CN203301420U - Motor control system - Google Patents
Motor control system Download PDFInfo
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- CN203301420U CN203301420U CN201320377440XU CN201320377440U CN203301420U CN 203301420 U CN203301420 U CN 203301420U CN 201320377440X U CN201320377440X U CN 201320377440XU CN 201320377440 U CN201320377440 U CN 201320377440U CN 203301420 U CN203301420 U CN 203301420U
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- motor
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- collecting device
- electric
- control system
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Abstract
The utility model relates to electrical equipment and particularly to a motor control system. The system comprises a motor control system which is characterized by comprising a current acquisition apparatus, a control apparatus, a wiring conversion apparatus and resistors; and the current acquisition apparatus and the wiring conversion apparatus are connected with the control apparatus. The current acquisition apparatus is used for acquiring and transmitting current information of a motor; the control apparatus is used for transmitting a first control signal when the motor is started, receiving the current information, and transmitting a second control signal when it is confirmed that a current of the motor is within the scope of a rated current; and the wiring conversion apparatus is used for receiving the first control signal and making a rotor of the motor and the resistors to form a closed-loop, and receiving the second control signal and making the rotor of the motor and a power supply to form a closed-loop. The motor control system can make a power factor of the motor to be higher than that of ordinary synchronous motors and asynchronous motors.
Description
Technical field
The utility model relates to power equipment, particularly a kind of electric machine control system.
Background technology
Motor is the main motive power of national product, and the annual electric energy that consumes accounts for 65% to 70% of national gross generation.Motor generally has two kinds of synchronous machine and asynchronous machines.Rotor and the stator of synchronous machine are all switched on, and therefore have identical power, make rotor synchronize and rotate with stator.The power factor of synchronous machine is generally high than asynchronous machine, but the moment of torsion of this motor is less, can not drive larger load when starting, and that loading on of can driving when starting can cause because load is too small power factor to be handed over after reaching stable rotation is low.
And do not have between the stator and rotor of asynchronous machine the electricity contact directly, the energy of rotor is produced by the stator field induction, it is to produce induced electromotive force and current－carrying conductor according to the conductor cutting magnetic field to be subject to these two principle work of effect of electromagnetic force in magnetic field, therefore asynchronous machine has larger starting torque, can drive larger load.But the rotating speed of asynchronous motor is not equal to synchronous speed, two rotating speeds can not be synchronous, and motor speed is less than synchronous speed, the difference of synchronous speed and motor speed and the ratio of synchronous speed are the revolutional slip of motor, because resistance and the reactance of rotor winding are substantially constant, the power factor of rotor current and rotor circuit is all to descend with revolutional slip, it is large that revolutional slip becomes gradually, power factor just progressively rises, when the load overrate is a lot, revolutional slip is excessive, and electromagnetic torque descends until stall.In actual applications, while considering the factor such as starting and mechanical equipment coordination use, be generally selected in motor nominal load 50-80%, leave certain amount of redundancy, and equipment does not reach design power at all in real work, such as oil pumper, ball mill etc., the long-term light running of motor, cause the power factor of motor further to reduce.
Therefore, the power factor of two kinds of motors is all not high.
The utility model content
The utility model provides a kind of electric machine control system, can realize the asynchronous starting of motor, synchronous operation.
In order to achieve the above object, the technical solution of the utility model is achieved in that
Electric machine control system, comprise current collecting device, control device, connecting wire switching device and resistance;
Described current collecting device and described connecting wire switching device all are connected with described control device;
Described current collecting device is used for: the current information that gathers concurrent power transmission machine;
Described control device is used for: send the first control signal when electric motor starting; Receive described current information, and send the second control signal after the electric current of confirming motor is in its rated current scope;
Described connecting wire switching device is used for: receive described the first control signal and the rotor of motor and described resistance are formed closed-loop path; Receive described the second control signal and the rotor of motor and power supply are formed closed-loop path.
Further, in aforesaid electric machine control system, also comprise voltage collecting device and load factor adjusting device; Described voltage collecting device is connected with described control device;
Described voltage collecting device is used for: the information of voltage that gathers concurrent power transmission machine;
Described control device is further used for: receive described information of voltage, to described current information and described information of voltage is analyzed and according to analysis result, generate the 3rd control signal;
Described load factor adjusting device is used for: receive described the 3rd control signal, and change to supply with the electric current of rotor and voltage and then increase trochiterian load factor.
Further, in aforesaid electric machine control system, described voltage collecting device is voltmeter.
Further, in aforesaid electric machine control system, the integrated motor information collecting device that is set to of described current collecting device and described voltage collecting device.
Further, in aforesaid electric machine control system, described motor information collecting device is universal instrument.
Further, in aforesaid electric machine control system, also comprise the power-supply controller of electric for the "on" position of controlling motor and control device.
Further, in aforesaid electric machine control system, described power-supply controller of electric is electric brake.
Further, in aforesaid electric machine control system, described current collecting device is ammeter.
Compared with prior art, electric machine control system described in the utility model can make the rotor of motor be under different operating states: when connecting wire switching device made rotor and resistance form closed-loop path, rotor self no power, only had the stator energising.At this moment motor is equivalent to asynchronous machine, and the magnetic field of rotor induction stator also produces induced current, and then the rotor banding dynamic load is rotated in closed-loop path.At startup stage electric current 3 times of rated current normally of motor, and when load starts to rotate after-current can fast-descending.Again rotor and power supply are formed closed-loop path return within the rated current scope of motor when electric current after.This moment, motor was equivalent to synchronous machine, but the load that the common synchronous machine of its duty ratio that drives can drive will be greatly, so can make the power factor of motor more common synchronous machine and asynchronous machine higher.
In addition, electric machine control system provided by the utility model also has following technique effect:
(1) by gathering simultaneously electric current and information of voltage, can adjust electric current and the voltage of rotor by these information, increase trochiterian load factor, and then improve the power factor of motor.
(2) can control fast the "on" position of system by power-supply controller of electric is set, improve fail safe and the operability of system.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is execution modes more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structured flowchart of the utility model embodiment one described electric machine control system;
Fig. 2 is the structured flowchart of the utility model embodiment two described electric machine control systems;
Fig. 3 is the flow chart of the utility model embodiment three described motor control methods;
Fig. 4 is the flow chart of the utility model embodiment four described motor control methods.
Reference numeral: 1-current collecting device, 2-control device, 3-connecting wire switching device, 4-resistance, 5-power-supply controller of electric, 6-motor information collecting device, 7-load factor adjusting device.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer; below will carry out clear, complete description to the technical solution of the utility model; based on the embodiment in the utility model; those of ordinary skills are resulting all other execution modes under the prerequisite of not making creative work, all belong to the scope that the utility model is protected.
Embodiment one
Embodiment one of the present utility model provides a kind of electric machine control system, as shown in Figure 1, comprises current collecting device 1, control device 2, connecting wire switching device 3 and resistance 4;
Described harvester and connecting wire switching device 3 all are connected with control device 2;
Current collecting device 1 is used for: the current information that gathers concurrent power transmission machine;
Control device 2 is used for: send the first control signal when electric motor starting; Receive described current information, and send the second control signal after the electric current of confirming motor is in its rated current scope;
Connecting wire switching device 3 is used for: receive described the first control signal and the rotor of motor and resistance 4 are formed closed-loop path; Receive described the second control signal and the rotor of motor and power supply are formed closed-loop path.
When connecting wire switching device 3 made rotor and resistance 4 form closed-loop path, rotor self no power, only had the stator energising.At this moment motor is equivalent to asynchronous machine, and the magnetic field of rotor induction stator also produces induced current, and then the rotor banding dynamic load is rotated in closed-loop path.Burn out circuit in order to prevent that the induced current that produces in closed-loop path is excessive, need to add resistance 4 to reduce electric current in closed-loop path.At startup stage electric current 3 times of rated current normally of motor, and when load starts to rotate after-current can fast-descending.Again rotor and power supply are formed closed-loop path return within the rated current scope of motor when electric current after.This moment, motor was equivalent to synchronous machine, but the load that the common synchronous machine of its duty ratio that drives can drive will be greatly, so can make the power factor of motor more common synchronous machine and asynchronous machine higher.
Wherein, current collecting device 1 can have the device of current information acquisition function for ammeter or other.
Embodiment two
Embodiment two of the present utility model provides another kind of electric machine control system, as shown in Figure 2, comprises current collecting device 1, voltage collecting device, control device 2, connecting wire switching device 3, load factor adjusting device 7 and resistance 4;
Current collecting device 1, voltage collecting device and connecting wire switching device 3 all are connected with control device 2;
Current collecting device 1 is used for: the current information that gathers concurrent power transmission machine;
Voltage collecting device is used for: the information of voltage that gathers concurrent power transmission machine;
Control device 2 is used for: send the first control signal when electric motor starting; Receive described current information and information of voltage, and send the second control signal after the electric current of confirming motor is in its rated current scope; To described current information and described information of voltage is analyzed and according to analysis result, generate the 3rd control signal;
Connecting wire switching device 3 is used for: receive described the first control signal and the rotor of motor and resistance 4 are formed closed-loop path; Receive described the second control signal and the rotor of motor and power supply are formed closed-loop path.
Load factor adjusting device 7 is used for: receive described the 3rd control signal, and change to supply with the electric current of rotor and voltage and then increase trochiterian load factor.
By gathering simultaneously electric current and information of voltage, can adjust electric current and the voltage of rotor by these information, increase trochiterian load factor, and then improve the power factor of motor.
Wherein, voltage collecting device can gather the device of information of voltage for voltmeter or other; Also can be with current collecting device 1 and integrated motor information collecting device 6, for example universal instrument of being set to of voltage collecting device.Volume is less so more, can conserve space.
For power consumption equipment, constantly controlling it is vital with electricity condition for safety.For this reason, can also comprise power-supply controller of electric 5 for the "on" position of controlling motor and control device 2 in this system.Power-supply controller of electric 5 can have the device of controlling "on" position for electric brake or other.Can control fast the "on" position of system like this, improve fail safe and the operability of system.
, in order more clearly to describe the technical solution of the utility model, now provide two embodiment to describe.
Embodiment three
Embodiment three of the present utility model provides a kind of motor control method, as shown in Figure 3, comprises the following steps:
301) when electric motor starting, the rotor of motor and resistance are formed closed-loop path;
302) gather the current information of motor;
303) after the electric current of confirming motor is in its rated current scope, the rotor of motor and power supply are formed closed-loop path.
When connecting wire switching device made rotor and resistance form closed-loop path, rotor self no power, only had the stator energising.At this moment motor is equivalent to asynchronous machine, and the magnetic field of rotor induction stator also produces induced current, and then the rotor banding dynamic load is rotated in closed-loop path.At startup stage electric current 3 times of rated current normally of motor, and when load starts to rotate after-current can fast-descending.Again rotor and power supply are formed closed-loop path return within the rated current scope of motor when electric current after.This moment, motor was equivalent to synchronous machine, but the load that the common synchronous machine of its duty ratio that drives can drive will be greatly, so can make the power factor of motor more common synchronous machine and asynchronous machine higher.
Embodiment four
Embodiment four of the present utility model provides another kind of motor control method, as shown in Figure 4, comprises the following steps:
401) when electric motor starting, the rotor of motor and resistance are formed closed-loop path;
402) gather the current information of motor;
403) after the electric current of confirming motor is in its rated current scope, the rotor of motor and power supply are formed closed-loop path;
404) gather electric current and the information of voltage of motor;
405) described current information and described information of voltage are analyzed;
406) change to supply with the electric current of rotor and voltage and then increase trochiterian load efficiency according to analysis result.
By gathering simultaneously electric current and information of voltage, can adjust electric current and the voltage of rotor by these information, increase trochiterian load factor, and then improve the power factor of motor.
It should be noted that finally: above execution mode and embodiment only, in order to the technical solution of the utility model to be described, are not intended to limit; Although with reference to aforementioned embodiments and embodiment, the utility model is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned embodiments or embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make essence disengaging the utility model execution mode of appropriate technical solution or the spirit and scope of embodiment technical scheme.
Claims (8)
1. electric machine control system, is characterized in that: comprise current collecting device, control device, connecting wire switching device and resistance;
Described current collecting device and described connecting wire switching device all are connected with described control device;
Described current collecting device is used for: the current information that gathers concurrent power transmission machine;
Described control device is used for: send the first control signal when electric motor starting; Receive described current information, and send the second control signal after the electric current of confirming motor is in its rated current scope;
Described connecting wire switching device is used for: receive described the first control signal and the rotor of motor and described resistance are formed closed-loop path; Receive described the second control signal and the rotor of motor and power supply are formed closed-loop path.
2. electric machine control system as claimed in claim 1, is characterized in that: also comprise voltage collecting device and load factor adjusting device; Described voltage collecting device is connected with described control device;
Described voltage collecting device is used for: the information of voltage that gathers concurrent power transmission machine;
Described control device is further used for: receive described information of voltage, to described current information and described information of voltage is analyzed and according to analysis result, generate the 3rd control signal;
Described load factor adjusting device is used for: receive described the 3rd control signal, and change to supply with the electric current of rotor and voltage and then increase trochiterian load factor.
3. electric machine control system as claimed in claim 2, it is characterized in that: described voltage collecting device is voltmeter.
4. electric machine control system as claimed in claim 2, is characterized in that: the integrated motor information collecting device that is set to of described current collecting device and described voltage collecting device.
5. electric machine control system as claimed in claim 4, it is characterized in that: described motor information collecting device is universal instrument.
6. electric machine control system as claimed in claim 1 or 2, is characterized in that: also comprise the power-supply controller of electric for the "on" position of controlling motor and control device.
7. electric machine control system as claimed in claim 6, it is characterized in that: described power-supply controller of electric is electric brake.
8. electric machine control system as claimed in claim 1 or 2, it is characterized in that: described current collecting device is ammeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320377440XU CN203301420U (en) | 2013-06-26 | 2013-06-26 | Motor control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320377440XU CN203301420U (en) | 2013-06-26 | 2013-06-26 | Motor control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203301420U true CN203301420U (en) | 2013-11-20 |
Family
ID=49577400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320377440XU Withdrawn - After Issue CN203301420U (en) | 2013-06-26 | 2013-06-26 | Motor control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203301420U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312258A (en) * | 2013-06-26 | 2013-09-18 | 东营市凌通石油机械制业有限责任公司 | Motor control system and method |
-
2013
- 2013-06-26 CN CN201320377440XU patent/CN203301420U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312258A (en) * | 2013-06-26 | 2013-09-18 | 东营市凌通石油机械制业有限责任公司 | Motor control system and method |
| CN103312258B (en) * | 2013-06-26 | 2016-06-15 | 东营市凌通石油机械制业有限责任公司 | Electric machine control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131120 Effective date of abandoning: 20160615 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |