CN113054815A - Rotary transformer type exciter for low-speed brushless synchronous motor excitation - Google Patents
Rotary transformer type exciter for low-speed brushless synchronous motor excitation Download PDFInfo
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- CN113054815A CN113054815A CN202110263946.7A CN202110263946A CN113054815A CN 113054815 A CN113054815 A CN 113054815A CN 202110263946 A CN202110263946 A CN 202110263946A CN 113054815 A CN113054815 A CN 113054815A
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- synchronous motor
- exciter
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- stator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/16—Synchronous generators
- H02K19/38—Structural association of synchronous generators with exciting machines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/42—Asynchronous induction generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/02—Synchronous motors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Synchronous Machinery (AREA)
Abstract
The invention discloses a rotary transformer type exciter for excitation of a low-rotation-speed brushless synchronous motor, which solves the problem that the low-rotation-speed synchronous motor can be used as a generator and a motor to operate under the excitation of a coaxial exciter. An exciter rotor core (3) and an exciter rotor three-phase alternating current symmetrical winding (4) are arranged on a synchronous motor rotor rotating shaft (5), an exciter stator (1) is arranged on a synchronous motor base (7), an exciter stator three-phase alternating current symmetrical winding (2) is arranged on the exciter stator (1), a rotating rectifier (6) is arranged on the synchronous motor rotor rotating shaft (5) between the exciter rotor core and a synchronous motor rotor, outgoing lines of the exciter rotor three-phase alternating current symmetrical winding (4) are electrically connected with the input end of the rotating rectifier, and a synchronous motor rotor one-way coil (9) is electrically connected with the output end of the rotating rectifier through a connecting line (10). The mechanism is simple and easy to realize, small in size and light in weight.
Description
Technical Field
The present invention relates to an exciter, and more particularly to a resolver type exciter for exciting a brushless synchronous motor.
Background
The electrically excited brushless synchronous motor consists of mainly one main motor and one exciter, and the main motor and the exciter are installed coaxially and rotate synchronously during running to excite the main motor. At present, an exciter for an electrically excited brushless synchronous motor generally adopts a rotating armature type synchronous generator, wherein a stator is a magnetic pole system, a rotor is an armature system, direct current is introduced into a stator winding of the exciter to enable the stator winding to generate a magnetic field, the rotor of the exciter is driven to rotate, the rotor winding of the exciter can emit alternating current, the emitted alternating current is rectified into direct current through a rotating rectifier, and the rectified direct current is input into a rotor winding of a main motor to become an excitation power supply of the main motor. This form of exciter has two drawbacks, (1) the exciter is only able to generate excitation power when dragged in rotation, and is therefore only suitable for exciting a coaxial generator-running main machine, and not a coaxial motor-running main machine. When the main motor runs in the motor state, enough excitation is needed during starting, and the exciter can not output excitation electric energy at the moment, so that the main motor is difficult to start. (2) The exciter excited main motor is only suitable for medium and high speed motors, but not suitable for low speed motors, because the same excitation power, if the main motor runs at low speed, the rotating speed of the exciter is low due to coaxiality, the volume and the weight of the exciter are required to be large, and the exciter does not have practicability.
Disclosure of Invention
The invention provides a rotary transformer type exciter for exciting a low-rotation-speed brushless synchronous motor, which solves the technical problem that the low-rotation-speed synchronous motor is suitable for running of a generator and a motor under the excitation of a coaxial exciter, and realizes the miniaturization of the volume and the weight of the low-rotation-speed exciter.
The invention solves the technical problems by the following technical scheme:
the general concept of the invention is: the exciter is designed as a winding type double-fed asynchronous generator, three-phase alternating current symmetrical windings are arranged on a stator and a rotor of the exciter, a rotary rectifier is arranged on a coaxial rotating shaft, the lead ends of the three-phase alternating current symmetrical windings on the rotor of the exciter are electrically connected with the input end of the rotary rectifier, and exciting current is provided for the rotor of the low-rotation-speed brushless synchronous motor through the output end of the rotary rectifier.
A rotary transformer type exciter for low-speed brushless synchronous motor excitation is composed of synchronous motor stator with stator coils, synchronous motor rotor with single-phase winding and rotary axle, synchronous motor base with rotor core, stator coils, rotor shaft, rotor core with symmetrical three-phase AC windings, rotary rectifier, and three-phase AC windings connected between rotor core and synchronous motor rotor, the one-way coil of the synchronous motor rotor is electrically connected with the output end of the rotating rectifier through a connecting wire.
The frequency of three-phase alternating current connected to the three-phase alternating current symmetrical winding of the exciter stator is 400-; the stator coil of the synchronous motor is a three-phase coil or a single-phase coil. The rotary transformer type exciter has the working principle similar to that of a transformer, is structurally similar to a wound-rotor double-fed asynchronous generator, and consists of a static stator and a rotating rotor, so the rotary transformer type exciter is called, wherein a stator coil of the exciter is connected with an adjustable medium-frequency three-phase power supply, and the rotor is connected with an excitation coil of a rotor of a main machine through the rotary transformer to provide excitation electric energy for the main machine; because the exciter adopts the transformer working principle, even under the condition that a rotating shaft of a synchronous motor rotor is still, as long as three-phase alternating current connected with a three-phase alternating current symmetrical winding of an exciter stator is switched on, a rotating magnetic field can be generated in the exciter, so that alternating current is generated in the three-phase alternating current symmetrical winding of the exciter rotor, the alternating current outputs electric energy to a one-way coil of the synchronous motor rotor through a rotating rectifier, the excitation of the synchronous motor rotor is finished, and if power is supplied to the stator coil of the synchronous motor at the moment, the synchronous motor can be operated as a motor. Since the volume and weight of the rotary transformer are mainly determined by the frequency when the power is constant, the volume and weight of the rotary transformer are approximately in inverse proportion to the frequency, and the relation with the rotating speed of the main machine is not large, the frequency of the exciter adopts the intermediate frequency, so that the small volume and the light weight of the exciter can be realized even if the exciter is used for a brushless synchronous motor with lower working rotating speed.
One end of the rotor rotating shaft of the synchronous motor is connected with a propeller, and the other end of the rotor rotating shaft of the synchronous motor is connected with a diesel generator.
The invention is especially suitable for the low-rotating-speed brushless synchronous generator with the requirement of motor operation, and has the advantages of simple and easy mechanism realization, small volume and light weight.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a rotary transformer type exciter for low-speed brushless synchronous motor excitation comprises a synchronous motor stator, a synchronous motor rotor, a synchronous motor base 7 and a synchronous motor end cover 8, wherein a synchronous motor stator coil 11 is arranged on the synchronous motor stator, a synchronous motor rotor single-phase coil 9 and a synchronous motor rotor rotating shaft 5 are respectively arranged on the synchronous motor rotor, an exciter rotor core 3 is arranged on the synchronous motor rotor rotating shaft 5, an exciter rotor three-phase alternating current symmetrical winding 4 is arranged on the exciter rotor core 3, an exciter stator core 1 is arranged on the synchronous motor base 7 or on the synchronous motor end cover 8, an exciter stator three-phase alternating current symmetrical winding 2 is arranged on the exciter stator core 1, a rotary rectifier 6 is arranged on the synchronous motor rotor rotating shaft 5 between the exciter rotor core 3 and the synchronous motor rotor, the outgoing line of the three-phase alternating current symmetrical winding 4 of the exciter rotor is electrically connected with the input end of the rotating rectifier 6, and the synchronous motor rotor unidirectional coil 9 is electrically connected with the output end of the rotating rectifier 6 through a connecting wire 10.
The frequency of three-phase alternating current connected to the exciter stator three-phase alternating current symmetrical winding 2 is 400-; the stator coil 11 of the synchronous motor is a three-phase coil or a single-phase coil; the rotary transformer type exciter uses a wound double-fed asynchronous generator as a rotary transformer, an exciter stator winding 2 is equivalent to a primary side of the rotary transformer and is powered by a medium-frequency power supply, after a three-phase medium-frequency power supply is connected, a rotary magnetic field is generated in the exciter, the rotary magnetic field induces and generates three-phase medium-frequency alternating current in an exciter rotor winding 4, and the exciter rotor winding 4 is equivalent to a secondary side of the rotary transformer; the three-phase alternating current provided by the intermediate frequency power supply can be automatically adjusted according to the operation parameters of the synchronous main motor; the direction of rotation of the rotating magnetic field generated in the exciter can be positive or negative relative to the direction of rotation of the exciter rotor, and the direction of rotation of the rotating magnetic field can be changed by changing the connection phase sequence of the exciter stator winding 2 and the intermediate frequency power supply; when the rotating magnetic field is opposite to the direction of the exciter rotor, the rotating magnetic field has a certain effect of reducing the volume and weight of the exciter; when the exciter rotor is static, the exciter is in a pure transformer working mode, and the exciting electric energy provided by the exciter to the one-way coil 9 of the synchronous motor rotor completely depends on the intermediate frequency power supply; when the rotor shaft 5 of the synchronous motor is driven by other dragging equipment to rotate, namely the rotor of the exciter rotates, the exciter supplies excitation electric energy to the unidirectional coil 9 of the rotor of the synchronous motor, most of the excitation electric energy is obtained from a medium-frequency power supply, and other parts are obtained by mechanical energy conversion, namely the three-phase medium-frequency power supply of the exciter supplies power to the three-phase alternating current symmetrical winding 2 of the stator of the exciter at the moment to generate a rotating magnetic field, at the moment, the rotor of the exciter also rotates under the dragging of other dragging equipment, the rotating speed of the rotating magnetic field is opposite to the rotating speed of the rotor of the rotating exciter to obtain a relative rotating speed, the relative rotating speed is the speed of cutting magnetic lines of force of the rotor winding 4 of the exciter, the rotor winding 4 of the exciter generates electricity at the speed of cutting the magnetic lines of force, and the excitation.
The invention is particularly suitable for diesel engine systems on ships, the tail of the output shaft of the diesel engine is connected with a propeller, and the synchronous motor and the exciter of the invention can be integrated on the output shaft of the diesel engine; when the ship normally runs, the diesel engine drives the ship to run through the propeller on the output shaft, at the moment, a three-phase medium-frequency power supply can be connected to the exciter stator three-phase alternating current symmetrical winding 2, the synchronous motor runs as a generator at the moment, alternating current can be sent out from a stator coil 11 of the synchronous motor to supply power to other equipment on the ship, the mechanical rotating speed of the output shaft of the diesel engine is 50-200 revolutions per minute, and the frequency of the three-phase medium-frequency power supply is 400 plus 20000 Hz; when the diesel engine breaks down and stops rotating, the three-phase medium-frequency power supply on the ship supplies power to the exciter stator three-phase alternating current symmetrical winding 2, and other power supplies on the ship supply power to the synchronous motor stator coil 11, the synchronous motor operates as a motor at the moment, the propeller on the output shaft is driven, and the ship continues to sail back to the port.
Claims (3)
1. A rotary transformer type exciter for low-speed brushless synchronous motor excitation comprises a synchronous motor stator, a synchronous motor rotor, a synchronous motor base (7) and a synchronous motor end cover (8), wherein a synchronous motor stator coil (11) is arranged on the synchronous motor stator, a synchronous motor rotor single-phase coil (9) and a synchronous motor rotor rotating shaft (5) are respectively arranged on the synchronous motor rotor, and the rotary transformer type exciter is characterized in that an exciter rotor core (3) is arranged on the synchronous motor rotor rotating shaft (5), an exciter rotor three-phase alternating current symmetrical winding (4) is arranged on the exciter rotor core (3), an exciter stator core (1) is arranged on the synchronous motor base (7) or on the synchronous motor end cover (8), an exciter stator three-phase alternating current symmetrical winding (2) is arranged on the exciter stator core (1), a rotating rectifier (6) is arranged on a synchronous motor rotor rotating shaft (5) between an exciter rotor iron core (3) and a synchronous motor rotor, an outgoing line of a three-phase alternating current symmetrical winding (4) of the exciter rotor is electrically connected with the input end of the rotating rectifier (6), and a synchronous motor rotor one-way coil (9) is electrically connected with the output end of the rotating rectifier (6) through a connecting line (10).
2. The rotary transformer type exciter for excitation of low-speed brushless synchronous motors as claimed in claim 1, wherein the frequency of the three-phase alternating current connected to the three-phase alternating current symmetrical winding (2) of the exciter stator is 400-; the stator coil (11) of the synchronous motor is a three-phase coil or a single-phase coil.
3. A resolver exciter according to claim 2, where a propeller is connected to one end of the rotor shaft (5) of the synchronous motor, and a diesel engine is connected to the other end of the rotor shaft (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110263946.7A CN113054815A (en) | 2021-03-11 | 2021-03-11 | Rotary transformer type exciter for low-speed brushless synchronous motor excitation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110263946.7A CN113054815A (en) | 2021-03-11 | 2021-03-11 | Rotary transformer type exciter for low-speed brushless synchronous motor excitation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113054815A true CN113054815A (en) | 2021-06-29 |
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ID=76511486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110263946.7A Pending CN113054815A (en) | 2021-03-11 | 2021-03-11 | Rotary transformer type exciter for low-speed brushless synchronous motor excitation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113054815A (en) |
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2021
- 2021-03-11 CN CN202110263946.7A patent/CN113054815A/en active Pending
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