CN212305032U - Starting switch of single-phase motor - Google Patents
Starting switch of single-phase motor Download PDFInfo
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- CN212305032U CN212305032U CN202020947584.4U CN202020947584U CN212305032U CN 212305032 U CN212305032 U CN 212305032U CN 202020947584 U CN202020947584 U CN 202020947584U CN 212305032 U CN212305032 U CN 212305032U
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- phase motor
- silicon controlled
- controlled rectifier
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Abstract
A starting switch of a single-phase motor comprises a bidirectional Silicon Controlled Rectifier (SCR), and is characterized in that a control electrode of the bidirectional Silicon Controlled Rectifier (SCR) is connected with one input end of a bridge rectifier QL through a resistor R1, the other input end of the bridge rectifier QL is connected with an anode of the bidirectional Silicon Controlled Rectifier (SCR), an output end of the bridge rectifier QL is connected with a capacitor C2 in parallel, and the anode and the cathode of the bidirectional Silicon Controlled Rectifier (SCR) are connected in a starting winding loop of the single-phase motor in series. The silicon controlled rectifier has the advantages that 1, the silicon controlled rectifier is adopted as a non-contact switch, so that the fatigue problem does not occur, and the service life can be prolonged; 2. after the motor is started, the starting winding can be ensured to be reliably disconnected, and the starting winding is prevented from being damaged due to long-time running; 3. the starting switch of the single-phase motor has two outgoing lines, the two outgoing lines are respectively led out from the anode and the cathode of the SCR, the outgoing lines are connected in series in the starting winding loop, wiring errors cannot occur (errors are easy to occur if the number of the outgoing lines is more than two), and the single-phase motor is convenient to install and replace.
Description
Technical Field
The invention relates to a starting switch of a single-phase motor.
Background
The single-phase motor is provided with a starting winding, the starting winding is put into operation when the single-phase motor is started, the starting winding is withdrawn from operation after the single-phase motor rotates, and the starting winding is controlled by a starting device; the starting device is usually a centrifugal switch, and the function of the centrifugal switch is that when the starting device is just started, the contact of the centrifugal switch is closed, and when the single-phase motor reaches a certain rotating speed, the contact of the centrifugal switch is opened. The centrifugal switch has the disadvantages that after the centrifugal switch is used for a period of time, the contact of the centrifugal switch fails due to fatigue, and in addition, as the part for inducing the rotating speed of the centrifugal switch is arranged on the rotor, the maintenance and the replacement are inconvenient.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the starting switch of the single-phase motor, which has long service life and is convenient to install.
The technical scheme is that the starting switch of the single-phase motor comprises a bidirectional Silicon Controlled Rectifier (SCR), and is characterized in that a control electrode of the bidirectional Silicon Controlled Rectifier (SCR) is connected with one input end of a bridge rectifier QL through a resistor R1, the other input end of the bridge rectifier QL is connected with an anode of the bidirectional Silicon Controlled Rectifier (SCR), an output end of the bridge rectifier QL is connected with a capacitor C2 in parallel, and an anode and a cathode of the bidirectional Silicon Controlled Rectifier (SCR) are connected in series in a starting winding loop of the single-phase motor.
The working principle is that when the starting winding loop is electrified, the voltage on the capacitor C2 is zero, the control electrode of the bidirectional thyristor SCR has current passing through and charges the capacitor C2, the bidirectional thyristor SCR is switched on, the voltage on the capacitor C2 continuously rises in the charging process, when the voltage on the capacitor C2 reaches a certain value, the control electrode of the bidirectional thyristor SCR has no current passing (or the current is very small), and the bidirectional thyristor SCR is switched off to withdraw the starting winding loop; the resistor R1 is a current-limiting resistor, the parameters of the resistor R1 and the capacitor C2 are reasonably selected, a proper charging time constant can be obtained, and the control electrode current of the bidirectional thyristor is limited; the charging time constant can ensure that the motor reaches a certain rotating speed before the capacitor C2 is charged.
Compared with the prior art, the starting switch of the single-phase motor has the advantages that 1, the silicon controlled rectifier is adopted as a non-contact switch, so that the problem of fatigue is avoided, and the service life can be prolonged; 2. after the charging time constant is determined, the starting winding can be ensured to be reliably disconnected after the motor is started, and the starting winding is prevented from being damaged due to long-time running; 3. the starting switch of the single-phase motor has two outgoing lines, the two outgoing lines are respectively led out from the anode and the cathode of the SCR, the outgoing lines are connected in series in the starting winding loop, wiring errors cannot occur (errors are easy to occur if the number of the outgoing lines is more than two), and the single-phase motor is convenient to install and replace.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
Specific embodiments of the present invention will now be described with reference to the accompanying drawings.
A starting switch of a single-phase motor comprises a bidirectional Silicon Controlled Rectifier (SCR), a resistor R1, a bridge rectifier (QL) and a capacitor C2.
The control electrode of the bidirectional Silicon Controlled Rectifier (SCR) is connected with one input end of the bridge rectifier (QL) through a resistor R1, the other input end of the bridge rectifier (QL) is connected with the anode of the bidirectional Silicon Controlled Rectifier (SCR), a capacitor C2 is connected between the anode and the cathode of the output end of the bridge rectifier (QL), and the anode and the cathode of the bidirectional Silicon Controlled Rectifier (SCR) are connected in series in the starting winding loop.
The single-phase motor comprises an operation winding L1 and a starting winding, wherein the starting winding consists of an auxiliary winding L2 and a capacitor C1 which are connected in series; one end of the operation winding L1 is connected with an A phase line of 220V commercial power, and the other end of the operation winding L1 is connected with a zero line; one end of the starting winding is connected with the phase line A, the other end of the starting winding is connected with the anode of the bidirectional silicon controlled rectifier SCR, and the cathode of the bidirectional silicon controlled rectifier SCR is connected with the zero line.
The starting switch of the single-phase motor can be packaged in a shell, the cathode of the bidirectional thyristor SCR is led out by a first lead J1, and the anode of the bidirectional thyristor SCR is led out by a second lead J2. Because only two leads are provided, the first lead and the second lead can be exchanged during wiring, and wiring errors do not need to be worried about, which is one of the advantages of the starting switch of the single-phase motor.
After the single-phase motor is electrified, because the voltage on the capacitor C2 can not change suddenly, the capacitor C2 is equivalent to a short circuit, the current passes through the control electrode of the bidirectional thyristor SCR, the bidirectional thyristor SCR is conducted, and the winding is started to work to enable the single-phase motor to rotate; the control pole current is converted into direct current through a bridge rectifier to charge the capacitor C2, the charging time is related to the parameters of the capacitor C2 and the resistor R1, and the parameters of the capacitor C2 and the resistor R1 are selected to obtain the proper charging time, so that the rotating speed of the single-phase motor can be increased to a rated value. When the charging time is up to the time that no current passes through the control electrode of the bidirectional silicon controlled rectifier SCR, the starting winding loop is disconnected. Since the turn-off of the start winding is time-controlled, overheating of the start winding due to long-term operation can be avoided.
Claims (2)
1. A starting switch of a single-phase motor comprises a bidirectional Silicon Controlled Rectifier (SCR), and is characterized in that a control electrode of the bidirectional Silicon Controlled Rectifier (SCR) is connected with one input end of a bridge rectifier QL through a resistor R1, the other input end of the bridge rectifier QL is connected with an anode of the bidirectional Silicon Controlled Rectifier (SCR), an output end of the bridge rectifier QL is connected with a capacitor C2 in parallel, and the anode and the cathode of the bidirectional Silicon Controlled Rectifier (SCR) are connected in a starting winding loop of the single-phase motor in series.
2. The starting switch of the single-phase motor as claimed in claim 1, wherein the elements of the starting switch of the single-phase motor are enclosed in a case, the cathode of the triac SCR is led out by a first lead J1, and the anode of the triac SCR is led out by a second lead J2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020947584.4U CN212305032U (en) | 2020-05-29 | 2020-05-29 | Starting switch of single-phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020947584.4U CN212305032U (en) | 2020-05-29 | 2020-05-29 | Starting switch of single-phase motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212305032U true CN212305032U (en) | 2021-01-05 |
Family
ID=73971068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020947584.4U Expired - Fee Related CN212305032U (en) | 2020-05-29 | 2020-05-29 | Starting switch of single-phase motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212305032U (en) |
-
2020
- 2020-05-29 CN CN202020947584.4U patent/CN212305032U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210105 |