Winding hybrid circuit of switched reluctance motor of electric vehicle

Abstract

The utility model provides a winding hybrid circuit of a switched reluctance motor of an electric automobile. The winding hybrid circuit comprises a first current sensor electrically connected with a first phase winding of the switched reluctance motor of the electric automobile; the second current sensor is electrically connected with a second phase winding of the switched reluctance motor of the electric vehicle; the third current sensor is electrically connected with a third phase winding of the switched reluctance motor of the electric vehicle; the power driving circuit is electrically connected with the first current sensor, the second current sensor and the third current sensor; and the controller is electrically connected with the power driving circuit, and the power driving circuit controls the actual rotating speed of the switched reluctance motor through the first current sensor, the second current sensor and the third current sensor under the control of the controller. The scheme of the utility model can improve the winding performance of the switched reluctance motor of the electric automobile, improve the flexibility and efficiency of speed regulation, and reduce energy consumption.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric automobile motor control technical field, especially point to a kind of electric automobile switched reluctance motor winding hybrid circuit. BACKGROUND

[0002] In electric automobile, switched reluctance motor is widely used by virtue of its simple structure, low cost, strong reliability and other advantages. However, the current switched reluctance motor winding performance has deficiencies, which limits its further development. On the one hand, the traditional winding circuit is not accurate enough in current control, resulting in large motor torque ripple, which affects the driving comfort and operation stability of electric vehicle. On the other hand, under different driving conditions, the speed regulation of the motor is not flexible and efficient enough, which cannot fully exert the performance advantages of switched reluctance motor, and also increases energy consumption. UTILITY MODEL CONTENT

[0003] The technical problem to be solved by the utility model is to provide a kind of electric automobile switched reluctance motor winding hybrid circuit, improve the performance of electric automobile switched reluctance motor winding, and improve the flexibility and efficiency of speed regulation, reduce energy consumption.

[0004] To solve the above technical problems, the technical scheme of the utility model is as follows:

[0005] A kind of electric automobile switched reluctance motor winding hybrid circuit, comprising:

[0006] a first current sensor electrically connected to the first phase winding of the electric automobile switched reluctance motor;

[0007] a second current sensor electrically connected to the second phase winding of the electric automobile switched reluctance motor;

[0008] a third current sensor electrically connected to the third phase winding of the electric automobile switched reluctance motor;

[0009] a power drive circuit electrically connected to the first current sensor, second current sensor and third current sensor;

[0010] a controller electrically connected to the power drive circuit, the power drive circuit controls the actual current and speed of the switched reluctance motor through the first current sensor, second current sensor and third current sensor under the control of the controller;

[0011] The power drive circuit comprises a first winding conversion circuit, which is electrically connected to the first winding of the switched reluctance motor through the first current sensor.

[0012] a second winding transformation circuit in parallel with the first winding transformation circuit, the second winding transformation circuit being electrically connected with a second winding of the switched reluctance motor through the second current sensor;

[0013] a third winding transformation circuit in parallel with the second winding transformation circuit, the third winding transformation circuit being electrically connected with a third winding of the switched reluctance motor through the third current sensor.

[0014] Optionally, the first current sensor is electrically connected with the first winding of the switched reluctance motor through a first resistance; the second current sensor is electrically connected with the second winding of the switched reluctance motor through a second resistance; and the third current sensor is electrically connected with the third winding of the switched reluctance motor through a third resistance.

[0015] Optionally, the first winding transformation circuit comprises:

[0016] a first triode and a first diode in parallel with the first triode, the first triode and the first diode being electrically connected with the first current sensor.

[0017] Optionally, the second winding transformation circuit comprises:

[0018] a second triode and a second diode in parallel with the second triode, the second triode and the second diode being electrically connected with the second current sensor; and the second triode is in parallel with the first diode.

[0019] Optionally, the third winding transformation circuit comprises:

[0020] a third triode and a third diode in parallel with the third triode, the third triode and the third diode being electrically connected with the third current sensor; and the third triode is in parallel with the second diode.

[0021] Optionally, the first current sensor, the second current sensor and the third current sensor each comprise:

[0022] a Hall element;

[0023] a first voltage dividing resistance and a second voltage dividing resistance electrically connected with the Hall element;

[0024] an operational amplifier, a positive input terminal of the operational amplifier being electrically connected with the first voltage dividing resistance, a negative input terminal of the operational amplifier being electrically connected with the second voltage dividing resistance, the positive input terminal of the operational amplifier being electrically connected with an output terminal of the operational amplifier, and the negative input terminal of the operational amplifier being grounded through a target resistance.

[0025] Optionally, the electric vehicle switched reluctance motor winding hybrid circuit further comprises a position detection circuit electrically connected with the switched reluctance motor, wherein the position detection circuit comprises:

[0026] a fourth resistor, a fifth resistor, a sixth resistor, a fourth triode, a fifth triode, a sixth triode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, a first amplifier, a first capacitor, and a second capacitor;

[0027] One end of the fourth resistor is connected with a power supply voltage, the other end is electrically connected with a first output end of the fifth triode and an input end of the first amplifier;

[0028] The input end of the sixth triode is connected with a pulse signal, and is grounded through the sixth resistor, the first capacitor, and the second capacitor, and the first output end is electrically connected with the fifth resistor and the output end of the sixth diode;

[0029] The input end of the fourth triode is electrically connected with the fifth diode, and the output end is electrically connected with the output end of the fifth triode;

[0030] The input end of the fifth triode is electrically connected with the fourth diode, and the fourth diode is electrically connected with the output end of the fifth diode;

[0031] The input end and the output end of the seventh diode are respectively connected with a voltage signal.

[0032] Optionally, the first amplifier is a reverse amplifier, and the fifth resistor is connected with a 12V voltage.

[0033] Optionally, the electric vehicle switched reluctance motor winding hybrid circuit further comprises a current detection circuit electrically connected with the switched reluctance motor, wherein the current detection circuit comprises:

[0034] a seventh resistor, an eighth resistor, a ninth resistor, a second amplifier, an eighth diode, a ninth diode, a third capacitor, a fourth capacitor, and a fifth capacitor;

[0035] One end of the seventh resistor is connected with a current sensor, and the other end is electrically connected with a positive input end of the second amplifier;

[0036] The positive input end of the second amplifier is grounded through the eighth resistor, and the output end and the negative input end are electrically connected with the ninth resistor;

[0037] The third capacitor and the fourth capacitor are connected in series and electrically connected with the second amplifier, and the second amplifier is further grounded through the sixth capacitor;

[0038] The ninth resistor is grounded through the fifth capacitor and the ninth diode.

[0039] Optionally, the ninth diode is connected with 3.3V voltage, and the second amplifier is an operational amplifier.

[0040] The above scheme of the utility model has at least the following beneficial effects:

[0041] The above scheme of the utility model has at least the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 Fig. 1 is a structural schematic diagram of the electric vehicle switched reluctance motor of the utility model;

[0043] Figure 2 Fig. 2 is a mixed circuit schematic diagram of the electric vehicle switched reluctance motor winding of the utility model;

[0044] Figure 3 Fig. 3 is a power drive circuit schematic diagram of the utility model;

[0045] Figure 4 Fig. 4 is a circuit schematic diagram of the current sensor of the utility model;

[0046] Figure 5 Fig. 5 is a position detection circuit schematic diagram of the utility model;

[0047] Figure 6 Fig. 6 is a current detection circuit schematic diagram of the utility model. DETAILED DESCRIPTION

[0048] Exemplary embodiments of the present application will be described herein below with reference to the accompanying drawings. While example embodiments of the present application are illustrated, it is to be understood that the present application can be carried out in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0049] Figure 1The utility model discloses an embodiment of electric automobile switched reluctance motor's cross section structure, include: stator 11, rotor 12, stator 11 and rotor 12 all adopt double salient pole layout. On the stator, the concentrated excitation winding is ingeniously arranged on the mutually symmetrical salient pole, and a phase is formed in series connection. The end of these windings is designed ingeniously, is short and has no interphase cross-over wire, thereby ensuring that the magnetic flux can be concentrated in the magnetic pole area efficiently. When the motor works, the rotating power of the rotor is completely derived from the electromagnetic force generated by the stator winding, and the rotor itself does not carry the structure such as slip ring, winding or permanent magnet. With the continuous change of the rotor position, the magnetic resistance of each phase magnetic circuit also has corresponding dynamic adjustment.

[0050] Figure 1 For three-phase 6 / 4 switched reluctance motor, a phase winding, i.e. A-phase winding, B-phase winding and C-phase winding, is connected in series on the opposite stator salient poles of each phase. The rotor has four salient poles, and no winding coil is arranged on the salient poles. The stator and the rotor salient poles maintain a small air gap.

[0051] When the rotor salient poles 2-4 are aligned with the C-phase salient poles, and the rotor salient poles 1-3 have an angle θ (θ=30°) with the A-phase salient poles, if only the A-phase winding is energized, and the B-phase and C-phase windings are kept in a non-energized state, the A-phase stator will form a symmetrical magnetic field with A-A as the axis. This magnetic field circulates through the stator yoke, the stator salient poles, the rotor salient poles and the rotor yoke. Since the curved magnetic lines generated by the A-phase to A-phase symmetrical magnetic field form a tangential magnetic pulling force in the counterclockwise direction, the force acts on the rotor, pushing the rotor salient poles 1-3 to move towards the direction of the A-phase axis, and further promoting the rotor to rotate in the counterclockwise direction. As the rotor salient pole axis 1-3 gradually approaches the salient pole axis A-A, the rotation process continues.

[0052] As Figure 2 shown, the embodiment of the utility model discloses a kind of electric automobile switched reluctance motor winding hybrid circuit, comprising:

[0053] The first current sensor is electrically connected with the first phase winding A of the electric automobile switched reluctance motor;

[0054] The second current sensor is electrically connected with the second phase winding B of the electric automobile switched reluctance motor;

[0055] The third current sensor is electrically connected with the third phase winding C of the electric automobile switched reluctance motor;

[0056] The power drive circuit is electrically connected with the first current sensor, the second current sensor and the third current sensor;

[0057] A controller electrically connected to the power drive circuit, wherein the power drive circuit, under the control of the controller, controls the actual current and speed of the switched reluctance motor through a first current sensor, a second current sensor, and a third current sensor;

[0058] The power drive circuit includes: a first winding conversion circuit, which is electrically connected to the first winding of the switched reluctance motor through the first current sensor;

[0059] A second winding conversion circuit is connected in parallel with the first winding conversion circuit, and the second winding conversion circuit is electrically connected to the second winding of the switched reluctance motor through the second current sensor;

[0060] A third winding conversion circuit is connected in parallel with the second winding conversion circuit. The third winding conversion circuit is electrically connected to the third winding of the switched reluctance motor through the third current sensor.

[0061] The above-mentioned solution of this utility model controls the current and speed of the switched reluctance motor by means of a power drive circuit and current sensors corresponding to the windings, which can improve the performance of the switched reluctance motor windings of electric vehicles, enhance the flexibility and efficiency of speed regulation, and reduce energy consumption.

[0062] In an optional embodiment of this utility model, the first current sensor is electrically connected to the first winding of the switched reluctance motor through a first resistor R1; the second current sensor is electrically connected to the second winding of the switched reluctance motor through a second resistor R2; and the third current sensor is electrically connected to the third winding of the switched reluctance motor through a third resistor R3.

[0063] In this embodiment, each winding is electrically connected to the power drive circuit through a current sensor, which can divide the voltage input to the winding by the power drive circuit, thereby ensuring the voltage stability of the winding.

[0064] like Figure 3 As shown, in an optional embodiment of this utility model, the first winding conversion circuit includes:

[0065] A first transistor VTA and a first diode DA connected in parallel with the first transistor VTA are both electrically connected to a first current sensor.

[0066] In an optional embodiment of this utility model, the second winding conversion circuit includes:

[0067] The second transistor VTB and the second diode DB are connected in parallel with the second transistor VTB; both the second transistor VTB and the second diode DB are electrically connected to the second current sensor; the second transistor VTB is connected in parallel with the first diode DA.

[0068] In an optional embodiment of this utility model, the third winding conversion circuit includes:

[0069] A third transistor VTC and a third diode DC connected in parallel with the third transistor VTC; both the third transistor VTC and the third diode DC are electrically connected to a third current sensor; the third transistor VTC is connected in parallel with the second diode DB.

[0070] In this embodiment, each phase winding conversion circuit of the power drive circuit is controlled by the operation of switching transistors and diodes, forming the innermost loop of the switched reluctance motor. The current drive accuracy determines the control effect of the outer loop (speed). Specifically, the first winding conversion circuit outputs current aout when the first transistor VTA is turned on under the action of voltage Us; the second winding conversion circuit outputs current bout when the second transistor VTB is turned on under the action of voltage Us; the third winding conversion circuit outputs current cout when the third transistor VTC is turned on under the action of voltage Us; and each current is input to the corresponding winding through the corresponding current sensor.

[0071] like Figure 4 As shown, in an optional embodiment of this utility model, the first current sensor, the second current sensor, and the third current sensor each include:

[0072] Hall element, magnetic core (not shown in the figure) arranged around the Hall element;

[0073] The first voltage divider resistor Rm1 and the second voltage divider resistor Rm2 are electrically connected to the Hall element;

[0074] Operational amplifier Am, the positive input terminal of operational amplifier Am is electrically connected to the first voltage divider resistor Rm1, the negative input terminal is electrically connected to the second voltage divider resistor Rm2, the positive input terminal of operational amplifier is electrically connected to its output terminal, the negative input terminal is grounded through a target resistor Rm3, and the voltage at the output terminal of operational amplifier Am is Vs.

[0075] In this embodiment, a Hall element is used to input the target current, which is then processed by an operational amplifier to output the target voltage, achieving high-voltage and low-voltage isolation. The signal can be directly sampled by the low-voltage circuit. The power supply of the current sensor is DC 5V, which can achieve high current accuracy, good linearity, and high sensitivity.

[0076] like Figure 5As shown, in an optional embodiment of this utility model, the hybrid circuit of the switched reluctance motor winding in an electric vehicle further includes: a position detection circuit electrically connected to the switched reluctance motor, the position detection circuit comprising:

[0077] Fourth resistor R4, fifth resistor R5, sixth resistor R6, fourth transistor V4, fifth transistor V5, sixth transistor V6, fourth diode D4, fifth diode D5, sixth diode D6, seventh diode D7, first amplifier A1, first capacitor C1 and second capacitor C2;

[0078] One end of the fourth resistor R4 is connected to the power supply voltage, and the other end is electrically connected to the first output terminal of the fifth transistor V5 and to the input terminal of the first amplifier A1.

[0079] The input terminal of the hex transistor V6 is connected to a pulse signal and is grounded through the sixth resistor R6, the first capacitor C1 and the second capacitor C2. The first output terminal is electrically connected to the output terminal of the fifth resistor R5 and the sixth diode D6.

[0080] The input terminal of the fourth transistor V4 is electrically connected to the fifth diode D5, and the output terminal is electrically connected to the output terminal of the fifth transistor V5.

[0081] The input terminal of the fifth transistor V5 is electrically connected to the fourth diode D4, and the output terminal of the fourth diode D4 is electrically connected to the fifth diode D5.

[0082] The input and output terminals of the seventh diode D7 are respectively connected to a voltage signal.

[0083] In an optional embodiment of this invention, the first amplifier A1 is an inverting amplifier, and the fifth resistor R5 is connected to a 12V voltage.

[0084] In this embodiment, when the M pulse arrives, the hex transistor V6 is turned on. The pulse is transmitted via optocoupler unit U1 for electro-optical signal transmission. The output port of pin 6 of the fifth transistor V5 is at a low level. After being inverted by the first amplifier A1, the CAP port outputs 1. The optocoupler performance of U1 provides electrical insulation, ensuring that the signal is isolated from the main control board ground. By utilizing the pulse shaping function of the inverting amplifier, the input signal pulse is converted into a smooth, jitter-free output signal pulse, which is more conducive to position detection.

[0085] like Figure 6 As shown, in an optional embodiment of this utility model, the hybrid circuit of the switched reluctance motor winding in an electric vehicle further includes: a current detection circuit electrically connected to the switched reluctance motor, the current detection circuit comprising:

[0086] The seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the second amplifier A2, the eighth diode D8, the ninth diode D9, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5;

[0087] One end of the seventh resistor R7 is connected with a current sensor, and the other end is electrically connected with a positive input end of the second amplifier A2;

[0088] The positive input end of the second amplifier A2 is grounded through the eighth resistor R8, and an output end and a negative input end are electrically connected with the ninth resistor R9;

[0089] The third capacitor C3 and the fourth capacitor C4 are connected in series and electrically connected with the second amplifier A2, and the second amplifier A2 is also grounded through the sixth capacitor C6;

[0090] The ninth resistor R9 is grounded through the fifth capacitor C5 and the ninth diode D9.

[0091] In the optional embodiment of the utility model, the ninth diode D9 is connected with 3.3V voltage, the second amplifier A2 is an operational amplifier, and the voltage U1 from the negative input end to the output end of the operational amplifier A2 is U 2-3 , which guarantees that the signal is not attenuated and distorted, U4 is 15V, the input current is IA, and the current output through the ninth resistor R9 is I1.

[0092] In the embodiment, the current detection is used for estimating the instantaneous torque, the seventh resistor R7 and the eighth resistor R8 play a voltage dividing role, then the voltage signal after voltage division is transmitted to the operational amplifier, which plays a role of constant voltage source for the subsequent circuit, is beneficial to accurate sampling of the current, and the terminal port is connected with 3V voltage stabilizing tube, i.e., the eighth diode D8 and the ninth diode D9, which plays a protection role for the circuit.

[0093] The winding circuit of the utility model realizes more accurate control of motor winding current and speed by improving the power conversion circuit, effectively reduces torque ripple, improves the operation stability and reliability of the motor, and thus improves the overall performance of the winding of the switched reluctance motor. Through current detection, the motor can quickly and accurately respond to the speed command under different driving conditions, improve the flexibility and efficiency of speed regulation, and meet the diversified driving needs of electric vehicles. When applied to electric vehicles, the efficiency of the power conversion circuit is improved, and accurate current and speed control reduces unnecessary energy loss, reduces the energy consumption of the electric vehicle, and prolongs the cruising range of the vehicle.

[0094] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the ordinary in the art, without departing from the principles described in the present application, can be made several improvements and refinements, these improvements and refinements should also be considered as the scope of protection of the present application.

Claims

1. An electric vehicle switched reluctance motor winding hybrid circuit, characterized by, The application relates to an electric vehicle switched reluctance motor control system, which comprises the following components: a first current sensor electrically connected with a first phase winding of an electric vehicle switched reluctance motor; a second current sensor electrically connected with a second phase winding of the electric vehicle switched reluctance motor; a third current sensor electrically connected with a third phase winding of the electric vehicle switched reluctance motor; a power drive circuit electrically connected with the first, second and third current sensors; a controller electrically connected with the power drive circuit, the power drive circuit being controlled by the controller to control the actual current and rotating speed of the switched reluctance motor through the first, second and third current sensors; the power drive circuit comprises a first winding conversion circuit electrically connected with the first winding of the switched reluctance motor through the first current sensor; a second winding conversion circuit electrically connected with the second winding of the switched reluctance motor through the second current sensor in parallel with the first winding conversion circuit; a third winding conversion circuit electrically connected with the third winding of the switched reluctance motor through the third current sensor in parallel with the second winding conversion circuit.

2. The electric vehicle switched reluctance motor winding hybrid circuit of claim 1, wherein, The first current sensor is electrically connected with the first winding of the switched reluctance motor through a first resistor (R1); the second current sensor is electrically connected with the second winding of the switched reluctance motor through a second resistor (R2); and the third current sensor is electrically connected with the third winding of the switched reluctance motor through a third resistor (R3).

3. The electric vehicle switched reluctance motor winding hybrid circuit of claim 1, wherein, The first winding conversion circuit comprises: a first triode (VTA) and a first diode (DA) connected in parallel with the first triode (VTA), both of which are electrically connected with the first current sensor.

4. The electric vehicle switched reluctance motor winding hybrid circuit of claim 3, wherein, The second winding conversion circuit comprises: a second triode (VTB) and a second diode (DB) connected in parallel with the second triode (VTB), both of which are electrically connected with the second current sensor; and the second triode (VTB) is connected in parallel with the first diode (DA).

5. The electric vehicle switched reluctance motor winding hybrid circuit of claim 4, wherein, The third winding conversion circuit comprises: a third triode (VTC) and a third diode (DC) connected in parallel with the third triode (VTC), both of which are electrically connected with the third current sensor; and the third triode (VTC) is connected in parallel with the second diode (DB).

6. The electric vehicle switched reluctance motor winding hybrid circuit of claim 1, wherein, The first, second and third current sensors each comprise: a Hall element; a first voltage dividing resistor (Rm1) and a second voltage dividing resistor (Rm2) electrically connected with the Hall element; an operational amplifier (Am) having a positive input end electrically connected with the first voltage dividing resistor (Rm1), a negative input end electrically connected with the second voltage dividing resistor (Rm2), a positive input end electrically connected with an output end, and a negative input end grounded through a target resistor (Rm3).

7. The electric vehicle switched reluctance motor winding hybrid circuit of claim 1, wherein, The application further comprises: A position detection circuit electrically connected with the switched reluctance motor, the position detection circuit comprising: A fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a fourth triode (V4), a fifth triode (V5), a sixth triode (V6), a fourth diode (D4), a fifth diode (D5), a sixth diode (D6), a seventh diode (D7), a first amplifier (A1), a first capacitor (C1), and a second capacitor (C2); One end of the fourth resistor (R4) is connected to a power supply voltage, the other end is electrically connected with a first output end of the fifth triode (V5), and is electrically connected with an input end of the first amplifier (A1); The input end of the sixth triode (V6) is connected to a pulse signal, and is grounded through the sixth resistor (R6), the first capacitor (C1), and the second capacitor (C2), the first output end is electrically connected with the fifth resistor (R5) and the output end of the sixth diode (D6); The input end of the fourth triode (V4) is electrically connected with the fifth diode (D5), and the output end is electrically connected with the output end of the fifth triode (V5); The input end of the fifth triode (V5) is electrically connected with the fourth diode (D4), and the fourth diode (D4) is electrically connected with the output end of the fifth diode (D5); The input end and the output end of the seventh diode (D7) are respectively connected to a voltage signal.

8. The electric vehicle switched reluctance motor winding hybrid circuit of claim 7, wherein, The first amplifier (A1) is a reverse amplifier, and the fifth resistor (R5) is connected to a 12V voltage.

9. The electric vehicle switched reluctance motor winding hybrid circuit of claim 1, wherein, Further comprising: A current detection circuit electrically connected with the switched reluctance motor, the current detection circuit comprising: A seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a second amplifier (A2), an eighth diode (D8), a ninth diode (D9), a third capacitor (C3), a fourth capacitor (C4), and a fifth capacitor (C5); One end of the seventh resistor (R7) is connected to a current sensor, and the other end is electrically connected with a positive input end of the second amplifier (A2); The positive input end of the second amplifier (A2) is grounded through the eighth resistor (R8), and the output end and the negative input end are electrically connected with the ninth resistor (R9); The third capacitor (C3) and the fourth capacitor (C4) are connected in series and electrically connected with the second amplifier (A2), and the second amplifier (A2) is also grounded through the sixth capacitor (C6); The ninth resistor (R9) is grounded through the fifth capacitor (C5) and the ninth diode (D9).

10. The electric vehicle switched reluctance motor winding hybrid circuit of claim 9, wherein, The ninth diode (D9) is connected to a 3.3V voltage, and the second amplifier (A2) is an operational amplifier.

Images