JPH0580194U - Motor generator - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a motor generator that has a small starting current and therefore a small amount of heat generation and does not need to consider the power receiving facility capacity at the time of starting. The motor 2 of the motor generator is driven by an inverter 7, and the inverter 7 is controlled so that the starting current of the motor 2 is limited to a predetermined value or less. Therefore, the motor rotation state detector 9 coupled to the motor 2 and the preset value set so that the output value of the detector 9 and the starting current value of the motor 2 do not exceed a predetermined value. And an inverter 7 controlled by the set value, and the inverter 7 output controls the motor.
It is characterized in that the drive unit 2 is driven. It is effective to use a cage type motor for the motor 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a starting method of a motor generator which is driven by a motor and generates a predetermined AC power, and a circuit thereof, and in particular, it is a low limit for limiting a starting current of the motor to a desired value or less. The present invention relates to a motor generator capable of starting electric power.

[0002]

[Prior Art]

 At tarmacs at airports, power is used from the ground for use in aircraft where power generation facilities are stopped. In this case, since the power supply frequency in the aircraft is 400 Hz, for example, a facility for converting the ground power supply frequency of 50/60 Hz into the above 400 Hz is required. As this equipment, a motor generator is arranged at a predetermined position in the parking lot. The conventional motor generator installed in the parking lot has the structure shown in FIG. In FIG. 3, reference numeral 21 is a motor generator, and 10 is an AVR for automatically adjusting the power generation output voltage of this motor generator. In this motor generator 21, reference numeral 12 is an AC generator 3. , 12a is an exciting coil of the synchronous motor 12, and 3a is an exciting coil of the AC generator 3. Illustrations of a motor generator starting device and various electromagnetic contactors are omitted.

Further, in FIG. 3, reference numeral 15 is an exciter for generating exciting currents of the synchronous motor 12 and the AC generator 3 controlled by the AVR 10, and the generated power of the exciter 15 is as described above. It is supplied to the exciting coil 12a of the synchronous motor 12 and the exciting coil 3a of the AC generator 3. The synchronous motor 12 is arranged in the parking lot, receives the AC power supply 6 supplied from the ground, and rotates in synchronization with the frequency of the AC power supply. When the synchronous motor 12 rotates, the AC generator 3 connected to the output shaft of the synchronous motor 12 rotates and outputs a predetermined AC power 4. That is, when the synchronous motor rotates at a rotational speed synchronized with the commercial frequency, the AC generator generates and outputs AC power of a predetermined voltage controlled by the AVR at a predetermined frequency, for example, the frequency 400HZ. The output voltage of the AC generator 3 is detected by the instrument transformer 10a, and the AVR 10 functions to maintain the voltage of the output power 4 at a predetermined value.

[0004]

[Problems to be solved by the device]

 With the recent development of aviation circumstances, it is desired to increase the number of parking lots at each airport, and the expansion of the parking lots inevitably requires the addition of a motor generator for power supply to the aircraft being parked. Is becoming By the way, in the construction of the motor generator as described above, various structures are added to the synchronous motor for starting, and a starting device such as a reactor starting and a condor starter is used. However, depending on the type and starting method of the synchronous motor, a starting current of about 10 times the rated current value may flow, and if it is necessary to add a large number of motor generators, the capacity of the power receiving equipment will increase. Expansion is needed. The condorffer starting method has a lower starting current than the starting reactor, but is more expensive. Therefore, there is a problem that expansion of the power receiving equipment capacity requires a large amount of equipment expansion cost depending on the initial equipment condition. Even in the case of motor generators used at other than airports, if the initial conditions change and it becomes necessary to increase the equipment of motor generators, the same problems as above will occur. Further, since the current value at the time of starting is large, the starting reactors described above need to have large dimensions and become large and heavy, and also an air cooling function is required to reduce heat generation at the time of starting. I am trying. The present invention solves the above problems and provides a starting method for a small and lightweight motor generator that requires a small starting current for the starting device, therefore generates a small amount of heat, and does not need to consider the power receiving facility capacity at the time of starting. It is an object to develop and provide a motor generator having a desired starting characteristic.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, a motor generator according to the present invention drives the motor by an inverter so that the starting current of the motor is limited to a predetermined value or less. To control. In order to realize the above method, a motor rotation status detector coupled to the motor and a preset setting so that the detector output value and the starting current value of the motor do not exceed a predetermined value. It is characterized in that it has a function of comparing with a value and an inverter controlled by the set value, and that the motor is driven by the output of the inverter. It is effective to use a cage type motor for the above motor.

[0006]

[Action]

 Since the motor generator according to the present invention is configured as described above, the starting current of the motor generator can be limited to a desired current value or less, and the motor generator including the starting device is also provided. The function can be made compact and lightweight. Further, when a squirrel-cage type motor is used as the motor of the motor generator, the equipment cost becomes low while stably outputting the desired frequency.

[0007]

【Example】

 Next, the configuration of the motor generator based on this invention will be described with reference to the drawings. FIG. 1 corresponds to a motor generator of the type described with reference to FIG. 3 in the prior art, and the same reference numerals are used for the same devices, which are directly necessary for explaining the configuration of the present invention. Illustrations of auxiliary equipment of various motor generators and various magnetic contactors are omitted. In FIG. 1, reference numeral 1 denotes a motor generator to which the present invention is applied, and a ground power source 6 on which the motor generator 1 is installed, for example, a three-phase 50 Hz or a three-phase 60 Hz 440v inverter. I am typing in 7. The ground power source 6 is rectified in the case of an alternating current of a commercial frequency and then converted into an alternating current of a frequency, the details of which will be described later, in this inverter, and is supplied to a cage type motor (hereinafter abbreviated as a motor) 2. Has been done. The output shaft of the motor 2 is connected to the input shaft of an AC generator (hereinafter referred to as a generator) 3, and a rotation speed sensor (hereinafter referred to as a sensor) 9 and an excitation coil of the generator 3 are connected. It is also connected to an exciter 5 for generating an exciting current supplied to the coil 3a. When connecting the above-mentioned respective shafts, a rotation transmission mechanism (not shown) having a predetermined gear ratio is inserted and equipped if necessary.

The rotation speed of the motor output shaft detected by the sensor 9 is input to the rotation control device 8, and the rotation control device 8 operates the inverter 7 by an output signal according to a preset control condition. To control. The exciter 5 is supplied with the output from the AVR 10, which controls the voltage of the output power 4 of the motor generator 1, to the exciting coil 11, and is controlled by the AVR 10. In the AVR 10, the voltage of the output 4 is detected and input by the voltage transformer 10a to automatically adjust the exciting coil current of the exciter-5. Therefore, the generator 3 stably outputs a predetermined voltage at a predetermined frequency, for example, three-phase 400 Hz, for example, 115v or 200v. In FIG. 1, reference numeral 12 indicates an operation adjusting device such as an operation panel for operating the motor generator 1.

In the above-described device configuration, the rotation speed signal of the motor output shaft detected by the sensor 9 is input to the rotation control device 8, and the output signal according to the preset control condition is used to output the inverter signal. An example of the function of the rotation control device 8 at the time of starting for controlling the operation of the actuator 7 will be described with reference to FIG. In FIG. 2, the rotation speed of the motor 2 detected by the sensor 9 is input to the comparison function 8c. Reference numeral 8a is a timing pulse generation function, and reference numeral 8b is a storage function. The address of the storage function 8b is sequentially switched for each pulse of the timing pulse, and a predetermined value corresponding to the time transition after the start operation recorded in the address is specified. The rotational speed value of the motor is read and input to the comparison function 8c. The comparison function 8c compares the output of the sensor 9 with the rotation speed of the motor read from the storage function 8b, and inputs the deviation speed value obtained as a result of the comparison to the inverter control signal generation function 8d. Control the output frequency of

As described above, in the rotation control device 8, when the motor 2 is started in advance with no load on the generator of the motor generator, the starting current of the motor 2 does not exceed the predetermined value. The command transition value of the inverter output frequency corresponding to the lapse of time after the start operation that defines the rotation speed of the motor 2 is recorded as a digital value so that the motor rotation is increased by the characteristic. A cable for supplying the output power 4 of the motor generator 1 is connected to a predetermined load device to which power is supplied, for example, a receptacle of an aircraft, and then the operation control device 13 is operated by a control panel (not shown). When the starting operation of the tagenator 1 is performed, the rotation control device 8 controls the inverter 7 according to the recorded command transition value. Therefore, the electric power input from the ground power source 6 by the inverter 7 is converted into a predetermined frequency as time passes and is supplied to the motor 2. The motor 2 starts starting at the above frequency and drives the generator 3. For example, the sensor 9 is formed by a pulse encoder, and the output signal from the sensor 9 which outputs a pulse train having a frequency proportional to the rotation speed of the motor 2 is input to the rotation control device 8 to rotate the motor. The rotation speed of the motor, which is calculated from the number of time pulses of the pulse train signal indicating the speed, is compared with the predetermined rotation speed value of the motor set corresponding to the time elapsed after the preset starting operation, While correcting the rotational speed deviation amount, the output frequency of the inverter is adjusted so that the rotational speed of the motor 2 rises to a rotational state in which the generator 3 generates a predetermined frequency as time passes. To raise. The exciter 5 supplies an exciting coil current to the exciting coil 3a of the generator 3 under preset conditions in response to the increase in the rotation speed of the motor 2.

After the start-up is completed, the rotation control device 8 controls the output signal of the sensor 9 to properly maintain the power generation frequency of the generator 3 at a predetermined frequency, for example, three-phase 400 Hz, as described above. Further, the AVR 10 operates so that the output voltage value detected by the instrument transformer 10a becomes constant, and controls the output voltage value so that the output voltage value is properly maintained at a set value of 115v or 200v, for example. When the generator 3 enters a predetermined power generation state, an electromagnetic contactor (not shown) is automatically turned on to start power supply to a load power facility, such as an aircraft, and after the power supply is started, the power generation frequency of the generator 3 is It is correctly maintained by the sensor 9, the rotation control device 8 and the inverter 7. The generated voltage of the generator 3 is correctly maintained by the instrument transformer 10a, the AVR 10, the exciter 5, and the exciting coil 3a.

In the above description, the pulse encoder is used for the sensor 9 and the rotation control device 8 is operated digitally. However, the accuracy of the power generation frequency of the generator 2 and the like can be improved by this motor generator. Depending on the conditions, a speed generator is used for the sensor 9, and the analog control by means such as recording the set value of the motor rotation speed corresponding to the passage of time as an analog value approximated by a broken line is also used. Good. Further, when a resolver is used for the sensor 9, the rotation control device 8 can be dealt with by appropriately configuring the output of the resolver. Further, the analog control and the digital control may be appropriately combined and combined. Further, in the above description, the feedback control using the signal from the sensor 9 is performed even at the time of starting the motor generator, but depending on the conditions at the time of starting, the load after starting may be changed. The feedback function may be utilized to maintain the power generation frequency accuracy only when power is supplied to the power facility. Also, in the above description, the case of using the squirrel-cage motor as the motor has been described, but depending on the conditions, the synchronous motor is used as the motor to remove the feedback loop. You may do it. Also, the value of the current supplied from the ground power source 6 may be measured and the inverter output may be controlled so that the current value does not exceed a predetermined value at the time of starting. Besides, according to the technical idea of the present invention, the configuration of the motor generator shown in the above description can be applied and modified so as to be appropriately set in accordance with the load power equipment, the ground power equipment and environmental conditions.

[0013]

[Effect of the device]

 As described above, according to this invention, the following excellent effects can be obtained. The starting current of the motor generator can be limited to a desired current value or less. The motor control equipment including the starter can be made compact and lightweight. When a squirrel-cage motor is used as the motor, there are few failures and the equipment is simple and inexpensive.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a motor generator according to the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a starting characteristic control function of a motor generator according to the present invention.

FIG. 3 is a block diagram showing a schematic configuration of a conventional motor generator.

[Explanation of symbols]

 1 Motor Generator 2 Motor (Cage Type Motor) 3 Generator 7 Inverter 8 Rotation Control Device

Claims (3)

[Scope of utility model registration request] 1. In a motor generator driven by a motor to generate a predetermined AC power, the motor is driven by an inverter and the starting current of the motor is limited to a predetermined value or less. A motor generator characterized in that the inverter is controlled so as to operate. 2. In a motor generator which is driven by a motor and generates a predetermined AC power, a motor rotation status detector coupled to the motor, an output value of the detector, and the motor. -A setting function that presets the starting current value of the battery so that it does not exceed a predetermined value, a comparing function between the setting function setting value and the detector output value, and an inverter controlled by the output of the comparing function. And a motor for driving the motor by the output of the inverter. 3. The motor generator according to claim 2, wherein the motor is a cage type motor.