A winding switching module for a variable-excitation salient-pole motor based on a bridge-type power converter

Abstract

The present application discloses a winding switching module for a variable-excitation salient-pole motor based on a bridge-type power converter. When the variable-excitation salient-pole motor is in a preset mode, the motor controller MCU provides a winding switching signal to the variable-excitation salient-pole motor module to control the variable-excitation salient-pole motor to realize the switching between two modes: switched reluctance motor starting / electro-excited doubly salient motor generating electricity; the winding switching module is composed of 4 single-pole double-throw relays and a single-pole single-throw relay S5, and is characterized in that the armature winding W1 and the field winding W2 are connected. By means of manual or automatic control, the connection mode of the outgoing line end of the winding switching module is controlled to realize that the variable-excitation salient-pole motor operates in the switched reluctance motor mode during electric operation and in the electro-excited doubly salient motor mode during power generation.

Description

Technical Field

[0001] This application relates to the technical field of electric motors, and more specifically, to a winding switching module for a variable-excitation salient-pole motor based on a bridge-type power converter. Background Art

[0002] An electric generator can operate both as an electric motor and as a generator. Motors such as automotive starting motors and drive motors should have both of these functions to supply power to electrical equipment after starting, or to recover braking energy after driving the vehicle. In order to achieve efficient operation at low starting speeds and stable output voltage at high speeds, this patent studies a motor that realizes variable-excitation operation through winding switching.

[0003] Currently, there are not many winding switching methods or modules specifically for salient-pole motors, and their related patents mainly focus on permanent magnet synchronous motors and asynchronous motors. For example, the utility patent with the application number 200920353470.0 discloses a contactless dual-power DC motor stator winding connection structure, which uses a DC dual-power motor with a total of 3-phase windings, and the controller performs star / delta conversion connection of the motor windings through a contactless relay. The invention patent with the application number 201710777797.X discloses a star / delta conversion connection form applied to the field of permanent magnet synchronous motors.

[0004] Currently, after domestic and foreign searches by the applicant, no patents for winding switching methods and modules for variable-excitation salient-pole motors have been retrieved. Summary of the Invention

[0005] To solve the above technical problems, this application provides a winding switching module for a variable-excitation salient-pole motor based on a bridge-type power converter to realize the switching between two modes of a switched reluctance motor starting / an electro-excited double salient-pole motor generating electricity for the variable-excitation salient-pole motor.

[0006] To achieve the above technical purpose, the embodiments of this application provide the following technical solution: A winding switching module for a variable-excitation salient-pole motor based on a bridge-type power converter is composed of a first single-pole double-throw relay S1, a second single-pole double-throw relay S2, a third single-pole double-throw relay S3, a fourth single-pole double-throw relay S4, and a single-pole single-throw relay S5.

[0007] The variable-excitation salient-pole motor system has an armature winding W1 composed of three-phase windings A, B, and C, an excitation winding W2 composed of three-phase windings A', B', and C', a power inverter composed of a bridge circuit, and a current regulating circuit Ur composed of an asymmetric half-bridge circuit.

[0008] The common terminal of the first single-pole double-throw relay S1 is connected to the tail end of the A-phase winding of the armature winding W1. The normally closed contact H1 of the first single-pole double-throw relay S1 is connected to the normally closed contact H3 of the third single-pole double-throw relay S3. The normally open contact O1 of the first single-pole double-throw relay S1 is connected to the tail end of the B-phase winding of the armature winding W1.

[0009] The common terminal of the second single-pole double-throw relay S2 is connected to the tail end of the C-phase winding of the armature winding W1. The normally closed contact H2 of the second single-pole double-throw relay S2 is connected to the normally closed contact H4 of the fourth single-pole double-throw relay S4. The normally open contact O2 of the second single-pole double-throw relay S2 is connected to the tail end of the B-phase winding of the armature winding W1.

[0010] The common terminal of the third single-pole double-throw relay S3 is connected to the head end of the A'-phase winding of the field winding W2. The normally closed contact H3 of the third single-pole double-throw relay S3 is connected to the normally closed contact H1 of the first single-pole double-throw relay S1. The normally open contact O of the third single-pole double-throw relay S3 is connected to the head end of the B'-phase winding of the field winding W2.

[0011] The common terminal of the fourth single-pole double-throw relay S4 is connected to the head end of the B'-phase winding of the field winding W2. The normally closed contact H4 of the fourth single-pole double-throw relay S4 is connected to the tail of the B-phase winding of the armature winding W1. The normally open contact O4 of the fourth single-pole double-throw relay S4 is connected to the head end of the C'-phase winding of the field winding W2.

[0012] The single-pole single-throw relay S5 connects the bridge-type power inverter and the current regulating circuit Ur composed of an asymmetrical half-bridge circuit.

[0013] A variable-excitation salient-pole motor winding switching module as described above is characterized by controlling the winding switching process of the variable-excitation salient-pole motor. The variable-excitation salient-pole motor winding switching process includes.

[0014] The variable-excitation salient-pole motor is in a preset mode, and the motor controller provides a winding switching signal to the variable-excitation salient-pole motor module.

[0015] When the variable-excitation salient-pole motor is converted from the generating mode to the starting mode, the control terminal of the variable-excitation salient-pole motor winding switching module is powered off. The common terminals and the normally open contacts of the four single-pole double-throw relays are disconnected and connected to the normally closed contacts. The tail end of the A-phase winding of the armature winding W1 is connected to the head end of the A'-phase winding of the field winding W2 to jointly form an A''-phase winding. The tail end of the B-phase winding of the armature winding W1 is connected to the head end of the B'-phase winding of the field winding W2 to jointly form a B''-phase winding. The tail end of the C-phase winding of the armature winding W1 is connected to the head end of the C'-phase winding of the field winding W2 to jointly form a C''-phase winding.

[0016] The windings of A'', B'' and C'' are connected in star and connected to a bridge-type power inverter.

[0017] The single-pole single-throw relay S5 is disconnected, and the current regulation circuit Ur composed of an asymmetrical half-bridge circuit is disconnected from the power supply.

[0018] When the variable-excitation salient-pole motor is converted from the starting mode to the generating mode, the control terminal of the variable-excitation salient-pole motor winding switching module is energized. The common terminals of the four single-pole double-throw relays are disconnected from the normally-closed contacts and connected to the normally-open contacts. A star connection is formed between the windings of phases A, B, and C of the armature winding W1, and the windings of phases A', B', and C' of the field winding W2 are connected in parallel. The field winding W2 is connected to the current regulation circuit Ur to generate an excitation magnetic field.

[0019] The single-pole single-throw relay S5 is closed, and the current regulation circuit Ur composed of an asymmetrical half-bridge circuit is connected to the power supply.

[0020] As can be seen from the above technical solutions, the present application discloses a variable-excitation salient-pole motor winding switching module based on a bridge-type power converter. When the variable-excitation salient-pole motor is in a preset mode, the motor controller MCU sends a winding switching signal to the variable-excitation salient-pole motor winding switching module to control the variable-excitation salient-pole motor to realize the switching between two modes: switched reluctance motor starting / electro-excited double salient-pole motor generating; the winding switching module is composed of 4 single-pole double-throw relays and a single-pole single-throw relay S5, and is characterized in that the armature winding W1 and the field winding W2 are connected. By manual or automatic means, the connection mode of the outgoing line end of the winding switching module is controlled to enable the variable-excitation salient-pole motor to operate in the switched reluctance motor mode during electric operation and in the electro-excited double salient-pole motor mode during generating. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following briefly introduces the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0022] Figure 1 A variable-excitation salient-pole motor winding switching module based on a bridge-type power converter provided for an embodiment of the present application.

[0023] Figure 2 The coil connection form in the starting mode provided for an embodiment of the present application.

[0024] Figure 3The coil connection form in the power generation mode provided by an embodiment of the present application.

[0025] Figure 4 Schematic diagram of the variable-excitation salient-pole motor structure adopted in an embodiment of the present application. Detailed implementation manners

[0026] Next, in combination with the accompanying drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0027] Figure 1 Shows a winding switching module of a variable-excitation salient-pole motor based on a bridge-type power converter proposed herein, which is composed of a first single-pole double-throw relay S1, a second single-pole double-throw relay S2, a third single-pole double-throw relay S3, a fourth single-pole double-throw relay S4, and a single-pole single-throw relay S5.

[0028] The variable-excitation salient-pole motor system has an armature winding W1 composed of three-phase windings A, B, and C, an excitation winding W2 composed of three-phase windings A', B', and C', a power inverter composed of a bridge circuit, and a current regulation circuit Ur composed of an asymmetrical half-bridge circuit.

[0029] Among them, the common terminal of the first single-pole double-throw relay S1 is connected to the tail end of the A-phase winding of the armature winding W1. The normally closed contact H1 of the first single-pole double-throw relay S1 is connected to the normally closed contact H3 of the third single-pole double-throw relay S3. The normally open contact O1 of the first single-pole double-throw relay S1 is connected to the tail end of the B-phase winding of the armature winding W1.

[0030] The common terminal of the second single-pole double-throw relay S2 is connected to the tail end of the C-phase winding of the armature winding W1. The normally closed contact H2 of the second single-pole double-throw relay S2 is connected to the normally closed contact H4 of the fourth single-pole double-throw relay S4. The normally open contact O2 of the second single-pole double-throw relay S2 is connected to the tail end of the B-phase winding of the armature winding W1.

[0031] The common terminal of the third single-pole double-throw relay S3 is connected to the head end of the A'-phase winding of the excitation winding W2. The normally closed contact H3 of the third single-pole double-throw relay S3 is connected to the normally closed contact H1 of the first single-pole double-throw relay S1. The normally open contact O of the third single-pole double-throw relay S3 is connected to the head end of the B'-phase winding of the excitation winding W2.

[0032] The common terminal of the fourth single-pole double-throw relay S4 is connected to the starting end of the B'-phase winding of the exciting winding W2. The normally-closed contact H4 of the fourth single-pole double-throw relay S4 is connected to the ending end of the B-phase winding of the armature winding W1. The normally-open contact O4 of the fourth single-pole double-throw relay S4 is connected to the starting end of the C'-phase winding of the exciting winding W2.

[0033] The single-pole single-throw relay S5 connects the bridge-type power inverter and the current regulating circuit Ur composed of an asymmetrical half-bridge circuit.

[0034] Combined with Figure 1 、 Figure 2 and Figure 3 explain the working principle of the winding switching module proposed in this paper.

[0035] The number of turns of the windings of phases A, B, and C in the armature winding W1 is all N, and the number of turns of the windings of phases A', B', and C' in the exciting winding W2 is all N'.

[0036] When the variable-excitation salient-pole motor is in a preset mode, the motor controller MCU sends a winding switching signal to the winding switching module of the variable-excitation salient-pole motor.

[0037] When the variable-excitation salient-pole motor is converted from the generating mode to the starting mode, the control terminal of the winding switching module of the variable-excitation salient-pole motor is powered off. The common terminals of the four single-pole double-throw relays are disconnected from the normally-open contacts and connected to the normally-closed contacts. The ending end of the A-phase winding of the armature winding W1 is connected to the starting end of the A'-phase winding of the exciting winding W2, jointly forming an A''-phase winding with a number of turns of N+N'. The ending end of the B-phase winding of the armature winding W1 is connected to the starting end of the B'-phase winding of the exciting winding W2, jointly forming a B''-phase winding with a number of turns of N+N'. The ending end of the C-phase winding of the armature winding W1 is connected to the starting end of the C'-phase winding of the exciting winding W2, jointly forming a C''-phase winding with a number of turns of N+N'.

[0038] The single-pole single-throw relay S5 is disconnected, and the current regulating circuit Ur composed of an asymmetrical half-bridge circuit is disconnected from the power supply.

[0039] After the process of converting from the generating mode to the starting mode ends, as Figure 2 shown, at this time, the A'', B'', and C''-phase windings form a star connection and are connected to the bridge-type power inverter.

[0040] In this mode, the working principle of the variable-excitation salient-pole motor is the same as that of the switched reluctance motor under the bipolar control mode, and it has the advantages of large starting torque and high starting efficiency.

[0041] When the variable-excitation salient-pole motor switches from the starting mode to the generating mode, the control terminal of the variable-excitation salient-pole motor winding switching module is powered on. The common terminals of the four single-pole double-throw relays are disconnected from the normally-closed contacts and connected to the normally-open contacts. A star connection is formed among the A, B, and C phase windings of the armature winding W1, and the A', B', and C' phase windings of the field winding W2 are connected in parallel. The field winding W2 is connected to the current regulation circuit Ur to generate an excitation magnetic field.

[0042] The single-pole single-throw relay S5 is closed, and the current regulation circuit Ur composed of an asymmetrical half-bridge circuit is connected to the power supply.

[0043] After the process of switching from the starting mode to the generating mode ends, as Figure 3 shown, the W2 winding is connected to the current modulation module composed of an asymmetrical half-bridge to generate an excitation magnetic field. At this time, the operating principle of the variable-excitation motor is the same as that of the doubly salient electro-magnetic motor, and it operates in the generating mode.

[0044] Figure 4 FIG. is a schematic structural diagram of the variable-excitation salient-pole motor adopted in an embodiment of the present application. Both the stator and rotor of this motor have a doubly salient structure. The A', B', and C' phase coils marked in the figure are field windings, and the A, B, and C phase coils are armature windings. The motor adopts concentrated windings. The winding directions of adjacent stator poles are opposite, the coupling between adjacent stator poles is strong, and the mutual inductance between phases is strong.

[0045] In summary, the embodiment of the present application provides a variable-excitation salient-pole motor winding switching module based on a bridge-type power converter. When the variable-excitation salient-pole motor is in a preset mode, the motor controller MCU provides a winding switching signal to the variable-excitation salient-pole motor module to control the variable-excitation salient-pole motor to realize the switching between two modes: the switched reluctance motor starting mode and the doubly salient electro-magnetic motor generating mode. The winding switching module is composed of 4 single-pole double-throw relays and a single-pole single-throw relay S5. It is characterized in that the armature winding W1 and the field winding W2 are connected. By means of manual or automatic control, the connection mode of the outgoing line end of the winding switching module is controlled to enable the variable-excitation salient-pole motor to operate in the switched reluctance motor mode during electric operation and in the doubly salient electro-magnetic motor mode during generating operation.

Claims

1. A winding switching module for a variable-excitation salient-pole motor based on a bridge-type power converter, which is composed of a first single-pole double-throw relay, a second single-pole double-throw relay, a third single-pole double-throw relay, a fourth single-pole double-throw relay, and a single-pole single-throw relay, and is characterized in that: The variable-excitation salient-pole motor system has an armature winding composed of three-phase windings A, B, and C, an excitation winding composed of three-phase windings A', B', and C', a power inverter composed of a bridge circuit, and a current regulation circuit composed of an asymmetric half-bridge circuit; The three-phase output terminals of the power inverter are respectively connected to the first ends of the A-phase, B-phase, and C-phase of the armature winding; The first output terminal of the asymmetric half-bridge circuit is connected to the first end of the A'-phase of the excitation winding, and the second output terminal is connected to the neutral point of the A'-phase, B'-phase, and C'-phase of the excitation winding; The common terminal of the first single-pole double-throw relay is connected to the tail end of the A-phase winding of the armature winding. The normally closed contact H1 of the first single-pole double-throw relay is connected to the normally closed contact H3 of the third single-pole double-throw relay. The normally open contact O1 of the first single-pole double-throw relay is connected to the tail end of the B-phase winding of the armature winding; The common terminal of the second single-pole double-throw relay is connected to the tail end of the C-phase winding of the armature winding. The normally closed contact H2 of the second single-pole double-throw relay is connected to the normally open contact O4 of the fourth single-pole double-throw relay. The normally open contact O2 of the second single-pole double-throw relay is connected to the tail end of the B-phase winding of the armature winding; The common terminal of the third single-pole double-throw relay is connected to the first end of the A'-phase winding of the excitation winding. The normally closed contact H3 of the third single-pole double-throw relay is connected to the normally closed contact H1 of the first single-pole double-throw relay. The normally open contact O3 of the third single-pole double-throw relay is connected to the first end of the B'-phase winding of the excitation winding; The common terminal of the fourth single-pole double-throw relay is connected to the first end of the B'-phase winding of the excitation winding. The normally closed contact of the fourth single-pole double-throw relay is connected to the tail end of the B-phase winding of the armature winding. The normally open contact of the fourth single-pole double-throw relay is connected to the first end of the C'-phase winding of the excitation winding; The fixed contact of the single-pole single-throw relay is connected to the negative pole of the DC bus of the bridge-type power inverter, and the moving contact is connected to the emitter of the IGBT of the lower arm of the current regulation circuit composed of the asymmetric half-bridge circuit.

2. The winding switching module for a variable-excitation salient-pole motor based on a bridge-type power converter according to claim 1, and is characterized in that: When the variable-excitation salient-pole motor is converted from the power generation mode to the starting mode, the control terminal of the variable-excitation salient-pole motor winding switching module is powered off. The common terminals of the four single-pole double-throw relays are disconnected from the normally open contacts and connected to the normally closed contacts. The single-pole single-throw relay is disconnected, and the current regulation circuit composed of the asymmetric half-bridge circuit is disconnected from the power supply; When the variable-excitation salient-pole motor is converted from the starting mode to the power generation mode, the control terminal of the variable-excitation salient-pole motor winding switching module is powered on. The common terminals of the four single-pole double-throw relays are disconnected from the normally closed contacts and connected to the normally open contacts. The single-pole single-throw relay is closed, and the current regulation circuit composed of the asymmetric half-bridge circuit is connected to the power supply.

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