CN106788117B - Electric drive device and electric apparatus - Google Patents
Electric drive device and electric apparatus Download PDFInfo
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- CN106788117B CN106788117B CN201710068398.6A CN201710068398A CN106788117B CN 106788117 B CN106788117 B CN 106788117B CN 201710068398 A CN201710068398 A CN 201710068398A CN 106788117 B CN106788117 B CN 106788117B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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Abstract
The invention provides an electric drive device and an electric apparatus. The invention provides an electric driving device, which is arranged in electric equipment and used for driving the electric equipment, and comprises: a multiphase ac motor; a direct current power supply; an instruction transmitting unit; a current sensor; an output sensor; a controller; a driver; the DC power supply is provided with j battery units which are mutually independent and have the same parameters, j inverter units are correspondingly connected, j driving units which are mutually independent and have the same parameters are respectively connected with the j inverter units, k is a positive integer greater than 2, and j is a positive integer greater than 1.
Description
Technical Field
The invention belongs to the field of alternating current motors, and particularly relates to an electric driving device and electric equipment comprising the same.
Background
With the increase of haze days and duration of various large cities, the national exhaust emission management of fuel equipment is more and more strict; in addition, in the closed indoor working environment, the fuel equipment is forbidden to use; furthermore, petroleum is a non-renewable source of energy, which is depleted decades later. Accordingly, electric devices using electricity as an energy source, such as electric automobiles, electric forklifts, and the like, are increasingly favored by manufacturers and consumers. The device has the advantages of small pollution, capability of providing electric energy through renewable energy sources, high energy utilization rate, simple structure, small noise, good dynamic performance, high portability and the like compared with fuel oil equipment. Under the situation that petroleum resources are more and more tense, electric driving devices, in particular to high-power electric driving devices such as electric combat vehicles, electric warships, electric aircrafts, electric driven aircraft carriers and the like, have profound significance for national defense safety.
The battery is a core component of the electric equipment, and because of the limitation of the current battery manufacturing technology level, the battery monomer still cannot meet the actual requirements of the electric equipment in terms of capacity, voltage and performance, and in order to meet the requirements of a high-energy power supply of the electric equipment, the battery monomer is generally used in groups in a serial-parallel connection mode so as to meet the power requirement of a larger load. The output current of the battery pack is increased through the parallel connection of the battery cells, and the output voltage of the battery pack is increased through the serial connection of the battery cells.
In the electric automobile industry, a battery energy storage system of a pure electric passenger car generally comprises 96-110 lithium ion batteries with the capacity of about 45-80 Ah; the battery energy storage system of the pure electric bus generally has 150-200 lithium ion batteries with the capacity of about 200-400 Ah. Mining electric locomotives are basically powered by several groups of battery packs in parallel, each group of battery packs being grouped in series by tens of power conservation Chi Shanti. The domestic electric automobile vehicle-mounted battery mostly adopts a connection mode that battery monomers are connected in parallel and then connected in series.
According to the requirements of the national standard, the safety voltage of a human body is 50V, and the voltage grades 48, 36, 24 and 12V of the national standard are generally preferred due to the requirements of the safety performance of the electric equipment. The motor power of the electric automobile equipment is generally tens of kilowatts, and if a single three-phase motor is adopted, the rated current of each phase is hundreds of amperes, and the starting current and the current in the ascending slope are larger and can exceed one kiloamp.
As shown in fig. 2, since the operating current of the motor is large, the output current of the large-capacity serial-parallel battery pack is correspondingly large, typically several tens to several kiloamperes. The connection line between the series-parallel battery pack and the inverter, the joint of the connection line and the battery pack, and the joint of the connection line and the inverter all cause serious heat generation due to the high current flowing. This places high demands on the resistance and insulation properties of the connection line, the contact resistance of the joint fastener and the insulation protection. This therefore also increases the production costs, reducing the reliability and safety of the system.
The overall performance of a high capacity series-parallel battery is not enhanced by the linear superposition of the capacities and numbers of battery cells. After the battery cells are grouped, the energy density, power, performance, durability and safety of the battery pack are reduced to a certain extent. The generation of the situation is that the parameters such as the internal resistance, the voltage and the capacity of the battery are inconsistent because the battery is influenced by factors such as the manufacturing process, the battery aging and the ambient temperature in the process of producing and using the battery. The phenomenon that the performance parameters of the batteries of the same specification and model are different under the same operation environment is called battery inconsistency. For a battery system, inconsistency exists objectively, and during the charge and discharge cycle of a battery, the charge and discharge depths of battery cells are different, so that the performance of the battery often depends on the cell with the worst performance, and the residual capacity of the battery cannot be fully exerted. This also results in overcharge or overdischarge of a part of the battery cells, aggravates deterioration of the performance of the entire battery pack, and may cause safety accidents such as explosion or combustion of the battery in severe cases.
In the battery pack, the voltage inconsistency of the battery cells can have a great influence on the battery pack, and the capacity, performance, service life, safety and other aspects of the battery pack are influenced. Particularly, after a plurality of batteries with inconsistent voltages are connected in parallel to form a battery pack, the battery with high voltage is easy to charge to the battery with low voltage, internal circulation of the battery pack is formed, the electric quantity of the battery pack is wasted meaninglessly, and the charge and discharge efficiency of the battery is finally affected.
The problem of cell equalization in parallel with the cells plays a decisive role in the performance of the battery pack and directly affects the overall performance of the electric device. The current imbalance of the parallel battery pack is influenced by various factors including battery capacity, open circuit voltage, internal resistance, initiation, polarization and the like, and the factors comprehensively act, so that the parallel problem becomes extremely complex. When the consistency of the batteries is good, the capacity retention rate of the battery pack is not greatly influenced by the parallel connection mode, but when short-plate batteries appear in the battery pack or unmatched batteries are connected in parallel, the problem of inconsistent parameters leads to unbalanced current, and the unbalanced current can further lead to inconsistent use conditions, so that the cycle performance of the battery pack is poor. In particular, an increase in the number of parallel cells exacerbates the effects of the short-plate cells. Unexpected end-of-life of a cell in a battery often results in overall functional failure.
In the use process of the battery, a method for carrying out real-time on-line monitoring, analysis and judgment and attempting to eliminate or control the inconsistency of the battery by adopting a battery management system is called a battery balancing technology. However, the battery management system does not have parallel management capability, and it is difficult to manage the energy flows of the individual cells between the parallel connection. The more the number of parallel batteries increases, the greater the difficulty of management.
The problem of battery equalization in battery packs of the core components of electrical equipment has thus severely affected the endurance and performance of high-power electrical equipment, and thus the development of electrical vehicles, electrical boats, electrical aircraft, and even electrical combat vehicles, electrical warships, electrical aircraft, and electrically driven aircraft carriers in national defense.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems, and provides an electric drive device and an electric apparatus.
< Structure one >
The invention provides an electric driving device, which is arranged in electric equipment and used for driving the electric equipment, and comprises: a multiphase ac motor having a number of phases k and having a nominal line voltage and a nominal line current; a DC power supply having a constant voltage corresponding to a rated line voltage of the multi-phase AC motor for supplying a DC power corresponding to a rated line current; a command transmitting unit that transmits a command signal corresponding to a value of a rotational speed or a torque output from the multiphase ac motor; a current sensor for detecting line currents of a multi-phase winding unit constituting the multi-phase alternating current motor and transmitting a feedback signal corresponding to the detected line current value; the output sensor detects the rotating speed or torque output by the multiphase alternating current motor and sends a corresponding output signal; the controller calculates an output control signal according to the instruction signal, the feedback signal and the output signal; a driver generating a driving signal according to the control signal; an inverter for converting a direct current into an alternating current by a driving signal and supplying the alternating current to a multi-phase alternating current motor, the inverter having the following characteristics: the multi-phase alternating current motor is provided with j mutually independent multi-phase winding units with the same parameters, the inverter is provided with j mutually independent inversion units with the same parameters, the j mutually independent inversion units are connected with the j multi-phase winding units in a one-to-one correspondence mode, each inversion unit is provided with k inversion bridge arms which are mutually connected in parallel and have the same parameters, k route currents are provided for the corresponding multi-phase winding units, the direct current power supply is provided with j mutually independent battery units with the same parameters, the j inversion units are respectively and correspondingly connected, the driver is provided with j mutually independent driving units with the same parameters, the j driving units are respectively connected with the j inversion units, k is a positive integer greater than 2, and j is a positive integer greater than 1.
The electric driving device provided by the invention can also have the following technical characteristics: wherein, when the maximum current effective value normally output by a single bridge arm of the inversion unit is I 1 The maximum line current effective value of the multiphase alternating current motor is I N When the number j of the multiphase winding units satisfies the following condition: j > I N ÷ I 1 Wherein j is a positive integer greater than 1.
The electric drive device provided by the invention can also have the following characteristics: the battery unit is formed by connecting one battery unit or at least two battery units in series.
The electric drive device provided by the invention can also have the following characteristics: the multi-phase alternating current motor is an asynchronous motor or a synchronous motor, the multi-phase winding units are symmetrically distributed on the armature, the connection mode of the multi-phase winding units can be star connection or polygonal ring connection, and the product of the number of parallel windings and the number of pole pairs of the multi-phase alternating current motor winding can be divided by the number j of the multi-phase winding units.
The electric drive device provided by the invention can also have the following characteristics: each inverter bridge arm comprises an upper bridge arm power switch unit and a lower bridge arm power switch unit which are connected in series, wherein the upper bridge arm power switch unit and the lower bridge arm power switch unit are respectively formed by connecting a power switch tube or a plurality of power switch tubes with consistent performance parameters in parallel.
The electric drive device provided by the invention can also have the following characteristics: the inverter unit is formed by a single intelligent Power module or a plurality of Power switches Guan Guanzu with the same type and parameter, and the Power switch tube is any one of a Power field effect transistor (Power MOSFET), a gate turn-off thyristor (GTO), an Integrated Gate Commutated Thyristor (IGCT), an Insulated Gate Bipolar Transistor (IGBT), a Power bipolar transistor (GTR) and a gate commutated thyristor (SGCT).
< Structure two >
The invention further provides electric equipment comprising the electric driving device.
According to the electric driving device and the electric equipment provided by the invention, as the multiphase alternating current motor is provided with j mutually independent multiphase winding units with the same parameters, the inverter is provided with j mutually independent inverting units which are connected with the j multiphase winding units in a one-to-one correspondence manner, each inverting unit is provided with k mutually parallel inverting bridge arms which are connected with the same parameters and provide k route currents for the corresponding multiphase winding units, the direct current power supply is provided with j mutually independent battery units with the same parameters, the j mutually independent battery units are respectively connected with the j inverting units correspondingly, and the driver is provided with j mutually independent driving units with the j mutually independent driving units which are respectively connected with the j inverting units, so that the battery units of the battery pack do not adopt a parallel connection technology, and only adopt a serial connection technology to form the battery units, thereby eliminating the battery equalization problem generated after the battery units are connected in parallel. In the aspect of power supply, a plurality of relatively small-capacity battery units replace a single large-capacity serial-parallel battery pack, and under the condition that the number of the battery units is the same, the overall performance attenuation of the batteries caused by parallel connection is reduced, the energy density, the power, the performance, the durability and the safety are improved, and better guarantee can be provided for the cruising and the performance of electric equipment.
In addition, the output current of the battery cells is smaller than the output current of the series-parallel battery pack, so that the connection lines between the battery cells and the inverter cells, the joints of the connection lines and the battery cells, and the joints of the connection lines and the inverter cells have lower requirements on resistance and insulation. Therefore, the production difficulty and the production cost are reduced, and the reliability and the safety of the system are improved.
Moreover, the implementation of the electric driving device is beneficial to breaking monopoly and blockage of the large-current driving device in foreign countries and promoting development and enlargement of electric equipment, so that the electric driving device can replace a fuel engine with large pollution, low starting speed and low energy utilization rate to be applied to heavy locomotives which cannot adopt motors at present, such as heavy locomotives of forklifts, trucks, bulldozers, shovels and the like, and can also be applied to electric combat vehicles, electric aircrafts, electric warships and electric driven aircraft carriers which need larger current in military, and the localization of the low-voltage large-current electric driving device is realized. Compared with a fuel driving device, the system has more excellent performance, higher reliability and stronger fault tolerance.
Therefore, the electric driving device has the advantages of simple and reasonable structural design, low cost, small heating value, stable working performance, safety, reliability, long service life and the like.
Drawings
Fig. 1 is a schematic circuit diagram of an electric driving device according to an embodiment of the invention; and
fig. 2 is a schematic circuit diagram of a high-current multiphase ac motor, an inverter, and a series-parallel battery pack according to the prior art.
Description of the embodiments
Specific embodiments of the present invention are described below with reference to the accompanying drawings.
The electric driving device 10 is provided in an electric apparatus such as an electric tool, a four-axis aircraft, an electric automobile, an electric ship, an industrial electric forklift, an electric military apparatus, for driving the electric apparatus.
Fig. 1 is a schematic circuit diagram of an electric drive apparatus in the present embodiment.
As shown in fig. 1, the electric drive apparatus 10 includes a multiphase ac motor 11, a dc power supply 12, a command transmitting unit 13, a current sensor 14, an output sensor 15, a controller 16, a driver 17, and an inverter 18.
The multiphase ac motor 11 has a phase number k and has a rated line voltage and a rated line current. The multiphase ac motor 11 has j mutually independent and identical multiphase winding units 111, j mounted on one or more armatures, the number of j being equal to or greater than 2, which can be divided equally by the product of the number of parallel windings and the number of pole pairs of the windings of the multiphase ac motor 11. Before and after splitting, the winding phase numbers, winding phase sequences, winding turns, winding connection modes, rated voltage and rated current sum of the windings of the multiphase alternating current motor and j multiphase winding units are kept unchanged.
In the present embodiment, k is three, that is, the multiphase ac motor 11 is a three-phase ac motor, and correspondingly, the multiphase winding unit 111 is a three-phase winding, each of which has three windings A, B, C connected in a delta shape.
In this embodiment, the armature is a stator or a rotor of a multiphase ac motor, which is an asynchronous motor or a synchronous motor.
The dc power supply 12 has a constant voltage corresponding to the rated line voltage of the multiphase ac motor 11 for supplying a dc power corresponding to the rated line current. In this embodiment, the dc power source is a power battery. The dc power supply 12 has j battery cells 121 that are independent of each other and have the same parameters.
Each of the battery cells 121 is composed of one battery cell or is composed of at least two battery cells connected in series. Therefore, the j battery units 121 have no electric coupling relation in the device, the problems of circulation and the like caused by unequal voltages of the battery units are avoided, the battery balancing problem caused by parallel connection of the battery units is eliminated, and the total capacity of the direct current power supply is basically equal to the sum of the capacities of the j battery units 121.
The command transmitting unit 13 transmits a command signal corresponding to the value of the rotational speed or torque output from the multiphase ac motor 11.
The current sensor 14 detects a line current of the multi-phase winding unit 111 and transmits a feedback signal corresponding to the detected line current value. The feedback signal is received by the controller 16.
The output sensor 15 detects the rotational speed or torque output from the multiphase ac motor 11 and transmits a corresponding output signal. The corresponding output signal is received by the controller 16. The output sensor 15 may be a rotational speed sensor or a torque sensor. In the present embodiment, the output sensor 15 is a rotation speed sensor.
The controller 16 calculates an output control signal from the command signal of the command transmitting unit 13, the feedback signal of the current sensor 14, and the output signal of the output sensor 15.
The driver 17 generates a driving signal for driving the inverter to operate according to the control signal.
The inverter 18 converts the direct current into alternating current by the drive signal and supplies the alternating current to the multiphase alternating current motor 11. The inverter 18 includes j inverter units 181 corresponding to the j multiphase winding units 111, respectively.
Each inverter unit 181 has three a-phase inverter legs, B-phase inverter legs and C-phase inverter legs which are connected in parallel and have the same structure as the power switching tubes. The output line of the A phase inversion bridge arm is connected with the junction of the A phase winding and the C phase winding, the output line of the B phase inversion bridge arm is connected with the junction of the B phase winding and the A phase winding, the output line of the C phase inversion bridge arm is connected with the junction of the C phase winding and the B phase winding, and line currents are respectively provided for the windings.
Each inverter leg has an upper leg power switch unit 141a and a lower leg power switch unit 141b connected in series with each other.
The upper bridge arm power switch unit 141a and the lower bridge arm power switch unit 141b are each formed by one power switch tube or a plurality of power switch tubes with consistent performance parameters connected in parallel. In the present embodiment, each three-phase winding 111 is individually driven by an inverter unit 181 composed of six power switching transistors.
The upper arm power switching unit 141a and the lower arm power switching unit 141b have the same maximum continuous operation current. Only below the maximum continuous operating current, a stable operation of the power switching tube is possible for a long period of time, if the operating current exceeds this value, the power switching tube is broken down and damaged by the overcurrent.
In this embodiment, the inverter unit may be formed by a single intelligent power module, or may be formed by combining a plurality of power switches having the same type and parameters.
The Power switch tube is any one of a Power field effect transistor (Power MOSFET), a gate turn-off thyristor (GTO), an Integrated Gate Commutated Thyristor (IGCT), an Insulated Gate Bipolar Transistor (IGBT), a Power bipolar transistor (GTR) and a gate commutated thyristor (SGCT).
In the present embodiment, j mutually independent battery units 121 are respectively connected with j mutually independent inverter units 181 with the same parameters and supply power to j mutually independent multiphase winding units 111 with the same parameters.
The controller 16 also provides signals to the driver 17 according to a predetermined duty cycle between the upper leg power switch unit 141a and the lower leg power switch unit 141b, and according to pulse signals corresponding to on-currents of the upper leg power switch unit 141a and the lower leg power switch unit 141b during the respective duty times.
The driver 17 has j driving units 171 with the same independent parameters, each driving unit 171 receives the same signal sent by the controller 16 at the same time, and the j driving units 171 are respectively connected with the j inverter units 181. Each driving unit 171 may send out an a-phase driving signal, a B-phase driving signal, and a C-phase driving signal, and the three-phase driving signals drive the upper arm power switch unit 141a and the lower arm power switch unit 141B on the a-phase inverter arm, the B-phase inverter arm, and the C-phase inverter arm, respectively, so as to be turned on or turned off.
The number j of the multiphase winding units in the embodiment is an integer, and the following conditions are satisfied: j > I N ÷ I 1 . In the formula I 1 The maximum continuous working current value which can be normally output by a single bridge arm under various different working conditions is obtained; i N Is the maximum effective value of the line current of the multiphase alternating current motor under various different working conditions.
The determination idea of j is as follows: firstly, selecting a proper power switch tube according to the factors of purchase requirements, cost performance, reliability and the like, determining the maximum continuous working current value which can be normally output by a single power switch tube under various different working conditions, and then calculating and rounding up according to the above formula to obtain j.
The number of j can be equally split by the product of the number of the parallel windings and the number of the pole pairs of the winding wires of the multiphase alternating current motor, if the winding wires of the motor are not parallel windings or are difficult to split into the required number, the winding can be redesigned by utilizing the equivalent principle, the product of the number of the parallel windings and the number of the pole pairs of the winding is determined to be an integer multiple of j or j, and then the average split is carried out.
Of course, it is not necessary to rely on I 1 J is determined, but j is directly set, and then a proper switching tube and a split winding wire are selected, so long as the performance of the motor is unchanged after the wire is split, and a single bridge arm can stably provide the line current of the multiphase winding unit.
For the inverter, the output current of any inverter bridge arm is only related to the multiphase winding units connected with the inverter bridge arm, and other multiphase winding units and the output currents of the inverter bridge arms corresponding to the multiphase winding units are not connected with each other in any electric coupling mode. Therefore, the parallel current sharing problem of the power switch tubes in the low-voltage high-current system is eliminated. Even if the switching characteristics of the switching tubes of all the inverter bridge arms of a certain phase are inconsistent, the moment generated by each multiphase winding unit is inconsistent in two moments of the on process and the off process, the time of the on process and the off process of the switching tubes is very short, the switching tubes are generally nanosecond, the motor and the load thereof are relatively large inertial objects, and the influence of the inconsistent moment is very little and can be completely ignored.
According to the electric driving device and the electric equipment provided by the embodiment, as the multiphase alternating current motor is provided with j mutually independent multiphase winding units with the same parameters, the inverter is provided with j mutually independent inverting units which are connected with the j multiphase winding units in a one-to-one correspondence manner, each inverting unit is provided with k mutually parallel inverting bridge arms which are connected with the same parameters and provide k route currents for the corresponding multiphase winding units, the direct current power supply is provided with j mutually independent battery units with the same parameters and is respectively connected with the j inverting units in a corresponding manner, and the driver is provided with j mutually independent driving units with the same parameters and is respectively connected with the j inverting units, so that the battery units of the battery pack do not need to adopt a parallel connection technology, and the battery balancing problem generated after the battery units are connected in parallel can be eliminated by adopting a serial connection technology to form the battery units. In the aspect of power supply, a plurality of relatively small-capacity battery units replace a single large-capacity serial-parallel battery pack, and under the condition that the number of the battery units is the same, the overall performance attenuation of the batteries caused by parallel connection is reduced, the energy density, the power, the performance, the durability and the safety are improved, and better guarantee can be provided for the cruising and the performance of electric equipment.
In addition, the output current of the battery cells is smaller than the output current of the series-parallel battery pack, so that the connection lines between the battery cells and the inverter cells, the joints of the connection lines and the battery cells, and the joints of the connection lines and the inverter cells have lower requirements on resistance and insulation. Therefore, the production difficulty and the production cost are reduced, and the reliability and the safety of the system are improved.
Moreover, the implementation of the electric driving device of the embodiment is beneficial to breaking monopoly and blockage of the large-current driving device in foreign countries and promoting development and enlargement of electric equipment, so that the electric driving device can replace a fuel engine with large pollution, low starting speed and low energy utilization rate to be applied to heavy locomotives which cannot adopt motors at present, such as heavy locomotives of forklifts, trucks, bulldozers, shovels and the like, and can be applied to electric combat vehicles, electric aircrafts, electric warships and electric driven aircraft carriers which need larger current in military, and the localization of the electric driving device with low voltage and large current is realized. Compared with a fuel driving device, the system has more excellent performance, higher reliability and stronger fault tolerance.
In summary, the electric driving device of the embodiment has the advantages of simple and reasonable structural design, low cost, small heating value, stable working performance, safety, reliability, long service life and the like. .
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (6)
1. An electric driving apparatus provided in an electric device for driving the electric device, comprising:
a multiphase ac motor having a number of phases k and having a nominal line voltage and a nominal line current;
a direct current power supply having a constant voltage corresponding to the rated line voltage of the multiphase alternating current motor for supplying a direct current corresponding to the rated line current;
a command transmitting unit configured to transmit a command signal corresponding to a value of a rotational speed or a torque output from the multiphase ac motor;
a current sensor for detecting a line current of a multi-phase winding unit constituting the multi-phase ac motor and transmitting a feedback signal corresponding to the detected line current value;
the output sensor detects the rotating speed or torque output by the multi-phase alternating current motor and sends a corresponding output signal;
a controller that calculates an output control signal based on the command signal, the feedback signal, and the output signal;
a driver for generating a driving signal according to the control signal;
an inverter for converting the direct current into alternating current under the action of the driving signal and providing the alternating current to the multiphase alternating current motor,
the method is characterized in that:
wherein the multiphase alternating current motor is provided with j mutually independent multiphase winding units with the same parameters,
the windings in the same phase in all the multiphase winding units are in parallel winding relationship, the phase numbers, the phase sequences and the connection modes of all the multiphase winding units are the same,
the inverter is provided with j mutually independent inverter units with the same parameters, wherein the j inverter units are connected with the j multiphase winding units in a one-to-one correspondence manner,
each inverter unit is provided with k inverter bridge arms which are connected in parallel and have the same parameters and provide k route currents for the corresponding multiphase winding units,
the direct current power supply is provided with j mutually independent battery units with the same parameters, which are respectively and correspondingly connected with j inversion units, wherein the battery unit is formed by one battery unit or at least two battery units connected in series so as to eliminate the battery equalization problem generated after the battery units are connected in parallel,
the driver is provided with j mutually independent driving units with the same parameters, which are respectively connected with j inversion units,
and k is a positive integer greater than 2, and j is a positive integer greater than 1.
2. The electric drive apparatus according to claim 1, wherein:
wherein, when the maximum continuous working current effective value of the normal output of a single bridge arm of the inversion unit is I 1 The maximum line current effective value of the multiphase alternating current motor is I N When the number j of the multiphase winding units meets the following conditions:
j ＞ I N ÷ I 1 ，
wherein j is a positive integer greater than 1.
3. The electric drive apparatus according to claim 1, wherein:
wherein the multiphase alternating current motor is an asynchronous motor or a synchronous motor,
the multiphase winding cells are symmetrically distributed over the armature,
the multi-phase winding units are connected in a star-shaped connection or a polygonal annular connection,
the product of the number of parallel windings and the number of pole pairs of the multiphase alternating current motor winding can be divided by the number j of multiphase winding units.
4. The electric drive apparatus according to claim 1, wherein:
wherein each inverter bridge arm comprises an upper bridge arm power switch unit and a lower bridge arm power switch unit which are connected in series,
the upper bridge arm power switch unit and the lower bridge arm power switch unit are respectively formed by connecting a power switch tube or a plurality of power switch tubes with consistent performance parameters in parallel.
5. The electric drive apparatus according to claim 1, wherein:
wherein the inversion unit is composed of a single intelligent power module or a plurality of power switches Guan Guanzu with the same type and parameter,
the Power switch tube is any one of a Power field effect transistor (Power MOSFET), a gate turn-off thyristor (GTO), an Integrated Gate Commutated Thyristor (IGCT), an Insulated Gate Bipolar Transistor (IGBT), a Power bipolar transistor (GTR) and a gate commutated thyristor (SGCT).
6. An electrically powered device, comprising:
the electric drive device according to any one of claims 1 to 5.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710068398.6A CN106788117B (en) | 2017-02-08 | 2017-02-08 | Electric drive device and electric apparatus |
| PCT/CN2017/115332 WO2018108040A1 (en) | 2016-12-15 | 2017-12-08 | Electric driving device, electric equipment, inverter and multiphase alternating current motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710068398.6A CN106788117B (en) | 2017-02-08 | 2017-02-08 | Electric drive device and electric apparatus |
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| CN106788117A CN106788117A (en) | 2017-05-31 |
| CN106788117B true CN106788117B (en) | 2023-08-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0105235A2 (en) * | 1982-09-30 | 1984-04-11 | Delta International Machinery Corp. | Electronic AC induction motor brake |
| CN101667804A (en) * | 2009-09-28 | 2010-03-10 | 南京航空航天大学 | Multiphase permanent magnet fault-tolerant motor control system in half-bridge structure |
| CN103441553A (en) * | 2013-09-11 | 2013-12-11 | 山东省科学院自动化研究所 | Electric car modularization power system based on parallel connection of batteries and control method |
| CN105680762A (en) * | 2014-12-04 | 2016-06-15 | 株式会社电装 | Electronic Apparatus |
| CN206542353U (en) * | 2017-02-08 | 2017-10-03 | 上海理工大学 | Vidacare corp and electrical equipment |
-
2017
- 2017-02-08 CN CN201710068398.6A patent/CN106788117B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0105235A2 (en) * | 1982-09-30 | 1984-04-11 | Delta International Machinery Corp. | Electronic AC induction motor brake |
| CN101667804A (en) * | 2009-09-28 | 2010-03-10 | 南京航空航天大学 | Multiphase permanent magnet fault-tolerant motor control system in half-bridge structure |
| CN103441553A (en) * | 2013-09-11 | 2013-12-11 | 山东省科学院自动化研究所 | Electric car modularization power system based on parallel connection of batteries and control method |
| CN105680762A (en) * | 2014-12-04 | 2016-06-15 | 株式会社电装 | Electronic Apparatus |
| CN206542353U (en) * | 2017-02-08 | 2017-10-03 | 上海理工大学 | Vidacare corp and electrical equipment |
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| CN106788117A (en) | 2017-05-31 |
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