JP3140121U - Motor generator with smooth start function - Google Patents

Abstract

The present invention provides a motor generator that reduces the burden on an electric motor at the time of starting the apparatus and smoothly starts the apparatus.
In a motor generator that connects a rotating shaft of an electric motor and an electric generator to generate electric power by rotating the electric generator by the electric motor, the electric motor is provided between the rotating shafts of the electric motor and the electric generator. Clutch mechanisms 1d to 1h for connecting and disconnecting the flywheels 1e and 1g, a switch circuit 1j for connecting and disconnecting the load circuit connected to the generator 1i and the generator output, and starting of the motor 1c A control circuit 1L is provided which transmits a connection command signal to each clutch mechanism at a predetermined time interval and further transmits a connection command signal to the switch circuit 1j. Further, a configuration may be provided in which a power storage circuit 3s that stores part of the output power of the generator 1i and a power feedback circuit 3t that feeds back the stored power to the selective supply circuit 1a.
[Selection] Figure 3

Description

  The present invention relates to a motor generator that generates electric energy by rotating a generator with an electric motor. More specifically, the present invention reduces the load on the motor at the time of starting the apparatus and smoothly starts the motor. The present invention relates to a squeezing motor generator.

  A so-called motor generator that takes out a generator output by rotating a generator with an electric motor is widely used because it can easily extract electric power energy in a form different from electric power on the input side. Many inventions and devices as disclosed in Document 1 and Patent Document 2 are disclosed.

JP 2001-178195 A Japanese Utility Model Publication No. 2-091484

  However, the starting torque required when the generator in a stationary state is rotated and started is an extremely large value compared to the driving torque required when the generator is rotating. For this reason, in order to generate such a starting torque, at the time of starting the motor generator, the starting current flowing through the motor driving the generator must be a large current. Therefore, it is necessary to design the power supply facility for the electric motor in response to the starting current, which has been a factor in increasing the size and cost of the equipment.

  Further, at the time of starting the motor, such a starting current flows into the armature winding or the field winding of the motor as a so-called inrush current. In general, such an inrush current has an adverse effect on the motor, reduces its life and reliability, and in turn reduces the MTBF (mean time between failures) of the motor in the motor generator.

  On the other hand, it is a well-known fact that the driving torque required for the rotation of the generator varies depending on the magnitude of the electrical load connected to the output of the generator. For example, an electrical load close to the output rating of the generator When is connected, a much larger driving torque is required as compared with a case where a load is hardly connected to the generator.

  Therefore, if a large-capacity electrical load is connected to the output side of the generator when the motor generator is started, the above inrush current becomes a larger value, and the burden on the motor driving the generator further increases. This will have a further adverse effect on the performance and reliability.

The present invention aims to solve such a conventional problem. More specifically, the present invention reduces the burden on the motor at the time of start-up and makes the start-up smooth. An object is to provide an apparatus.

  In order to achieve the above object, a motor generator according to a first aspect of the present invention connects a rotating shaft of a motor and a rotating shaft of a generator to each other, and drives the generator to rotate by the motor. In the motor generator that performs the above-described operation, a clutch mechanism that connects and disconnects the rotating shafts of the motor and the generator according to a predetermined clutch command signal, and a motor that generates power to the generator according to a predetermined switch command signal. A switch circuit for connecting and disconnecting the connected load circuit and the generator output; and, after starting the electric motor, transmitting a connection command signal to the clutch mechanism at a predetermined time interval; And a control circuit for transmitting a connection command signal to the circuit.

  Therefore, according to such a configuration, when the motor generator is started, first, only the motor is started first, and then the motor and the rotating shaft of the generator are connected at a predetermined time interval. It is possible to connect the load circuit to the output in time series.

  The motor generator according to a second aspect of the present invention is the motor generator according to the first aspect, wherein the motor and the rotating shaft of the generator are connected to each other via at least one flywheel. The flywheel clutch mechanism further includes at least one flywheel clutch mechanism for connecting and disconnecting the flywheel and the rotary shaft in response to the flywheel clutch command signal. The articulation command signal is transmitted to the flywheel clutch mechanism with a time interval of.

  Therefore, according to such a configuration, the kinetic energy output from the motor after the motor is started can be temporarily stored as kinetic energy for rotating the flywheel (flywheel), and a predetermined time has elapsed since the motor was started. When the generator is started later, such kinetic energy can be used in addition to the rotational torque from the electric motor.

  According to a third aspect of the present invention, there is provided a motor generator according to the first or second aspect, wherein a power storage circuit that stores a part of the output power of the generator, and a power stored in the power storage circuit. And a power feedback circuit for returning a part to the power supply system to the electric motor.

  Therefore, according to such a configuration, a part of the output power of the generator is stored in the power storage circuit in the motor generator, and the stored power is fed back as input power to the motor at a predetermined timing and reused. Can do.

  According to the present invention, since the mechanical or electrical load applied to the motor that drives the generator is increased step by step when the motor generator is started up, it is possible to reduce the burden on the motor. Can be started smoothly. In addition, the energy from the motor is converted into kinetic energy generated by the rotation of the flywheel and stored, and this is used as a part of the starting torque when starting the generator. Thus, it is possible to further facilitate the startup of the motor generator. Moreover, energy utilization efficiency can be further increased by storing a part of the output power of the generator, returning it to the input side, and reusing it as input power of the motor.

  Hereinafter, a plurality of examples as the best mode for carrying out the present invention will be described with reference to the accompanying drawings.

First, Example 1 of the motor generator which is one embodiment of the present invention will be described.
The configuration of the motor generator 1 according to the first embodiment is shown in the block diagram of FIG. In the figure, the power supply selection circuit 1a selects, for example, power output from various power supply sources (not shown) such as a commercial power supply circuit, a solar power generation circuit, or a wind power generation circuit, It is a circuit supplied to the electric motor 1c.

  Incidentally, as a commercial power supply circuit used for the present apparatus, for example, a configuration using a normal single-phase AC power supply with AC 100 V or a configuration using a AC 200 V three-phase AC power source may be used. It is assumed that input power from the commercial power supply circuit is supplied to the power supply selection circuit 1a through a predetermined rectifier circuit (not shown).

  In the embodiment of FIG. 1, the power supply selection circuit 1a is represented as a so-called backflow prevention circuit using a normal diode array, but this embodiment is not limited to such a case. For example, the output voltage from each power supply system is detected, and each power supply system is controlled to open and close using a power control semiconductor such as IGBT or triac according to the detection result, and the power supplied to the motor 1c is selected. It is good also as a structure.

  The switch circuit 1b is a switch circuit that connects the output of the power supply selection circuit 1a to the electric motor 1c, and is configured by, for example, an electromagnetic relay or a semiconductor for power control. The switch circuit 1b is opened and closed (on / off) based on a predetermined command signal from the control circuit 1L described later.

  The motor 1c is a DC motor and is driven to rotate by the power supplied from the power supply selection circuit 1a via the switch circuit 1b. In the case where the electric motor 1c is driven by a single supply power from the commercial power supply circuit as in a second embodiment described later, an AC electric motor can be used as the electric motor 1c.

  The clutch mechanism 1d is, for example, an electromagnetically operated clutch whose clutch plate is disengaged by an electromagnetic solenoid, and is a clutch mechanism that controls connection / disconnection of the rotating shaft of the electric motor 1c and the rotating shaft of the flywheel 1e. The clutch mechanism 1d is connected and disconnected according to a predetermined command signal from the control circuit 1L.

  The flywheel 1e is a so-called “flying wheel” in which a disk having a large mass is supported by a low-friction bearing, a ball bearing, or the like (both not shown). The flywheel 1e can store the electric energy applied to the electric motor 1c as rotational kinetic energy by using the kinetic inertia of the large mass disk.

  The clutch mechanism 1f is a clutch mechanism that controls the connection or disconnection of the rotating shafts of the flywheel 1e and the subsequent flywheel 1g. This is done by a predetermined command signal from.

  Like the flywheel 1e, the flywheel 1g is a "flywheel" in which a disk having a very large mass is supported by a low-friction bearing, a ball bearing, or the like (both not shown). If the mass of the flywheel 1e is m1 and the mass of the flywheel 1g is m2, a relationship of m1 <m2 is defined in this embodiment.

  The clutch mechanism 1h is a clutch mechanism that controls connection / disconnection between the flywheel 1g and the rotating shaft of the generator 1i. The clutch mechanism 1h is the same as each clutch mechanism described above, and thus the description thereof is omitted. Needless to say, the connecting / disconnecting operation of the clutch mechanism 1h is performed by a predetermined command signal from the control circuit 1L.

  The generator 1i is an AC or DC generator that is rotationally driven by the electric motor 1c via the above-described flywheel 1e and 1g. Incidentally, it is preferable to use a single-phase or three-phase AC generator as the generator 1i if the purpose is to supply power to a normal power receiving facility in a facility such as a factory.

  The switch circuit 1j is a switch circuit for connecting the power generation output of the generator 1i to the load circuit 1k in the subsequent stage, and a large electromagnetic relay or a circuit breaker is used from the relationship of opening / closing a large amount of power. preferable. Needless to say, opening / closing (ON / OFF) of the switch circuit 1j is performed by a predetermined command signal from the control circuit 1L. The load circuit 1k is a power receiving facility that receives supply of power from the switch circuit 1j.

  The control circuit 1L is a control center composed of a microprocessor, various digital / analog circuits, a memory circuit (none of which is shown), and controls and controls the operation of each part of the motor generator 1. Is. As described above, a predetermined command signal is transmitted from the control circuit 1L to each clutch mechanism and each switch circuit.

  Next, the operation of the motor generator 1 according to the first embodiment will be described with reference to the time chart shown in FIG.

  When a start switch (not shown) of the motor generator 1 is pressed by an operator or the like, first, the control circuit 1L transmits an ON command signal to the switch circuit 1b to close the switch and select the power supply. Supply of electric power from the circuit 1a to the electric motor 1c is started (at time T0 shown in the time chart of FIG. 1).

  At this time, since the clutch mechanism 1d is connected and disconnected, no mechanical load is connected to the rotating shaft of the electric motor 1c, and the starting torque of the electric motor 1c becomes a very small value. Therefore, the electric motor 1c can start rotating smoothly, and the peak value of the starting current of the electric motor 1c can be suppressed.

  Thereafter, when the time T1 elapses, the control circuit 1L transmits a clutch connection signal to the clutch mechanism 1d to connect the clutch. Thereby, the flywheel 1e is connected to the rotating shaft of the electric motor 1c, and the rotation of the flywheel 1e is started.

  In this case, since the time T1 has already elapsed since the start of the electric motor 1c, sufficient rotational kinetic energy is accumulated in the armature including the rotating shaft of the electric motor 1c. Therefore, even if the flywheel 1e is connected to the rotating shaft of the electric motor 1c, the burden on the electric motor 1c is much smaller than when the electric motor 1c is started with the flywheel 1e connected.

  When time T2 elapses after the flywheel 1e is connected, the control circuit 1L transmits a clutch connection signal to the clutch mechanism 1f to connect the clutch. As a result, the flywheel 1g is connected to the rotation shaft of the flywheel 1e, and the rotation of the flywheel 1g is started.

  In this case, time (T2-T1) has elapsed since the start of rotation of the flywheel 1e, and sufficient rotational kinetic energy is accumulated in the flywheel 1e. Therefore, even when the flywheel 1g having a mass larger than that of the flywheel 1e is started to rotate, the burden on the electric motor 1c can be suppressed by using the rotational kinetic energy accumulated in the flywheel 1e.

  Thereafter, when the time T3 further elapses, the control circuit 1L transmits a clutch connection signal to the clutch mechanism 1h to connect the clutch. Thereby, the rotation shaft of the generator 1i is connected to the rotation shaft of the flywheel 1g, and the rotation of the generator 1i is started. Also in this case, time (T3-T2) has already elapsed since the start of rotation of the flywheel 1g, and sufficiently large rotational kinetic energy is accumulated in the flywheel 1g. Therefore, the generator 1i can be started smoothly by using the rotational kinetic energy accumulated in the flywheel 1g.

  Further, when the generator 1i is started (at time T3), since the output of the generator 1i is cut off from the load circuit by the switch circuit 2, the start required for starting the generator 1i is required. The torque becomes a smaller value, which helps to start the rotation very smoothly.

  Thereafter, when the time T4 further elapses, the control circuit 1L transmits an ON command signal to the switch circuit 1j, closes the switch, and connects the load circuit 1k to the output of the generator 1i. As a result, the torque required for the rotation of the generator 1i increases, but sufficient rotational kinetic energy is accumulated in the above-described armature including the flywheels 1e and 1g and the rotating shaft of the generator 1i. The output power can be smoothly taken out from the generator 1i without imposing an excessive burden on the generator.

  In addition, about the length of time T1-T4, it is possible to set arbitrarily in the timer circuit (not shown) incorporated in the control circuit 1L, and according to the embodiment of the actual motor generator 1 For example, it can be variably adjusted individually and freely in the range of 1 second to several seconds.

  As described above, the motor generator 1 according to the first embodiment has a configuration in which the mechanical and electrical loads applied to the motor 1c that drives the generator 1i with a predetermined time difference are sequentially increased. ing. Therefore, it is possible to perform the startup process of the motor generator 1 extremely smoothly without imposing an unreasonable burden on the motor 1c.

  In the above embodiment, the case where two flywheels 1e and 1g are used has been described. However, the embodiment of the present invention is not limited to this example. For example, between the motor 1c and the generator 1i. The number of flywheels installed in the vehicle may be increased, or the flywheel may be omitted.

  Next, Example 2 which is another embodiment of the present invention will be described. Since the motor generator 2 according to the second embodiment has the same basic configuration as the motor generator 1 according to the first embodiment, the same components as those in the first embodiment are the same as those in FIG. The description is omitted by attaching the reference numerals.

  First, the configuration of the motor generator 2 according to the second embodiment is shown in the block diagram of FIG. Incidentally, the component added in the second embodiment is the clutch mechanism 2m. Since the clutch mechanism is the same as that of the first embodiment, the description thereof is omitted.

  The present embodiment is a case in which the motor generator is driven by using low-cost nighttime power. In such a case, the power supplied to the motor 1c is only AC power from the commercial power supply circuit. Therefore, for example, a low-cost AC motor such as a single-phase or three-phase induction motor can be used as the motor 1c. In this embodiment, the flywheel installed between the electric motor 1c and the generator 1i is omitted in order to simplify the entire apparatus.

  The operation of the motor generator 2 according to the second embodiment is as shown in the time chart of FIG. That is, when a start switch (not shown) of the motor generator 2 is pressed by an operator or the like, first, the control circuit 1L transmits an ON command signal to the switch circuit 1b to close the switch, Supply of electric power from the power supply circuit to the electric motor 1c is started (at time T0 shown in the time chart of FIG. 2).

  At this time, since the clutch mechanism 2m is separated, no mechanical load is connected to the rotating shaft of the electric motor 1c, and the starting torque of the electric motor 1c becomes a very small value. Therefore, the electric motor 1c can start rotating smoothly, and the peak value of the starting current of the electric motor 1c can be suppressed.

  Thereafter, when the time T1 elapses, the control circuit 1L transmits a clutch connection signal to the clutch mechanism 2m to connect the clutch. Thereby, the rotating shaft of the generator 1i is connected to the rotating shaft of the electric motor 1c, and the rotation of the generator 1i is started. In this case, since the time T1 has already elapsed since the start of the electric motor 1c, sufficient rotational kinetic energy is accumulated in the armature including the rotating shaft of the electric motor 1c. Therefore, even if the generator 1i is connected to the rotating shaft of the electric motor 1c, the burden on the electric motor 1c is much smaller than when the electric motor 1c is started with the generator 1i connected.

  Further, when the generator 1 i is activated (at time T 1), the output of the generator 1 i is cut off from the load circuit by the switch circuit 2. Therefore, the starting torque required for starting the generator 1i becomes a smaller value, which helps to start the rotation very smoothly.

  Thereafter, when the time T2 further elapses, the control circuit 1L transmits an ON command signal to the switch circuit 1j, closes the switch, and connects the load circuit 1k to the output of the generator 1i. As a result, the torque required for the rotation of the generator 1i increases, but sufficient rotational kinetic energy is accumulated in the armature including the rotating shaft of the generator 1i, so that an excessive burden is not imposed on the motor 1c. The output power can be smoothly taken out from the generator 1i.

  As in the case of the first embodiment, the motor generator 2 according to the second embodiment also employs a configuration in which mechanical and electrical loads applied to the motor 1c are sequentially increased with a predetermined time difference. The motor generator 2 can be activated very smoothly without imposing an unreasonable burden on the motor 1c.

  Next, Example 3 which is another embodiment of the present invention will be described. In addition, since the motor generator 3 according to the third embodiment has the same basic configuration as the motor generator 1 according to the first embodiment, the same components as those in the first embodiment are the same as those in FIG. The description is omitted by attaching the reference numerals.

  First, the configuration of the motor generator 3 according to the third embodiment is shown in the block diagram of FIG. The components added in the third embodiment are a power distribution circuit 3q, a rectifier circuit 3r, a power storage circuit 3s, and a power feedback circuit 3t.

  The power distribution circuit 3q is a branch circuit that branches a part of the output power from the generator 1i from the load circuit 1k. The rectifier circuit 3r is a full-wave rectifier circuit for rectifying the AC power output from the power distribution circuit 3q, and includes, for example, a bridge circuit in which a diode, a thyristor, or the like is combined.

  The storage circuit 3s is a storage circuit for storing the DC power output from the rectifier circuit 3r as electric energy. The storage circuit 3s may be configured by a battery circuit in which a predetermined number of ordinary batteries are combined in series or in parallel, or may be configured by combining an electric double layer capacitor characterized by a large capacity.

  The power feedback circuit 3t is a power switching circuit using, for example, a power control transistor such as an IGBT, and the electrical energy stored in the power storage circuit 3s according to a predetermined control signal is provided on the power input side of the apparatus. The power supply selection circuit 1a is fed back.

  The processing operation at the time of starting the motor generator 3 according to the third embodiment is as shown in the time chart of FIG.

  In the motor generator 3 according to the third embodiment, when there is a margin in the output power from the generator 1i, a part of the output power is extracted by the power distribution circuit 3q, rectified, and then supplied to the storage circuit 3s as electric energy. accumulate. Then, by returning this to the electric motor 1c at a predetermined timing, it is possible to reuse the generated energy and increase the efficiency of the motor generator 3 as a whole.

  The embodiments of the present invention are not limited to the embodiments described above. For example, the shape and arrangement of each part constituting each embodiment, the material thereof, etc. It goes without saying that changes can be made as appropriate according to actual embodiments without departing.

The configuration of the present invention described above can be used in a small-scale power generation system that generates electric power energy by rotating a generator with an electric motor.

It is the block diagram and time chart which show the structure of the motor generator 1 which is 1st Example of this invention. It is the block diagram and time chart which show the structure of the motor generator 2 which is 2nd Example of this invention. It is a block diagram which shows the structure of the motor generator 3 which is the 3rd Example of this invention.

Explanation of symbols

1, 2 and 3 ... Motor generator 1a ... Power supply selection circuit 1b, 1j ... Switch circuit 1c ... Motor 1d, 1f, 1h ... Clutch mechanism 1e, 1g ... Flywheel 1i ... Generator 1k ... Load circuit 1L ... Control circuit 2m ... Clutch mechanism 3q ... Power distribution circuit 3r ... Rectifier circuit 3s ... Power storage circuit 3t ... Power feedback circuit

Claims (3)

In the motor generator for generating power by connecting the rotating shaft of the electric motor and the rotating shaft of the generator to each other, and rotating the generator by the electric motor,
A clutch mechanism for connecting and disconnecting the rotating shaft of the electric motor and the generator in response to a predetermined clutch command signal;
A switch circuit that connects and disconnects the load circuit connected to the generator and the generator output in response to a predetermined switch command signal;
A control circuit for transmitting a connection command signal to the clutch mechanism at a predetermined time interval after starting the motor, and further transmitting a connection command signal to the switch circuit; Motor generator to do. The rotating shafts of the electric motor and the generator are connected to each other via at least one flywheel,
And further including at least one flywheel clutch mechanism for connecting and disconnecting the flywheel and the rotating shaft in response to a predetermined flywheel clutch command signal,
2. The motor generator according to claim 1, wherein the control circuit transmits an articulation command signal to the flywheel clutch mechanism at a predetermined time interval after the motor is started. A power storage circuit that stores a part of the output power of the generator; and a power feedback circuit that feeds back a part of the power stored in the power storage circuit to a power supply system to the motor. The motor generator according to claim 1 or 2.

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