CN103312258A - Motor control system and method - Google Patents
Motor control system and method Download PDFInfo
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- CN103312258A CN103312258A CN2013102642022A CN201310264202A CN103312258A CN 103312258 A CN103312258 A CN 103312258A CN 2013102642022 A CN2013102642022 A CN 2013102642022A CN 201310264202 A CN201310264202 A CN 201310264202A CN 103312258 A CN103312258 A CN 103312258A
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Abstract
The invention relates to an electrical device, in particular to a motor control system and method. The motor control system comprises a current acquiring device, a control device, a wiring conversion device and a resistor. The current acquiring device and the wiring conversion device are connected with the control device. The current acquiring device is used for acquiring current of a motor. The control device is used for sending a first control signal during starting and sending a second control signal after the current of the motor is ensured to be in a rated current range. The wiring conversion device is used for receiving the first control signal and then enabling a rotor of the motor and the resistor to form a closed loop and receiving the second control signal and then enabling the rotor of the motor and a power supply to form a closed loop. The motor control method comprises the steps of enabling the rotor of the motor and the resistor to form the closed loop during motor starting, acquiring current information of the motor and enabling the rotor and the power supply to form the closed loop after the current is ensured to be in the rated current range. The motor control system and method can enable the power factors of the motor to be high.
Description
Technical field
The present invention relates to power equipment, particularly a kind of electric machine control system and method.
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, and rotor and stator are rotated synchronously.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 owing to 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 are subject to electromagnetic force in magnetic field these two principle work of effect according to the conductor cutting 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 all is 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, when 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 causes the power factor of motor further to reduce.
Therefore, the power factor of two kinds of motors is all not high.
Summary of the invention
The invention provides a kind of electric machine control system;
The present invention also provides a kind of motor control method;
Electric machine control system provided by the present invention and method can realize the asynchronous starting of motor, synchronous operation.
In order to achieve the above object, technical scheme of the present invention is achieved in that
Electric machine control system comprises 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 and send motor;
Described control device is used for: send the first control signal when electric motor starting; Receive described current information, and after the electric current of confirming motor is in its rated current scope, send the second control signal;
Described connecting wire switching device is used for: receive described the first control signal and the rotor of motor and described resistance are formed the closed-loop path; Receive described the second control signal and the rotor of motor and power supply are formed the closed-loop path.
Further, in the 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 and send motor;
Described control device is further used for: receive described information of voltage, described current information and described information of voltage are analyzed and generated the 3rd control signal according to analysis result;
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 the aforesaid electric machine control system, described voltage collecting device is voltmeter.
Further, in the 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 the aforesaid electric machine control system, described motor information collecting device is universal instrument.
Further, in the aforesaid electric machine control system, also comprise the power-supply controller of electric for the "on" position of control motor and control device.
Further, in the aforesaid electric machine control system, described power-supply controller of electric is electric brake.
Further, in the aforesaid electric machine control system, described current collecting device is ammeter.
Motor control method comprises the following steps:
Rotor and resistance with motor when electric motor starting form the closed-loop path;
Gather the current information of motor;
Rotor and power supply with motor after the electric current of confirming motor is in its rated current scope form the closed-loop path.
Further, in the aforesaid motor control method, after described electric current confirming motor is in its rated current scope the rotor of motor and the step of power supply formation closed-loop path are further comprised afterwards:
Gather electric current and the information of voltage of motor;
Described current information and described information of voltage are analyzed;
Change to supply with the electric current of rotor and voltage and then increase trochiterian load efficiency according to analysis result.
Compared with prior art, electric machine control system of the present invention and method can make the rotor of motor be under the different operating states: when connecting wire switching device made rotor and resistance form the 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 the closed-loop path.At startup stage electric current 3 times of rated current normally of motor, and when load begins to rotate after-current can fast-descending.Again rotor and power supply are formed the 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 present invention and method also have 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 Security of the system and operability.
Description of drawings
In order to be illustrated more clearly in the specific embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes is some embodiments of the present invention, 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 embodiment of the invention one described electric machine control system;
Fig. 2 is the structured flowchart of the embodiment of the invention two described electric machine control systems;
Fig. 3 is the flow chart of the embodiment of the invention three described motor control methods;
Fig. 4 is the flow chart of the embodiment of the invention 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, technical solutions and advantages of the present invention clearer; the below will carry out clear, complete description to technical scheme of the present invention; based on the embodiment among the present invention; 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 present invention protects.
Embodiment one
Embodiments of the invention one provide a kind of electric machine control system, as shown in Figure 1, comprise 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 and send motor;
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 paths; Receive described the second control signal and the rotor of motor and power supply are formed the closed-loop path.
When connecting wire switching device 3 made rotor and resistance 4 form the 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 the closed-loop path.Burn out circuit for the induced current that prevents from producing in the closed-loop path is excessive, need in the closed-loop path, add resistance 4 to reduce electric current.At startup stage electric current 3 times of rated current normally of motor, and when load begins to rotate after-current can fast-descending.Again rotor and power supply are formed the 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
Embodiments of the invention two provide another kind of electric machine control system, as shown in Figure 2, comprise 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 and send motor;
Voltage collecting device is used for: the information of voltage that gathers and send motor;
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 paths; Receive described the second control signal and the rotor of motor and power supply are formed the 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 in this system, also comprise power-supply controller of electric 5 for the "on" position of control motor and control device 2.Power-supply controller of electric 5 can have for electric brake or other device of control "on" position.Can control fast the "on" position of system like this, improve Security of the system and operability.
Embodiment three
Embodiments of the invention three provide a kind of motor control method, as shown in Figure 3, comprise the following steps:
301) when electric motor starting, the rotor of motor and resistance are formed the closed-loop path;
302) current information of collection motor;
303) after the electric current of confirming motor is in its rated current scope with the rotor and power supply formation closed-loop path of motor.
When connecting wire switching device made rotor and resistance form the 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 the closed-loop path.At startup stage electric current 3 times of rated current normally of motor, and when load begins to rotate after-current can fast-descending.Again rotor and power supply are formed the 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
Embodiments of the invention four provide another kind of motor control method, as shown in Figure 4, comprise the following steps:
401) when electric motor starting, the rotor of motor and resistance are formed the closed-loop path;
402) current information of collection motor;
403) after the electric current of confirming motor is in its rated current scope with the rotor and power supply formation closed-loop path of motor;
404) electric current and the information of voltage of collection 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 at last: above execution mode and embodiment only in order to technical scheme of the present invention to be described, are not intended to limit; Although with reference to aforementioned embodiments and embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment 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 the essence disengaging embodiment of the present invention of appropriate technical solution or the spirit and scope of embodiment technical scheme.
Claims (10)
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 and send motor;
Described control device is used for: send the first control signal when electric motor starting; Receive described current information, and after the electric current of confirming motor is in its rated current scope, send the second control signal;
Described connecting wire switching device is used for: receive described the first control signal and the rotor of motor and described resistance are formed the closed-loop path; Receive described the second control signal and the rotor of motor and power supply are formed the 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 and send motor;
Described control device is further used for: receive described information of voltage, described current information and described information of voltage are analyzed and generated the 3rd control signal according to analysis result;
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 control 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.
9. motor control method is characterized in that, comprises the following steps:
Rotor and resistance with motor when electric motor starting form the closed-loop path;
Gather the current information of motor;
Rotor and power supply with motor after the electric current of confirming motor is in its rated current scope form the closed-loop path.
10. motor control method as claimed in claim 9 is characterized in that, after described electric current confirming motor is in its rated current scope the rotor of motor and the step of power supply formation closed-loop path is further comprised afterwards:
Gather electric current and the information of voltage of motor;
Described current information and described information of voltage are analyzed;
Change to supply with the electric current of rotor and voltage and then increase trochiterian load efficiency according to analysis result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310264202.2A CN103312258B (en) | 2013-06-26 | 2013-06-26 | Electric machine control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310264202.2A CN103312258B (en) | 2013-06-26 | 2013-06-26 | Electric machine control system |
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| CN103312258A true CN103312258A (en) | 2013-09-18 |
| CN103312258B CN103312258B (en) | 2016-06-15 |
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| CN201310264202.2A Expired - Fee Related CN103312258B (en) | 2013-06-26 | 2013-06-26 | Electric machine control system |
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| CN106849014A (en) * | 2017-03-23 | 2017-06-13 | 马鞍山工蜂智能科技有限公司 | A kind of motor safety controls circuit system |
| CN107269129A (en) * | 2017-08-03 | 2017-10-20 | 深圳市驿固科技有限公司 | The control method and lock body of a kind of mutual assistance group of motors |
| CN113682249A (en) * | 2021-08-30 | 2021-11-23 | 杭叉集团股份有限公司 | Charging management system for industrial vehicle lithium battery assembly |
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| CN103312258B (en) | 2016-06-15 |
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