CN110855190A - Motor control method, device and motor system - Google Patents
Motor control method, device and motor system Download PDFInfo
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- CN110855190A CN110855190A CN201911167608.2A CN201911167608A CN110855190A CN 110855190 A CN110855190 A CN 110855190A CN 201911167608 A CN201911167608 A CN 201911167608A CN 110855190 A CN110855190 A CN 110855190A
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- 230000008569 process Effects 0.000 claims abstract description 29
- 230000004044 response Effects 0.000 claims abstract description 10
- 238000004146 energy storage Methods 0.000 claims description 108
- 230000007246 mechanism Effects 0.000 claims description 32
- 238000004590 computer program Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 3
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- 238000006243 chemical reaction Methods 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details of starting control
- H02P1/04—Means for controlling progress of starting sequence in dependence upon time or upon current, speed, or other motor parameter
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- Control Of Electric Motors In General (AREA)
Abstract
The invention discloses a motor control method, a motor control device and a motor system. Wherein, the method comprises the following steps: responding to a stop command, and storing energy according to the stop process of the motor; in response to a start command, the stored energy is released to provide an initial speed for the motor. The invention can effectively reduce the impact current when the motor is started by utilizing the stored energy, shortens the starting time, reduces the energy required by starting, and has lower cost and small occupied space.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a motor control method, a motor control device and a motor system.
Background
When the motor is started directly, more or less impact is generated on the power grid, and the impact is larger as the power of the motor is increased. The impact is intuitively expressed as network pressure drop, which is likely to directly cause the shutdown of nearby equipment and even threaten the life and property safety of users.
At present, for a high-power motor, the following method is generally adopted for starting so as to effectively reduce or even avoid current impact when the motor is started.
(1) Although the open star-delta starting can reduce the current impact when the motor is started, the open star-delta starting has secondary impact current which is much larger than the primary impact current.
(2) Closed star triangle starts, and this mode is the improvement on open star triangle starts the basis, through increasing excessive resistance, can effectually reduce secondary impulse current, but because excessive resistance volume is huge, directly leads to the starting cabinet body to occupy very big space.
(3) The soft starter is started by three groups of thyristors and a group of bypass contactors, can provide starting modes such as voltage ramp starting, current-limiting starting, kick starting and the like, and can reduce current impact during starting, but has high manufacturing cost.
(4) The frequency conversion starts, commutates earlier, the contravariant, controls output voltage and frequency through the switching frequency of control transistor, and the impact current when the motor starts has been fine avoided to this kind of mode, but can produce a large amount of harmonics, and along with switching frequency's increase, the harmonic volume of production also can increase moreover to the cost of frequency conversion start is also very high.
Aiming at the problems of high cost and large occupied space required for reducing the impact current when the motor is started in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a motor control method, a motor control device and a motor system, and aims to solve the problems of high cost and large occupied space required for reducing impact current during starting of a motor in the prior art.
In order to solve the above technical problem, an embodiment of the present invention provides a motor control method, including: responding to a stop command, and storing energy according to the stop process of the motor; in response to a start command, the stored energy is released to provide an initial speed for the motor.
Optionally, storing energy according to a motor shutdown process, comprising: and storing the set energy in the motor stopping process by using an energy storage mechanism.
Optionally, the storing the set energy in the stopping process of the motor by using an energy storage mechanism includes: reading the preset energy storage size and/or energy storage duration; and controlling the energy storage mechanism to store energy according to the energy storage size and/or the energy storage duration.
Optionally, in response to a start command, releasing the stored energy to provide an initial speed for the motor, comprising: detecting the starting instruction; acquiring an energy storage identifier; and controlling the starting of the motor according to the energy storage identifier.
Optionally, controlling the starting of the motor according to the energy storage identifier includes: if the energy storage identification is not stored, determining that the motor is started for the first time, and storing energy according to the control operation of a user; after the energy storage is finished, executing the starting operation of the motor, and releasing the stored energy to provide an initial speed for the motor; and if the energy storage identifier is stored energy, directly releasing the stored energy to provide an initial speed for the motor.
An embodiment of the present invention further provides a motor control device, including: the energy storage module is used for responding to the stop command and storing energy according to the stop process of the motor; and the energy release module is used for responding to a starting instruction and releasing the stored energy to provide an initial speed for the motor.
Optionally, the energy storage module comprises: and the energy storage unit is used for storing the set energy in the motor stopping process by using the energy storage mechanism.
An embodiment of the present invention further provides a motor system, including: the motor control device comprises a motor, an energy storage mechanism connected with the motor and the motor control device of the embodiment of the invention, wherein the motor control device is connected with the energy storage mechanism.
Optionally, the motor system further includes: and the power supply module is connected with the motor control device and used for supplying power to the motor control device.
Embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method according to the embodiments of the present invention.
By applying the technical scheme of the invention, the energy generated in the stopping process of the motor is stored, and the stored energy is released to provide the initial speed for the motor when the motor is started, so that the impact current during starting is effectively reduced, the starting time of the motor is correspondingly shortened because the motor obtains the initial speed, and the energy required by starting is correspondingly reduced. Compared with starting modes such as an open star triangle, a closed star triangle, a soft start and a variable frequency start, the mechanism for storing energy enables the cost of the motor starting cabinet to be lower and the occupied space to be less.
Drawings
Fig. 1 is a flowchart of a motor control method according to an embodiment of the present invention;
fig. 2 is a block diagram showing a configuration of a motor control device according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a motor system provided in a third embodiment of the present invention;
fig. 4 is an alternative flowchart of a motor control method according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The present embodiment provides a motor control method that can be applied to a case where a rush current at the time of starting a motor is reduced. Fig. 1 is a flowchart of a motor control method according to an embodiment of the present invention, and as shown in fig. 1, the method includes the following steps:
and S101, responding to the stop command, and storing energy according to the stop process of the motor.
And S102, in response to the starting command, releasing the stored energy to provide an initial speed for the motor.
When the motor is directly started, the initial speed is zero, and the speed is from zero to zero, so that a large impact current is generated. In the embodiment, the stored energy is utilized, and the energy is released to provide the initial speed for the motor when the motor is started, so that the motor is started at a certain initial speed, and after the initial speed is obtained, the starting time of the motor is correspondingly shortened under the action of the same voltage; and because the motor obtains certain kinetic energy after having initial speed, known from the law of conservation of energy, the energy required for starting the motor can be correspondingly reduced, so that the impact current when the motor is started is effectively reduced, the starting time is shortened, and a part of energy can be saved. Not only can the waste energy be partially recycled, but also the response speed is faster.
The embodiment stores the energy generated in the stopping process of the motor, releases the stored energy to provide the initial speed for the motor when the motor is started, thereby effectively reducing the impact current when the motor is started, and because the motor obtains the initial speed, the starting time of the motor is correspondingly shortened, and the energy required by starting is also correspondingly reduced. Compared with starting modes such as an open star triangle, a closed star triangle, a soft start and a variable frequency start, the mechanism for storing energy enables the cost of the motor starting cabinet to be lower and the occupied space to be less.
Optionally, storing energy according to a motor shutdown process, comprising: and storing the set energy in the motor stopping process by using the energy storage mechanism. The set energy may be a part of energy originally consumed by the resistance during the motor stopping process in the prior art, that is, in the embodiment of the present invention, a part of energy during the motor stopping process is consumed by the resistance of the brake system, and another part of energy is stored for use when the motor is started. The energy storage mechanism is connected with the motor, can acquire and store set energy in the motor stopping process, and can release the stored energy to the motor when starting.
This alternative embodiment utilizes the energy storage mechanism to store energy such that when the motor is started, energy is released through the energy storage mechanism to provide an initial speed to the motor, reducing the impact current. For example, the energy storage mechanism can comprise an energy storage motor and an energy storage spring, and the occupied space is small and the cost is low.
Further, the method for storing the set energy in the motor shutdown process by using the energy storage mechanism comprises the following steps: reading the preset energy storage size and/or energy storage duration; and controlling the energy storage mechanism to store energy according to the energy storage size and/or the energy storage duration.
The energy storage size refers to how much energy needs to be stored, and the energy storage duration refers to the time consumed for storing the required energy. Specifically, the energy storage size and/or the energy storage duration may be set according to the initial speed of the demand, for example, the acceptable impact current may be determined according to a plurality of experiments, and the initial speed of the motor corresponding to the impact current may be determined, so as to determine the energy required for providing the initial speed, that is, how much energy needs to be stored or the energy storage duration. When the energy storage size and/or the energy storage time reach, the energy storage is finished, and the shutdown is finished.
According to the embodiment, the required energy is stored according to the preset energy storage size and/or the preset energy storage duration, and the required initial speed can be obtained when the motor is started, so that the impact current is reduced to an acceptable degree.
In an alternative embodiment, releasing the stored energy to provide an initial speed for the motor in response to the start command comprises: detecting a starting instruction; acquiring an energy storage identifier; and controlling the starting of the motor according to the energy storage identifier. The energy storage identifier is used for representing that the current state of the energy storage mechanism is an energy storage state or an energy storage-free state, for example, resetting represents that energy is not stored, and setting represents that energy is stored. The energy storage identification is initialized to a default state, namely, no energy is stored; the energy is stored in the stopping process, the energy storage mark is changed into stored energy after stopping, the energy is released in the starting process, and the energy storage mark is not stored after starting.
Specifically, the method for controlling the starting of the motor according to the energy storage identifier comprises the following steps: if the energy storage mark is not stored, determining that the motor is started for the first time, and storing energy according to the control operation of a user; after the energy storage is finished, executing the starting operation of the motor, and releasing the stored energy to provide an initial speed for the motor; and if the energy storage mark is stored energy, directly releasing the stored energy to provide the initial speed for the motor.
If the motor is started for the first time, because the shutdown process does not exist before, the energy storage is not automatically carried out, the user can be prompted to manually operate to store the energy at the moment, the motor starting operation is executed after the energy storage is finished, the stored energy is released to provide the initial speed for the motor, and therefore the current impact when the motor is started for the first time is guaranteed to be reduced.
For the shutdown process, a shutdown instruction can be detected, and energy storage is controlled by combining an energy storage identifier, so that energy storage and release are accurately performed, and the normal startup of the motor is guaranteed.
Example two
Based on the same inventive concept, the present embodiment provides a motor control apparatus that can be used to implement the motor control method described in the above embodiments. The apparatus may be implemented by software and/or hardware.
Fig. 2 is a block diagram showing a configuration of a motor control apparatus according to a second embodiment of the present invention, and as shown in fig. 2, the apparatus includes:
an energy storage module 21 for storing energy according to a motor stop process in response to a stop command;
an energy release module 22 is configured to release the stored energy to provide an initial speed to the motor in response to the start command.
Optionally, the energy storage module 21 comprises: and the energy storage unit is used for storing the set energy in the stopping process of the motor by using the energy storage mechanism.
Optionally, the energy storage unit includes:
the reading subunit is used for reading the preset energy storage size and/or the preset energy storage duration;
and the control subunit is used for controlling the energy storage mechanism to store energy according to the energy storage size and/or the energy storage duration.
Optionally, the energy release module 22 comprises:
the detection unit is used for detecting a starting instruction;
the acquisition unit is used for acquiring the energy storage identifier;
and the control unit is used for controlling the starting of the motor according to the energy storage identifier.
Optionally, the control unit is specifically configured to: if the energy storage mark is not stored, determining that the motor is started for the first time, and storing energy according to the control operation of a user; after the energy storage is finished, executing the starting operation of the motor, and releasing the stored energy to provide an initial speed for the motor; and if the energy storage mark is stored energy, directly releasing the stored energy to provide the initial speed for the motor.
The device can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
EXAMPLE III
On the basis of the above-described embodiments, the present embodiment provides a motor system, as shown in fig. 3, including: the electric motor 31, the energy storage mechanism 32 connected to the electric motor, and the motor control device 33, the motor control device 33 being connected to the energy storage mechanism 32.
The energy storage mechanism 32 is used to release the stored energy when the motor is started to obtain a certain initial speed or store a part of the energy when the motor is stopped, under the control of the motor control device 33.
The motor 31, as an actuator, receives energy released from the energy storage mechanism 32 or feeds back energy to the energy storage mechanism 32.
The above motor system may further include: and a power supply module 34 connected to the motor control device 33 for supplying power to the motor control device 33.
Energy storage mechanism and motor controlling means are passed through to this embodiment, and the energy is stored when the motor stops, and the energy that releases to store provides the initial velocity for the motor when the motor starts to impulse current when effectively reducing the start shortens the activation time, reduces the required energy of start, and above-mentioned structure is with low costs, occupation space is little.
Of course, the division of the modules or units is only used as an example and does not constitute an undue limitation to the present application. For example, the motor control device can be further divided into a detection module and a control module, wherein the detection module is used for detecting a starting instruction or a stopping instruction; the control module is used for controlling energy storage according to the starting instruction or controlling energy release according to the stopping instruction.
Example four
This embodiment is based on the above embodiment, and the above motor control scheme is described with reference to a specific example, however, it should be noted that this embodiment is only for better describing the present application, and should not be construed as an unlimited limitation to the present application. The same or corresponding terms as those of the above-described embodiments are explained, and the description of the present embodiment is omitted.
As shown in fig. 4, the motor control process includes the steps of:
step S1: starting;
step S2: a preparation stage, wherein a control program, an energy storage mechanism state and the like are initialized, and parameters such as the energy storage size and the energy storage duration are set;
step S3: manual energy storage, wherein if the motor is started for the first time, the energy storage mechanism is in a reset state (namely an energy storage-free state), so that manual energy storage is needed before starting, and the impact current of the motor when the motor is started for the first time is reduced;
step S4: detecting that the system sends a shutdown command to the motor, or that an emergency shutdown button has been triggered;
step S5: storing energy according to the set energy storage size and/or energy storage duration;
step S6: detecting that the system sends a start command to the motor;
step S7: releasing the stored energy to allow the motor to attain a certain initial speed, and then returning to step S4, the process may loop between step S4 and step S7;
step S8: and the control is finished.
EXAMPLE five
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements a motor control method according to one embodiment of the present invention.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A motor control method, characterized by comprising:
responding to a stop command, and storing energy according to the stop process of the motor;
in response to a start command, the stored energy is released to provide an initial speed for the motor.
2. The method of claim 1, wherein storing energy according to a motor shutdown process comprises:
and storing the set energy in the motor stopping process by using an energy storage mechanism.
3. The method of claim 2, wherein storing the set energy during the motor shutdown using an energy storage mechanism comprises:
reading the preset energy storage size and/or energy storage duration;
and controlling the energy storage mechanism to store energy according to the energy storage size and/or the energy storage duration.
4. The method of claim 1, wherein releasing the stored energy to provide an initial speed for the motor in response to a start command comprises:
detecting the starting instruction;
acquiring an energy storage identifier;
and controlling the starting of the motor according to the energy storage identifier.
5. The method of claim 4, wherein controlling the starting of the motor based on the energy storage indicator comprises:
if the energy storage identification is not stored, determining that the motor is started for the first time, and storing energy according to the control operation of a user;
after the energy storage is finished, executing the starting operation of the motor, and releasing the stored energy to provide an initial speed for the motor;
and if the energy storage identifier is stored energy, directly releasing the stored energy to provide an initial speed for the motor.
6. A motor control device characterized by comprising:
the energy storage module is used for responding to the stop command and storing energy according to the stop process of the motor;
and the energy release module is used for responding to a starting instruction and releasing the stored energy to provide an initial speed for the motor.
7. The apparatus of claim 6, wherein the energy storage module comprises:
and the energy storage unit is used for storing the set energy in the motor stopping process by using the energy storage mechanism.
8. An electric motor system, comprising: an electric motor, an energy storage mechanism connected to the electric motor, and the motor control device of claim 6 or 7, the motor control device being connected to the energy storage mechanism.
9. The electric motor system of claim 8, further comprising:
and the power supply module is connected with the motor control device and used for supplying power to the motor control device.
10. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 1 to 5.
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| CN201911167608.2A CN110855190B (en) | 2019-11-25 | 2019-11-25 | Motor control method, device and motor system |
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| CN201911167608.2A CN110855190B (en) | 2019-11-25 | 2019-11-25 | Motor control method, device and motor system |
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| CN206759350U (en) * | 2017-05-13 | 2017-12-15 | 上海建东科技有限公司 | A kind of shutdown decompression protection device of permagnetic synchronous motor |
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2019
- 2019-11-25 CN CN201911167608.2A patent/CN110855190B/en active Active
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| JPH0799784A (en) * | 1993-09-27 | 1995-04-11 | Fuji Electric Co Ltd | Charge-discharge control circuit for inverter |
| CN1845417A (en) * | 2006-04-10 | 2006-10-11 | 中国科学院电工研究所 | Hybrid energy-storage device for elevator and its controlling method |
| CN101056011A (en) * | 2006-08-08 | 2007-10-17 | 王怀成 | An electric vehicle mixed power |
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