25 having a resistance value of 20Ω is required. In addition, when the resistor 25 is disconnected by setting the intermediate resistance value of the voltage adjusting variable resistor 18 to 80Ω, the intermediate resistance value of the voltage adjusting variable resistor 18 corresponds to 100V output. When the resistor 25 is inserted in series, the resistance value corresponds to a 200V output while the voltage adjusting variable resistor 18 is left in an intermediate position. Since the 00Omu, without substantially adjusting the resistance value of the voltage adjusting variable resistor 18, it can correspond to the 200V output and 100V output.

  When an automatic voltage regulator is used in which the relation between the resistance value of the voltage adjusting variable resistor and the generated voltage of the synchronous generator is inversely proportional, the voltage adjusting variable resistor 18 of the automatic voltage regulator 17 is The resistance value of the circuit passing therethrough may be formed to be small in the high voltage output operation and large in the low voltage output operation. Switching to the resistor insertion circuit 25a in which the resistor 25 is inserted in series with the circuit 18a connected to the device 18, and in the high voltage output operation, the resistor 25 may be operated in the reverse direction so as to be connected to the circuit 25b.

  Further, the resistor 25 inserted in series with the voltage adjusting variable resistor 18 may be a variable resistor, and resistors and variable resistors having different resistance values may be provided in both resistor insertion circuits 25a and 25b. Further, in this embodiment, the high voltage output is described as 200 V and the low voltage output is set as 100 V, but the same applies to the relationship between other voltages, for example, 220 V and 110 V.

  DESCRIPTION OF SYMBOLS 11 ... Synchronous generator, 12 ... Main power circuit breaker, 13u, 13v, 13w, 13o ... Main output terminal, 14 ... Auxiliary low voltage power circuit breaker, 15u, 15o ... Auxiliary output terminal, 16 ... Field winding , 17 ... Automatic voltage regulator, 18 ... Variable resistor for voltage regulation, 18a ... Circuit, 21 ... Resistance changeover switch, 22 ... Voltage measurement circuit changeover switch, 23 ... Auxiliary low voltage power supply changeover switch, 23a ... Contact, 24 ... Operation mode changeover switch, 25 ... resistor, 25a ... resistor insertion circuit, 25b ... circuit, 26 ... voltmeter, 26a, 26b ... voltage measurement circuit, 26v ... circuit, 26o ... circuit, 27 ... output voltage detection circuit, O ... medium Sex point, X, Y, Z ... Armature winding, U, V, W ... Output end, U3 ... Auxiliary terminal

Claims (3)

  A three-phase four-wire synchronous generator having an output terminal (U, V, W) and a neutral point (O), and the generated voltage of the synchronous generator are automatically set to a voltage set by a variable resistor for voltage adjustment. Automatic voltage regulator to adjust, voltmeter to detect and display output voltage, high voltage from output terminals (U, V), output terminals (V, W), output terminals (U, W) High voltage output operation, between output terminal (U) and neutral point (O), between output terminal (V) and neutral point (O), output terminal (W) and neutral point (O) In the engine generator that can switch between low voltage output operation for outputting a low voltage from each other by adjusting a resistance value of the voltage adjusting variable resistor, the high voltage output operation and An operation mode changeover switch for switching between the low voltage output operation is provided, and the voltage adjustment is included in the operation mode changeover switch. A resistance changeover switch for switching the resistance of the circuit connected to the variable resistor and a voltage measurement circuit changeover switch for switching the circuit connected to the voltmeter are provided to be able to be switched in conjunction with each other, and the resistance changeover switch includes the high voltage The resistance value of the circuit connected to the variable resistor for voltage adjustment is switched between the output operation and the low voltage output operation, and the voltage measurement circuit changeover switch switches between any two output terminals during the high voltage output operation. The engine generator is switched to a circuit connected to the voltmeter, and any one output end and neutral point is switched to a circuit connected to the voltmeter during the low-voltage output operation.   The synchronous generator includes a circuit that outputs an auxiliary low-voltage power source from an intermediate position of a winding connected to any one output terminal and the neutral point, and the operation mode switch is the resistance switch And an auxiliary low voltage power source changeover switch that is switched in conjunction with the voltage measurement circuit changeover switch, the auxiliary low voltage power source changeover switch is in a state capable of outputting the auxiliary low voltage power source during the high voltage output operation, and the low voltage The engine generator according to claim 1, wherein an output to the auxiliary low-voltage power supply is cut off during an output operation.   The resistance changeover switch switches to a circuit in which a resistor is inserted in series with a circuit connected to the voltage adjustment variable resistor during the high voltage output operation, and is connected to the voltage adjustment variable resistor during the low voltage output operation. A switch for switching to a circuit that disconnects the resistor from a circuit, or a circuit that connects to the variable resistor for voltage adjustment during the high voltage output operation, and a circuit that disconnects the resistor from the circuit connected to the variable resistor for voltage adjustment, and the voltage adjustment variable during the low voltage output operation. 3. The engine generator according to claim 1, wherein the engine generator is one of a switch for switching to a circuit for inserting a resistor in series with a circuit connected to the resistor.

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