CN112825446A - Series-parallel excitation direct current motor - Google Patents

Series-parallel excitation direct current motor Download PDF

Info

Publication number
CN112825446A
CN112825446A CN201911139124.7A CN201911139124A CN112825446A CN 112825446 A CN112825446 A CN 112825446A CN 201911139124 A CN201911139124 A CN 201911139124A CN 112825446 A CN112825446 A CN 112825446A
Authority
CN
China
Prior art keywords
series
excitation
shunt
terminals
parallel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201911139124.7A
Other languages
Chinese (zh)
Inventor
李静怡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201911139124.7A priority Critical patent/CN112825446A/en
Publication of CN112825446A publication Critical patent/CN112825446A/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/02—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting
    • H02K23/08—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting having series connection of excitation windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/02—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting
    • H02K23/06—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting having shunt connection of excitation windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc Machiner (AREA)

Abstract

The invention provides a series-parallel excitation direct current motor, which is connected with m pairs of power output terminals formed by at least one direct current power supply and has rated input current, and is characterized by comprising the following components: a housing; m pairs of electric brushes; a stator including m pairs of main poles corresponding to the m pairs of brushes and including a series field winding portion and a shunt field winding portion; and a rotor, wherein the series excitation winding part comprises m series excitation winding units, the shunt excitation winding part comprises m shunt excitation winding units, the m shunt excitation winding units correspond to the m pairs of main poles respectively, each series excitation winding unit is formed by making a series excitation coil on the m pairs of main poles through an insulated conductor strip, each shunt excitation winding unit is formed by making a shunt excitation coil on the corresponding pair of main poles through an insulated conductor strip, and m is a positive integer not less than 2.

Description

Series-parallel excitation direct current motor
Technical Field
The invention belongs to the field of direct current motors, and particularly relates to a series-parallel excitation direct current motor.
Background
The series-parallel excitation direct current motor is a compound excitation direct current motor and comprises 2 sets of excitation windings, namely a series excitation winding and a parallel excitation winding. The armature winding and the series excitation winding of the series-parallel excitation direct current motor are excited in series and then are excited in parallel with the parallel excitation winding. The motor with the magnetic fields generated by the series excitation winding and the parallel excitation winding enhanced in the same direction is an integral compound excitation direct current motor. The product compound excitation motor integrates the advantages of a series excitation direct current motor and a parallel excitation direct current motor, has large starting torque at low speed, runs at high speed under light load, avoids the possibility of galloping, is particularly suitable for the running working condition of the crane, namely heavy-load large-torque starting, can run at low speed under heavy load, and can run at high speed under light load so as to ensure the safety and efficiency of operation. The device has obvious advantages in the driving of large-load vehicles such as electric porters, rail cars, sightseeing vehicles, trucks, ships and the like.
The DC motor is generally used together with a chopper to form a speed regulating device of the DC motor, and in order to ensure the reliability of a system, the maximum output current of the chopper is generally 2 to 3 times of the rated current of the motor. The high-power high-performance direct current motor, especially the low-voltage high-current direct current motor, needs a chopper with large continuous working current, and related technologies and products are controlled and monopolized by individual countries and companies, so that the price is very high, and the output current value of the chopper for the high-performance motor which can be purchased in the market is only below one thousand amperes, which seriously restricts and influences the development of the low-voltage high-current direct current motor.
The chopper adopts the pulse width modulation technology to control the on-off of the power switch tube to change the output voltage and the output current, the size of the output current ripple is inversely proportional to the switching frequency of the power switch tube, and the size of the switching frequency of the power switch tube is directly proportional to the switching loss (or temperature rise and fault rate). And the motor output torque ripple is proportional to the square of the current ripple. Therefore, in order to reduce the motor output torque ripple or reduce the current ripple, it is necessary to increase the switching frequency; in order to reduce the switching losses, the switching frequency must be reduced. This contradiction affects the development of speed regulating device for high power and high performance DC motor. Which makes it difficult to apply to devices such as numerically controlled machine tools, which have high requirements for torque ripple.
Series-parallel excitation direct current motors applied to defense equipment are particularly sensitive to vibration and electromagnetic interference due to stealth requirements, namely the ripple requirements on the output torque of the motor and the ripple requirements on current are particularly strict. At present, the traditional series-parallel excitation direct current motor applied to high-power national defense electric equipment is difficult to deal with the detection technology with the increasingly developed technology.
For the reasons, the development of a high-power series-parallel excitation direct-current motor is restricted and influenced, and economic construction and national defense construction are influenced.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a series-parallel excited dc motor.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a series-parallel excitation direct current motor, which is connected with m pairs of power output terminals formed by at least one direct current power supply and has rated input current, and is characterized by comprising the following components: a housing; m pairs of electric brushes are fixed in the shell and are arranged according to rated input current; a stator disposed in the case, including m pairs of main poles corresponding to the m pairs of brushes and including a series field winding portion and a shunt field winding portion; and a rotor disposed in the stator and including a plurality of armature windings connected to each other by a predetermined connection method, wherein each pair of main poles includes an S-polarity main pole and an N-polarity main pole, the polarities of the adjacent 2 main poles are different, the positions of the 2 brushes in each pair are adjacent, each pair of brushes includes an S-pole corresponding brush corresponding to the S-polarity main pole and an N-pole corresponding brush corresponding to the N-polarity main pole, the series winding portion includes m series winding units, the parallel winding portion includes m parallel winding units, the m parallel winding units correspond to the m pairs of main poles, each series winding unit is formed by forming a series coil on the m pairs of main poles by an insulated conductor bar formed by a wire coated with an insulating layer, and each parallel winding unit is formed by forming an insulated conductor bar on the corresponding pair of main poles by a wire coated with an insulating layer The electrodes are respectively made into shunt excitation coils, an insulated conductor strip in each series excitation winding unit is provided with a series excitation end and a series excitation other end, an insulated conductor strip in each shunt excitation winding unit is provided with a shunt excitation end and a shunt excitation other end, and m series excitation ends of the insulated conductor strips of all the series excitation winding units are electrically connected with m S pole corresponding brushes in all the brushes; or m series excitation ends of the insulated conductor strips of all the series excitation winding units are electrically connected with m N pole corresponding brushes in all the brushes, m series excitation other ends of the insulated conductor strips of all the series excitation winding units form m first terminals, leading-out ends of m brushes which are not connected with m series excitation ends form m second terminals, m first terminals and m second terminals respectively form m pairs of external connecting terminals correspondingly, the m pairs of external connecting terminals are used for being connected with m pairs of power output terminals in a one-to-one correspondence manner, m parallel excitation ends of the insulated conductor strips in all the parallel excitation winding units are connected with m first terminals in a one-to-one correspondence manner, and simultaneously m parallel excitation other ends of the insulated conductor strips in all the parallel excitation winding units are connected with m second terminals in a one-to-one correspondence manner; or the m shunt excitation other ends of the insulated conductor bars in all the shunt excitation winding units are correspondingly connected with the m first wiring ends one by one, meanwhile, the m shunt excitation ends of the insulated conductor bars in all the shunt excitation winding units are correspondingly connected with the m second wiring ends one by one, and m is a positive integer not less than 2.
The invention provides a series-parallel excitation direct current motor, which is connected with m pairs of power output terminals formed by at least one direct current power supply and has rated input current, and is characterized by comprising the following components: a housing; m pairs of electric brushes are fixed in the shell and are arranged according to rated input current; a stator disposed in the case, including m pairs of main poles corresponding to the m pairs of brushes and including a series field winding portion and a shunt field winding portion; and a rotor disposed in the stator and including a plurality of armature windings coupled to each other by a predetermined coupling method, wherein each pair of the brushes includes 2 brushes adjacent to each other, the series winding portion includes m series winding units, the shunt winding portion includes m shunt winding units, the m shunt winding units correspond to the m pairs of main poles, each series winding unit is formed by connecting 2m series coils formed on the m pairs of main poles by an insulated conductor bar formed of a metal wire coated with an insulating layer, each shunt winding unit is formed by connecting 2 shunt coils formed on the corresponding pair of main poles by an insulated conductor bar formed of a metal wire coated with an insulating layer, each shunt winding unit has a series end and a series end divided in a predetermined current direction of the series coil, each pair of main magnetic poles comprises an S-pole main magnetic pole and an N-pole main magnetic pole which correspond to the winding direction of the series exciting coil in the series exciting winding unit and the preset current direction of the series exciting coil, the polarities of the adjacent 2 main magnetic poles are different, each pair of electric brushes comprises an electric brush corresponding to the S-pole main magnetic pole and an electric brush corresponding to the N-pole main magnetic pole, and the m series exciting ends of the insulated conductor bars of all the series exciting winding units are electrically connected with the m S-pole corresponding electric brushes in all the electric brushes; or m series excitation ends of the insulated conductor strips of all the series excitation winding units are electrically connected with m N pole corresponding brushes in all the brushes, m series excitation other ends of the insulated conductor strips of all the series excitation winding units form m first terminals, leading-out ends of m brushes which are not connected with m series excitation ends form m second terminals, m first terminals and m second terminals respectively form m pairs of external connecting terminals correspondingly, the m pairs of external connecting terminals are used for being connected with m pairs of power output terminals in a one-to-one correspondence manner, m parallel excitation ends of the insulated conductor strips in all the parallel excitation winding units are connected with m first terminals in a one-to-one correspondence manner, and simultaneously m parallel excitation other ends of the insulated conductor strips in all the parallel excitation winding units are connected with m second terminals in a one-to-one correspondence manner; or the m shunt excitation other ends of the insulated conductor bars in all the shunt excitation winding units are correspondingly connected with the m first wiring ends one by one, meanwhile, the m shunt excitation ends of the insulated conductor bars in all the shunt excitation winding units are correspondingly connected with the m second wiring ends one by one, and m is a positive integer not less than 2.
The series-parallel excited direct current motor provided by the invention can also have the following characteristics: wherein each brush comprises one brush body or at least two separately shaped brush bodies arranged axially of the machine and electrically connected in parallel.
The series-parallel excited direct current motor provided by the invention can also have the following characteristics: the number of the direct current power supplies is 1, and the m pairs of power supply output terminals are respectively terminals on m power supply output branches of the direct current power supplies.
The series-parallel excited direct current motor provided by the invention can also have the following characteristics: the number of the direct current power supplies is m, and the m pairs of power supply output terminals are wiring terminals of the m direct current power supplies respectively.
The series-parallel excited direct current motor provided by the invention can also have the following characteristics: wherein, the insulated conductor strip is any one of enameled wires and insulated copper conducting bars.
The series-parallel excited direct current motor provided by the invention can also have the following characteristics: the number of turns of the series excitation coil in the series excitation winding unit on each main magnetic pole is the same, the number of turns of the parallel excitation coil in the parallel excitation winding unit on each main magnetic pole is the same, the current surrounding directions of the series excitation coil and the parallel excitation coil on each main magnetic pole are the same, and each pair of main magnetic poles correspond to the spatial positions of the corresponding pair of electric brushes.
The series-parallel excited direct current motor provided by the invention can also have the following characteristics: in each series excitation winding unit, the connection relationship of the 2m series excitation coils is any one of series connection, parallel connection and series-parallel connection, the connection relationship of the 2m series excitation coils in each series excitation winding unit is the same, in each parallel excitation winding unit, the connection relationship of the 2 parallel excitation coils is any one of series connection and parallel connection, and the connection relationship of the 2 parallel excitation coils in each parallel excitation winding unit is the same.
The series-parallel excited direct current motor provided by the invention can also have the following characteristics: wherein the predetermined coupling means is any one of a single stack, a multiple stack and a complex wave.
The series-parallel excited direct current motor provided by the invention can also have the following characteristics: the direct current power supply is any one of a chopper, a battery and a rectification power supply.
Action and Effect of the invention
According to the series-parallel excited dc motor provided by the present invention, since the series excitation winding part includes m series excitation winding units, and the parallel excitation winding part includes m parallel excitation winding units, the m parallel excitation winding units correspond to the m pairs of main poles respectively, each series excitation winding unit is formed by making series excitation coils on the m pairs of main poles through an insulated conductor strip formed by metal wires wrapped with insulating layers respectively, each parallel excitation winding unit is formed by making parallel excitation coils on the corresponding pair of main poles through an insulated conductor strip formed by metal wires wrapped with insulating layers respectively, the insulated conductor strip in each series excitation winding unit is provided with a series excitation end and a series excitation other end, the insulated conductor strip in each parallel excitation winding unit is provided with a parallel excitation end and a parallel excitation other end, and the m series excitation ends of the insulated conductor strips of all the series excitation winding units are electrically connected with the m S pole corresponding electric brushes in all the electric brushes; or m series excitation ends of the insulated conductor strips of all the series excitation winding units are electrically connected with m N pole corresponding brushes in all the brushes, m series excitation other ends of the insulated conductor strips of all the series excitation winding units form m first terminals, leading-out ends of m brushes which are not connected with m series excitation ends form m second terminals, m first terminals and m second terminals respectively form m pairs of external connecting terminals correspondingly, the m pairs of external connecting terminals are used for being connected with m pairs of power output terminals in a one-to-one correspondence manner, m parallel excitation ends of the insulated conductor strips in all the parallel excitation winding units are respectively connected with m first terminals in a one-to-one correspondence manner, and simultaneously m parallel excitation other ends of the insulated conductor strips in all the parallel excitation winding units are respectively connected with m second terminals in a one-to-one correspondence manner; or, m shunt excitation other ends of the insulated conductor bars in all the shunt excitation winding units are respectively connected with m first terminals in a one-to-one correspondence manner, and simultaneously, m shunt excitation ends of the insulated conductor bars in all the shunt excitation winding units are respectively connected with m second terminals in a one-to-one correspondence manner, that is, each pair of external connection terminals are connected with a series excitation winding unit and a pair of brushes which are connected in series at first and a shunt excitation winding unit which is connected in parallel at second, so on one hand, branches formed by each series excitation winding unit and a pair of brushes and shunt excitation winding units which are connected in parallel are mutually independent, the current of each branch is also independent, and each branch can independently work and is independently supplied by a corresponding pair of power output terminals, that is: each pair of power output terminals only bears the working current of one branch circuit and only has one m-th of the rated input current of the motor. For the motor with very large rated input current, as long as m is large enough, the working current of each branch circuit or the output current of each pair of power output terminals can be correspondingly reduced, so that the output current of the power output terminals can be reduced to the value which can meet the requirements of the high-power high-performance motor by using a common power switch tube without adopting a power module or a parallel current sharing technology, the cost of a direct-current power supply is reduced, the requirements of a connecting wire and a connecting piece between an external wiring terminal and the power output terminals on contact resistance and insulation are also reduced, the difficulty of production and manufacture is reduced, and the reliability and the safety of a system are improved;
on the other hand, under the preset control, the output current waveforms of each pair of power output terminals of the direct-current power supply are similar and staggered by m times of the switching period, so that the current sum of m excitation winding units, namely the ripple and the ripple coefficient of the excitation current of the motor can be reduced; the current sum of the m pairs of electric brushes, namely the ripple and the ripple coefficient of the armature current of the motor are reduced, so that the ripple and the ripple coefficient of the output torque of the motor are reduced, the ripple and the ripple coefficient of the output rotating speed of the motor are reduced, and the electromagnetic interference, vibration and noise of the motor are reduced.
Moreover, when the power output terminal of the direct current power supply and the electric brush, the excitation winding unit and the connecting wire in the motor have faults, only the part where the fault is located needs to be shielded, other normal parts can still work, and because the magnetic field excited by the excitation winding unit of the non-fault part mainly acts on the armature winding branch circuit connected with the corresponding electric brush, the phenomenon of sudden runaway of the traditional series excitation direct current motor is avoided, the reliability and the safety of the system are improved, and the effective output torque is larger.
In conclusion, the series-parallel excitation direct current motor has the advantages of simple structure, short connecting line, simple production process, easiness in manufacturing, convenience in maintenance, low production cost and maintenance cost, reasonable and simple structural design, high reliability and safety and the like; the invention can break monopoly and blockade of foreign countries on the power module, the controller and the high-performance electric driving device, so that the invention not only can be applied to large-load electric equipment such as electric automobiles, electric carriers, rail cars, sightseeing vehicles, trucks and ships, but also can improve the performance of the electric equipment, and can be applied to high-performance electric equipment such as numerical control machines, submarines and the like, thereby realizing the localization of the high-performance electric driving device.
Drawings
Fig. 1 is a schematic longitudinal sectional view of a series-parallel excited dc motor according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a series-parallel excited dc motor according to an embodiment of the present invention;
fig. 3 is a schematic diagram of the circuit connection of the armature winding and the field winding of the series-parallel excited direct current motor of the present invention;
fig. 4 is a schematic diagram of the circuit connection between the armature winding and the field winding of the series-parallel excited dc motor according to the embodiment of the present invention;
fig. 5 is a schematic diagram of the development of a single-lap joint of armature windings of a series-parallel excited dc motor according to an embodiment of the present invention;
fig. 6 is a schematic circuit connection diagram of a conventional series-parallel excited dc motor;
fig. 7 is a waveform diagram of input currents of three pairs of brushes of a series-parallel excitation dc motor according to an embodiment of the present invention;
fig. 8 is a waveform diagram of input currents of three excitation winding units of a series-parallel excited dc motor in the embodiment of the present invention;
fig. 9 is a graph comparing the armature current of a series-parallel excited dc motor according to an embodiment of the present invention with the armature current of a conventional series-parallel excited dc motor;
fig. 10 is a diagram showing comparison of the field current of the series-parallel excited direct current motor according to the embodiment of the present invention and the field current of the conventional series-parallel excited direct current motor; and
fig. 11 is a torque comparison chart of the series-parallel excited dc motor in the embodiment of the present invention and the conventional series-parallel excited dc motor.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
Fig. 1 is a schematic longitudinal sectional view of a series-parallel excited dc motor according to an embodiment of the present invention; fig. 2 is a schematic cross-sectional view of a series-parallel excited dc motor according to an embodiment of the present invention; fig. 3 is a schematic diagram of the circuit connection of the armature winding and the field winding of the series-parallel excited direct current motor of the present invention; fig. 4 is a schematic diagram of the circuit connection between the armature winding and the field winding of the series-parallel excited dc motor according to the embodiment of the present invention; fig. 5 is a schematic unfolded view of an armature winding single-lap joint of a series-parallel excited dc motor according to an embodiment of the present invention.
In the present embodiment, the series-parallel excited dc motor 100 is connected to m pairs of power output terminals formed by at least one dc power source (not shown), and has a rated input current. When the number of the direct current power supplies is 1, the m pairs of power supply output terminals are respectively terminals on m power supply output branches of the direct current power supplies; when the number of the direct current power supplies is m, the m pairs of power supply output terminals are respectively the wiring terminals of the m direct current power supplies. The dc power supply is any one of a chopper, a battery, and a rectified power supply, and in this embodiment, the dc power supply employs a chopper having a switching frequency of 1 khz.
As shown in fig. 1 and 2, the series-parallel excited direct current motor 100 includes a housing 11, a stator 12, brushes 13, a rotor 14, and a junction box (not shown in the drawings). As shown in fig. 3, the number of pairs of brushes is set to m according to the value of the rated input current. As shown in fig. 4 and 5, m is set to 3 in the present embodiment. When the maximum output current of a pair of power supply output terminals is I1Rated input current of the DC motor is ImaxThe logarithm m of the brushes satisfies the following condition: m is more than Imax÷I1。
As shown in fig. 1 to 3, the stator 12 is provided in the housing 11, and includes 3 pairs of 6 main poles 121, one series field winding portion 122, and one shunt field winding portion 123.
As shown in fig. 2, each pair of main poles 121 includes an S-polarity main pole 1211 and an N-polarity main pole 1212. Of all the main poles 121, the polarities of the adjacent 2 main poles 121 are opposite.
As shown in fig. 1 to 3, the series field winding unit 122 includes 3 series field winding units 1221. Each of the series field winding units 1221 is formed by making a series field coil 12211 on each of 3 pairs of main poles 121 by an insulated conductor bar made of a metal wire wrapped with an insulating layer. In this embodiment, the number of turns of the series excitation coil 12211 on each main pole 121 is the same.
The insulated conductor bar in each series field winding unit 1221 has one end and the other end distinguished along a preset current direction of the series field coil 12211, and the S-polarity main pole 1211 and the N-polarity main pole 1212 in each pair of main poles 121 correspond to the winding direction of the series field coil 12211 and the preset current direction of the series field coil 12211. The current circulating directions of the series excitation coils 12211 of two adjacent main poles 121 are opposite.
In each series field winding unit 1221, the connection relationship of the 2m series field coils 12211 is any one of series connection, parallel connection, and series-parallel connection, and the connection relationship of the 2m series field coils 12211 in the respective series field winding units 1221 is the same. In this embodiment, the 2m series excitation coils 12211 are connected in series.
As shown in fig. 1 to 3, the shunt excitation winding part 123 includes 3 shunt excitation winding units 1231, and the 3 shunt excitation winding units 1231 correspond to the 3 pairs of main poles 121, respectively. Each shunt excitation winding unit 1231 is formed by making a shunt excitation coil 12311 on a corresponding pair of main poles 121 by an insulated conductor bar made of a metal wire wrapped with an insulating layer. In this embodiment, the number of turns of the shunt coil 12311 on each main pole 121 is the same.
The insulated conductor bars in each shunt excitation winding unit 1231 have one end and the other end distinguished in a preset current direction of the shunt excitation coil 12311, and current circulating directions of the shunt excitation coils 12311 of adjacent two main poles 121 are opposite. In this embodiment, the current circulating directions of the series excitation coil 12211 and the shunt excitation coil 12311 in each of the main poles 121 are the same.
In each shunt excitation winding unit 1231, the connection relationship of the 2 shunt excitation coils 12311 is any one of series connection and parallel connection, and the connection relationship of the 2 shunt excitation coils 12311 in the respective shunt excitation winding units 1231 is the same. In this embodiment, the 2 shunt excitation coils 12311 are connected in series.
The insulated conductor strip of the series excitation winding unit 1221 and the insulated conductor strip of the parallel excitation winding unit 1231 are any one of an enameled wire and an insulated copper conducting strip, respectively.
As shown in fig. 1 and 2, 6 brushes 13 in 3 pairs are fixedly disposed in the housing 11, and each pair of brushes 13 includes an S-pole corresponding brush 131 corresponding to the S-polarity main pole 1211 and an N-pole corresponding brush 132 corresponding to the N-polarity main pole 1212. The 2 brushes 13 of each pair of brushes 13 are positioned adjacently, and each pair of brushes 13 corresponds to the spatial position of each corresponding pair of main magnetic poles 121.
The brush 13 is any one of a narrow brush and a wide brush, and the brush 13 is a narrow brush in the present embodiment. Each brush 13 comprises a brush body or at least two separately formed brush bodies arranged axially of the machine and electrically connected in parallel, in this embodiment the brush 13 comprises a brush body.
As shown in fig. 3, m series-excited ends of the insulated conductor bars of all the series-excited winding units 1221 are electrically connected to m N-pole corresponding brushes 132 of all the brushes 13; the m series excitation other ends of the insulated conductor strips of all the series excitation winding units 1221 form m first terminals 1511, the leading-out ends of the m S-pole corresponding brushes 131, which are not connected with the m series excitation one ends, form m second terminals 1512, the m first terminals 1511 and the m second terminals 1512 respectively form m pairs of external connection terminals (i.e., m connection units) correspondingly, and the m pairs of external connection terminals are used for being connected with the m pairs of power output terminals in a one-to-one correspondence manner. Of course, if necessary, the m series excited ends of the insulated conductor bars of all the series excitation winding units 1221 are electrically connected to the m brushes 131 corresponding to the S poles in all the brushes 13, and the m leading ends of the m brushes 132 corresponding to the N poles, which are not connected to the ends of the insulated conductor bars of the m series excitation winding units 1221, form m second terminals 1512.
The m shunt excitation ends of the insulated conductor bars in all the shunt excitation winding units 123 are connected to the m first terminals 1511 in a one-to-one correspondence manner, and the m shunt excitation other ends of the insulated conductor bars in all the shunt excitation winding units 123 are connected to the m second terminals 1512 in a one-to-one correspondence manner. Of course, if necessary, the m shunt-excited other ends of the insulated conductor bars in all the shunt-excited winding units 123 are connected to the m first terminals 1511 in a one-to-one correspondence manner, and meanwhile, the m shunt-excited ends of the insulated conductor bars in all the shunt-excited winding units 123 are connected to the m second terminals 1512 in a one-to-one correspondence manner.
In this embodiment, as shown in fig. 2 and fig. 4, the first terminal 1511 and the second terminal 1512 form 1 pair of external connection terminals 151, the first terminal 1521 and the second terminal 1522 form 1 pair of external connection terminals 152, and the first terminal 1531 and the second terminal 1532 form 1 pair of connection terminals 153, and 3 pairs of external connection terminals (i.e., 3 connection units) 151, 152 and 153 for connecting to 3 pairs of power output terminals in a one-to-one correspondence manner. The excitation effect of the 3 series excitation winding units 122 and the corresponding 3 shunt excitation winding units 123 may be one of integral excitation and differential excitation, in this embodiment, integral excitation, where the magnetic field excited by the main pole is large, and the motor torque is large.
As shown in fig. 1 and 2, the rotor 14 is disposed in the stator 12, and includes a plurality of armature windings 141 coupled to each other by a predetermined coupling method, the number of the armature windings 141 is set to 2m × n, and the predetermined coupling method is any one of a single-winding, a multiple-winding, and a complex wave. In this embodiment, as shown in fig. 5, the plurality of armature windings 141 are connected in a single-layer manner, and 2 adjacent brushes 13 are connected to one armature winding branch, each of which contains n armature windings 141.
A junction box (not shown) is fixed to the cabinet 11, and 3 pairs of external connection terminals 151, 152 and 153 are provided in the junction box as shown in fig. 2 and 4.
Fig. 6 is a schematic circuit connection diagram of a conventional series-parallel excited dc motor; fig. 7 is a waveform diagram of input currents of three pairs of brushes of a series-parallel excitation dc motor according to an embodiment of the present invention; fig. 8 is a waveform diagram of input currents of three field winding units of a series-parallel excited dc motor in the embodiment of the present invention; fig. 9 is a graph comparing the armature current of a series-parallel excited dc motor according to an embodiment of the present invention with the armature current of a conventional series-parallel excited dc motor; fig. 10 is a diagram showing comparison of the field current of the series-parallel excited direct current motor according to the embodiment of the present invention and the field current of the conventional series-parallel excited direct current motor; fig. 11 is a torque comparison chart of the series-parallel excited dc motor in the embodiment of the present invention and the conventional series-parallel excited dc motor.
As shown in fig. 6, the conventional series-parallel excited dc motor 600 has only 1 wiring unit at its terminals, which is electrically connected to 1 pair of power output terminals of 1 chopper (not shown) having a switching frequency of 1 khz.
In steady state, the current ripple is the difference between the maximum and minimum values, and the ripple factor is the percentage of the difference between the maximum and minimum values and the average value.
As shown in fig. 7, in the series-parallel excitation dc motor in this embodiment, the ripple of the input current of each of the three pairs of brushes A1B1, A2B2, and A3B3 is equal to 130.38-120.40-9.98 amperes, the average value is equal to 125.39 amperes, and the ripple coefficients are equal to 9.98/125.39 × 100% -7.96%.
As shown in fig. 8, in the present embodiment, the current ripples of the three series excitation winding units 1221, 1222, and 1223 of the series-parallel excitation dc motor are all equal to 130.38-120.40-9.98 amperes, the average value is all equal to 125.39 amperes, and the ripple coefficients are all equal to 9.98/125.39 × 100% -7.96%. The current ripples of the three shunt excitation winding units 1231, 1232 and 1233 are all equal to 72.29-71.59-0.70 amperes, the average value is all equal to 71.94 amperes, and the ripple coefficients are all equal to 0.70/71.94 × 100% -0.97%.
As shown in fig. 9, in a steady state, the armature current of the series-parallel excitation dc motor in the present embodiment is equal to the sum of the currents of the three pairs of brushes A1B1, A2B2, and A3B3, the ripple of the armature current is 377.82-374.51-3.31 amperes, the average value is 376.16 amperes, and the ripple coefficients are all equal to 3.31/376.16 × 100% — 0.88%. The armature current ripple of the traditional series-parallel excitation direct current motor is equal to 391.14-361.17-29.97 amperes, the average value is equal to 376.16 amperes, and the ripple factor is equal to 29.97/376.16 × 100% -7.97%. Although the average value of the armature current of the series-parallel excited dc motor in this embodiment is the same as that of the conventional series-parallel excited dc motor, the ripple and the ripple coefficient of the armature current of the series-parallel excited dc motor in this embodiment are only one ninth of those of the conventional series-parallel excited dc motor.
As shown in fig. 10, in a steady state, the excitation current of the series-parallel excitation dc motor in the present embodiment is equal to the sum of the currents of the three series excitation winding units 1221, 1222, 1223 and the three parallel excitation winding units 1231, 1232, 1233, the ripple of the excitation current is 593.76-590.22 ═ 3.54 amperes, the average value is 591.99 amperes, and the ripple coefficients are all equal to 3.54/591.99 × 100%: 0.60%. The armature current ripple of the traditional series-parallel excited dc motor is equal to 608.02-575.95-32.07 ampere, the average value is equal to 591.99 ampere, and the ripple factor is equal to 32.07/591.99 × 100-5.42%. Although the average value of the excitation current of the series-parallel excitation dc motor in this embodiment is the same as that of the conventional series-parallel excitation dc motor, both the ripple and the ripple coefficient of the excitation current of the series-parallel excitation dc motor in this embodiment are only one ninth of those of the conventional series-parallel excitation dc motor.
As is known, the electromagnetic torque and the equation of motion of the series-parallel excited dc motor are as follows
Figure BDA0002280757640000161
Wherein, TemIs an electromagnetic torque; cTIs a torque constant; phi is the magnetic flux of the main magnetic field; l isafIs the mutual inductance of the excitation winding part and the armature winding and is a constant; i isfIs an exciting current; i isaIs the armature current; t isloadIs the load torque; j is the moment of inertia of the load, which is a constant; Ω is the output angular velocity.
In this embodiment, the input current of the series-parallel excited dc motor is equal to the sum of the armature current and the parallel excitation current, and is also equal to the sum of the series excitation current and the parallel excitation current, and the rated input current of the series-parallel excited dc motor is the maximum input current of the motor in the rated operating state.
In the formula (1), the electromagnetic torque TemAnd armature current IaProportional to the product of the magnetic flux phi of the main magnetic field excited by the field winding of the DC motor fed by the chopper, and the electromagnetic torque T is shown by the equation (1)emAnd armature current IaAnd an excitation current IfProportional to the product of (a) and (b), excitingCurrent IfRipple factor and armature current IaWill result in an electromagnetic torque TemThe ripple factor, ripple or ripple of the output angular velocity Ω, which is larger, is more poor, and the performance of the driving device and the electric equipment is worse.
In this embodiment, LafTaking 1, in a steady state, as shown in fig. 11, the ripple of the motor torque of series-parallel excitation direct current in the present embodiment is equal to 224331.78-221042.30-3289.48 n.m, the average value is equal to 222686.66n.m, and the ripple factor is equal to 3289.48/222686.66-1.48%. The torque ripple of the conventional series-parallel excitation direct current motor is 237820.34-208017.82-29802.52 n.m, the average value is 222765.80n.m, and the ripple coefficient is 29802.52/222765.80-13.38%.
That is to say, although the average torque value of the series-parallel excitation dc motor in this embodiment is substantially the same as that of the conventional series-parallel excitation dc motor, the ripple and the ripple coefficient of the torque of the series-parallel excitation dc motor in this embodiment are only one ninth of those of the conventional series-parallel excitation dc motor, which reduces the ripple and the ripple coefficient of the output torque of the motor, further reduces the ripple and the ripple coefficient of the output rotation speed of the motor, and finally achieves the purpose of reducing the electromagnetic interference, vibration, and noise of the motor.
Effects and effects of the embodiments
According to the series-parallel excited dc motor provided in this embodiment, since the series excitation winding part includes m series excitation winding units, the parallel excitation winding part includes m parallel excitation winding units, the m parallel excitation winding units correspond to the m pairs of main poles respectively, each series excitation winding unit is formed by making series excitation coils on the m pairs of main poles through an insulated conductor strip formed by metal wires wrapped with insulating layers respectively, each parallel excitation winding unit is formed by making parallel excitation coils on the corresponding pair of main poles through an insulated conductor strip formed by metal wires wrapped with insulating layers respectively, the insulated conductor strip in each series excitation winding unit is provided with a series excitation end and a series excitation other end, the insulated conductor strip in each parallel excitation winding unit is provided with a parallel excitation end and a parallel excitation other end, and the m series excitation ends of the insulated conductor strips of all the series excitation winding units are electrically connected with the m S pole corresponding electric brushes in all the electric brushes; or m series excitation ends of the insulated conductor strips of all the series excitation winding units are electrically connected with m N pole corresponding brushes in all the brushes, m series excitation other ends of the insulated conductor strips of all the series excitation winding units form m first terminals, leading-out ends of m brushes which are not connected with m series excitation ends form m second terminals, m first terminals and m second terminals respectively form m pairs of external connecting terminals correspondingly, the m pairs of external connecting terminals are used for being connected with m pairs of power output terminals in a one-to-one correspondence manner, m parallel excitation ends of the insulated conductor strips in all the parallel excitation winding units are respectively connected with m first terminals in a one-to-one correspondence manner, and simultaneously m parallel excitation other ends of the insulated conductor strips in all the parallel excitation winding units are respectively connected with m second terminals in a one-to-one correspondence manner; or, m shunt excitation other ends of the insulated conductor bars in all the shunt excitation winding units are respectively connected with m first terminals in a one-to-one correspondence manner, and simultaneously, m shunt excitation ends of the insulated conductor bars in all the shunt excitation winding units are respectively connected with m second terminals in a one-to-one correspondence manner, that is, each pair of external connection terminals are connected with a series excitation winding unit and a pair of brushes which are connected in series at first and a shunt excitation winding unit which is connected in parallel at second, so on one hand, branches formed by each series excitation winding unit and a pair of brushes and shunt excitation winding units which are connected in parallel are mutually independent, the current of each branch is also independent, and each branch can independently work and is independently supplied by a corresponding pair of power output terminals, that is: each pair of power output terminals only bears the working current of one branch circuit and only has one m-th of the rated input current of the motor. For the motor with very large rated input current, as long as m is large enough, the working current of each branch circuit or the output current of each pair of power output terminals can be correspondingly reduced, so that the output current of the power output terminals can be reduced to the value which can meet the requirements of the high-power high-performance motor by using a common power switch tube without adopting a power module or a parallel current sharing technology, the cost of a direct-current power supply is reduced, the requirements of a connecting wire and a connecting piece between an external wiring terminal and the power output terminals on contact resistance and insulation are also reduced, the difficulty of production and manufacture is reduced, and the reliability and the safety of a system are improved;
on the other hand, under the preset control, the output current waveforms of each pair of power output terminals of the direct-current power supply are similar and staggered by m times of the switching period, so that the current sum of m excitation winding units, namely the ripple and the ripple coefficient of the excitation current of the motor can be reduced; the current sum of the m pairs of electric brushes, namely the ripple and the ripple coefficient of the armature current of the motor are reduced, so that the ripple and the ripple coefficient of the output torque of the motor are reduced, the ripple and the ripple coefficient of the output rotating speed of the motor are reduced, and the electromagnetic interference, vibration and noise of the motor are reduced.
Moreover, when the power output terminal of the direct current power supply and the electric brush, the excitation winding unit and the connecting wire in the motor have faults, only the part where the fault is located needs to be shielded, other normal parts can still work, and because the magnetic field excited by the excitation winding unit of the non-fault part mainly acts on the armature winding branch circuit connected with the corresponding electric brush, the phenomenon of sudden runaway of the traditional series excitation direct current motor is avoided, the reliability and the safety of the system are improved, and the effective output torque is larger.
In summary, the series-parallel excitation direct current motor of the embodiment has the advantages of simple structure, short connecting line, simple production process, easy manufacture, convenient maintenance, low production cost and maintenance cost, reasonable and simple structural design, high reliability and safety and the like; the invention can break monopoly and blockade of foreign countries on the power module, the controller and the high-performance electric driving device, so that the invention not only can be applied to large-load electric equipment such as electric automobiles, electric carriers, rail cars, sightseeing vehicles, trucks and ships, but also can improve the performance of the electric equipment, and can be applied to high-performance electric equipment such as numerical control machines, submarines and the like, thereby realizing the localization of the high-performance electric driving device.
In addition, each brush comprises at least two separately formed brush bodies which are arranged along the axial direction of the motor and are electrically connected in parallel, so that the actual contact area of each brush and the commutator is increased, and the commutation performance of the brush is improved.
In addition, because the number of turns of the series excitation coil on each main magnetic pole is the same, and the number of turns of the parallel excitation coil is the same, the magnetic field of the motor is uniform and the torque is constant when the motor works normally.
In addition, because each pair of main magnetic poles corresponds to the space position of the corresponding pair of brushes, the magnetic field intensity in the armature winding can be kept maximum when a fault occurs, and therefore the maximum torque can be generated.
In addition, because the direct current power supply is any one of a chopper, a battery and a rectifying power supply, when the direct current power supply is the chopper or the rectifying power supply, the power switch tube does not need to adopt a power module or a parallel current sharing technology, and therefore cost is reduced. When the direct current power supply is a battery, the number of parallel branches in the battery is reduced, the battery balance problem generated after a plurality of battery monomers are connected in parallel is reduced, the cost generated by screening the consistency of the battery monomers is also reduced, the overall performance attenuation of the battery caused by parallel connection is reduced, and the energy density, the power, the performance, the durability and the safety are provided.
The foregoing shows and describes the general principles, essential 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, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A series-parallel excited direct current motor connected to m pairs of power output terminals formed by at least one direct current power supply, comprising:
a housing;
m pairs of electric brushes fixed in the machine shell;
a stator disposed in the case, including m pairs of main poles corresponding to the m pairs of brushes, and including a series field winding portion and a shunt field winding portion; and
a rotor disposed in the stator and including a plurality of armature windings coupled to each other in a predetermined coupling manner,
wherein each pair of the main magnetic poles comprises an S-polarity main magnetic pole and an N-polarity main magnetic pole,
the polarities of the adjacent 2 main magnetic poles are different,
the 2 brushes in each pair are located adjacent,
each pair of the brushes comprises an S-pole corresponding brush corresponding to the S-pole main magnetic pole and an N-pole corresponding brush corresponding to the N-pole main magnetic pole,
the series excitation winding part comprises m series excitation winding units,
the shunt excitation winding part comprises m shunt excitation winding units which are respectively corresponding to the m pairs of main magnetic poles,
each series excitation winding unit is formed by respectively manufacturing series excitation coils on the m pairs of main magnetic poles through insulated conductor bars formed by metal wires wrapped with insulating layers,
each parallel excitation winding unit is formed by respectively manufacturing parallel excitation coils on a pair of corresponding main magnetic poles through insulated conductor bars formed by metal wires wrapped with insulating layers,
the insulated conductor strip in each series excitation winding unit is provided with a series excitation end and a series excitation other end,
the insulated conductor bars in each shunt excitation winding unit have a shunt excitation end and a shunt excitation end,
the m series excitation ends of the insulated conductor bars of all the series excitation winding units are electrically connected with m S pole corresponding brushes in all the brushes; or, m series excitation ends of the insulated conductor bars of all the series excitation winding units are electrically connected with m N pole corresponding brushes in all the brushes,
m of the series-excited other ends of the insulated conductor bars of all the series-excited winding units form m first terminals,
the leading-out terminals of the m brushes which are not connected with the m series excitation terminals form m second terminals,
m pairs of external connection terminals are formed by the m first terminals and the m second terminals respectively,
m pairs of the external connection terminals are used for being connected with m pairs of the power output terminals in a one-to-one correspondence manner,
the m shunt excitation ends of the insulated conductor bars in all the shunt excitation winding units are correspondingly connected with the m first wiring terminals one by one, and meanwhile, the m shunt excitation other ends of the insulated conductor bars in all the shunt excitation winding units are correspondingly connected with the m second wiring terminals one by one; or the m shunt excitation other ends of the insulated conductor bars in all the shunt excitation winding units are correspondingly connected with the m first wiring terminals one by one, and meanwhile, the m shunt excitation ends of the insulated conductor bars in all the shunt excitation winding units are correspondingly connected with the m second wiring terminals one by one,
and m is a positive integer not less than 2.
2. A series-parallel excited direct current motor connected to m pairs of power output terminals formed by at least one direct current power supply, comprising:
a housing;
m pairs of electric brushes fixed in the machine shell;
a stator disposed in the case, including m pairs of main poles corresponding to the m pairs of brushes, and including a series field winding portion and a shunt field winding portion; and
a rotor disposed in the stator and including a plurality of armature windings coupled to each other in a predetermined coupling manner,
wherein each pair of said brushes comprises 2 adjacently positioned brushes,
the series excitation winding part comprises m series excitation winding units,
the shunt excitation winding part comprises m shunt excitation winding units which are respectively corresponding to the m pairs of main magnetic poles,
each series excitation winding unit is formed by connecting series excitation coils respectively made on the m pairs of main magnetic poles by insulated conductor bars formed by metal wires wrapped with insulating layers,
each parallel excitation winding unit is formed by connecting parallel excitation coils which are respectively made on a pair of corresponding main magnetic poles by insulated conductor bars formed by metal wires wrapped with insulating layers,
the insulated conductor strip in each of the series excitation winding units has a series excitation end and a series excitation other end which are distinguished in a preset current direction of the series excitation coil,
the insulated conductor strip in each shunt excitation winding unit has a shunt excitation end and a shunt excitation end which are distinguished along a preset current direction of the shunt excitation coil,
each pair of the main magnetic poles comprises an S-polarity main magnetic pole and an N-polarity main magnetic pole which correspond to the winding direction of the series excitation coil in the series excitation winding unit and the preset current direction of the series excitation coil,
the polarities of the adjacent 2 main magnetic poles are different,
each pair of the brushes comprises an S-pole corresponding brush corresponding to the S-pole main magnetic pole and an N-pole corresponding brush corresponding to the N-pole main magnetic pole,
the m series excitation ends of the insulated conductor bars of all the series excitation winding units are electrically connected with m S pole corresponding brushes in all the brushes; or, m series excitation ends of the insulated conductor bars of all the series excitation winding units are electrically connected with m N pole corresponding brushes in all the brushes,
m of the series-excited other ends of the insulated conductor bars of all the series-excited winding units form m first terminals,
the leading-out terminals of the m brushes which are not connected with the m series excitation terminals form m second terminals,
m pairs of external connection terminals are formed by the m first terminals and the m second terminals respectively,
m pairs of the external connection terminals are used for being connected with m pairs of the power output terminals in a one-to-one correspondence manner,
the m shunt excitation ends of the insulated conductor bars in all the shunt excitation winding units are correspondingly connected with the m first wiring terminals one by one, and meanwhile, the m shunt excitation other ends of the insulated conductor bars in all the shunt excitation winding units are correspondingly connected with the m second wiring terminals one by one; or the m shunt excitation other ends of the insulated conductor bars in all the shunt excitation winding units are correspondingly connected with the m first wiring terminals one by one, and meanwhile, the m shunt excitation ends of the insulated conductor bars in all the shunt excitation winding units are correspondingly connected with the m second wiring terminals one by one,
and m is a positive integer not less than 2.
3. The series-parallel excited direct current motor according to claim 1 or 2, wherein:
wherein each brush comprises one brush body or at least two separately shaped brush bodies arranged axially of the machine and electrically connected in parallel.
4. The series-parallel excited direct current motor according to claim 1 or 2, wherein:
the number of the direct current power supplies is 1, and the m pairs of power supply output terminals are respectively terminals on m power supply output branches of the direct current power supplies.
5. The series-parallel excited direct current motor according to claim 1 or 2, wherein:
the number of the direct current power supplies is m, and the m pairs of power supply output terminals are respectively terminals of the m direct current power supplies.
6. The series-parallel excited direct current motor according to claim 1 or 2, wherein:
the insulated conductor bar is any one of an enameled wire and an insulated copper conducting bar.
7. The series-parallel excited direct current motor according to claim 1 or 2, wherein:
wherein the number of turns of the series exciting coil in the series exciting winding unit on each main magnetic pole is the same,
the number of turns of the shunt excitation coil in the shunt excitation winding unit on each main pole is the same,
the current surrounding directions of the series excitation coil and the shunt excitation coil on each main magnetic pole are the same,
each pair of main magnetic poles corresponds to the space position of the corresponding pair of electric brushes.
8. The series-parallel excited direct current motor according to claim 1 or 2, wherein:
wherein, in each series field winding unit, the connection relation of 2m series field coils is any one of series connection, parallel connection and series-parallel connection,
the connection relations of the 2m series exciting coils in each series exciting winding unit are the same,
in each of the shunt excitation winding units, 2 of the shunt excitation coils are connected in any one of series and parallel,
the connection relation of the 2 shunt excitation coils in each shunt excitation winding unit is the same.
9. The series-parallel excited direct current motor according to claim 1 or 2, wherein:
wherein the predetermined coupling manner is any one of a single stack, a multiple stack, and a complex wave.
10. The series-parallel excited direct current motor according to claim 1 or 2, wherein:
wherein, the direct current power supply is any one of a chopper, a battery and a rectification power supply.
CN201911139124.7A 2019-11-21 2019-11-21 Series-parallel excitation direct current motor Withdrawn CN112825446A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911139124.7A CN112825446A (en) 2019-11-21 2019-11-21 Series-parallel excitation direct current motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911139124.7A CN112825446A (en) 2019-11-21 2019-11-21 Series-parallel excitation direct current motor

Publications (1)

Publication Number Publication Date
CN112825446A true CN112825446A (en) 2021-05-21

Family

ID=75906716

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911139124.7A Withdrawn CN112825446A (en) 2019-11-21 2019-11-21 Series-parallel excitation direct current motor

Country Status (1)

Country Link
CN (1) CN112825446A (en)

Similar Documents

Publication Publication Date Title
CN110518772B (en) Parallel-series excitation direct current motor
CN110518771B (en) Series-parallel excitation direct current motor
CN110518770B (en) Series excitation direct current motor
CN110518773B (en) Separately excited direct current motor
CN112825448B (en) Series-parallel excitation direct current motor
CN112825449B (en) Parallel-series excitation direct current motor
CN110518769B (en) Shunt-excited direct-current motor
CN111277098A (en) Parallel-series excitation direct current motor
US11329582B2 (en) Series shunt wound DC motor driving device and equipment
US11355973B2 (en) Direct current motor
CN112825447B (en) Parallel-series excitation direct current motor
US11387717B2 (en) Series wound direct-current motor driving device and equipment
WO2019223253A1 (en) Direct current motor
CN112825446A (en) Series-parallel excitation direct current motor
CN111277097A (en) Series-parallel excitation direct current motor
CN111277099A (en) Separately excited DC motor
CN111277095A (en) Shunt-excited direct current motor
CN111277096A (en) Series excited DC motor
US11329581B2 (en) Shunt series wound direct current (DC) motor driving device and equipment
CN217486257U (en) Multi-phase motor, electric drive device, and electric device
CN112821820A (en) Permanent magnet type direct current motor driving device and electric equipment
US11394278B2 (en) Shunt wound DC motor driving device and electrical equipment
US11239775B1 (en) Separately excited direct current motor drive apparatus and equipment
CN113078858A (en) Motor drive device and electric device
CN111313777A (en) Permanent magnet type DC motor driving device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WW01 Invention patent application withdrawn after publication

Application publication date: 20210521

WW01 Invention patent application withdrawn after publication