CN112886900A

CN112886900A - Three-phase switch reluctance motor controller

Info

Publication number: CN112886900A
Application number: CN202110074146.0A
Authority: CN
Inventors: 吴荒原
Original assignee: Wuhan Shenlan Power Technology Co ltd
Current assignee: Wuhan Shenlan Power Technology Co ltd
Priority date: 2021-01-20
Filing date: 2021-01-20
Publication date: 2021-06-01

Abstract

The invention discloses a three-phase switched reluctance motor controller which comprises a microprocessor, a motor phase winding, an H bridge driving circuit, a battery and a driver, wherein the H bridge driving circuit comprises three H bridges connected in parallel, each H bridge comprises two half-bridge structures, each half-bridge structure comprises an IGBT (insulated gate bipolar transistor) tube and a diode connected with the IGBT tube in series in a reverse direction, the IGBT tube is also connected with the diode in parallel in a reverse direction, and each half-bridge structure is also provided with a VCE (voltage regulator) voltage detection terminal and connected with a voltage detection circuit. The special H-bridge topology IGBT is used for reducing the size of the controller, saving the cost and preventing the controller from being damaged in the short circuit process.

Description

Three-phase switch reluctance motor controller

Technical Field

The invention relates to the technical field of switched reluctance motor controllers, in particular to a three-phase switched reluctance motor controller.

Background

The switched reluctance motor is a motor which generates torque by utilizing the non-uniform rotor reluctance, and is also called a reaction type synchronous motor, and the structure and the working principle of the switched reluctance motor are greatly different from those of the traditional alternating current motor and direct current motor. It does not rely on the interaction of the magnetic field produced by the stator and rotor winding current to produce torque, but relies on the principle of minimum magnetic resistance to produce torque, namely: "the magnetic flux is always closed along the path of least reluctance, thereby generating a magnetic pulling force.

As shown in the figure, assuming that the switch S1, S2 is closed when the rotor of the switched reluctance motor is in the position shown in the figure, the phase a winding is energized, the phase is excited by the dc power supply E, a radial magnetic field with A1a2 as an axis is established in the motor, and the magnetic flux is closed by the stator yoke, the stator poles, the air gap, the rotor poles, the rotor yoke, and the like. The magnetic lines of force passing through the air gap are curved, and the magnetic resistance of the magnetic circuit is greater than the magnetic resistance when the magnetic pole axes of the stator and the rotor are coincident, so that the rotor is acted by torque generated by tangential magnetic pull force of the curved magnetic lines of force in the air gap, the axis A1a2 of the rotor magnetic pole moves towards the magnetic pole axis A1a2 of the stator A phase, and is acted by the torque in the direction, namely in the counterclockwise direction. When A1a2 moves to coincide with the A1A2 axis, the reluctance is at a minimum, phase A will not produce torque, and phase A should be switched on, for example phase B, the rotor will rotate counterclockwise by another step angle. If the windings are energized separately in the sequence a-B-C continuously, the motor rotor will rotate continuously in a clockwise direction against the energization sequence. On the contrary, the C-B-A phase is electrified in sequence, and the motor rotates clockwise.

Because switched reluctance motor structure is different from general asynchronous machine or permanent magnet synchronous machine, use half-bridge IGBT to design switched reluctance motor controller and need 6 IGBT modules, can lead to switched reluctance motor controller volume great like this, the cost increases. The existing H-bridge topology IGBT has no VCE voltage detection function of an upper bridge and a lower bridge, can not effectively carry out short-circuit protection on the IGBT under the condition that a motor cable or a wiring terminal and the like are short-circuited, and meanwhile, the existing switched reluctance motor controller has obvious defects in the aspects of temperature control and shock resistance.

Disclosure of Invention

The present invention is directed to a three-phase switched reluctance motor controller to solve the above problems.

In order to achieve the purpose, the invention provides the following technical scheme: a three-phase switched reluctance motor controller comprising:

microprocessor, motor phase winding, H bridge drive circuit, battery and driver, H bridge drive circuit includes three parallelly connected H bridge, every the H bridge all includes two half-bridge structures, every half-bridge structure all includes an IGBT pipe and rather than the diode of series-opposing connection, it has the diode still to connect in parallel reversely on the IGBT pipe, every the half-bridge structure is last still to be provided with VCE voltage detection terminal and to be connected with voltage detection circuit.

Furthermore, the voltage detection circuit comprises a capacitor, a voltage regulator tube, a resistor and a diode which are connected in sequence.

Furthermore, the detection circuit is connected with the microprocessor, when the voltage of the VCE reaches a threshold value, the driving chip is triggered to close the tube, the controller stops working, and the microprocessor sends a reset signal to reset the fault after receiving the fault signal.

Further, the H bridge is also connected with a thermistor.

Furthermore, the device also comprises a heat dissipation mechanism for dissipating heat of each part.

Furthermore, the heat dissipation mechanism is a heat dissipation plate, heat dissipation fins are arranged on the heat dissipation plate, a circulating water channel is formed in the heat dissipation fins in a hollow mode, and cooling water is arranged in the water channel.

Furthermore, the heat dissipation plate is provided with a plurality of mounting holes, studs are arranged in the mounting holes, and damping springs for damping are sleeved on the studs.

Further, be provided with the heat dissipation post on the heating panel, the heat dissipation post is connected with the heat dissipation copper sheet that sets up in the controller outside, the heat dissipation post is the inside and outside post structure of cover together, and wherein inner prop and circulating water channel intercommunication, outer prop and heat dissipation copper sheet offset, are provided with the sealing washer between outer prop and inner prop, and the cover is equipped with the spacing spring that offsets with outer prop tip and heating panel on the inner prop.

Compared with the prior art, the invention has the beneficial effects that: 1. compared with the existing half-bridge IGBT topological controller, the size of the controller can be reduced, and the cost is saved; 2. compared with the conventional H-bridge topology, the power supply has the IGBT short-circuit protection function, and the controller is prevented from being damaged in the short-circuit process; 3. the heat generated by each component is effectively dissipated in time through the heat dissipation mechanism, so that damage caused by overheating is avoided; 4. the damping is carried out on the inner parts of the controller through the springs, and the damage caused by rigid collision is avoided.

Drawings

FIG. 1 is a schematic diagram of an inverter circuit composed of 3H-bridge topology IGBTs according to the present invention;

FIG. 2 is a schematic diagram of an H-bridge topology IGBT circuit according to the invention;

FIG. 3 is a schematic diagram of a voltage detection circuit according to the present invention;

FIG. 4 is a schematic diagram of the short-circuit protection principle of the IGBT of the invention;

FIG. 5 is a flow chart of the control signal of the present invention;

FIG. 6 is a schematic top view of the heat dissipation plate of the present invention;

fig. 7 is a schematic side view of the heat dissipation plate of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, the present invention provides a technical solution: a three-phase switched reluctance motor controller comprising:

microprocessor, motor phase winding, H bridge drive circuit, battery and driver.

As shown in fig. 1, the H-bridge driving circuit includes three H-bridges connected in parallel, and in an inverter circuit formed by 3H-bridge topology IGBTs, a phase winding a is located at a position a1-a2, a phase winding B is located at a position B1-B2, and a phase winding C is located at a position C1-C2, and control is achieved through the three H-bridge topology IGBTs.

As shown in fig. 2, each H-bridge includes two half-bridge structures, each half-bridge structure includes an IGBT and a diode connected in series in reverse, the IGBT is also connected in parallel in reverse, and each half-bridge structure is also provided with a VCE voltage detection terminal and connected to a voltage detection circuit.

As shown in fig. 3, the voltage detection circuit includes a capacitor, a voltage regulator tube, a resistor, and a diode, which are connected in sequence.

As shown in fig. 4 and 5, during operation, the detection circuit is connected to the microprocessor, when the voltage of the VCE is lower than the threshold, the controller operates normally, when a short circuit occurs, the current rises sharply, and the voltage of the VCE exceeds the threshold, the corresponding driving chip in the driver is triggered to shut down, the controller stops operating, and the microprocessor sends out a reset signal to reset the fault after receiving the fault signal.

As shown in fig. 2, a thermistor is also connected to the H-bridge.

As shown in fig. 6 and 7, the three-phase switched reluctance motor controller further includes a heat dissipation mechanism for dissipating heat from each part, the heat dissipation mechanism is a heat dissipation plate 1, the heat dissipation plate is provided with heat dissipation fins 2, the heat dissipation fins are hollow to form a circulating water channel 3, and cooling water is contained in the water channel.

The heat dissipation plate is provided with a plurality of mounting holes 4, studs 5 are arranged in the mounting holes, and damping springs 6 for damping are sleeved on the studs.

Be provided with heat dissipation post 7 on the heating panel 1, the heat dissipation post is connected with the heat dissipation copper sheet 8 that sets up in the controller outside, the heat dissipation post is the inside and outside post structure of cover together, and wherein inner prop 71 and circulating water channel intercommunication, outer prop 72 offsets with the heat dissipation copper sheet, is provided with sealing washer 73 between outer prop and inner prop, and the cover is equipped with the spacing spring 74 that offsets with outer prop tip and heating panel on the inner prop.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a three-phase switch reluctance machine controller, includes microprocessor, motor phase winding, H bridge drive circuit, battery and driver, its characterized in that: the H-bridge driving circuit comprises three parallel H-bridges, each H-bridge comprises two half-bridge structures, each half-bridge structure comprises an IGBT (insulated gate bipolar transistor) tube and a diode connected with the IGBT tube in series in a reverse direction, the IGBT tube is also connected with the diode in parallel in a reverse direction, and each half-bridge structure is also provided with a VCE (voltage regulator) voltage detection terminal and is connected with a voltage detection circuit.

2. The controller according to claim 1, wherein the voltage detection circuit comprises a capacitor, a voltage regulator tube, a resistor and a diode connected in sequence.

3. The controller of claim 2, wherein the detection circuit is connected to the microprocessor, and when the VCE voltage rises to a threshold, the detection circuit triggers the driving chip to shut down, the controller stops working, and the microprocessor sends a reset signal to reset the fault after receiving the fault signal.

4. The controller according to claim 1, wherein a thermistor is further connected to the H-bridge.

5. The controller according to claim 1, further comprising a heat dissipation mechanism for dissipating heat from each of the parts.

6. The controller according to claim 5, wherein the heat dissipation mechanism is a heat dissipation plate, and the heat dissipation plate is provided with a heat dissipation fin, the heat dissipation fin is hollow to form a circulating water channel, and the water channel is filled with cooling water.

7. The controller according to claim 6, wherein the heat sink has a plurality of mounting holes, the mounting holes have studs, and the studs are sleeved with damping springs for damping.

8. The controller according to claim 7, wherein the heat sink plate is provided with a heat dissipating stud connected to a heat dissipating copper sheet disposed outside the controller, the heat dissipating stud is of a sleeved structure with an inner stud and an outer stud, the inner stud is communicated with the circulating water channel, the outer stud abuts against the heat dissipating copper sheet, a sealing ring is disposed between the outer stud and the inner stud, and the inner stud is sleeved with a limiting spring abutting against an end of the outer stud and the heat sink plate.