CN2261110Y - Commutation control and time-sharing overload protection device for dc. servo electric-motor - Google Patents
Commutation control and time-sharing overload protection device for dc. servo electric-motor Download PDFInfo
- Publication number
- CN2261110Y CN2261110Y CN 96235534 CN96235534U CN2261110Y CN 2261110 Y CN2261110 Y CN 2261110Y CN 96235534 CN96235534 CN 96235534 CN 96235534 U CN96235534 U CN 96235534U CN 2261110 Y CN2261110 Y CN 2261110Y
- Authority
- CN
- China
- Prior art keywords
- commutation
- motor
- controllable silicon
- link
- protective device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Control Of Direct Current Motors (AREA)
Abstract
The utility model relates to a commutation control and time-sharing overload protection device for a DC servo electric-motor, wherein the commutation control is conducted by four thyristor and a plurality of commutation control switches, and the time-sharing overload protection is realized by a voltage comparator integrated circuit. The whole device has the advantages of simple circuit, reliable work and low cost. Besides, the utility model is especially suitable for time-sharing overload protection in occasions where an electric-motor is commutated frequently and the load of an electric-motor is changed greatly.
Description
The utility model relates to the commutation and the protective device of DC motor.
The protective device general utility functions of existing DC motor are all more single, commutation and timesharing overload protection can not be organically combined.And that existing communtation protection device is often worked is reliable inadequately.Action is too sensitive when promptly protecting, so that of short duration transient voltage all can make the protective device action and motor is shut down.Often require in this external real work motor under the bigger situation of duty ratio frequently the commutation, this also be present DC servo motor reversing arrangement can not finish.
It is single that the purpose of this utility model is to overcome existing servomotor defencive function; the shortcoming that work quality is not high; and provide a kind of control that can commutate can implement the device of timesharing overload protection for different overcurrent, make the commutation of DC servo motor and timesharing protection operation improve reliable more.
Solution of the present utility model is: the commutation of DC servo motor and timesharing overload protection arrangement, comprise bridge rectifier BR and relay J, and it is characterized in that:
(1) positive pole of bridge rectifier BR and commutation controllable silicon T
1And T
3Positive pole link to each other, and through reversing switch K
1-1With controllable silicon T
1Or T
3Control extremely continuous;
(2) commutation controllable silicon T
1, T
3Negative pole respectively with commutation controllable silicon T
2, T
4Positive pole link to each other T
1, T
3Negative pole and with the armature winding RS of motor
1And RS
2Link to each other;
(3) armature winding RS
1And RS
2Respectively through reversing switch K
1-2And K
1-3With commutation controllable silicon T
2And T
4Control extremely continuous;
(4) commutation controllable silicon T
2And T
4Negative pole and connect the back with current sampling resistor R
5Series connection.
Describe a kind of embodiment of the present utility model in detail below in conjunction with accompanying drawing.
Fig. 1 is the commutation of DC servo-motor and the basic circuit diagram of timesharing protective device.
Alternating current is through the upper and lower end input of bridge rectifier BR among the figure, and left and right end is exported.Wherein right-hand member is anodal, and left end is a negative pole.Direct voltage is added on the excitation winding RT of motor stator
1And RT
2On.Electric current is from commutation controllable silicon T
3Through armature RS
2And RS
1Again through commutation controllable silicon T
2Return the negative pole of bridge rectifier BR along current sampling resistor R5.If reversing switch K
1-1Be connected to the upper end, then electric current is from T
1Through RS
1And RS
2Along T
4Get back to the negative pole of BR.Like this as long as control reversing switch K
1Just can realize commutation control.Resistance R among the figure
1, R
2, R
3, R
4Be respectively controllable silicon T
1, T
2, T
3, T
4Current-limiting resistance.
Sample resistance R
5On be connected to by R
6, C
1And R
7, C
2The filter circuit of forming is in order to filtering high pressure transient signal.The comparator SC of sample resistance R5 and a plurality of different magnitudes of voltage
1, SC
2, SC
3Link to each other, the output of each voltage comparator links to each other with the time delay circuit of different time constant respectively again.As SC
1With by R
12And capacitor C
3The time delay circuit of forming links to each other or the like.Link to each other with the positive input terminal of voltage comparator MC after the output parallel connection of each time delay circuit, the output of MC then links to each other with relay J, the timesharing protection when being used for motor overload.
Actual each voltage comparator that uses can be an integrated circuit.The model of integrated circuit can be selected LM324 etc. for use.The diode D of reversal connection in parallel on the relay J
11The reverse voltage that produces when disconnecting in order to cutoff relay.R
8, R
9, R
10, R
11Be divider resistance, high more by the top reference voltage more.The comparator higher to reference voltage can be joined short time delay circuit of a time delay time; On the contrary, the comparator lower to the bottom reference voltage, can timing long time delay circuit between time-delay, so just can realize that overvoltage is big, the time of cutting off the electricity supply is just short, otherwise overvoltage is little, the time of cutting off the electricity supply is with regard to length.So just avoided because of little of short duration voltage, made electric motor protecting too sensitivity and misoperation.Diode D
5, D
7, D
9Also be used for shielding by reverse voltage.Resistance R
16, R
17Be used for providing reference voltage to voltage comparator MC.
The utility model only just can make DC servo-motor frequently commutation under the bigger situation of load variations with one than ball bearing made using.Because each comparator has different delay constants, can avoid because of little of short duration voltage, make electric motor protecting too sensitivity and misoperation.Whole in addition comparison circuit can be with an integrated circuit, so cost is low, reliable operation has very big market potential.
Claims (6)
1. the commutation control of DC servo-motor and timesharing overload protection arrangement comprise bridge rectifier BR and relay J, it is characterized in that:
(1) positive pole of bridge rectifier BR and commutation controllable silicon T
1And T
3Positive pole link to each other, and through reversing switch K
1-1With controllable silicon T
1Or T
3Control extremely continuous;
(2) commutation controllable silicon T
1, T
3Negative pole respectively with commutation controllable silicon T
2, T
4Positive pole link to each other T
1, T
3Negative pole and with the armature winding RS of motor
1And RS
2Link to each other;
(3) armature winding RS
1And RS
2Respectively through reversing switch K
1-2And K
1-3With commutation controllable silicon T
2And T
4Control extremely continuous;
(4) commutation controllable silicon T
2And T
4Negative pole and connect the back with current sampling resistor R
5Series connection.
2, protective device as claimed in claim 1 is characterized in that said sample resistance R
5On be connected to by R
6, C
1And R
7, C
2The filter circuit of forming is in order to filtering high pressure transient signal.
3, protective device as claimed in claim 1 or 2 is characterized in that said sample resistance R
5Comparator SC with a plurality of different magnitudes of voltage
1, SC
2, SC
3Link to each other; the output of each voltage comparator links to each other with the time delay circuit of different time constant respectively; link to each other with the positive input terminal of voltage comparator MC after the output parallel connection of each time delay circuit, the output of MC then links to each other with relay J, the timesharing protection when being used for motor overload.
4, protective device as claimed in claim 3 is characterized in that said each voltage comparator is an integrated circuit.
5, protective device as claimed in claim 4 is characterized in that said integrated circuit model is LM324.
6, protective device as claimed in claim 3 is characterized in that being parallel with on the said relay J diode D of reversal connection
11, the reverse voltage when disconnecting in order to cutoff relay J.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96235534 CN2261110Y (en) | 1996-01-24 | 1996-01-24 | Commutation control and time-sharing overload protection device for dc. servo electric-motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96235534 CN2261110Y (en) | 1996-01-24 | 1996-01-24 | Commutation control and time-sharing overload protection device for dc. servo electric-motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2261110Y true CN2261110Y (en) | 1997-08-27 |
Family
ID=33911551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96235534 Expired - Fee Related CN2261110Y (en) | 1996-01-24 | 1996-01-24 | Commutation control and time-sharing overload protection device for dc. servo electric-motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2261110Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074606C (en) * | 1998-12-22 | 2001-11-07 | 中国科学院电工研究所 | Protective device for DC servo system |
-
1996
- 1996-01-24 CN CN 96235534 patent/CN2261110Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074606C (en) * | 1998-12-22 | 2001-11-07 | 中国科学院电工研究所 | Protective device for DC servo system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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 |