CN2122450U - Contactless computerized starter for motor - Google Patents
Contactless computerized starter for motor Download PDFInfo
- Publication number
- CN2122450U CN2122450U CN 92208916 CN92208916U CN2122450U CN 2122450 U CN2122450 U CN 2122450U CN 92208916 CN92208916 CN 92208916 CN 92208916 U CN92208916 U CN 92208916U CN 2122450 U CN2122450 U CN 2122450U
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- motor
- voltage
- contactless
- starter
- chip microcomputer
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Abstract
The utility model relates to a contactless computerized starter for a motor. The contactless computerized starter for a motor mainly makes use of a single-chip microcomputer and a thyristor to start the motor and control the supply voltage to reduce the active loss and the reactive power loss. The contactless computerized starter for a motor is mainly composed of the single-chip microcomputer, the thyristor serially connected between a three phase power supply and the motor, a current and voltage sampling circuit, a pulse triggering control circuit and an acoustic-optic alarm circuit. The contactless computerized starter for the motor also has an under-voltage protective function, an over-voltage protective function, an over-current protective function and a phase failure protective function. The contactless computerized starter for a motor has an electricity-saving function when the motor starts and runs, and the contactless computerized starter for the motor has various protective functions. The contactless computerized starter for the motor can extend the service life of the motor and is suitable for various AC electric motors.
Description
The utility model relates to a kind of starting device of motor, mainly is to utilize single-chip microcomputer, scr promoter motor and control supply power voltage, to reduce the meritorious and reactive loss of motor.It is applicable to alternating current motor.
Existing motor starter, it as the disclosed a kind of application number of Chinese utility model patent the starting device of 88208532 controllable silicon formula induction motor, it mainly is by the normally opened contact that is serially connected in the A.C. contactor in the motor three-phase major loop, with normally opened contact mutually and the controllable silicon that connects, the logical transition circuit of control motor starting and stopped process, phase shift trigger impulse control unit and acceleration restriction delay circuit are formed, though this starter has utilized the silicon controlled controllability, make induction motor according to the level and smooth slow start of certain rule, but it also has the following disadvantages: can not change from the motion tracking motor load during operation, realize the operation economize on electricity, this starter still utilizes the switching of realization circuit such as A.C. contactor simultaneously, consumed energy not only, and reliability is relatively poor.
It is 89202490 motor energy-saving controller that China's utility model also discloses a kind of application number; it has contactless voltage-regulating and starts, changes from the motion tracking motor load; and various defencive functions; its deficiency is: circuit adopts discrete component to constitute; therefore the circuit structure more complicated influences reliability of products.
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, provide a kind of single-chip microcomputer and control program of utilizing to realize the motor soft start, change and adjust terminal voltage of motor continuously from the motion tracking motor load, to improve the starter of motor power (output) factor.It also has various defencive functions simultaneously.
The purpose of this utility model is achieved in that utilizes the Single-chip Controlling starting resistor to rise by certain ramp rate, realizes soft start; Detect motor load in real time and change, adjust the terminal voltage of motor automatically, reduce the meritorious and reactive loss of motor.Concrete technical solution is: motor is contactless, and computer festival computer festival electric starter is by voltage, current sampling circuit, single-chip microcomputer, program storage, pulsed triggering circuit, controllable silicon, power supply constitutes, voltage, the voltage and current signal that current sampling circuit will be searched from the silicon controlled two ends that are serially connected between three phase mains and the motor is that the phase difference of voltage and electric current is sent in the single-chip microcomputer, undertaken calculating the silicon controlled optimal open angle after the data processing by it, and send control signal, through the pulse circuits for triggering controllable silicon trigger electrode is carried out control, to regulate the terminal voltage of motor, make it be in optimal operational condition.
The soft start of motor is to realize by the control signal that certain ramp rate changes by Single Chip Microcomputer (SCM) program control output, owing to adopt the Starting mode that strengthens motor stator voltage gradually, not only can significantly reduce starting current, but also do not influence staring torque, reach the purpose that starts economize on electricity, on input of single chip, connect the startup speed selector switch, access the different control programs that start speed.Toggle speed is generally selected voluntarily according to motor institute bringing onto load situation.
The utility model also comprises current foldback circuit, overvoltage crowbar, under-voltage protecting circuit; when wherein any one phenomenon takes place; foregoing circuit will send the signal of telecommunication and give single-chip microcomputer; single-chip microcomputer is with the locking output; pulsed triggering circuit does not have triggering signal output; controllable silicon is disconnected, the protection motor.Singlechip has zero passage and interrupts defencive function.
The utility model compared with prior art has following characteristics:
1. utilize single-chip microcomputer to monitor load that motor is with in real time, regulate terminal voltage of motor automatically, make be input to power of electric motor with load variations respective change, realize motor operation economize on electricity.
2. have contactless low pressure soft start function, starting resistor is risen by certain ramp rate, promptly reduced starting current, do not influence starting torque again.Realized starting economize on electricity.
3. because terminal voltage of motor changes with load change, therefore can reduce magnetizing current, reduce the idle thermal losses of motor, promptly the iron loss copper loss of motor has avoided the thermal reactor collection effect of idle thermal losses to damage motor, has prolonged the useful life of motor.
4. have defencive functions such as over-and under-voltage, overcurrent, the phase failure, and can in time send the sound and light alarm signal, guarantee that motor safety moves reliably.
The computer festival electric starter simple in structure, whole aircraft reliability is high, electric energy is remarkable, generally meritorious power saving rate is 10～20%, idle power saving rate is 20～30%.
Fig. 1 is a frame principle figure of the present utility model.
Fig. 2 is a circuit diagram of the present utility model.
Be described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1, the utility model is mainly by single-chip microcomputer, voltage, current sampling circuit, pulsed triggering circuit, controllable silicon, overvoltage, under-voltage protecting circuit, current foldback circuit, and sound light alarming circuit, power supply constitute.
Fig. 2 has provided a kind of concrete enforcement circuit diagram, single-chip microcomputer IC
1What adopt is the 68705P3 single-chip microcomputer that inside has EPROM, RAM eight bit timings/counter and 7 pre-selected proportion devices able to programme.
Be serially connected in controllable silicon between three phase mains and the motor and can adopt the one-way SCR of bidirectional triode thyristor or two reverse parallel connections, preferably adopt the latter.
Power supply is made up of two parts, and a part is made of transformer, current rectifying and wave filtering circuit, voltage stabilizing circuit, and output is not with the stabilization signal of grid voltage change, for each circuit provides reference power supply.Another part is made up of transformer, current rectifying and wave filtering circuit, and output is with grid voltage change, and it provides contrast signal for overvoltage, under-voltage protecting circuit.The input of power supply is connected on the B, C phase line of three phase mains.
Voltage sampling circuit is by divider resistance R
14, R
12, R
10Constitute with the limiter diode of two reverse parallel connections, its input is connected with three phase mains A phase line.It is the silicon controlled input.Output links to each other with single-chip microcomputer 11 pin, and line voltage is sent in the single-chip microcomputer.Present embodiment only need be provided with a voltage sampling circuit, and it will compare the hysteretic state of electric current respectively with three current sampling circuits.
Article three, the current sampling circuit that structure is identical is used for searching the input current signal of three phase mains A phase, B phase, C phase respectively.This sentences A phase current sampling circuit is that example is illustrated.A phase current sampling circuit is by photoisolator IC
2, IC
3Constitute, the input of two photoisolators is that A, A end is connected with the silicon controlled input/output terminal, and output is connected with 8 pin of single-chip microcomputer.This circuit optocoupler when the controllable silicon conducting is in cut-off state, is output as high level, at controllable silicon when cut-off state changes, its both end voltage will be with mains voltage variations, when it is higher than the light-emitting diode conducting voltage, the optocoupler conducting, this circuit is with output low level.The voltage square wave of this circuit output end has just been represented the square wave of A phase current break-make, as long as its voltage square wave with the voltage sampling circuit output is compared, just can obtain the phase difference of A phase current and voltage.In like manner, the voltage square wave of B, the output of C phase current sampling circuit is compared with the voltage square wave of voltage sampling circuit output, can obtain the phase difference of B phase, C phase current and voltage, i.e. the ψ angle of power factor.
Pulsed triggering circuit mainly is to be made of transistor, pulse transformer.With A phase pulsed triggering circuit is example, is illustrated.It is by transistor BG
1, BG
2The inductance coil L of transformer
1, L
2, L
3Form, its input is accepted the control signal from single-chip microcomputer 12 pin, and output links to each other with the silicon controlled trigger electrode, the control silicon controlled angle of flow.B, home pulse circuits for triggering are identical with A circuitry phase structure.Accept control signal respectively, three pulsed triggering circuit synchronous workings from single-chip microcomputer 13,14 pin.
Overvoltage crowbar and under-voltage protecting circuit are respectively by voltage comparator ic
8, IC
9Constitute.IC
8, IC
9Negative input end provide the signal of telecommunication by the power supply that changes with electrical network, positive input terminal then provides the signal of telecommunication by the power supply of output constant voltage.Output links to each other with single-chip microcomputer 26,27 pin respectively.When electrical network generation overvoltage, when under-voltage, the voltage comparator upset, output low level, when single-chip microcomputer was received this signal, the locking output disconnected controllable silicon.Send sound and light alarm simultaneously.
Current foldback circuit mainly is by current transformer, current rectifying and wave filtering circuit, voltage comparator ic
10, IC
11, transistor BG
7Deng composition.Current transformer is searched current signal on each phase line is delivered to the voltage comparator of two serial connections behind rectifying and wave-filtering input, and the output of voltage comparator links to each other with single-chip microcomputer 19 pin.When overcurrent appears in electrical network, this circuit output low level, single-chip microcomputer is received locking output behind this signal, disconnects controllable silicon, and the protection motor is not burnt, and sends sound and light alarm simultaneously.Itself has phase failure protection function single-chip microcomputer.
On single-chip microcomputer 23,24 pin, be connected with and start speed selector switch K
2, it is two sensitive switches, by the combination of two-position switch, and 00,01,10,11, can make four kinds of different control signals that start speed of single-chip microcomputer output.Toggle speed can be selected according to the load-carrying weight of motor.
During work, connect three phase mains, the relay indicating light indication, this moment, single-chip microcomputer was not worked, and the terminal voltage on the motor is 0, connects the operating switch CH of single-chip microcomputer behind the adjustment toggle speed selector switch
6, motor will start speed by the slope of presetting in advance and start, and when terminal voltage of motor and line voltage were basic identical, motor start-up finished.After this single-chip microcomputer will go the rounds to detect the phase difference of A phase voltage and each phase current, and per second detects 100 times, after single-chip data is handled, and the output control signal, the terminal voltage of regulating motor makes it be in optimal operational condition.Realize starting, move economize on electricity control.
Claims (4)
1, a kind of motor is contactless computer festival electric starter, it is characterized in that it is by voltage, current sampling circuit, single-chip microcomputer, program storage, pulsed triggering circuit, controllable silicon, power supply constitutes, voltage, current sampling circuit will be searched voltage from the silicon controlled two ends that are serially connected between three phase mains and the motor, current signal is that the phase difference of voltage and electric current is sent in the single-chip microcomputer, undertaken calculating the silicon controlled optimal open angle after the data processing by it, and send control signal, through the pulse circuits for triggering controllable silicon trigger electrode is carried out control, to regulate the terminal voltage of motor.
2, the contactless computer festival electric starter of motor according to claim 1, the soft start that it is characterized in that motor are to realize by the control signal that certain ramp rate changes by Single Chip Microcomputer (SCM) program control output.
3, the contactless computer festival electric starter of motor according to claim 1 is characterized in that being connected with the startup speed selector switch on input of single chip, by importing different signals, calls toggle speed control program on the other side.
4, the contactless computer festival electric starter of motor according to claim 1; it is characterized in that it also has overvoltage crowbar, under-voltage protecting circuit, current foldback circuit; when wherein any phenomenon takes place; foregoing circuit sends the signal of telecommunication and gives single-chip microcomputer; single-chip microcomputer disconnects controllable silicon with the locking output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92208916 CN2122450U (en) | 1992-04-30 | 1992-04-30 | Contactless computerized starter for motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92208916 CN2122450U (en) | 1992-04-30 | 1992-04-30 | Contactless computerized starter for motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2122450U true CN2122450U (en) | 1992-11-18 |
Family
ID=4954315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92208916 Granted CN2122450U (en) | 1992-04-30 | 1992-04-30 | Contactless computerized starter for motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2122450U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931890A (en) * | 2011-08-11 | 2013-02-13 | 周顺新 | Control system for driving a plurality of motors by using inverter bridge to change input power simultaneously along with load and rotating speed |
| CN103872648A (en) * | 2012-12-11 | 2014-06-18 | 苏州宝时得电动工具有限公司 | Overload protection method used for electric tool and circuit thereof |
| CN111034019A (en) * | 2017-08-30 | 2020-04-17 | 鲍尔齿轮电动机有限公司 | Drive device with integrated dynamic load control |
-
1992
- 1992-04-30 CN CN 92208916 patent/CN2122450U/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931890A (en) * | 2011-08-11 | 2013-02-13 | 周顺新 | Control system for driving a plurality of motors by using inverter bridge to change input power simultaneously along with load and rotating speed |
| WO2013020355A1 (en) * | 2011-08-11 | 2013-02-14 | Zhou Shunxin | A control system to realize input power changing along with both loads and rotate speed by an inverter bridge dragging many sets of motors |
| CN102931890B (en) * | 2011-08-11 | 2014-11-26 | 周顺新 | Control system for driving a plurality of motors by using inverter bridge to change input power simultaneously along with load and rotating speed |
| US9859822B2 (en) | 2011-08-11 | 2018-01-02 | Shunxin Zhou | Control system for realizing the change of input power with load and rotating speed simultaneously, by driving multiple electric motors via one inverter bridge |
| CN103872648A (en) * | 2012-12-11 | 2014-06-18 | 苏州宝时得电动工具有限公司 | Overload protection method used for electric tool and circuit thereof |
| CN111034019A (en) * | 2017-08-30 | 2020-04-17 | 鲍尔齿轮电动机有限公司 | Drive device with integrated dynamic load control |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |