CN107070322B - Electric drive device and electric apparatus - Google Patents
Electric drive device and electric apparatus Download PDFInfo
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- CN107070322B CN107070322B CN201710256691.5A CN201710256691A CN107070322B CN 107070322 B CN107070322 B CN 107070322B CN 201710256691 A CN201710256691 A CN 201710256691A CN 107070322 B CN107070322 B CN 107070322B
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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
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
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Abstract
The invention provides an electric drive device and an electric apparatus. The present invention provides a direct current electric driving device, which is arranged in an electric device and used for driving the electric device, and comprises: a DC motor; direct current a power supply; an instruction transmitting unit; output transmission a sensor; a current sensor; a controller; a driver; chopper, having the following characteristics: the direct current motor is provided with 2j armature winding branches which are independent from each other and are formed by m windings, 2j multiplied by m commutating segments which are connected with the windings, 2j independent electric brushes which are connected with the chopper and are in contact with the commutating segments, the driver is provided with 2j independent driving units, the chopper is provided with 2j independent bridge arm units, each driving unit is respectively connected with one bridge arm unit, each bridge arm unit is respectively connected with one electric brush, and j and m are positive integers which are not less than 2.
Description
Technical Field
The invention belongs to the field of direct 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 utilizing the electric energy provided by 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 AC motor, especially the asynchronous motor, has the advantages of simple structure, reliable operation, light weight and low cost, so that it has been widely used. However, the method has the defects of small starting torque, large starting current, poor speed regulation smoothness, large vibration and noise, complex control algorithm and the like. Even if the best control algorithm is adopted, the existence of higher harmonics in the motor still cannot be stopped, so that the performance of the alternating current motor is inferior to that of the direct current motor in the processes of starting, braking, speed regulation and low speed. Therefore, in the case where the performance requirements of the electric devices are high, such as a household variable frequency air conditioner, a lift passenger elevator, an electric car, etc., electric devices equipped with a dc motor are still favored.
In the existing direct current electric driving device, the requirements on the power switching tube are very strict, and in normal operation, the power switching tube must work at the maximum working temperature, the maximum working current and the maximum working voltage, and once any condition is exceeded, the power switching tube is damaged; in addition, when the variation of component parameters in the electronic circuit exceeds the normal working range, overvoltage or overcurrent can be generated in the power switch tube, so that the power switch tube is damaged and the electric equipment is damaged; in addition, as the working time increases, the power switch tube is aged, the performance indexes such as the maximum working temperature, the maximum working current and the maximum working voltage are reduced, and faults such as overall failure or short circuit of the chopper and the like are easily caused by the damage of the power switch tube, so that the faults of electric equipment and even safety accidents are further caused.
High-power electric drives and electric devices, particularly low-voltage high-current electric drives and electric devices, require controllers or choppers that continuously operate at very high currents, and related techniques and products are controlled and monopolized by individual countries and companies, resulting in very high prices, and current values output by commercially available high-performance motor controllers or choppers are only under one kiloamp. Based on the bottom, the low-voltage high-current electric driving device and the development of the electric equipment are severely restricted and influenced by various reasons such as manufacturing level, parallel current sharing technology of a plurality of power switch tubes, excessively complex control circuits and algorithms and the like.
In summary, these problems have severely affected the development of high performance high power electrical equipment, including low voltage high current electrical vehicles, electrical boats, even in defense electrical combat vehicles, electrical warships, electrical aircraft, and electrically driven aircraft carriers.
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 a direct current electric driving device, which is arranged in electric equipment and used for driving the electric equipment, and comprises the following components: a DC motor having a rated voltage and a rated current; a direct current power supply having a constant voltage corresponding to a rated voltage for supplying a direct current corresponding to a rated current; a command transmitting unit that transmits a command signal corresponding to a value of a rotational speed or a torque output from the direct current motor; an output sensor for detecting the rotational speed or torque output by the DC motor, and transmitting a corresponding output feedback signal; the current sensor detects the current value of the outgoing line of the direct-current power supply and sends a corresponding current feedback signal; the controller calculates and outputs an operation control signal and a motor control signal according to the command signal, the current feedback signal and the output feedback signal; the driver enters a working state or a stopping state under the action of the operation control signal, and generates a driving signal according to the motor control signal in the working state; the chopper converts direct current into direct current with controllable voltage under the action of a driving signal and provides the direct current with the direct current motor, and has the following characteristics: the direct current motor is provided with 2j armature winding branches which are independent from each other and are formed by m windings, 2j multiplied by m commutating segments which are connected with the windings, 2j independent electric brushes which are connected with the chopper and are in contact with the commutating segments, the driver is provided with 2j independent driving units, the chopper is provided with 2j independent bridge arm units, each driving unit is respectively connected with one bridge arm unit, each bridge arm unit is respectively connected with one electric brush, and j and m are positive integers which are not less than 2.
In the dc motor drive device according to the present invention, the following features may be provided: the chopper is a bridge type chopper, 2j mutually independent electric brushes are evenly divided into two groups of electric brush groups according to the polarity of a main magnetic pole of a corresponding direct current motor, the chopper is provided with 2 bridge arm parts corresponding to the two groups of electric brush groups respectively, each bridge arm part comprises bridge arm units corresponding to the j electric brushes one by one, each bridge arm unit comprises a chopping bridge arm and a freewheel diode connected with the chopping bridge arm in an anti-parallel mode, linear current is provided for the corresponding electric brush, the chopping bridge arm comprises two power switching tubes connected in series, each power switching tube is connected with one freewheel diode in an anti-parallel mode, and j is a positive integer not smaller than 2.
In the dc motor drive device according to the present invention, the following features may be provided: wherein, when the rated current of the electric brush outgoing line is I 1 The rated current of the direct current motor is I N When the number 2j of armature winding branches satisfies the following condition:
j＞I N ÷I 1 ，
j is a positive integer not less than 2.
In the dc motor drive device according to the present invention, the following features may be provided: the connection mode of the armature windings is lap winding, and the excitation mode of the main magnetic pole of the direct current motor is permanent magnet, separate excitation, series excitation, shunt excitation or compound excitation.
In the dc motor drive device according to the present invention, the following features may be provided: the direct current power supply is a rectifying source obtained by rectifying and filtering a battery pack or an alternating current power supply, and the battery pack is composed of at least one battery cell.
In the dc motor drive device according to the present invention, the following features may be provided: the chopper is composed of at least one intelligent power module or comprises a plurality of power switching tubes, wherein the power switching tubes are any one of an electric field effect transistor, a gate turn-off thyristor, an integrated gate commutating thyristor, an insulated gate bipolar transistor, an electric bipolar transistor and a gate commutating thyristor.
< Structure two >
The invention further provides electric equipment comprising the electric driving device.
Effects and effects of the invention
According to the electric driving device and the electric equipment provided by the invention, the driver comprises 2j driving units which are mutually independent and have the same parameters, the direct current motor is provided with 2j armature winding branches which are mutually independent and are formed by m windings, 2j multiplied by m commutating pieces which are connected with the windings, and 2 groups of electric brush groups which are respectively positioned at two sides of the armature winding branches and are in contact with the commutating pieces, each electric brush group comprises j mutually independent electric brushes, the chopper is provided with 2 bridge arm parts which are respectively corresponding to the 2 groups of electric brush groups, each bridge arm part comprises j bridge arm units which are respectively corresponding to the j electric brushes of the corresponding electric brush groups, therefore, the line currents output by any two bridge arm units of each bridge arm part are mutually independent and mutually noninterfere, and the output current of the chopper can be linearly increased by increasing the number of the bridge arm units, and can reach infinity theoretically. The method not only reserves the maturation control algorithm of the original chopper and the maturation technology of the direct current motor, but also reduces the requirement on the performance consistency of the power switch tube, can meet the requirement of large current by using the common power switch tube, and avoids the great labor and financial consumption caused by finely selecting switching elements with high consistency from a great number of power switch tubes.
When any one of the driving units, the bridge arm units, the brushes or the armature winding branches generates faults, the electric driving fault-tolerant device and the electric equipment are used for calculating the current value detected by the current sensor and judging the driving unit, the bridge arm unit, the brushes or the armature winding branches which generate faults, and then the controller outputs the driving unit corresponding to the operation control signal to stop working, so that the damaged driving unit, the bridge arm unit, the brushes or the armature winding branches are shielded and isolated, the fault is prevented from being further expanded, the normal working or the light load operation of the electric driving device and the electric equipment can be continued, and the probability of the occurrence of safety accidents of the electric equipment, particularly the electric equipment which operates at high speed is greatly reduced.
In addition, the electric driving device disclosed by the invention can break monopoly and blockage of a large-current driving device in foreign countries, so that the direct-current 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 currently adopt motors, such as heavy locomotives of trucks, bulldozers, shovels and the like, and can be applied to electric combat vehicles, electric warships and electrically-driven aircraft carriers which need larger current in military, and the localization of the low-voltage large-current electric driving device is realized. And compared with an alternating current motor driving device, the system performance is more superior.
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 electric driving device in the prior art.
Detailed Description
In order to make the technical means, creation features, achievement of the purposes and effects of the present invention easy to understand, the following embodiments specifically describe the dc electric driving device and the electric apparatus of the present invention with reference to the accompanying drawings.
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 a dc motor driving device in the present embodiment.
As shown in fig. 1, the electric drive apparatus 10 includes a dc motor 11, a dc power supply 12, a command transmitting unit 13, an output sensor 14, a current sensor 15, a controller 16, a driver 19, and a chopper 20.
The dc motor 11 has a rated voltage and a rated current. The direct current motor 11 has a main pole 111 and at least one armature 112. In an embodiment, the DC motor has an armature 112. The armature 112 is a rotor of a direct current motor.
The main pole 111 provides an operating magnetic field for the armature 112. The excitation mode of the main magnetic pole is permanent magnet, separate excitation, series excitation, shunt excitation or compound excitation. If the main magnetic pole is in a separate excitation mode, the separate excitation winding is controlled independently of the armature winding. If the main pole is shunt excited, the shunt excitation windings are supplied by a separate bridge reversible chopper and a dc power supply of the same voltage as the dc power supply 12 and a separate drive unit 191. In the present embodiment, the main pole 111 adopts a series excitation method.
The armature 112 includes a rotor core (not shown), 2j armature winding legs 1121, 2j×m segments (not shown), and 2 groups of brushes 1122.
The armature winding branches 1121 are independently mounted on the rotor core of the armature 112. The armature winding branch 1121 is composed of m windings wound around the rotor core, where m is a positive integer of 2 or more. The windings in the armature winding leg 1121 are connected in a lap winding. During normal operation, the currents of all armature winding branches are not affected and are independent.
The 2 groups of brushes 1122 are divided into two groups according to the polarities of the main poles 111 corresponding to the spatial positions thereof, and are respectively connected to the two groups of power lines of the dc motor 11 and are in contact with the commutator segments of the commutator. Each brush group comprises j mutually independent brushes. The 2j electric brushes are uniformly distributed on a commutator of the direct current motor, which is formed by commutating segments, and correspond to the position of a main magnetic pole of the direct current motor, and each electric brush can be at least contacted with one commutating segment. One group of electric brushes is uniformly distributed along the circumferential direction of the motor, and the space position of the other group of electric brushes is arranged between two adjacent electric brushes in different groups. In this embodiment, the brushes are narrow brushes having dimensions slightly smaller than the dimensions of the segments. In this embodiment, each brush may be in contact with at least one segment.
The dc power supply 12 has a constant voltage corresponding to a rated voltage for supplying a dc power corresponding to a rated current. The dc power supply 12 is a battery pack or a dc power supply obtained by rectifying and filtering an ac power supply, and in this embodiment, the dc power supply 12 is a battery pack.
The command transmitting unit 13 transmits a command signal corresponding to the value of the rotational speed or torque output from the dc motor 11.
The output sensor 14 detects the rotational speed or torque output from the dc motor 11 and outputs a corresponding output feedback signal. The output feedback signal is received by the controller 16.
The current sensor 15 detects the connection line current value between the dc power supply 12 and the bridge arm unit 2011, and outputs a corresponding current feedback signal. The current feedback signal is received by the controller 16.
The controller 16 calculates an operation control signal 17 and a motor control signal 18 of the driver based on the command signal of the command transmitting section 13, the output feedback signal of the output sensor 14, and the current feedback signal of the current sensor 15.
The driver 19 is put into operation under the control of the operation control signal 17 and generates a driving signal for driving the chopper 20 to operate in accordance with the motor control signal 18.
The chopper 20 converts the constant voltage direct current into direct current with controllable average voltage under the action of a driving signal from the driver 19 and supplies the direct current to the direct current motor 11. In the present embodiment, the chopper 20 is a bridge chopper.
The chopper 20 has 2 arm portions 201 corresponding to 2 brush groups, respectively. Each bridge arm 201 includes bridge arm units 2011 corresponding to j brushes one by one. Each bridge arm unit 2011 contains one chopper bridge arm 20111 and two flywheel diodes connected in anti-parallel with the chopper bridge arm 20111, and provides line current for the corresponding brushes.
The upper bridge arm power switch tube and the lower bridge arm power switch tube are respectively connected with a freewheel diode in anti-parallel. The upper bridge arm power switch tube and the lower bridge arm power switch tube have the same preset maximum continuous working current, which is an important parameter of the power switch tube, the power switch tube can stably operate only under the current value, and if the working current exceeds the current value, the power switch tube is broken down due to overcurrent, so that the power switch tube is damaged. In view of the influence of various working environments, the rated current of the outgoing line of the brush is generally smaller than the maximum continuous working current and is generally 0.5 to 0.8 times of the maximum continuous working current.
The upper bridge arm power switch tube or the lower bridge arm power switch tube is a full-control power switch tube, and can adopt any one of a power field effect transistor, a gate turn-off thyristor, an integrated gate commutating thyristor, an insulated gate bipolar transistor, a power bipolar transistor and a gate commutating thyristor. In this embodiment, the power switch is a power field effect transistor.
When the rated current of the outgoing line of the brush is I 1 The rated current of the DC motor 11 is I N The number 2j of armature winding branches 1121 satisfies the following condition: j > I N ÷I 1 J is a positive integer not less than 2.
In this embodiment, the predetermined control rule is: in 2j current sensors 15, if one current feedback signal is continuously zero and the other current feedback signals are all non-zero, the controller determines that the corresponding driving unit 191, bridge arm unit 2011, and brush or armature winding branch 1121 are in fault, and the controller 16 outputs an operation control signal 17 to enable the corresponding driving unit 191 to enter a stop state; if one current feedback signal is continuously greater than 1.5 times of the average value of the other current feedback signals, the controller 16 judges that the corresponding bridge arm unit 2011 or armature winding branch 1121 is short-circuit fault, and the controller 16 outputs the operation control signal 17 to enable the corresponding driving unit 191 to enter a stop state, so that the driving unit, the bridge arm unit, the electric brush and the armature winding branch corresponding to the fault are shielded and isolated, and further expansion of the fault is avoided.
Effects and effects of the examples
According to the electric driving device and the electric equipment provided by the embodiment, the driver comprises 2j driving units which are independent and have the same parameters, the direct current motor is provided with 2j armature winding branches which are independent and consist of m windings, 2j multiplied by m commutating pieces which are connected with the windings, 2 groups of electric brushes which are respectively positioned at two sides of the armature winding branches and are in contact with the commutating pieces, each electric brush group comprises j independent electric brushes, the chopper is provided with 2 bridge arm parts which are respectively corresponding to the 2 groups of electric brushes, each bridge arm part comprises j bridge arm units which are respectively corresponding to the j electric brushes of the corresponding electric brush groups, and therefore line currents output by any two bridge arm units of each bridge arm unit are independent and do not interfere with each other, and the output current of the chopper can be linearly increased by increasing the number of the bridge arm units, so that infinity can be achieved theoretically. The method not only reserves the maturation control algorithm of the original chopper and the maturation technology of the direct current motor, but also reduces the requirement on the performance consistency of the power switch tube, can meet the requirement of large current by using the common power switch tube, and avoids the great labor and financial consumption caused by finely selecting switching elements with high consistency from a great number of power switch tubes.
Each driving unit is correspondingly connected with one bridge arm unit, one electric brush and two armature winding branches, when any one driving unit, one bridge arm unit, one electric brush or one armature winding branch generates faults, the electric driving fault-tolerant device and the electric equipment of the embodiment calculate the current value detected by the current sensor and judge the driving unit, the bridge arm unit, the electric brush or the armature winding branch which generate faults, and then the controller outputs the driving unit corresponding to the operation control signal to stop working, so that the damaged driving unit, the bridge arm unit, the electric brush or the armature winding branch is shielded and isolated, the further expansion of faults is avoided, the electric driving device and the electric equipment can continue to work normally or run under light load, and the probability of the occurrence of safety accidents of the electric equipment, particularly the electric equipment which runs at high speed is greatly reduced.
In addition, the electric driving device of the embodiment can break monopoly and blockage of the large-current driving device in foreign countries, so that the direct-current electric driving device can replace a fuel engine with large pollution, low starting speed and low energy utilization rate and can be applied to heavy locomotives which cannot adopt motors at present, such as heavy locomotives of trucks, bulldozers, shovels and the like, and can also be applied to electric combat vehicles, electric warships and electrically-driven aircraft carriers which need larger current in military, and the localization of the low-voltage large-current electric driving device is realized. And compared with an alternating current motor driving device, the system performance is more superior.
Therefore, 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.
In the above embodiment, the brush is a narrow brush, but as the brush of the present invention, a wide brush may be used.
In addition, the direct current power supply is a rectifying source obtained by rectifying and filtering a battery pack or an alternating current power supply, and the direct current power supply is an integral or mutually independent power supply unit which is provided with 2j bridge arm units which are connected in a one-to-one correspondence manner. When the direct current power supply is provided with 2j mutually independent power supply units, the output current of each power supply unit is smaller than the total current of the direct current power supply, and the connecting wire between the power supply unit and the chopper, the connecting piece between the connecting wire and the power supply unit and the connecting piece between the connecting wire and the chopper have lower requirements on contact resistance and insulation, so that the difficulty and the cost of production are reduced, and the reliability and the safety of the system are improved.
When the power supply unit is a battery pack and is provided with 2j mutually independent battery units, the battery units in the battery units can meet the requirements by adopting a serial connection technology without a parallel connection technology, so that the battery equalization problem generated after the plurality of battery units are connected in parallel is solved, and the cost generated for reducing the inconsistency of the plurality of battery units is also avoided. In the aspect of power supply, a plurality of relatively small-capacity serial battery units replace a single large-capacity serial-parallel battery pack, so that the overall performance attenuation of batteries caused by parallel connection is reduced under the condition that the number of battery monomers is the same, 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.
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 (7)
1. A direct current electric drive apparatus provided in an electric device for driving the electric device, comprising:
a DC motor having a rated voltage and a rated current;
a direct current power supply having a constant voltage corresponding to the rated voltage for supplying direct current corresponding to the rated current;
a command transmitting unit that transmits a command signal corresponding to a value of a rotational speed or a torque output from the dc motor;
the output sensor detects the rotating speed or torque output by the direct current motor and sends a corresponding output feedback signal;
the current sensor detects the current value of the outgoing line of the direct-current power supply and sends a corresponding current feedback signal;
a controller for calculating and outputting an operation control signal and a motor control signal according to the command signal, the current feedback signal and the output feedback signal;
the driver enters a working state or a stopping state under the action of the operation control signal, and generates a driving signal according to the motor control signal in the working state;
a chopper for converting the direct current into direct current with controllable voltage under the action of the driving signal and providing the direct current to the direct current motor,
the method is characterized in that:
wherein the DC motor is provided with 2j armature winding branches which are independent from each other and are composed of m windings, 2j multiplied by m commutating segments connected with the windings, 2j mutually independent electric brushes connected with the chopper and contacted with the commutating segments,
the drive has 2j mutually independent drive units,
the chopper has 2j mutually independent bridge arm units,
each driving unit is respectively connected with one bridge arm unit, each bridge arm unit is respectively connected with one electric brush,
and j and m are positive integers not less than 2.
2. The direct current electric drive apparatus according to claim 1, wherein:
wherein the chopper is a bridge type chopper, 2j mutually independent electric brushes are evenly divided into two groups of electric brush groups according to the corresponding polarity of the main magnetic pole of the direct current motor,
the chopper is provided with 2 bridge arm parts corresponding to the two groups of electric brush groups respectively, each bridge arm part comprises the bridge arm units corresponding to the j electric brushes one by one,
each bridge arm unit comprises a chopper bridge arm and a flywheel diode which is connected with the chopper bridge arm in anti-parallel, and provides line current for the corresponding electric brush,
the chopper bridge arm comprises two power switching tubes connected in series, each power switching tube is connected with one free-wheeling diode in anti-parallel,
and j is a positive integer not less than 2.
3. The direct current electric drive apparatus according to claim 1, wherein:
wherein when the rated current of the electric brush outgoing line is I 1 The rated current of the direct current motor is I N When the number 2j of the armature winding branches meets the following conditions:
j＞I N ÷I 1 ，
and j is a positive integer not less than 2.
4. The direct current electric drive apparatus according to claim 1, wherein:
wherein the connection mode of the armature winding is lap winding,
the excitation mode of the main magnetic pole of the direct current motor is permanent magnet, separate excitation, series excitation, shunt excitation or compound excitation.
5. The direct current electric drive apparatus according to claim 1, wherein:
wherein the direct current power supply is a rectifying source obtained by rectifying and filtering a battery pack or an alternating current power supply,
the battery pack is composed of at least one battery cell.
6. The direct current electric drive apparatus according to claim 1, wherein:
wherein the armature winding branch is independently arranged on at least one armature core of the direct current motor,
the chopper is formed by at least one intelligent power module or comprises a plurality of power switching tubes,
the power switch tube is any one of a power field effect transistor, a gate turn-off thyristor, an integrated gate commutating thyristor, an insulated gate bipolar transistor, a power bipolar transistor and a gate commutating thyristor.
7. An electrically powered device, comprising:
the direct current electric drive apparatus according to any one of claims 1 to 6.
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