CN208073729U - A kind of electronic water pump for automobile based on switched reluctance machines - Google Patents

Abstract

The utility model discloses a kind of electronic water pump for automobile based on switched reluctance machines, including：Central processing module, driving circuit, power conversion circuit, driving motor, current sensor, position sensor, driving motor is that switched reluctance machines include stator and rotor, the head end of the winding of the stator is connected with the anode of vehicle power supply, the end of the winding of the stator is connected with the second input terminal of power conversion circuit, and the center driving of the rotor connects impeller.The utility model uses driving motor of the switched reluctance machines as electronic pump, simplifies the structure of electronic water pump for automobile, effectively improves the reliability during its use.

Description

An automotive electronic water pump based on switched reluctance motor

technical field

The utility model belongs to the technical field of auto parts, in particular to an automotive electronic water pump based on a switched reluctance motor.

Background technique

With the development of new energy vehicles and the country's increased support for new energy vehicles, more and more pure electric vehicles are put on the market, and the heat dissipation of electronic power devices and motors needs to be cooled. However, traditional mechanical water pumps are not convenient. Used in pure electric vehicles, so automotive electronic water pumps have been widely used and have very good market prospects.

Authorized notification number CN103452858B discloses an automotive electronic cooling water pump, which includes a housing, a motor shaft, a stator, and a rotor disposed in the hollow inner cavity of the stator. The stator is disposed on the inner wall of the housing. Can rotate, the impeller is located in the flow channel between the water inlet port and the water outlet port, the housing is provided with a control controller capable of driving the rotor to rotate, the rotor and the impeller are injection molded as one to form an injection molded part, the injection molding The axial part is hollow to form a through hole for assembling with the motor shaft. The disadvantage of this structure is that the electronic water pump chooses a permanent magnet motor as the driving motor, and the complexity of its structure will inevitably lead to high cost, high failure rate and short service life.

As a new type of motor, the switched reluctance motor has a simpler structure than any other motor and has the following advantages:

(1) The motor has a simple structure and is suitable for reliable operation under harsh conditions. The rotor of the switched reluctance motor has no slip rings, windings and permanent magnets, etc. It has many advantages such as simple and solid structure, high reliability, low cost, high efficiency, and low temperature rise. It is suitable for various harsh, high temperature and even strong vibration environments. Very suitable as a drive motor;

(2) The torque direction has nothing to do with the winding current direction of the stator, and only one-way current excitation is required, so the number of switching devices in the power converter can be reduced and the system cost can be reduced;

(3) Each switching device in the switched reluctance motor drive system is directly connected in series with the winding, fundamentally avoiding the through-short circuit phenomenon, thus simplifying the requirements of the control and protection unit, which not only reduces the cost, but also has high reliability . From the point of view of the control structure, the windings of each phase work independently of each other, so the system can run without a phase and has strong fault tolerance;

(4) There are many controllable parameters and good speed regulation performance. There are four main parameters of switched reluctance motor speed regulation: turn-on angle, turn-off angle, phase current amplitude and phase winding voltage. There are many controllable parameters, which means that the control is flexible and convenient. Using different control methods and parameter values can not only make the system work in the best state (such as maximum output, highest efficiency, etc.), but also make it realize various functions and specific characteristic curves, such as making the motor have exactly the same four Quadrant operation (forward, reverse, electric, braking) capability, and has high starting torque and load capacity curve of series-wound motor;

(5) It has high output and high efficiency in a wide range of speed and power, and is suitable for frequent start and stop and forward and reverse operation.

Utility model content

In order to solve the above problems, the utility model proposes an automotive electronic water pump based on a switched reluctance motor, which uses a switched reluctance motor as the driving motor of the electronic pump, simplifies the structure of the automotive electronic water pump, and effectively improves its reliability during use .

In order to achieve the above object, the technical solution adopted by the utility model is:

An automotive electronic water pump based on a switched reluctance motor, the electronic water pump comprising:

A central processing module, the central processing module includes a first input terminal, a first output terminal, a second input terminal, a second output terminal and a third input terminal, the output terminal of the vehicle controller ECU is connected to the first input terminal of the central processing module The input end is connected, and the first output end of the central processing module is connected with the input end of the vehicle controller ECU;

a driving circuit, the second output terminal of the central processing module is connected to the input terminal of the driving circuit;

A power conversion circuit, the power conversion circuit includes an output terminal, a first input terminal and a second input terminal, and the output terminal of the drive circuit is connected to the first input terminal of the power conversion circuit;

Drive motor, the drive motor is a switched reluctance motor, the switched reluctance motor includes a stator and a rotor, the first end of the winding of the stator is connected to the positive pole of the vehicle power supply, the end of the winding of the stator is connected to the power conversion The second input end of the circuit is connected, and the central drive of the rotor is connected to the impeller;

A current sensor, the current sensor includes an input terminal, a first output terminal and a second output terminal, the input terminal of the current sensor is connected to the output terminal of the power conversion circuit, the first output terminal of the current sensor is connected to the vehicle power supply The negative pole is connected, and the second output terminal of the current sensor is connected with the second input terminal of the central processing module;

A position sensor for detecting rotor position information of the switched reluctance motor, the output end of the position sensor is connected to the third input end of the central processing module.

Further, the power conversion circuit includes a plurality of asymmetric bridge circuits.

Further, the position sensor is composed of a photoelectric encoder.

Further, the central processing module is connected with the vehicle controller ECU of the vehicle through a PWM communication bus, a LIN communication bus or a CAN communication bus.

Further, the switched reluctance motor is a stator winding three-phase motor including A-phase winding coils, B-phase winding coils and C-phase winding coils, and the power conversion circuit includes a positive DC bus, a negative DC bus, capacitors C1, A Phase power conversion circuit, B-phase power conversion circuit and C-phase power conversion circuit, the positive DC bus is connected to the positive pole of the vehicle power supply, the negative DC bus is connected to the input end of the current sensor, the capacitor C1 is the DC bus energy storage capacitor, and the capacitor C1 The positive pole is connected to the positive DC bus, and the negative pole of capacitor C1 is connected to the negative DC bus; the A-phase power conversion circuit includes switching devices VT1, VT2 and diodes D1, D2, the drain of switching device VT1 is connected to the positive DC bus, and the drain of switching device VT1 The source is respectively connected to the first end of the stator A-phase winding coil and the cathode of the diode D1, the anode of the diode D1 is connected to the negative DC bus, and the drain of the stator switching device VT2 is respectively connected to the end of the A-phase winding coil and the anode of the diode D2 , the cathode of diode D2 is connected to the positive DC bus; diode D1 and diode D2 play a freewheeling role during the off period of switching device VT1 and switching device VT2, and return the electromagnetic energy of the A-phase winding coil to the vehicle power supply; B-phase power conversion circuit Including switching devices VT3, VT4 and diodes D3 and D4, the drain of switching device VT3 is connected to the positive DC bus, the source of switching device VT3 is respectively connected to the first end of the stator B-phase winding coil and the cathode of diode D3, the diode D3 The anode is connected to the negative DC bus, the drain stator of the switching device VT4 is respectively connected to the end of the B-phase winding coil and the anode of the diode D4, and the cathode of the diode D4 is connected to the positive DC bus; the diode D3 and the diode D4 are connected between the switching device VT3 and the switch The device VT4 plays a freewheeling role during the off period, and returns the electromagnetic energy of the B-phase winding coil to the vehicle power supply; the C-phase power conversion circuit includes switching devices VT5, VT6 and diodes D5, D6, and the drain and positive DC bus of the switching device VT5 connection, the source of the switching device VT5 is connected to the first end of the stator C-phase winding coil and the cathode of the diode D5, the anode of the diode D5 is connected to the negative DC bus, and the drain of the switching device VT6 is respectively connected to the end of the C-phase winding coil of the stator 1. The anode of the diode D6 is connected, and the cathode of the diode D6 is connected to the positive DC bus; the diode D5 and the diode D6 play a freewheeling role during the off period of the switching device VT5 and the switching device VT6, and return the electromagnetic energy of the C-phase winding coil to the vehicle power supply .

Further, the switching devices VT1, VT2, VT3, VT4, VT5, and VT6 are N-channel field effect transistors and their gates are connected to the driving circuit.

The beneficial effects of the utility model are:

The working principle of the utility model is as follows: firstly, the central processing module receives the instructions sent by the vehicle controller ECU through the communication bus, and realizes the speed control of the switched reluctance motor through the closed-loop control algorithm of the speed. The running status information and fault diagnosis information are fed back to the vehicle controller ECU; the position sensor detects the rotor position information of the switched reluctance motor and transmits it to the central processing module; the current sensor detects the winding current of the stator of the switched reluctance motor and transmits it to the central processing module Module, the central processing module controls the power conversion circuit through the drive circuit, realizes the commutation control and current amplitude control of the stator current, and changes the electromagnetic torque of the switched reluctance motor in real time, thereby realizing the speed of the switched reluctance motor. Adjustment, and then realize the adjustment and control of the flow rate of the electronic water pump.

The electronic water pump based on the switched reluctance motor proposed by the utility model has a simple motor structure and is suitable for reliable operation under harsh conditions, which can ensure the reliable operation of the electronic water pump, and has high output and high efficiency in a wide range of speed and power. .

Description of drawings

Fig. 1 is the block diagram of circuit principle of the utility model.

Fig. 2 is a circuit diagram of the utility model power conversion circuit.

Labels in the figure: 1-central processing module, 2-ECU, 3-drive circuit, 4-power conversion circuit, 5-stator, 6-rotor, 7-vehicle power supply, 8-impeller, 9-current sensor, 10-position sensor.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

As shown in Figure 1 and Figure 2, the utility model comprises:

The central processing module 1 adopts an ARM controller or a DSP controller, such as the ARM STM32F103 of ST Company as a main control chip, and the central processing module includes a first input terminal, a first output terminal, a second input terminal, and a second output terminal and the third input terminal, the output terminal of the vehicle controller ECU2 is connected with the first input terminal of the central processing module 1 through the CAN communication bus, and the first output terminal of the central processing module 1 is connected with the vehicle controller ECU2 through the CAN communication bus It is used to receive the rotor position information of the switched reluctance motor output by the position sensor to realize the commutation control of the working current of the switched reluctance motor; to receive the winding current signal of the stator of the switched reluctance motor output by the current sensor , realize the control of the stator current; connect with the whole vehicle controller ECU of the car, realize the speed control and fault diagnosis feedback function of the switched reluctance motor;

The drive circuit 3 is used to drive the power conversion circuit 4, and the second output end of the central processing module 1 is connected to the input end of the drive circuit 3;

The power conversion circuit 4 is used to control the opening and closing of the winding current of the switched reluctance motor stator. The power conversion circuit includes an output terminal, a first input terminal and a second input terminal, and the output terminal of the drive circuit 3 is connected to the power conversion circuit. The first input end of the circuit 4 is connected;

The drive motor, the drive motor is a switched reluctance motor and includes a stator 5 and a rotor 6, the first end of the winding of the stator 5 is connected to the positive pole of the vehicle power supply 7, and the end of the winding of the stator 5 is connected to the second input end of the power conversion circuit 4 Connected, the central transmission of the rotor 6 is connected to the impeller 8;

Current sensor 9, the model that adopts is Hall current sensor ACS712, detects the size of the winding current of switched reluctance motor, and described current sensor comprises input end, first output end and second output end, the input end of current sensor and power The output terminal of the conversion circuit 3 is connected, the first output terminal of the current sensor 9 is connected with the negative pole of the vehicle power supply 7, and the second output terminal of the current sensor 9 is connected with the second input terminal of the central processing module 1;

The position sensor 10 used to detect the position information of the rotor 8 of the switched reluctance motor, the specific model used is Omron absolute position photoelectric encoder E6C3-A, the output end of the position sensor 10 is connected with the third input end of the central processing module 1 .

In this embodiment, the switched reluctance motor is a 6/4-pole three-phase motor, and the stator is a three-phase winding including A-phase winding coil L1, B-phase winding coil L2 and C-phase winding coil L3, and each winding has 2 coils with poles , there are 3 windings in total, and the rotor has 4 poles. As shown in Figure 2, the power conversion circuit includes multiple asymmetric bridge circuits, specifically including positive DC bus, negative DC bus, capacitor C1, A-phase power conversion circuit, B-phase The power conversion circuit and the C-phase power conversion circuit, the switching devices in the asymmetrical bridge are composed of N-channel FETs, the positive DC bus is connected to the positive pole of the vehicle power supply, the negative DC bus is connected to one end of the current sensor, and the capacitor C1 It is a DC bus energy storage capacitor, the positive pole of capacitor C1 is connected to the positive DC bus, and the negative pole of capacitor C1 is connected to the negative DC bus;

A-phase power conversion circuit includes switching devices VT1, VT2 and diodes D1 and D2. Diode D1 and diode D2 play a role of freewheeling during the off period of switching device VT1 and switching device VT2, and return the electromagnetic energy of the A-phase winding coil to the vehicle power supply ; The drain of the switching device VT1 is connected to the positive DC bus, the source of the switching device VT1 is connected to the first end of the stator A phase winding coil and the cathode of the diode D1, the anode of the diode D1 is connected to the negative DC bus, and the switching device VT2 The drain stator is respectively connected to the end of the A-phase winding coil and the anode of the diode D2, and the cathode of the diode D2 is connected to the positive DC bus bar;

The B-phase power conversion circuit includes switching devices VT3, VT4 and diodes D3 and D4. Diode D3 and diode D4 play a freewheeling role during the off-time of switching device VT3 and switching device VT4, and return the electromagnetic energy of the B-phase winding coil to the vehicle power supply. ; The drain of the switching device VT3 is connected to the positive DC bus, the source of the switching device VT3 is connected to the first end of the stator B-phase winding coil and the cathode of the diode D3, the anode of the diode D3 is connected to the negative DC bus, and the switching device VT4 The drain stator is respectively connected to the end of the B-phase winding coil and the anode of the diode D4, and the cathode of the diode D4 is connected to the positive DC bus bar;

The C-phase power conversion circuit includes switching devices VT5, VT6 and diodes D5 and D6. Diode D5 and diode D6 play the role of freewheeling during the off period of switching device VT5 and switching device VT6, and return the electromagnetic energy of the C-phase winding coil to the vehicle power supply. ; The drain of the switching device VT5 is connected to the positive DC bus, the source of the switching device VT5 is respectively connected to the first end of the stator C-phase winding coil and the cathode of the diode D5, the anode of the diode D5 is connected to the negative DC bus, and the switching device VT6 The drain stator is respectively connected to the end of the C-phase winding coil and the anode of the diode D6, and the cathode of the diode D6 is connected to the positive DC bus; the gates of the switching devices VT1, VT2, VT3, VT4, VT5, VT6 are connected to the driving circuit.

The electronic water pump based on the switched reluctance motor proposed by the utility model has a simple motor structure and is suitable for reliable operation under harsh conditions, which can ensure the reliable operation of the electronic water pump, and has high output and high efficiency in a wide range of speed and power. .

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model without limitation, other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the utility model, as long as they do not depart from the technical solution of the utility model The spirit and scope should be included in the claims of the present utility model.

Claims (6)

1. a kind of electronic water pump for automobile based on switched reluctance machines, it is characterised in that：The electronic water pump includes：

Central processing module, the central processing module includes first input end, the first output end, the second input terminal, second defeated Outlet and third input terminal, the output end of entire car controller ECU is connected with the first input end of central processing module, in described First output end of centre processing module is connected with the input terminal of entire car controller ECU；

Driving circuit, the second output terminal of the central processing module are connected with the input terminal of driving circuit；

Power conversion circuit, the power conversion circuit include output end, first input end and the second input terminal, the driving electricity The output end on road is connected with the first input end of power conversion circuit；

Driving motor, the driving motor are switched reluctance machines, and the switched reluctance machines include stator and rotor, described fixed The head end of winding of son is connected with the anode of vehicle power supply, the end of the winding of the stator and the second of power conversion circuit Input terminal is connected, and the center driving of the rotor connects impeller；

Current sensor, the current sensor include input terminal, the first output end and second output terminal, the current sensor Input terminal be connected with the output end of power conversion circuit, the cathode of the current sensor the first output end and vehicle power supply It is connected, the second output terminal of the current sensor is connected with the second input terminal of central processing module；

The position sensor of rotor position information for detection switch reluctance motor, the output end of the position sensor is in The third input terminal of centre processing module is connected.

2. a kind of electronic water pump for automobile based on switched reluctance machines according to claim 1, it is characterised in that：The work( Rate translation circuit includes multiple asymmetric bridge circuits.

3. a kind of electronic water pump for automobile based on switched reluctance machines according to claim 1, it is characterised in that：Institute's rheme Sensor is set to be made of photoelectric encoder.

4. a kind of electronic water pump for automobile based on switched reluctance machines according to claim 1, it is characterised in that：In described Entreat entire car controller ECU connection of the processing module by PWM communication bus, LIN communication bus or CAN communication bus and automobile.

5. a kind of electronic water pump for automobile based on switched reluctance machines according to claim 1, it is characterised in that：It is described to open It includes A phase windings coil, B phase windings coil and C phase winding coils, the work(to close the winding three-phase motor that reluctance motor is stator Rate translation circuit includes positive DC busbar, negative DC busbar, capacitance C1, A phase power conversion circuit, B phases power conversion electricity The anode connection of road and C phase power conversion circuits, positive DC busbar and vehicle power supply, negative DC busbar and current sensor Input terminal be connected, capacitance C1 be DC bus storage capacitor, capacitance C1 anode connect with positive DC busbar, capacitance C1 Cathode connect with negative DC busbar；The A phases power conversion circuit include switching device VT1, VT2 and diode D1, The drain electrode of D2, switching device VT1 are connect with positive DC busbar, the source electrode of switching device VT1 respectively with stator A phase winding coils Head end, diode D1 cathode connection, the anode of diode D1 connect with negative DC busbar, the drain electrode of switching device VT2 Stator is connect with the anode of the end of A phase winding coils, diode D2 respectively, and cathode and the positive DC busbar of diode D2 connect It connects；The B phases power conversion circuit includes switching device VT3, VT4 and diode D3, D4, the drain electrode of switching device VT3 with Positive DC busbar connects, the source electrode of switching device VT3 respectively with the head end of stator B phase winding coils, the cathode of diode D3 Connection, the anode of diode D3 connect with negative DC busbar, the drain electrode stator of switching device VT4 respectively with B phase winding coils End, diode D4 anode connection, the cathode of diode D4 connect with positive DC busbar；The C phases power conversion electricity Road includes switching device VT5, VT6 and diode D5, D6, and the drain electrode of switching device VT5 is connect with positive DC busbar, switch The source electrode of device VT5 is connect with the cathode of the head end of stator C phase winding coils, diode D5 respectively, the anode of diode D5 with Negative DC busbar connects, the drain electrode stator of switching device VT6 respectively with the end of C phase winding coils, the anode of diode D6 Connection, the cathode of diode D6 are connect with positive DC busbar；The grid of switching device VT1, VT2, VT3, VT4, VT5, VT6 with Driving circuit connects.

6. a kind of electronic water pump for automobile based on switched reluctance machines according to claim 5, it is characterised in that：It is described to open It is N-channel field-effect tube to close device VT1, VT2, VT3, VT4, VT5, VT6.