CN201278499Y - Dual frequency motor control apparatus - Google Patents
Dual frequency motor control apparatus Download PDFInfo
- Publication number
- CN201278499Y CN201278499Y CNU2008201525524U CN200820152552U CN201278499Y CN 201278499 Y CN201278499 Y CN 201278499Y CN U2008201525524 U CNU2008201525524 U CN U2008201525524U CN 200820152552 U CN200820152552 U CN 200820152552U CN 201278499 Y CN201278499 Y CN 201278499Y
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- motor
- frequency converter
- frequency
- auxiliary motor
- differential mechanism
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Abstract
The utility model provides a double frequency conversion motor control device comprising a main motor which is supplied with power by a power supply, an auxiliary motor provided with an output shaft, a first frequency converter for controlling the rotation speed of the main motor, and a second frequency converter for controlling the rotation speed of the auxiliary motor. The main motor drives a rotating drum to rotate through a first belt pulley; a differential mechanism is fixed on the rotating drum; the auxiliary motor drives the input shaft of the differential mechanism through a second belt pulley; the output shaft of the differential mechanism drives a rotor to rotate; a torque transducer is arranged on the output shaft of the auxiliary motor; and a PID regulator forms a closed-loop PID control system with the second frequency converter, the auxiliary motor, the torque transducer and a torque meter. Utilizing the closed-loop PID control system, the utility model solves the problem of resistance radiation caused by energy feedback, reduces the consumption of power energy and improves the control performance of a double frequency conversion motor and the dehydration treatment effect of a centrifuge.
Description
Technical field
The utility model relates to a kind of motor control assembly, and particularly relevant for a kind of pair of variable-frequency motor control device.
Background technology
In municipal wastewater is handled, cause secondary pollution for avoiding sewage to produce mud, Treatment of Sludge be manipulated so for a very important ring.Along with updating of municipal wastewater treatment process, increasing municipal sewage plant saves sludge concentration tank in order to save floor space, the low concentration precipitating sludge of municipal sewage after aeration is handled directly carried out thickening with screw pump input horizontal screw centrifuge.
The control of dual frequency converter differential is the important form that horizontal screw centrifuge is realized differential control, though this control mode can overcome the traditional mechanical differential mechanism will be changed belt when realizing differential control problem, it is found that in actual use in use still there are two problems in this dual frequency converter differential adjuster.
At first; dual frequency converter differential adjuster must solve the subsidiary engine energy feedback problem when braking; otherwise frequency converter is because the continuous increase of pump up voltage; the frequency converter shutdown of will soon reporting to the police; solution to this problem can adopt the power consumption device (energy consumption resistance) that adds frequency converter; but this method cost is too high, efficient reduces, and the method for energy consumption resistance can only be when shutting down the short time use, resistance can very fast heating burnout during long-time running.
Secondly, in the control problem that also relates to permanent moment of torsion and permanent differential in service of centrifuge, keep certain moment of torsion very important, under a high operation torque for horizontal screw centrifuge, can guarantee has a high extruding force to separator, guarantees the suitable mass dryness fraction of separated object; Same when centrifuge move the certain differential of maintenance also very important, the setting of differential is suitable, though the too big treating capacity of differential can increase, the mass dryness fraction of separator can not guarantee, the mass dryness fraction of the too little separator of differential increases, but blocks up machine again easily and cause reducing for the treatment of capacity; In addition, when the concentration of centrifuge separator increases,, also can cause stifled machine accident because the variation of load can make the differential of centrifuge reduce.
Therefore, the selection of the control method of two variable-frequency motors and Control System Design are the keys that addresses the above problem.
The utility model content
The utility model provides a kind of pair of variable-frequency motor control device, and it takes the PID closed-loop control to moment of torsion.
The two variable-frequency motor control device that the utility model proposes, comprise main motor by the power supply power supply, auxiliary motor with output shaft, control first frequency converter of main motor speed, second frequency converter of control auxiliary motor rotating speed, main motor drives drum rotating by first belt pulley, differential mechanism is fixed on the described rotary drum, and auxiliary motor drives the power shaft of differential mechanism by second belt pulley, the output shaft of differential mechanism drives the rotor rotation, torque sensor is installed on the output shaft of auxiliary motor, the PID adjuster and second frequency converter, auxiliary motor, torque sensor, torque meter, form a closed loop PID control system.
The utility model utilizes the PID closed-loop control system to solve the resistance heating problem that the energy feedback causes, and consumption that again can saves energy; Can improve simultaneously the control performance of two variable-frequency motors and the processed effect of centrifuge again.
For above-mentioned feature and advantage of the present utility model can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Figure 1 shows that two variable frequency control structural representations of an embodiment of the utility model.
Figure 2 shows that two frequency conversion major loop winding diagrams of an embodiment of the utility model.
Figure 3 shows that the open loop step response curve figure of the controlled device of an embodiment of the utility model.
Figure 4 shows that the PID controller parameter table of adjusting.
Embodiment
In order more to understand technology contents of the present utility model, especially exemplified by specific embodiment and cooperate appended graphic being described as follows.
Figure 1 shows that two variable frequency control structural representations of an embodiment of the utility model.Two variable-frequency motor control device comprise the main motor by the power supply power supply among Fig. 1, auxiliary motor with output shaft, control first frequency converter of main motor speed, second frequency converter of control auxiliary motor rotating speed, main motor drives drum rotating by first belt pulley, differential mechanism is fixed in (differential mechanism and rotary drum are with speed) on the described rotary drum, and auxiliary motor drives the power shaft of differential mechanism by second belt pulley, the output shaft of differential mechanism drives the rotor rotation, direction of rotation as shown in FIG., torque sensor is installed on the output shaft of auxiliary motor, the PID adjuster and second frequency converter, auxiliary motor, torque sensor, torque meter, form a closed loop PID control system.The speed ratio i=1/87 of differential mechanism.Rotary drum rotation speed n 1, differential mechanism power shaft rotating speed n2, and differential n between rotary drum and rotor, triadic relation are n=(n1-n2)/87.In addition, holes probe is installed on the described rotary drum, and the 2nd PID adjuster forms a closed loop PID control system with second frequency converter, auxiliary motor, holes probe, velocity metre.PID regulates and is finished by Programmable Logic Controller (PLC).
Figure 2 shows that two frequency conversion major loop winding diagrams of an embodiment of the utility model.The main frame frequency converter is linked to each other the main frame frequency changer direct current bus by the power supply of 380V power supply among Fig. 2 with the subsidiary engine frequency changer direct current bus, and the subsidiary engine frequency converter does not connect the 380V power supply.When normal operation, auxiliary motor converts mechanical energy to electric energy, by the subsidiary engine frequency converter regenerated energy is fed back on the dc bus of frequency converter, finishes the recovery of energy.
Disclosed pair of variable-frequency motor control device of the utility model, under permanent moment of torsion control mode, the moment of torsion instantaneous value offers the analog quantity input module of PLC by torque meter in the mode of 4-20mA electric current, after the A/D conversion as the feedback quantity (as shown in Figure 1) of pid algorithm.If since disturbance, torque ratio set point height, adjust relation: moment of torsion ↑ → the PID controlled quentity controlled variable ↓ → the subsidiary engine frequency converter frequency ↓ → the auxiliary motor rotating speed ↓ → differential ↑ → moment of torsion ↓, make moment of torsion close thus to the set point direction, error reduces; Otherwise the torque ratio set point is low, adjusts relation: moment of torsion ↓ → the PID controlled quentity controlled variable ↑ → the subsidiary engine frequency converter frequency ↑ → the auxiliary motor rotating speed ↑ → differential ↓ → moment of torsion ↑, moment of torsion is close to the set point direction, and error reduces.
Disclosed pair of variable-frequency motor control device of the utility model, under permanent differential control mode, actual differential value offers the analog quantity input module of PLC by velocity metre in the mode of 4-20mA electric current, after the A/D conversion as the feedback quantity (as shown in Figure 1) of PID computing.If because disturbance, differential n adjusts relation than set point height: differential n ↑ → the PID controlled quentity controlled variable ↓ → the controlled quentity controlled variable reverse process ↑ → the auxiliary motor frequency converter frequency ↑ → the auxiliary motor rotating speed ↑ → differential n ↓, make differential close thus to the set point direction, error reduces; Otherwise differential n is lower than set point, adjusts relation: differential n ↓ → the PID controlled quentity controlled variable ↑ → the controlled quentity controlled variable reverse process ↓ → the auxiliary motor frequency converter frequency ↓ → the auxiliary motor rotating speed ↓ → differential n ↑, differential is close to the set point direction, and error reduces.
Disclosed pair of variable-frequency motor control device of the utility model, choosing of its PID controller coefficient and time constant is as follows:
The output expression formula of analog quantity PID controller is
The input variable of formula middle controller (error signal) ev (t)=sp (t)-pv (t), sp (t) is a set point, pv (t) is process variables (feedback quantity); Mv (t) is the output signal of controller, and Kp is a proportionality coefficient, and TI and TD are respectively integration time constant and derivative time constant, and M is the initial value of integral part.
Setting method: theoretically, same control effect can have not parameter setting on the same group.Usually, selecting parametric procedure is under the situation of open loop, make proportional gain KP=1, record the curve of ascending to heaven of controlled device, promptly add a given signal of step at input, draw the open loop step response curve (as shown in Figure 3) of controlled device, the figure bend is the tangent line of drawing according to the greatest gradient place of curve, it intersects with time shaft and steady-state quantity c (∞) respectively, tries to achieve pure lag time of the τ and rise-time constant TI of controlled device according to two intersection points.Determine degree of control then.So-called degree of control is meant the ratio of computer Direct Digital control (being called for short DDC) and analog quantity control effect.Generally represent, promptly with following formula
When degree of control is 1.05, can think that the two control effect is suitable.According to pure lag time of τ, rise-time constant TI and the degree of control selection relevant parameters of can tabling look-up.Parameter list as shown in Figure 4.
Wherein TS is the sampling period, and TS is the smaller the better in theory, but can increase the computing workload of CPU, so should not be too little.
Select the parameter can more several groups of parameters, parameter be as the initial value of controller preferably to select wherein one group, and fine setting on this basis later on is till satisfaction.
Though the utility model discloses as above with preferred embodiment; right its is not in order to limit the utility model; have in the technical field under any and know the knowledgeable usually; in not breaking away from spirit and scope of the present utility model; when doing a little change and retouching, therefore protection range of the present utility model is as the criterion when looking claims person of defining.
Claims (5)
1. a two variable-frequency motor control device is characterized in that, comprises
Main motor is powered by power supply;
Auxiliary motor comprises an output shaft;
First frequency converter is controlled main rotating speed of motor;
Second frequency converter, the rotating speed of control auxiliary motor;
Rotary drum, wherein main motor drives described drum rotating by first belt pulley;
Differential mechanism comprises power shaft and output shaft, be fixed on the described rotary drum, and auxiliary motor drives the power shaft of differential mechanism by second belt pulley;
Rotor, wherein the output shaft of differential mechanism drives the rotor rotation;
Torque sensor is installed on the output shaft of auxiliary motor;
The one PID adjuster forms a closed loop PID control system with second frequency converter, auxiliary motor, torque sensor, torque meter.
2. according to claim 1 pair of variable-frequency motor control device is characterized in that, also comprises
Holes probe is installed on the described rotary drum;
The 2nd PID adjuster forms a closed loop PID control system with second frequency converter, auxiliary motor, holes probe, velocity metre.
3. according to claim 1 pair of variable-frequency motor control device is characterized in that, described PID regulates and finished by Programmable Logic Controller.
4. according to claim 1 pair of variable-frequency motor control device is characterized in that, the speed ratio i=1/87 of differential mechanism, differential between rotary drum and rotor=(rotary drum rotating speed-differential mechanism power shaft rotating speed)/87.
5. according to claim 1 pair of variable-frequency motor control device is characterized in that, the main frame frequency converter is linked to each other the main frame frequency changer direct current bus by the power supply of 380V power supply with the subsidiary engine frequency changer direct current bus, and the subsidiary engine frequency converter does not connect the 380V power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201525524U CN201278499Y (en) | 2008-08-29 | 2008-08-29 | Dual frequency motor control apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201525524U CN201278499Y (en) | 2008-08-29 | 2008-08-29 | Dual frequency motor control apparatus |
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| CN201278499Y true CN201278499Y (en) | 2009-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008201525524U Expired - Fee Related CN201278499Y (en) | 2008-08-29 | 2008-08-29 | Dual frequency motor control apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769417A (en) * | 2012-08-06 | 2012-11-07 | 中联重科物料输送设备有限公司 | Method and device for controlling multi-motor variable-frequency drive of belt conveyor |
| CN102901341A (en) * | 2012-09-29 | 2013-01-30 | 宝鸡石油机械有限责任公司 | Vertical rock debris drying machine driven by variable frequency motor |
| CN107051759A (en) * | 2017-06-19 | 2017-08-18 | 苏州市职业大学 | Horizontal screw centrifuge control system |
| CN110109395A (en) * | 2019-05-08 | 2019-08-09 | 广东电网有限责任公司 | A kind of acquisition methods, device, equipment and the storage medium of the frequency bandwidth of process |
-
2008
- 2008-08-29 CN CNU2008201525524U patent/CN201278499Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769417A (en) * | 2012-08-06 | 2012-11-07 | 中联重科物料输送设备有限公司 | Method and device for controlling multi-motor variable-frequency drive of belt conveyor |
| CN102769417B (en) * | 2012-08-06 | 2014-12-24 | 中联重科物料输送设备有限公司 | Method and device for controlling multi-motor variable-frequency drive of belt conveyor |
| CN102901341A (en) * | 2012-09-29 | 2013-01-30 | 宝鸡石油机械有限责任公司 | Vertical rock debris drying machine driven by variable frequency motor |
| CN107051759A (en) * | 2017-06-19 | 2017-08-18 | 苏州市职业大学 | Horizontal screw centrifuge control system |
| CN110109395A (en) * | 2019-05-08 | 2019-08-09 | 广东电网有限责任公司 | A kind of acquisition methods, device, equipment and the storage medium of the frequency bandwidth of process |
| CN110109395B (en) * | 2019-05-08 | 2021-08-24 | 广东电网有限责任公司 | Method, device, equipment and storage medium for acquiring frequency bandwidth of process |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Shanghai City 200233 Tianzhou Road No. 99 new Mao Building 7 West Co-patentee after: Shanghai Huiqiao Electrical Control Engineering Co., Ltd. Patentee after: Shanghai WitJoint Automation Co., Ltd. Address before: Shanghai City 200233 Tianzhou Road No. 99 new Mao Building 7 West Co-patentee before: Shanghai KnowHow Electric Control Engineering Co., Ltd. Patentee before: Shanghai WitJoint Automation Co., Ltd. |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090722 Termination date: 20130829 |