CN2420305Y - Electrisity saving protector for sewing machine - Google Patents
Electrisity saving protector for sewing machine Download PDFInfo
- Publication number
- CN2420305Y CN2420305Y CN 00228228 CN00228228U CN2420305Y CN 2420305 Y CN2420305 Y CN 2420305Y CN 00228228 CN00228228 CN 00228228 CN 00228228 U CN00228228 U CN 00228228U CN 2420305 Y CN2420305 Y CN 2420305Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- output
- control
- overload
- triode
- 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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- Protection Of Generators And Motors (AREA)
Abstract
The utility model relates to an electricity saving protector for a sewing machine. The working current of the existing electric sewing machine is big when the existing electric sewing machine is under zero load or light load. Therefore, the loss due to the zero load is big. The utility model is composed of a thyristor switching circuit, a sampling feedback circuit, a gate trigger circuit and an overload protection circuit. The utility model is characterized in that the sampling feedback circuit comprises a current mutual inductor. An integrating circuit provides the gate trigger circuit with feedback signals through a bridge controlled by a transistor which is under control. The thyristor switching circuit and an alarm are controlled by contacts of a relay which is controlled by an overload switch transistor. The utility model has the advantages of stable operation and reliable control.
Description
The utility model belongs to a kind of Sewing machines electricity-saving protection device.
Following of electric sewer Light Condition needs 20～30% of rated current, and following need 40～60% of light condition can be in actual motion, the operating current when its zero load, underloading during but with heavy duty difference little, cause the sky loss bigger, the motor feels hot.
The utility model aims to provide a kind of can control automatically and reduces empty loss, and overload protective function is arranged again, and the Sewing machines electricity-saving protection device of reliable operation.
The technical scheme that realizes above-mentioned purpose is (referring to square frame principle Fig. 1 and embodiment Fig. 2): this device is provided with the reverse-blocking tetrode thyristor circuit (1) that is connected between power supply and the sewing machine electromotor; join with motor load the circuit sampling feedback circuit (4) that joins and the control utmost point circuits for triggering (2) and the overload protecting circuit (3) that are connected in the SCR control polar circuit; it is characterized in that: described sampling feedback circuit structure is series connection one current transformer (L in the motor load circuit
1), the secondary control sample coil (L that is provided with of instrument transformer
11) and overload sample coil (L
12), control sample coil (L
11) output is connected to commutation diode (D
2) and by (C
4), (R
7) integrating circuit formed, integrating circuit one output is in series with control triode (Q
1), another output of integrating circuit is by voltage-stabiliser tube (D
1) connect the base stage that controls triode, by (D
12)～(D
14) electric bridge (T that forms
1) input is connected on control transistor emitter and colelctor electrode two ends, electric bridge output termination control utmost point circuits for triggering (2), described overload sample coil (L
12) output is in series with commutation diode (D
3), and be parallel with by (C
5), (R
9) integrating circuit formed, integrating circuit one output is in series with overload cut-out triode (Q
2), another output is by voltage-stabiliser tube (D
4) take over load switch triode (Q
2) base stage, overload cut-out transistor emitter and colelctor electrode are taken over and are carried holding circuit.
Operation principle of the present utility model is: when motor work is in Light Condition, and control sample coil (L
11) electric current got becomes to subtracting voltage-stabiliser tube (D
1) not conducting, control triode (Q
1) carry and end electric bridge (T
1) no current passes through, controllable silicon is kept low angle of flow unskilled labourer and is made current status under its control triggering electric circuit effect, and when motor was in underloading or heavy duty, operating current became greatly, voltage-stabiliser tube (D
1) conducting, control triode (Q
1) also conducting, the electric current by it also changes with the variation of operating current simultaneously, electric bridge (T
1) also change to the electric current of control utmost point circuits for triggering (2) output, thereby change the silicon controlled angle of flow, adapt to the variation of the required increasing operating current of load.When the motor operating current transships, overload sample coil (L
12) make voltage-stabiliser tube (D
4) conducting, overload cut-out triode (Q
2) conducting, for overload protecting circuit provides shutoff silicon controlled signal.Integrating circuit wherein plays time-lag action.
Integrating circuit in the utility model sampling feedback circuit can provide stable ON time for the control triode; simultaneously when electric motor starting produces of short duration overcurrent; can not send the mistake control signal to overload protecting circuit; adopt electric bridge to provide the circuit structure of controlling electric current in addition, improved the stability and the reliability of single unit system work to control utmost point circuits for triggering with the control of direct current triode.
Description of drawings:
Fig. 1, the utility model operation principle block diagram
Fig. 2, the utility model embodiment sampling feedback circuit 4 circuit diagrams
Fig. 3, the utility model embodiment integrated circuit figure
The embodiment explanation:
These routine sampling feedback circuit 4 structures are: be in series with current transformer L in the motor load circuit
1, the secondary control sample coil L that is provided with of instrument transformer
11And overload sample coil L
12, control sample coil L
11Output is connected to commutation diode D
2And be parallel with by C
4, R
7The integrating circuit of forming, integrating circuit one output are in series with control triode Q
1, another output of integrating circuit is by voltage-stabiliser tube D
1Meet control triode Q
1Base stage, by D
12～D
14The electric bridge T that forms
1Input is connected on control transistor emitter and colelctor electrode two ends, electric bridge output termination control utmost point circuits for triggering 2, described overload sample coil L
12Output is in series with commutation diode D
3, and be parallel with by C
5, R
9The integrating circuit of forming, integrating circuit one output is in series with overload cut-out triode Q
2, another output is by voltage-stabiliser tube D
4Take over load switch triode Q
2Base stage, overload cut-out transistor emitter and colelctor electrode are taken over and are carried holding circuit.
The reverse-blocking tetrode thyristor circuit 1 that this example is connected in the motor load circuit is made up of bidirectional triode thyristor TRIAC, and its control utmost point circuits for triggering 2 are by RV
1, R
3, C
3, R
16, R
17C
11The charging circuit of forming; The electric bridge T of described sampling feedback circuit
1Output termination control utmost point circuits for triggering charging capacitor C
3
When motor is unloaded, sampling feedback circuit electric bridge T
1No-output, the charging capacitor C of control utmost point circuits for triggering
3Charging current is little, and the bidirectional triode thyristor pipe angle of flow is in minimum state, to keep motor rotation; When motor underloading or heavy duty make operating current become big, the electric bridge T of sampling feedback circuit
1The output current resistance increases thereupon, changes charging capacitor C
3Charging interval, reach the change thyristor operating angle, the purpose of corresponding increase operating current.
When the motor operating current transships, the overload cut-out triode Q of sampling feedback circuit
2Conducting, the IC of startup overload protecting circuit
1Work, gauge tap triode Q
3Conducting, relay J
1Conducting, its contact J
11Closure, buzzer BELL reports to the police, another contact J
12Closure is with the charging capacitor C of control utmost point circuits for triggering
3Two terminal shortcircuits, thyristor turn-offs, and plays the effect of protection motor.
Claims (1)
1, Sewing machines electricity-saving protection device; this device is provided with the reverse-blocking tetrode thyristor circuit (1) that is connected between power supply and the sewing machine electromotor; join with motor load the circuit sampling feedback circuit (4) that joins and the control utmost point circuits for triggering (2) and the overload protecting circuit (3) that are connected in the SCR control polar circuit; it is characterized in that: described sampling feedback circuit structure is series connection one current transformer (L in the motor load circuit
1), the secondary control sample coil (L that is provided with of instrument transformer
11) and overload sample coil (L
12), control sample coil (L
11) output is connected to commutation diode (D
2) and by (C
4), (R
7) integrating circuit formed, integrating circuit one output is in series with control triode (Q
1), another output of integrating circuit is by voltage-stabiliser tube (D
1) connect the base stage that controls triode, by (D
12)～(D
14) electric bridge (T that forms
1) input is connected on control transistor emitter and colelctor electrode two ends, electric bridge output termination control utmost point circuits for triggering (2), described overload sample coil (L
12) output is in series with commutation diode (D
3), and be parallel with by (C
5), (R
9) integrating circuit formed, integrating circuit one output is in series with overload cut-out triode (Q
2), another output is by voltage-stabiliser tube (D
4) take over load switch triode (Q
2) base stage, overload cut-out transistor emitter and colelctor electrode are taken over and are carried holding circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00228228 CN2420305Y (en) | 2000-05-23 | 2000-05-23 | Electrisity saving protector for sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00228228 CN2420305Y (en) | 2000-05-23 | 2000-05-23 | Electrisity saving protector for sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2420305Y true CN2420305Y (en) | 2001-02-21 |
Family
ID=33591731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00228228 Expired - Fee Related CN2420305Y (en) | 2000-05-23 | 2000-05-23 | Electrisity saving protector for sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2420305Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105734854A (en) * | 2016-05-18 | 2016-07-06 | 天津市中马骏腾精密机械制造有限公司 | Overvoltage and overcurrent protection system of sewing equipment |
-
2000
- 2000-05-23 CN CN 00228228 patent/CN2420305Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105734854A (en) * | 2016-05-18 | 2016-07-06 | 天津市中马骏腾精密机械制造有限公司 | Overvoltage and overcurrent protection system of sewing equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Zhang Yongtao Document name: Notification of Termination of Patent Right |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20010221 Termination date: 20090623 |