CN104104302A - Automatic control device capable of reducing speed, increasing torque and limiting current of electric motor - Google Patents
Automatic control device capable of reducing speed, increasing torque and limiting current of electric motor Download PDFInfo
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- CN104104302A CN104104302A CN201310124276.6A CN201310124276A CN104104302A CN 104104302 A CN104104302 A CN 104104302A CN 201310124276 A CN201310124276 A CN 201310124276A CN 104104302 A CN104104302 A CN 104104302A
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Abstract
The invention relates to an automatic control device capable of reducing the speed, increasing the torque and limiting the current of an electric motor, and belongs to the technical field of electric motor drive control. The automatic control device is characterized in that: four groups of resistors, which are enough in capacity and unequal in resistance, are correspondingly connected to a three-phase current loop of a wound rotor type electric motor rotor in series, three resistors in each of the groups are equal in resistance, each group of resistors are in short circuit connection by using a short circuit switch, a speed sensor is installed on a brush bracket of the electric motor rotor, the speed sensor is connected with a controller, the controller receives rotating speed information inputted by the speed sensor, carries out signal amplification programming, determines the rated speed corresponding to a main electric motor, and develops four programs so as to respectively control the four short circuit switches to open or close timely, thereby adjusting the resistance and the power consumption of the current loop of the electric motor rotor, limiting the starting current of the electric motor, and increasing the starting torque of the electric motor. In addition, the automatic control device can realize automatic adjustment when the electric motor is in operation, thereby limiting overload current of the electric motor, and increasing the operation torque in overload of the electric motor in a short time.
Description
Technical field
The present invention relates to a kind of motor deceleration and increase square current limliting automatic control equipment, in order to resistance value and the power consumption in automatic adjusting wound-rotor motor rotor current loop, when motor starting, restriction starting current, increases starting torque; In service at motor, because causing motor speed, traffic overload declines, and when running current raises, energy volitional check overload current, increases operation torque, belongs to motor run control technology field.
Background technology
At present, multiple loading moment changes frequent equipment greatly, as winch, large-scale hoister, sand-digging machine, general adapted wound-rotor motor is power, mostly adopt the many groups of series winding resistance in the rotor current loop of wound-rotor motor, form a plurality of gears, by manual operations, shifted gears, it requires high to the skills involved in the labour of operation, operation labour intensity is large; In addition also have miscellaneous equipment as ball mill, disintegrating machine adapted wound-rotor motor be power; be generally, after wound-rotor motor has started, directly rotor coil short circuit to be become to asterism, during work, can not shift gears; if charging is irregular; suddenly charging is too much, causes motor moment inadequate, and rotating speed declines; stall even; operating current rises sharply, and to equipment being damaged or trip protection shutdown, brings great maintenance workload.
Summary of the invention
Object of the present invention is exactly for above-mentioned deficiency, provide a kind of motor deceleration to increase square current limliting automatic control equipment, in order to resistance and the power consumption in automatic adjusting wound-rotor motor rotor current loop, when motor starting, restriction starting current, increases starting torque; In service at motor, because causing electronic motor-driven rotating speed, traffic overload declines, and when electric current raises, energy volitional check overload current, increases operation torque.
Technical scheme of the present invention is: described a kind of motor deceleration increases square current limliting automatic control equipment, it is characterized in that: in wound-rotor motor rotor three-phase current circuit, four groups of enough capacities of corresponding series winding access, the resistance that resistance does not wait, and three resistances of each group resistance equate, three resistance head ends at every group of resistance respectively carry out short circuit with a shorting switch, the tail end of three resistance of last group is connected into asterism, controller receives the rotating speed Xin breath of speed probe input, carry out No. Xin and amplify programming, corresponding to main motor, determine rated speed, work out four programs, control respectively the closed or disconnection in good time of four shorting switchs, to regulate resistance value and the power consumption in motor rotor current circuit, and the starting of restrictions motor or overload current, the starting of increasing motor or operation torque.
The present invention has following advantage:
1, this device not only has wound-rotor motor soft start function, and in service at motor, because traffic overload causes motor speed, declines, and when running current raises, the overload current of energy volitional check motor, increases operation torque;
2, processing ease, operation labour intensity is low;
3, be not subject to the impact in environment for use and temperature and geographical position;
4, simple in structure, easily to manufacture, maintenance technology is understandable easy, and maintenance cost is low;
5, safe and reliable to operation, long service life, overload capacity is strong.
accompanying drawing explanation:
Fig. 1 is that the present invention executes routine electrical structure schematic diagram;
In figure, the member name of each figure number is called: 1, main power switch 2, controller 3, controller power source switch 4, speed probe R1, the 1st group of resistance R 2, the 2nd group of resistance R 3, the 3rd group of resistance R 4, the 4th group of resistance K1, shorting switch 1 K2, shorting switch 2 K3, shorting switch 3 K4, shorting switch 4 M, main motor.
Structure explanation of the present invention, and operation principle explanation: structure explanation (see figure 1), the corresponding connection of rotor leading-out wire by the head end of three resistance of the 1st group of resistance (R1) with main motor (M), simultaneously by shorting switch 1(K1) and be connected in therebetween, the corresponding connection of three resistance head ends by three resistance tail ends of the 1st group of resistance (R1) with the 2nd group of resistance (R2), simultaneously by shorting switch 2(K2) and be connected in therebetween, the corresponding connection of three resistance head ends by three resistance tail ends of the 2nd group of resistance (R2) with the 3rd group of resistance (R3), simultaneously by shorting switch 3(K3) and be connected in therebetween, the corresponding connection of three resistance head ends by three resistance tail ends of the 3rd group of resistance (R3) with the 4th group of resistance (R4), simultaneously by shorting switch 4(K4) and be connected in therebetween, three resistance tail ends of the 4th group of resistance (R4) are connected into asterism, speed probe (4) is arranged on the brush holder of main motor (M) rotor, the power supply of speed probe (4) and Xin line are connected with controller (2), the upper termination AC220V power supply of controller power source switch (3), controller power source switch (3) lower end is connected with controller (2), operation principle explanation (see figure 1), the operation principle of this device is, the resistance of four groups of enough capacities of series winding access in wound-rotor motor rotor current loop, can reduce starting current or the overload current of motor, resistance heating can consume the power in wound-rotor motor rotor current loop, the turning moment of energy increasing motor, when design serial resistance capacity and resistance, consider total resistance of series winding access resistance in motor rotor current circuit, can be when motor work stall, restrictions motor stator current is 1 times of left and right of motor rated current, the operation principle of controller (2) is, controller (2) receives the rotating speed Xin breath of speed probe (4) input, carry out No. Xin and amplify programming, corresponding to main motor (M), determine rated speed, work out four programs, a, rotating speed is at the more than 95% closed shorting switch 1(K1 of rated speed), rotating speed disconnects shorting switch 1(K1 below 95% in rated speed), b, rotating speed is at the more than 90% closed shorting switch 2(K2 of rated speed), rotating speed disconnects shorting switch 2(K2 below 90% in rated speed), c, rotating speed is at the more than 85% closed shorting switch 3(K3 of rated speed), rotating speed disconnects shorting switch 3(K3 below 85% in rated speed), d, rotating speed is at the more than 65% closed shorting switch 4(K4 of rated speed), rotating speed disconnects shorting switch 4(K4 below 65% in rated speed), below from whole starting and its starting process of running state analysis, ruuning situation and operation principle, connect controller power source switch (3), controller (2) enters operating state, main power switch (1) manually closes, main motor (M) starts slowly running, rotating speed rises gradually, 1 times of left and right that now starting current of main motor (M) is its rated current, when rise of rotational speed arrives rated speed more than 65%, controller (2) is controlled shorting switch 4(K4) closure, the 4th group of resistance (R4) becomes bypass, rotating speed continues to rise, circulate progressive, controller (2) continues to control shorting switch 3(K3), shorting switch 2(K2), shorting switch 1(K1) corresponding automatic closure successively, as shorting switch 1(K1) after closure, all resistance becomes bypass entirely, main motor (M) runs well, start successfully, and reached the successful effect of soft start, when motor runs well, as ball mill, disintegrating machine, if charging is irregular, suddenly charging is too much, cause motor torque inadequate, rotating speed declines, stall even, when rotating speed drops to rated speed 95% when following, controller (2) is controlled shorting switch 1(K1 automatically) disconnect, the 1st group of resistance (R1) is contacted accesses rotor current loop, when if rotating speed intermittently drops to the programme controlled corresponding rotating speed of controller (2), controller (2) can be controlled shorting switch 2(K2), shorting switch 3(K3), shorting switch 4(K4) automatically disconnect successively, by the 2nd group of resistance (R2), the 3rd group of resistance (R3), the 4th group of resistance (R4), successively in series winding access rotor current loop, progressively increase the turning moment of motor, limiting overload Current rise, unlikely equipment breaking-up or the trip protection of making shut down, while running well as winch, large-scale hoister, can easily extract be put down, during perhaps by weight traction enhancement, rated speed torque is inadequate, can make rotating speed decline, when dropping to the programme controlled corresponding rotating speed of controller (2), controller (2) can automatically be controlled and disconnect 1 or several shorting switchs, to increase by 1 group or several groups of resistance, and the turning moment of increasing motor, limiting overload electric current, need not manual operation gearshift.
Embodiment
By reference to the accompanying drawings and execute example the present invention is described as follows:
Fig. 1 is one of the present invention and executes example, connect controller power source switch (3), controller (2) enters operating state, main power switch (1) manually closes, main motor (M) starts slowly running, rotating speed rises gradually, 1 times of left and right that now starting current of main motor (M) is its rated current, when rise of rotational speed arrives rated speed more than 65%, controller (2) is controlled shorting switch 4(K4) closure, the 4th group of resistance (R4) becomes bypass, rotating speed continues to rise, circulate progressive, controller (2) continues to control shorting switch 3(K3), shorting switch 2(K2), shorting switch 1(K1) corresponding automatic closure successively, as shorting switch 1(K1) after closure, all resistance becomes bypass entirely, main motor (M) runs well, start successfully, and reached the successful effect of soft start, when motor runs well, as ball mill, disintegrating machine, if charging is irregular, suddenly charging is too much, cause motor torque inadequate, rotating speed declines, stall even, when rotating speed drops to rated speed 95% when following, controller (2) is controlled shorting switch 1(K1 automatically) disconnect, the 1st group of resistance (R1) is contacted accesses rotor current loop, when if rotating speed intermittently drops to the programme controlled corresponding rotating speed of controller (2), controller (2) can be controlled shorting switch 2(K2), shorting switch 3(K3), shorting switch 4(K4) automatically disconnect successively, by the 2nd group of resistance (R2), the 3rd group of resistance (R3), the 4th group of resistance (R4), successively in series winding access rotor current loop, progressively increase the turning moment of motor, limiting overload Current rise, unlikely equipment breaking-up or the trip protection of making shut down, while running well as winch, large-scale hoister, can easily extract be put down, during perhaps by weight traction enhancement, rated speed torque is inadequate, can make rotating speed decline, when dropping to the programme controlled corresponding rotating speed of controller (2), controller (2) can automatically be controlled and disconnect 1 or several shorting switchs, to increase by 1 group or several groups of resistance, and the turning moment of increasing motor, limiting overload electric current, need not manual operation gearshift.
Claims (1)
1. a motor deceleration increases square current limliting automatic control equipment, it is characterized in that: the corresponding connection of rotor leading-out wire by three resistance head ends of the 1st group of resistance (R1) with main motor (M), simultaneously by shorting switch 1(K1) and be connected in therebetween, the corresponding connection of three resistance head ends by three resistance tail ends of the 1st group of resistance (R1) with the 2nd group of resistance (R2), simultaneously by shorting switch 2(K2) and be connected in therebetween, the corresponding connection of three resistance head ends by three resistance tail ends of the 2nd group of resistance (R2) with the 3rd group of resistance (R3), simultaneously by shorting switch 3(K3) and be connected in therebetween, the corresponding connection of three resistance head ends by three resistance tail ends of the 3rd group of resistance (R3) with the 4th group of resistance (R4), simultaneously by shorting switch 4(K4) and be connected in therebetween, 3 resistance tail ends of the 4th group of resistance (R4) are connected into asterism, speed probe (4) is arranged on the brush holder of main motor (M) rotor, the power supply of speed probe (4) and Xin line are connected with controller (2), the upper termination AC220V power supply of controller power source switch (3), controller power source switch (3) lower end is connected with controller (2), controller (2) receives the rotating speed Xin breath of speed probe (4) input, carry out No. Xin and amplify programming, corresponding to main motor (M), determine rated speed, work out four programs, control respectively shorting switch 1(K1), shorting switch 2(K2), meet switch 3(K3), meeting switch 4(K4) four shorting switchs disconnect or closed in good time, to regulate resistance value and the power consumption in motor rotor current circuit, and the starting of restrictions motor or overload current, the starting of increasing motor or operation torque.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310124276.6A CN104104302A (en) | 2013-04-11 | 2013-04-11 | Automatic control device capable of reducing speed, increasing torque and limiting current of electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310124276.6A CN104104302A (en) | 2013-04-11 | 2013-04-11 | Automatic control device capable of reducing speed, increasing torque and limiting current of electric motor |
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| Publication Number | Publication Date |
|---|---|
| CN104104302A true CN104104302A (en) | 2014-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310124276.6A Pending CN104104302A (en) | 2013-04-11 | 2013-04-11 | Automatic control device capable of reducing speed, increasing torque and limiting current of electric motor |
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| Country | Link |
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| CN (1) | CN104104302A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429557A (en) * | 2015-12-01 | 2016-03-23 | 北京赛思亿电气科技有限公司 | Brushless double-feed motor-based variable frequency speed regulation system |
| CN106655899A (en) * | 2016-09-21 | 2017-05-10 | 河北华北柴油机有限责任公司 | Starter motor current limiting starter and control method thereof |
-
2013
- 2013-04-11 CN CN201310124276.6A patent/CN104104302A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429557A (en) * | 2015-12-01 | 2016-03-23 | 北京赛思亿电气科技有限公司 | Brushless double-feed motor-based variable frequency speed regulation system |
| CN106655899A (en) * | 2016-09-21 | 2017-05-10 | 河北华北柴油机有限责任公司 | Starter motor current limiting starter and control method thereof |
| CN106655899B (en) * | 2016-09-21 | 2019-09-03 | 河北华北柴油机有限责任公司 | Start motor current-limiting starter and its control method |
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Application publication date: 20141015 |