CN213342065U - Motor rotating speed control circuit - Google Patents
Motor rotating speed control circuit Download PDFInfo
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- CN213342065U CN213342065U CN202022423133.3U CN202022423133U CN213342065U CN 213342065 U CN213342065 U CN 213342065U CN 202022423133 U CN202022423133 U CN 202022423133U CN 213342065 U CN213342065 U CN 213342065U
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Abstract
The utility model discloses a motor rotating speed control circuit, which comprises an alternating current power supply, a motor, a first resistor, a plurality of second resistors, a first capacitor and a bidirectional thyristor; the alternating current power supply, the motor and the bidirectional thyristor form a current loop; the resistance values of the plurality of second resistors are different; one end of the first resistor is electrically connected with a first pole of the bidirectional controllable silicon, the other end of the first resistor is electrically connected with one end of one of the second resistors, the other ends of the second resistors are electrically connected with a gate pole of the bidirectional controllable silicon and one end of the first capacitor respectively, and the other end of the first capacitor is electrically connected with a second pole of the bidirectional controllable silicon. The utility model discloses the cost is lower.
Description
Technical Field
The utility model relates to the technical field of motors, specifically a motor speed control circuit.
Background
The main effect of motor in the circuit is to produce driving torque, as the power supply of using electrical apparatus or various machinery, and among the prior art, to the rotational speed control of motor mostly adopt the electric capacity variable speed, however, this kind of control mode need change the electric capacity for the cost is higher.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a motor speed control circuit is provided, its cost is lower.
In order to solve the above technical problem, the present invention provides a motor rotation speed control circuit, which includes an ac power supply, a motor, a first resistor, a plurality of second resistors, a first capacitor and a bidirectional thyristor;
the alternating current power supply, the motor and the bidirectional thyristor form a current loop;
the resistance values of the plurality of second resistors are different;
one end of the first resistor is electrically connected with a first pole of the bidirectional controllable silicon, the other end of the first resistor is electrically connected with one end of one of the second resistors, the other ends of the second resistors are electrically connected with a gate pole of the bidirectional controllable silicon and one end of the first capacitor respectively, and the other end of the first capacitor is electrically connected with a second pole of the bidirectional controllable silicon.
Preferably, the motor speed control circuit further comprises a bidirectional diode, and the bidirectional diode is connected in series with a line between the gate of the bidirectional thyristor and the second resistor.
Preferably, the motor speed control circuit further includes a third resistor and a second capacitor, one end of the third resistor is electrically connected to the first pole of the triac, the other end of the third resistor is electrically connected to one end of the second capacitor, and the other end of the second capacitor is electrically connected to the second pole of the triac.
After the structure more than adopting, compared with the prior art, the utility model, have following advantage:
the utility model discloses a motor speed control circuit is at the during operation, through the charge-discharge time of controlling first electric capacity, controls bidirectional thyristor's conduction angle, from this rotational speed of controlling the motor for first electric capacity need not be changed, and the cost is reduced makes the utilization efficiency of first electric capacity higher moreover.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the motor speed control circuit of the present invention includes an ac power source 10, a motor 20, a first resistor 30, three second resistors 40, a first capacitor 50, and a bidirectional thyristor 60.
The ac power source 10, the motor 20, and the triac 60 form a current loop.
The resistance values of the three second resistors 40 are different, and the resistance values of the three second resistors 40 are 0-100K, 0-200K and 0-400K respectively.
One end of the first resistor 30 is electrically connected to the first pole a2 of the triac 60, the other end of the first resistor 30 is electrically connected to one end of one of the second resistors 40, the other ends of the three second resistors 40 are electrically connected to the gate G of the triac 60 and one end of the first capacitor 50, respectively, and the other end of the first capacitor 50 is electrically connected to the second pole a1 of the triac 60.
In this way, the first resistor 30 is connected to the different second resistor 40 to control the charging/discharging time of the first capacitor 50, thereby controlling the conduction angle of the triac 60 and controlling the rotation speed of the motor 20.
The motor speed control circuit further comprises a bidirectional diode 70, and the bidirectional diode 70 is connected in series with a line between the gate of the bidirectional thyristor 60 and the second resistor 40, so that the bidirectional diode 70 plays a role of overvoltage protection.
The motor speed control circuit further comprises a third resistor 80 and a second capacitor 90, one end of the third resistor 80 is electrically connected with the first pole A2 of the bidirectional thyristor 60, the other end of the third resistor 80 is electrically connected with one end of the second capacitor 90, and the other end of the second capacitor 90 is electrically connected with the second pole A1 of the bidirectional thyristor 60, so that the third resistor 80 and the second capacitor 90 play a role in overvoltage protection.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, but should not be construed as limiting the claims, and the present invention is not limited to the above-described embodiments, but may be modified in various ways. In summary, all changes that can be made within the scope of the independent claims of the present invention are within the scope of the present invention.
Claims (3)
1. A motor speed control circuit is characterized by comprising an alternating current power supply (10), a motor (20), a first resistor (30), a plurality of second resistors (40), a first capacitor (50) and a bidirectional thyristor (60);
the alternating current power supply (10), the motor (20) and the bidirectional thyristor (60) form a current loop;
the resistance values of the plurality of second resistors (40) are different;
one end of the first resistor (30) is electrically connected with a first pole of the bidirectional controllable silicon (60), the other end of the first resistor (30) is electrically connected with one end of one of the second resistors (40), the other ends of the second resistors (40) are respectively and electrically connected with a gate pole of the bidirectional controllable silicon (60) and one end of the first capacitor (50), and the other end of the first capacitor (50) is electrically connected with a second pole of the bidirectional controllable silicon (60).
2. The motor speed control circuit of claim 1, further comprising a bidirectional diode (70), wherein the bidirectional diode (70) is connected in series in a line between the gate of the triac (60) and the second resistor (40).
3. The motor speed control circuit of claim 2, further comprising a third resistor (80) and a second capacitor (90), wherein one end of the third resistor (80) is electrically connected to the first pole of the triac (60), the other end of the third resistor (80) is electrically connected to one end of the second capacitor (90), and the other end of the second capacitor (90) is electrically connected to the second pole of the triac (60).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022423133.3U CN213342065U (en) | 2020-10-27 | 2020-10-27 | Motor rotating speed control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022423133.3U CN213342065U (en) | 2020-10-27 | 2020-10-27 | Motor rotating speed control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213342065U true CN213342065U (en) | 2021-06-01 |
Family
ID=76074786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022423133.3U Active CN213342065U (en) | 2020-10-27 | 2020-10-27 | Motor rotating speed control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213342065U (en) |
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2020
- 2020-10-27 CN CN202022423133.3U patent/CN213342065U/en active Active
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