CN113890420A - Contactless starter for refrigeration compressor with large working current - Google Patents
Contactless starter for refrigeration compressor with large working current Download PDFInfo
- Publication number
- CN113890420A CN113890420A CN202111193690.3A CN202111193690A CN113890420A CN 113890420 A CN113890420 A CN 113890420A CN 202111193690 A CN202111193690 A CN 202111193690A CN 113890420 A CN113890420 A CN 113890420A
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- Prior art keywords
- temperature coefficient
- positive temperature
- ptc1
- motor
- bidirectional thyristor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/42—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/42—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor
- H02P1/44—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor by phase-splitting with a capacitor
- H02P1/445—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor by phase-splitting with a capacitor by using additional capacitors switched at start up
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor And Converter Starters (AREA)
Abstract
A contactless starter suitable for a refrigeration compressor with larger working current belongs to the technical field of motor starting devices. The motor positive temperature coefficient thermistor comprises a first positive temperature coefficient thermistor PTC1, a second positive temperature coefficient thermistor PTC2 and a bidirectional thyristor T, wherein a first pole T1 of the bidirectional thyristor T is connected with a leading-out end S of a secondary winding of a motor, a plurality of first positive temperature coefficient thermistors PTC1 are arranged, one ends of the plurality of first positive temperature coefficient thermistors PTC1 which are connected in parallel are connected with one end of a second positive temperature coefficient thermistor PTC2 to be connected to a power supply end N together, the other ends of the first positive temperature coefficient thermistors PTC1 are connected with a second pole T2 of the bidirectional thyristor T, and the other end of the second positive temperature coefficient thermistor PTC2 is connected with a trigger electrode G of the bidirectional thyristor T. The advantages are that: by utilizing the principle of PTC current automatic balance, the current in each first positive temperature coefficient thermistor PTC1 tends to increase in balance, and the large current support of the contactless starter is realized.
Description
Technical Field
The invention belongs to the technical field of motor starting devices, and particularly relates to a non-contact starter suitable for a refrigeration compressor with larger working current, which is suitable for starting a single-phase motor refrigeration compressor with larger working current.
Background
In a refrigeration compressor using a single-phase motor, the single-phase motor is supplied with a single-phase alternating current, and in particular, a capacitor or resistor phase splitting method is often used, and the single-phase motor is composed of a rotor and a stator with a main winding and an auxiliary winding. When the motor is started, the starting circuit of the secondary winding needs to be conducted, the starting torque of the motor is improved by the phase difference between the secondary winding and the main winding, and further the starting performance of the motor is improved. After the motor is started, the auxiliary winding starting circuit can be disconnected, because the auxiliary winding only needs a small auxiliary torque to ensure the stable and efficient work of the motor under the driving of the rotation inertia of the rotor, and the disconnection of the auxiliary winding starting circuit is helpful for improving the normal work efficiency of the motor, therefore, a starter is needed to realize the function of keeping the auxiliary winding starting circuit on for a period of time during starting of the refrigeration compressor using the single-phase motor.
Conventionally, the starter of the refrigeration compressor using the single-phase motor is realized in a relay form, wherein a current type starting relay and a voltage type starting relay are divided, and the starting circuit of the secondary winding is switched on at the beginning of the starting of the motor and the starting circuit of the secondary winding is switched off when the starting of the motor is basically completed by respectively utilizing the change rule of current and voltage of a motor working circuit in the starting process of the motor. The starting relay is mainly characterized in that the movable contact of the relay is pushed by electromagnetic force to realize on-off control of a circuit. It is known that the contact operation of a relay has several major problems: long mechanical action time (compared with the on-off of an electrical switch); noise is generated during the action; the lifetime limit of the contact and the sparking of the contact. Although the mechanical action time of the relay has no great influence on the refrigeration compressor, the influence on the refrigeration compressor is obvious by other problems, for example, action noise greatly influences the customer experience of products, and the service life and electric spark of contacts limit the service life and application occasions of the refrigeration compressor. Therefore, the refrigerant compressor starter is required to be free of contact, and is an important development direction in the industry, such as a PTC (positive temperature coefficient thermistor) starter, a low power consumption starter, a non-power consumption starter, and the like. However, all of these contactless starters have a common problem that they cannot support a refrigeration compressor with a large current, and the reason is the same because these starters use a PTC, and the PTC that is currently available on the market for motor starting allows a maximum operating current of about 10A, and cannot support a larger current. For this reason, the single-phase refrigeration compressors on the market currently having a large operating current can only use a starting relay with contacts, and no suitable contactless starter can be used. The present invention proposes a solution to this problem, making it possible to adapt contactless starters for refrigeration compressors with a high operating current, the solution to be described being created in this context.
Disclosure of Invention
The invention aims to provide a contactless starter which has simple circuit, less elements and reliable electrical performance and is suitable for a refrigeration compressor with larger working current.
The invention aims to achieve the aim that the contactless starter suitable for the refrigeration compressor with larger working current comprises a first positive temperature coefficient thermistor PTC1, a second positive temperature coefficient thermistor PTC2 and a bidirectional thyristor T, wherein a first pole T1 of the bidirectional thyristor T is connected with a leading-out terminal S of a secondary winding of a motor, and the contactless starter is characterized in that: the number of the first positive temperature coefficient thermistors PTC1 is multiple, one end of the first positive temperature coefficient thermistors PTC1 which are connected in parallel and one end of the second positive temperature coefficient thermistors PTC2 are connected to a power supply end N together, the other end of the first positive temperature coefficient thermistors PTC1 which are connected in parallel is connected to the second pole T2 of the bidirectional thyristor T, and the other end of the second positive temperature coefficient thermistors PTC2 is connected to the trigger electrode G of the bidirectional thyristor T.
In a specific embodiment of the present invention, the starting capacitor Cs is further included, one end of the plurality of first PTC thermistors PTC1 connected in parallel with each other and one end of the second PTC thermistors PTC2 are commonly connected to one end of the starting capacitor Cs, and the other end of the starting capacitor Cs is connected to the power supply terminal N.
In another specific embodiment of the present invention, the starting capacitor Cs is further included, and one end of the starting capacitor Cs is connected to the first electrode T1 of the triac T, and the other end of the starting capacitor Cs is connected to the secondary winding terminal of the motor.
Due to the adoption of the structure, compared with the prior art, the invention has the beneficial effects that: by utilizing the principle of PTC current automatic balance, when a plurality of first PTC thermistors PTC1 connected in parallel work simultaneously, the current in each first PTC thermistors PTC1 tends to increase in balance and finally reaches the Curie point basically and synchronously, thereby realizing the large current support of the non-contact starter.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is a schematic view of another embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be described with reference to the accompanying drawings, but the description of the embodiments is not intended to limit the technical solutions, and any changes in form and not essential to the inventive concept should be regarded as the protection scope of the present invention.
In the following description, any concept related to the directionality (or the directional nature) of up, down, left, right, front, and rear is intended to facilitate understanding by the public, and thus should not be construed as particularly limiting the technical solution provided by the present invention, with respect to the position state in which the drawings are being described.
Example 1:
referring to fig. 1, the present invention relates to a contactless starter for a refrigerating compressor having a large operating current, for starting a refrigerating compressor having a single-phase ac motor having a large operating current. The single-phase alternating current motor is provided with a stator consisting of at least one main winding and one auxiliary winding, and a permanent operation capacitor Cr is connected between leading-out ends of the main winding and the auxiliary winding. The leading-out end of the main winding of the motor is M, the leading-out end of the auxiliary winding of the motor is S, and the merging leading-out end of the main winding and the auxiliary winding of the motor is L, wherein the leading-out end of the main winding of the motor is one power supply end N of the M connected with an external single-phase alternating-current power supply, and the merging leading-out end of the main winding and the auxiliary winding of the motor is the other power supply end of the L forming the external single-phase alternating-current power supply. The contactless starter comprises a first positive temperature coefficient thermistor PTC1, a second positive temperature coefficient thermistor PTC2 and a bidirectional thyristor T, wherein a first pole T1 of the bidirectional thyristor T is connected with a leading-out end of a secondary winding of a motor and is S. The first positive temperature coefficient thermistor PTC1 has a plurality of first positive temperature coefficient thermistors PTC1, one end of each first positive temperature coefficient thermistor PTC1 and one end of each second positive temperature coefficient thermistor PTC2 are connected to a power supply end N together, the other end of each first positive temperature coefficient thermistor PTC1 is connected to the second pole T2 of the bidirectional thyristor T in parallel, and the other end of each second positive temperature coefficient thermistor PTC2 is connected to the trigger electrode G of the bidirectional thyristor T.
Furthermore, the invention also comprises a starting capacitor Cs, wherein one end of the plurality of first positive temperature coefficient thermistors PTC1 which are connected in parallel and one end of the second positive temperature coefficient thermistor PTC2 are connected with one end of the starting capacitor Cs together, and the other end of the starting capacitor Cs is connected with a power supply end N.
In this embodiment, the two first PTC thermistors PTC1 are illustrated, and the operation principle of the present embodiment is that a plurality of PTCs are connected in parallel, and the principle of automatic current balance of the PTCs is utilized to realize the large current support of the parallel first PTC thermistor PTC 1. Specifically, when current passes through a plurality of first PTC thermistor PTC1 of the same specification or similar parameters connected in parallel, the first PTC thermistor PTC1 with a smaller resistance value will have a larger current passing through it, which causes the first PTC thermistor PTC1 to generate more heat, and due to the PTC variation characteristics of the PTC, the resistance value of the first PTC thermistor PTC1 will become larger, which tends to prevent the current in the first PTC thermistor PTC1 from increasing. Similarly, the current in the first PTC thermistor PTC1 having a larger resistance value is correspondingly smaller, which hinders the tendency in which the current increases also smaller, and thus the current tends to become larger. Thus, when a plurality of parallel first PTC thermistors PTC1 are operated simultaneously, the current in each first PTC thermistor PTC1 will tend to increase in equilibrium and eventually reach the curie point substantially simultaneously.
Example 2:
referring to fig. 2, in this embodiment, one end of the starting capacitor Cs is connected to the first electrode T1 of the triac T, and the other end is connected to the secondary winding terminal of the motor to be S, which is the same as that in embodiment 1.
Claims (3)
1. A contactless starter suitable for the refrigeration compressor with larger working current comprises a first positive temperature coefficient thermistor PTC1, a second positive temperature coefficient thermistor PTC2 and a bidirectional thyristor T, wherein a first pole T1 of the bidirectional thyristor T is connected with a leading-out terminal S of a secondary winding of a motor, and the contactless starter is characterized in that: the number of the first positive temperature coefficient thermistors PTC1 is multiple, one end of the first positive temperature coefficient thermistors PTC1 which are connected in parallel and one end of the second positive temperature coefficient thermistors PTC2 are connected to a power supply end N together, the other end of the first positive temperature coefficient thermistors PTC1 which are connected in parallel is connected to the second pole T2 of the bidirectional thyristor T, and the other end of the second positive temperature coefficient thermistors PTC2 is connected to the trigger electrode G of the bidirectional thyristor T.
2. The contactless starter for a refrigerant compressor having a large operating current as claimed in claim 1, further comprising a starting capacitor Cs, one end of the plurality of first PTC thermistors PTC1 connected in parallel with each other and one end of the second PTC thermistors PTC2 being connected in common to one end of said starting capacitor Cs, the other end of the starting capacitor Cs being connected to a power source terminal N.
3. The contactless starter for a refrigerating compressor with a large operating current according to claim 1, further comprising a starting capacitor Cs having one end connected to the first pole T1 of the triac T and the other end connected to the secondary winding terminal of the motor by S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111193690.3A CN113890420A (en) | 2021-10-13 | 2021-10-13 | Contactless starter for refrigeration compressor with large working current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111193690.3A CN113890420A (en) | 2021-10-13 | 2021-10-13 | Contactless starter for refrigeration compressor with large working current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113890420A true CN113890420A (en) | 2022-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111193690.3A Pending CN113890420A (en) | 2021-10-13 | 2021-10-13 | Contactless starter for refrigeration compressor with large working current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113890420A (en) |
-
2021
- 2021-10-13 CN CN202111193690.3A patent/CN113890420A/en active Pending
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