CN207339699U - A kind of two-phase brush DC electronic water pump - Google Patents

Abstract

The utility model discloses a two-phase DC brushless electronic water pump, which comprises a two-phase DC brushless motor, a Hall position sensor, a first switch tube, a second switch tube, a driving circuit, an anti-reverse connection circuit and a control unit; The unit receives instructions from the vehicle controller ECU to realize the speed control of the two-phase brushless DC motor. At the same time, the control unit feeds back the operating status information and fault diagnosis information of the electronic water pump to the vehicle controller ECU. The Hall position sensor detects the rotor position information of the two-phase brushless DC motor and transmits it to the control unit. The control unit controls the first switch tube and the second switch tube through the drive circuit to realize the commutation control of the inverter current and the control of the inverter current. The amplitude control of the inverter current realizes the adjustment of the speed of the two-phase brushless DC motor, and then realizes the adjustment and control of the flow of the electronic water pump. The utility model adopts a two-phase brushless DC motor as the driving motor of the electronic pump, and has the advantages of simple structure and reliable operation.

Description

A two-phase DC brushless electronic water pump

technical field

The utility model relates to an automobile electronic water pump, in particular to a two-phase direct current brushless electronic water pump.

Background technique

At present, traditional mechanical water pumps are mostly used in the cooling system of automobiles. However, with the development of new energy vehicles and the country's increased support for new energy vehicles, more and more pure electric vehicles have been put on the market. Electronic power devices and motors However, the traditional mechanical water pump is not convenient to be used in pure electric vehicles, so the automotive electronic water pump has been widely used and has a very good market prospect.

The utility model patent with authorized notification number CN 205918651 U discloses a new energy vehicle electronic water pump and control system, which has sealed and detachable upper, middle and lower housings. There is a ceramic rotor central shaft in the upper and middle housings, a fixed cover and an upper shaft seat at the upper end, a fixed cover and an upper shaft seat at the lower end, and a rotating ceramic bushing on the outer circumference, which is made as a whole with the water pump impeller body and the water pump impeller cover. The ferrite magnet and the steel plate that the rotor is integrated are fixed on the lower plane of the impeller body of the water pump. Inside the middle and lower housing are the stator and control parts. There are motor drivers composed of MOS tubes, single-chip microcomputers, fault detection, communication modules connected with automotive water pump controllers, etc. It not only solves the high energy consumption and low efficiency of the brushed motor, but also has a good structure waterproof, small and light, and easy maintenance. There is a cover and the water noise is small. Real-time monitoring and troubleshooting of temperature, voltage, current, dry running, stalled and other faults. However, the utility model adopts a three-phase motor, and due to mutual inductance, the rotational speed accuracy of the three-phase motor is not high.

Therefore, it is necessary to provide a new DC brushless electronic water pump for overcoming the problem of low rotational speed accuracy of common three-phase electronic water pumps.

Utility model content

In view of this, the purpose of this utility model is to provide a two-phase DC brushless electronic water pump for the deficiencies of the prior art, using a two-phase brushless DC motor as the drive motor of the electronic pump, and providing a simple structure and reliable operation. Electronic water pump.

In order to achieve the above object, the utility model adopts the following technical solutions:

A two-phase DC brushless electronic water pump, comprising a two-phase DC brushless motor, a Hall position sensor, a first switch tube, a second switch tube, a drive circuit, an anti-reverse connection circuit and a control unit;

The two-phase DC brushless motor is used as a driving motor for an electronic water pump, and the stator of the two-phase DC brushless motor includes a stator first winding and a stator second winding, and the first stator winding and the stator second winding first Both terminals are connected to the positive pole of the vehicle power supply, the tail end of the first winding of the stator is connected to one end of the first switching tube, the tail end of the second winding of the stator is connected to one end of the second switching tube, so The rotor of the two-phase DC brushless motor is connected with the water pump impeller of the electronic water pump;

The output terminal of the Hall position sensor is connected to the control unit, and is used to detect the rotor position information of the two-phase brushless DC motor;

The control end of the first switching tube is connected to the driving circuit, and is used to control the opening and closing of the first winding of the stator;

The control terminal of the second switching tube is connected to the driving circuit, and is used to control the opening and closing of the second winding of the stator;

The input end of the drive circuit is connected to the control unit, and is used to drive the first switch tube and the second switch tube;

One end of the anti-reverse connection circuit is connected to the other end of the first switch tube and the other end of the second switch tube, and the other end of the anti-reverse connection circuit is connected to the negative pole of the vehicle power supply for electronic Fault protection when the positive and negative poles of the water pump and the vehicle power supply are reversed;

The control unit is connected with the vehicle controller ECU of the automobile to realize the speed control and fault diagnosis feedback function of the two-phase brushless DC motor, and at the same time receive the rotor position information output by the Hall position sensor to realize Commutation control of the working current of the two-phase DC brushless motor.

Preferably, the first switch tube and the second switch tube are respectively composed of a first N-channel field effect transistor and a second N-channel field effect transistor, and the first N-channel field effect transistor and the second N-channel field effect transistor The gates of are all connected to the drive circuit.

Preferably, the anti-reverse connection circuit is composed of a third N-channel field effect transistor, a first resistor and a second resistor, one end of the third N-channel field effect transistor is connected to the negative pole of the vehicle power supply, and the first One end of the first resistor and the second resistor are connected to the control terminal of the third N-channel field effect transistor, the other end of the first resistor is connected to the positive pole of the vehicle power supply, the other end of the second resistor, the The other end of the third N-channel field effect transistor and the other end of the first N-channel field effect transistor are both connected to the other end of the second N-channel field effect transistor.

Preferably, the control unit is connected with the vehicle controller ECU of the automobile through a PWM communication interface, a LIN communication interface or a CAN communication interface.

The beneficial effects of the utility model are:

The electronic water pump of the utility model adopts a three-phase motor. Due to the mutual inductance, the speed accuracy of the three-phase motor is not high. A two-phase DC brushless electronic water pump is provided, including a two-phase DC brushless motor, a Hall Position sensor, first switching tube, second switching tube, driving circuit, anti-reverse connection circuit and control unit; wherein, the two-phase DC brushless motor is used as the driving motor of the electronic water pump, and the stator of the two-phase DC brushless motor includes a stator The first winding and the second winding of the stator, the first end of the first winding of the stator and the second winding of the stator are connected with the positive pole of the vehicle power supply, the tail end of the first winding of the stator is connected with one end of the first switching tube, and the end of the second winding of the stator The tail end is connected to one end of the second switch tube, the rotor of the two-phase brushless DC motor is connected to the water pump impeller of the electronic water pump; and the output end of the Hall position sensor is connected to the control unit for detecting the position of the two-phase brushless DC motor. Rotor position information; at the same time, the control terminal of the first switch tube is connected to the drive circuit to control the opening and closing of the first winding of the stator; and the control terminal of the second switch tube is connected to the drive circuit to control the second winding of the stator. The winding is turned on and off; in addition, the input end of the drive circuit is connected to the control unit for driving the first switch tube and the second switch tube; one end of the anti-reverse connection circuit is connected to the other end of the first switch tube and the second switch tube The other end of the anti-reverse connection circuit is connected to the negative pole of the vehicle power supply, which is used for fault protection when the electronic water pump and the vehicle power supply are connected in reverse; the control unit is connected to the vehicle controller ECU of the car, Realize the speed control and fault diagnosis feedback function of the two-phase brushless DC motor, and at the same time receive the rotor position information output by the Hall position sensor, and realize the commutation control of the working current of the two-phase brushless DC motor.

The utility model adopts the advantage of the two-phase brushless DC motor in that its armature windings are perpendicular to each other, there is no mutual inductance, and the zero-crossing point of its back EMF signal is the zero point voltage of the actual circuit, so the two-phase motor The accuracy is better than that of three-phase motors. When operating under the same drive control circuit, the speed accuracy of the two-phase brushless DC motor is at least an order of magnitude higher than that of the three-phase motor.

The utility model proposes a two-phase DC brushless electronic water pump. The control unit receives the instructions sent by the vehicle controller ECU to realize the speed control of the two-phase DC brushless motor. and fault diagnosis information are fed back to the vehicle controller ECU. The Hall position sensor detects the rotor position information of the two-phase brushless DC motor and transmits it to the control unit. The control unit controls the first switch tube and the second switch tube through the drive circuit to realize the commutation control of the inverter current and the control of the inverter current. The amplitude control of the inverter current realizes the adjustment of the speed of the two-phase DC brushless motor, and then realizes the adjustment and control of the flow of the electronic water pump.

The utility model proposes a two-phase DC brushless electronic water pump, the main power circuit only needs two switch tubes, the realization cost is low, the circuit realization is simple, the control is convenient, and the electronic water pump can work reliably in a wide input voltage range .

Description of drawings

Fig. 1 is a system composition block diagram of the present utility model;

Fig. 2 is a structural schematic diagram of the utility model.

Detailed ways

In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the utility model. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the described embodiments of the present invention belong to the protection scope of the present invention.

As shown in Figures 1 and 2, a two-phase DC brushless electronic water pump includes a two-phase DC brushless motor 1, a Hall position sensor 2, a first switch tube 3, a second switch tube 4, a drive circuit 5, Anti-reverse connection circuit 6 and control unit 7.

The two-phase DC brushless motor 1 is used as a driving motor for an electronic water pump, and the stator of the two-phase DC brushless motor 1 includes a stator first winding 11 and a stator second winding 12, and the stator first winding 11 and the stator The first end of the second winding 12 is connected to the positive pole of the vehicle power supply 8, the tail end of the first stator winding 11 is connected to one end of the first switching tube 3, the tail end of the second stator winding 12 is connected to the One end of the second switching tube 4 is connected, and the rotor 13 of the two-phase brushless DC motor 1 is connected with the water pump impeller 9 of the electronic water pump.

The output terminal of the Hall position sensor 2 is connected with the control unit 7 for detecting the position information of the rotor 13 of the two-phase brushless DC motor 1 .

The control end of the first switching tube 3 is connected to the drive circuit 5 for controlling the on and off of the first winding 11 of the stator.

The control end of the second switching tube 4 is connected to the drive circuit 5 for controlling the on and off of the second winding 12 of the stator.

The input terminal of the driving circuit 5 is connected with the control unit 7 for driving the first switch tube 3 and the second switch tube 4 .

One end of the anti-reverse connection circuit 6 is connected to the other end of the first switch tube 3 and the other end of the second switch tube 4, and the other end of the anti-reverse connection circuit 6 is connected to the negative pole of the vehicle power supply 8 The connection is used for fault protection when the positive and negative poles of the electronic water pump and the vehicle power supply 8 are reversely connected.

The control unit 7 is connected to the vehicle controller ECU10 of the automobile to realize the speed control and fault diagnosis feedback function of the two-phase brushless DC motor 1, and simultaneously receive the rotor 13 output from the Hall position sensor 2 The position information realizes the commutation control of the working current of the two-phase brushless DC motor 1 .

The first switching tube 3 and the second switching tube 4 are respectively composed of a first N-channel field effect transistor 3a and a second N-channel field effect transistor 4a, and the first N-channel field effect transistor 3a and the second N-channel field effect transistor The gates of the effect transistors 4 a are all connected to the drive circuit 5 .

The anti-reverse connection circuit 6 is composed of a third N-channel field effect transistor 61, a first resistor 62 and a second resistor 63, one end of the third N-channel field effect transistor 61 is connected to the negative pole of the vehicle power supply 8, Both ends of the first resistor 62 and the second resistor 63 are connected to the control end of the third N-channel field effect transistor 61, and the other end of the first resistor 62 is connected to the positive pole of the vehicle power supply 8, and the The other end of the second resistor 63, the other end of the third N-channel field effect transistor 61 and the other end of the first N-channel field effect transistor 3a are all connected to the other end of the second N-channel field effect transistor 4a.

The control unit 7 is connected with the vehicle controller ECU 10 of the automobile through a PWM communication interface.

In this embodiment, the control unit is connected to the vehicle controller ECU of the vehicle through the PWM communication interface. Obviously, other communication interfaces, such as LIN communication interface or CAN communication interface, can also achieve the same effect.

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 (4)

1. A kind of 1. two-phase brush DC electronic water pump, it is characterised in that：Sensed including two phase DC brushless motors, hall position Device, first switch pipe, second switch pipe, drive circuit, reverse-connection preventing circuit and control unit；

   Two phase DC brushless motor is used as the driving motor of electronic water pump, and the stator of two phase DC brushless motor includes The second winding of the first winding of stator and stator, the head end of first winding of stator and the second winding of stator with vehicle power supply Cathode connects, and the tail end of first winding of stator is connected with one end of the first switch pipe, second winding of stator Tail end is connected with one end of the second switch pipe, the rotor of two phase DC brushless motor and the water pump vane of electronic water pump Connection；

   The output terminal of the hall position sensor is connected with described control unit, for detecting turning for two phase DC brushless motors Sub- positional information；

   The control terminal of the first switch pipe is connected with the drive circuit, for control first winding of stator open with Shut-off；

   The control terminal of the second switch pipe is connected with the drive circuit, for control second winding of stator open with Shut-off；

   The input terminal of the drive circuit is connected with described control unit, for driving the first switch pipe and second switch Pipe；

   One end of the reverse-connection preventing circuit is connected with the other end of the first switch pipe other end and the second switch pipe, institute The other end for stating reverse-connection preventing circuit is connected with the anode of the vehicle power supply, for electronic water pump and vehicle power supply positive and negative anodes reversal connection When error protection；

   The entire car controller ECU connections of described control unit and automobile, realize the rotating speed control to two phase DC brushless motor System and fault diagnosis feedback function, while receive the rotor position information of the hall position sensor output, realization pair The commutation control of the two phase DC brushless motors operating current.
2. A kind of 2. two-phase brush DC electronic water pump according to claim 1, it is characterised in that：The first switch pipe and Second switch pipe is made of the first N-channel field-effect tube and the second N-channel field-effect tube respectively, the first N-channel field-effect Pipe and the grid of the second N-channel field-effect tube are connected with the drive circuit.
3. A kind of 3. two-phase brush DC electronic water pump according to claim 2, it is characterised in that：The reverse-connection preventing circuit by 3rd N-channel field-effect tube, first resistor and second resistance are formed, one end and the car of the 3rd N-channel field-effect tube Carry the anode connection of power supply, the control of one end of the first resistor and second resistance with the 3rd N-channel field-effect tube End connection, the other end of the first resistor is connected with the vehicle power supply cathode, the other end of the second resistance, described the The other end of three N-channel field-effect tube and the other end of the first N-channel field-effect tube with the second N-channel field-effect tube The other end connects.
4. A kind of 4. two-phase brush DC electronic water pump according to claim 1, it is characterised in that：Described control unit passes through The entire car controller ECU connections of PWM communication interfaces, LIN communication interfaces or CAN communication interface and automobile.