CN210578319U - One-drive two-hybrid motor driving system - Google Patents

Abstract

The utility model discloses a drive two mixed type motor drive systems, include: the controller comprises a controller, a first driving unit, a second driving unit, a first motor and a second motor, wherein the first driving unit is identical to the second driving unit in structure, the output end of the controller is respectively connected with the first driving unit and the input end of the second driving unit, the output end of the first driving unit is connected with the first motor, and the output end of the second driving unit is connected with the second motor. The utility model discloses the system merges two motor drive systems together, and two motors of a master control simultaneous control, perfect adaptation steering wheel actuating system realize the driver control of two motors, and very have the practicality.

Description

One-drive two-hybrid motor driving system

Technical Field

The utility model relates to a motor drive technical field, more specifically say and relate to a drive two mixed type motor drive systems.

Background

With the progress of science and technology, automation becomes the standard of the industrial field in a plurality of industrial fields, the AGV application in the fields of automatic goods handling and logistics is very wide, a driver on the AGV is an important member for providing power for the AGV, the AGV with different sizes needs to be placed in various sizes, and the one-drive-two hybrid type motor driver provides the best choice for the AGV.

Because AGV's complexity, its structure differentiation is bigger, there is different drive unit at AGV dolly is structural, different unit overall arrangement, when producing AGV dolly, the user hopes on the AGV dolly of the structure of difference, the driver can be very simple installation, and the wiring is simpler, the helm can all appear on general AGV dolly, there are two motors in the structure of helm, one turns to motor and a walking motor, the power of the motor of general walking is bigger, because the motor of walking is carrying whole dolly forward. The user hopes to control the walking motor and also can control the steering motor simultaneously, and when two drivers were controlled, the dolly can have the walking and turn to the response in time inadequately, and control is unified inadequately, and the debugging is more troublesome.

The market needs a one-drive-two hybrid motor drive system, which can combine two motor drive systems together, and one master control controls two motors simultaneously, thus being perfectly suitable for a steering wheel drive system.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model provides a drive two mixed type motor drive systems.

The utility model provides a solution of its technical problem is: a one-drive-two hybrid motor drive system comprising: the device comprises a controller, a first driving unit, a second driving unit, a first motor and a second motor, wherein the first driving unit and the second driving unit have the same structure,

the output end of the controller is respectively connected with the input ends of the first driving unit and the second driving unit, the output end of the first driving unit is connected with the first motor, and the output end of the second driving unit is connected with the second motor.

As a further improvement of the above technical solution, the first driving unit includes 3 driving subunits with the same structure, the driving subunits are respectively connected with U, V, W phases of the first motor, the driving subunits include,

the device comprises an upper bridge signal input module and a lower bridge signal input module, wherein the upper bridge signal input module is connected with a first input end of a level conversion module, a first output end of the level conversion module is connected with an input end of an upper bridge triode push-pull circuit, and an output end of the upper bridge triode push-pull circuit is connected with one end of an upper bridge MOSFET circuit;

the lower bridge signal input module is connected with a second input end of the level conversion module, a second output end of the level conversion module is connected with an input end of a lower bridge triode push-pull circuit, and an output end of the lower bridge triode push-pull circuit is connected with one end of a lower bridge MOSFET circuit;

the other end of the upper bridge MOSFET circuit is connected with the lower bridge MOSFET circuit, the other end of the lower bridge MOSFET circuit is connected with one end of a protection circuit, the other end of the protection circuit is connected with the level conversion module,

the upper bridge MOSFET circuit and the lower bridge MOSFET circuit are respectively provided with an RC buffer circuit, the RC buffer circuit is used for absorbing ringing caused by a line and preventing the upper bridge MOSFET and the lower bridge MOSFET from being burnt,

the bootstrap booster circuit is respectively connected with the level conversion module and the upper bridge triode push-pull circuit.

As a further improvement of the above technical solution, the level conversion module is a FAN7385 chip.

The utility model has the advantages that: the utility model discloses the system merges two motor drive systems together, and two motors of a master control simultaneous control, perfect adaptation steering wheel actuating system realize the driver control of two motors, and very have the practicality.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.

Fig. 1 is a schematic diagram of an overall structure of a hybrid motor driving system of the present invention;

fig. 2 is a structural diagram of the controller controlling the first motor according to the present invention;

fig. 3 is a structural diagram of the driving subunit of the present invention.

Detailed Description

The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the accompanying drawings, so as to fully understand the objects, the features, and the effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention. In addition, all the connection relations mentioned herein do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The utility model discloses each technical feature in the creation can the interactive combination under the prerequisite that does not contradict conflict each other.

Referring to fig. 1, a one-drive two-hybrid type motor driving system includes: a controller 100, a first driving unit 200, a second driving unit 300, a first motor 400, and a second motor 500, wherein the first driving unit 200 has the same structure as the second driving unit 300,

the output end of the controller 100 is connected to the input ends of the first driving unit 200 and the second driving unit 300, respectively, the output end of the first driving unit 200 is connected to the first motor 400, and the output end of the second driving unit 300 is connected to the second motor 500.

Specifically, with reference to fig. 2 and 3, the first-drive-two hybrid motor driving system is mainly applied to 24V and 48V operating voltage systems, during the motor control period, the controller 100 outputs a PWM square wave signal with a level of 3.3V, and then converts the 3.3V level signal into a 15V level signal for driving the MOSFET through a voltage conversion chip inside the driving unit, when the 48V dc brushless motor is driven, the main power source performs voltage inversion through the MOSFET bridge circuit to invert the dc input power source of the system into three-phase ac power, and the output voltage is adjustable, and when the output voltage is adjusted, the rotation speed of the motor is also changed. When the 48V direct current motor is driven, only two MOSFET bridges are needed to drive, one MOSFET bridge is connected to a positive power supply, the other MOSFET bridge is connected to a negative power supply, and different voltages can be output by controlling the switching frequency of the MOSFETs to achieve the purpose of controlling the rotating speed of the direct current motor

As a further improvement of the above technical solution, the first driving unit 200 includes 3 driving subunits 210 with the same structure, the driving subunits 210 are respectively connected to U, V, W phases of the first motor 400, the driving subunits 210 include,

an upper bridge signal input module 211 and a lower bridge signal input module 212, where the upper bridge signal input module 211 is connected to a first input terminal 600 of a level conversion module 213, a first output terminal 610 of the level conversion module 213 is connected to an input terminal of an upper bridge triode push-pull circuit 214, and an output terminal of the upper bridge triode push-pull circuit 214 is connected to one end of an upper bridge MOSFET circuit 215;

the lower bridge signal input module 212 is connected to the second input end 700 of the level shift module 213, the second output end 710 of the level shift module 213 is connected to the input end of the lower bridge triode push-pull circuit 216, and the output end of the lower bridge triode push-pull circuit 216 is connected to one end of the lower bridge MOSFET circuit 217;

the other end of the upper bridge MOSFET circuit 215 is connected to the lower bridge MOSFET circuit 217, the other end of the lower bridge MOSFET circuit 217 is connected to one end of a protection circuit 218, the other end of the protection circuit 218 is connected to the level shift module 213,

the role of the protection circuit 218 is as follows:

because the output of the MOSFET is the motor, the coil in the motor has inductance which stores energy, when the motor is started, the internal inductor reacts to generate a reverse electromotive force, when the upper bridge MOSFET is closed and the lower bridge MOSFET is opened, the internal inductor needs to release energy to generate follow current on the body diode of the MOSFET, freewheeling conditions also occur during commutation of the motor, during which a surge voltage is generated at the power ground of the MOSFET, this voltage is variable, but the surge voltage affects the driver chip, causing erroneous output, a TVS diode and a common diode are added to the power ground to protect the driving chip, when the surge voltage exceeds the breakdown voltage of the TVS diode, the TVS diode clamps the voltage and then is in a low-resistance state to generate a release loop with the common diode, and the surge energy is more quickly consumed due to the voltage drop of the common diode.

The upper bridge MOSFET circuit 215 and the lower bridge MOSFET circuit 217 are respectively provided with an RC buffer circuit 219, the RC buffer circuit 219 is used for absorbing ringing caused by lines, preventing the upper bridge MOSFET and the lower bridge MOSFET from burning,

the boost converter further comprises a bootstrap boost circuit 800, wherein the bootstrap boost circuit 800 is respectively connected to the level conversion module 213 and the upper bridge triode push-pull circuit 214.

The function of the bootstrap boost circuit 800 is as follows,

the MOSFET has three electrodes, namely a grid electrode, a source electrode and a drain electrode, according to the conduction condition of the MOSFET, the MOS tube adopted by the embodiment is an NMOS tube, and the NMOS tube needs to add forward voltage drop between the grid electrode and the source electrode, so that the MOSFET is conducted. The source of the MOSFET of the lower bridge is connected to the ground, so that a forward voltage drop is directly applied to the gate, the MOS transistor of the lower bridge is turned on, but the source of the MOSFET of the upper bridge is not directly connected to the ground and belongs to a floating ground, at this moment, the bootstrap voltage boosting circuit 800 is needed to maintain the MOSFET of the upper bridge to be turned on, at the moment when the lower bridge is turned on, the source of the upper bridge is changed into a low level, at this moment, the bootstrap capacitor is charged, when the lower bridge MOSFET is turned off, the voltage of the floating ground is changed into a power supply voltage, when the upper bridge MOSFET is turned off, one end of the bootstrap capacitor is connected to a driving power supply connected to the floating ground, at this moment, the voltage on the bootstrap capacitor is increased by the driving power supply voltage plus the power supply voltage on the MOSFET, at this moment, the source of the MOSFET of the upper bridge is the power supply voltage plus.

Specifically, the controller 100 outputs three different sets of commutation signals in an electrical cycle when the motor rotates, and the difference between the three different sets of commutation signals is about 1us, which is a commutation dead zone. When a U-phase driving circuit and a W-phase driving circuit are controlled, an upper bridge MOSFET of the U-phase is conducted, a lower bridge MOSFET of the W-phase is conducted, a power supply returns to the ground through coils of the U-phase and the W-phase inside the motor to form a conducting loop, a stator with a permanent magnet is arranged inside the motor, and when current exists in the U-phase and the W-phase, a magnetic field is generated to repel the magnetic field on the stator to generate a rotating acting force, so that an armature rotates. The upper bridge of the U phase is closed, the upper bridge of the V phase is opened, the V phase and the W phase form a loop, a rotating force is generated, and when the phase line is controlled to be conducted, a conducting common phase is always formed. And controlling the MOSFET of the driving part to be switched on and off, and enabling the phase line of the motor to be sequentially conducted with a power supply and the ground, so that the motor can rotate. Hall position sensors are arranged in the motor, the installation positions of most of the Hall position sensors of the motor are 120 degrees, and when the armature rotates, the controller 100 controls the on and off of the MOSFET by feeding back the angle of the armature through the Hall position sensors, so that the three phase lines are commutated.

As a further improvement of the above technical solution, the level conversion module 213 is a FAN7385 chip.

While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments shown, but is capable of various modifications and substitutions without departing from the spirit of the invention.

Claims (3)

1. A one-drive-two hybrid motor drive system, comprising: the device comprises a controller, a first driving unit, a second driving unit, a first motor and a second motor, wherein the first driving unit and the second driving unit have the same structure,

the output end of the controller is respectively connected with the input ends of the first driving unit and the second driving unit, the output end of the first driving unit is connected with the first motor, and the output end of the second driving unit is connected with the second motor.

2. A one-drive-two hybrid motor drive system as set forth in claim 1, wherein: the first driving unit comprises 3 driving subunits with the same structure, the driving subunits are respectively connected with U, V, W phases of the first motor, the driving subunits comprise,

the device comprises an upper bridge signal input module and a lower bridge signal input module, wherein the upper bridge signal input module is connected with a first input end of a level conversion module, a first output end of the level conversion module is connected with an input end of an upper bridge triode push-pull circuit, and an output end of the upper bridge triode push-pull circuit is connected with one end of an upper bridge MOSFET circuit;

the lower bridge signal input module is connected with a second input end of the level conversion module, a second output end of the level conversion module is connected with an input end of a lower bridge triode push-pull circuit, and an output end of the lower bridge triode push-pull circuit is connected with one end of a lower bridge MOSFET circuit;

the other end of the upper bridge MOSFET circuit is connected with the lower bridge MOSFET circuit, the other end of the lower bridge MOSFET circuit is connected with one end of a protection circuit, the other end of the protection circuit is connected with the level conversion module,

the upper bridge MOSFET circuit and the lower bridge MOSFET circuit are respectively provided with an RC buffer circuit, the RC buffer circuit is used for absorbing ringing caused by a line and preventing the upper bridge MOSFET and the lower bridge MOSFET from being burnt,

the bootstrap booster circuit is respectively connected with the level conversion module and the upper bridge triode push-pull circuit.

3. A one-drive-two hybrid motor drive system as set forth in claim 2, wherein: the level conversion module is a FAN7385 chip.

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