KR20170107727A - The Ac motor with double atator structure and theof controlling method - Google Patents

The Ac motor with double atator structure and theof controlling method Download PDF

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Publication number
KR20170107727A
KR20170107727A KR1020160031422A KR20160031422A KR20170107727A KR 20170107727 A KR20170107727 A KR 20170107727A KR 1020160031422 A KR1020160031422 A KR 1020160031422A KR 20160031422 A KR20160031422 A KR 20160031422A KR 20170107727 A KR20170107727 A KR 20170107727A
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KR
South Korea
Prior art keywords
stator
rotor
yoke
alternating
motor
Prior art date
Application number
KR1020160031422A
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Korean (ko)
Inventor
성상준
비.에이.케이 제임스
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성상준
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Priority to KR1020160031422A priority Critical patent/KR20170107727A/en
Publication of KR20170107727A publication Critical patent/KR20170107727A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H02K16/04—Machines with one rotor and two stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
    • 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
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/0004—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
    • 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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/06—Linear motors
    • H02P25/062—Linear motors of the induction type

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Induction Machinery (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The present invention relates to an alternating-current motor having a double stator structure and a control method thereof. More specifically, the present invention relates to an alternating-current motor having a double stator structure and a control method thereof. More specifically, a conventional stator for electrically generating a rotor system is disposed inside and outside the rotor 4, A donut-shaped cylindrical rotor 4 is placed between the yoke of the outer stator 2 and the yoke of the inner stator 3a to allow the inner and outer stator windings to have a stronger rotating system and to connect the multiple windings in parallel To an alternating-current motor having a double stator structure capable of supplying a selective power to a winding switch, and a control method thereof.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC motor having a double stator structure and a control method thereof,

The present invention relates to an alternating-current motor having a double stator structure. More specifically, the present invention relates to an alternating-current motor having a double stator structure, in which a stator for forming a rotating electric system is disposed inside and outside a rotor to increase efficiency and torque, The present invention relates to an AC motor having a double stator structure in which multiple windings are connected in parallel so as to supply power to multiple stator windings and which can be selectively powered by a switch, and a control method thereof.

Generally, an alternating-current motor is composed of a stator that forms a rotating system and a pendulum that rotates by a rotating system. The rotor is divided into a crane type and a winding type according to the structure,

The conductor to be coupled to the iron core in the rotor 4 is composed of a copper rod (or aluminum rod) and a shorting ring.

That is, as shown in Figs. 1 and 2, the conventional induction motor includes an outer stator core and a stator winding which form a rotor system, and a rotor 4 rotated by a rotor system is connected to a rotor core and a rotor cage .

Also, the rotor cage is connected to a copper rod (or an aluminum rod) and a short-circuited ring to generate an electromotive force.

Therefore, when a rotating magnetic field is generated in the clockwise direction, the rotor 4 is moved in the opposite direction, and an electromotive force is generated in the rotor 4 according to the right-hand rule of Fleming by the magnetic flux generated by the rotating magnetic field.

This electromotive force is again applied to Fleming's left-hand rule to rotate the rotor clockwise.

At this time, since the conductor has to link the rotating magnetic field, the rotational speed of the conductor is slower than that of the rotating magnetic field.

At this time, the synchronous speed (f = frequency, p = number of poles) is the operation speed since the AC motor is operated in a state where the slip occurs at all times. (S = sleep)

Therefore, the AC motor is advantageous in various fields of industry where high performance control is required due to the advantage that there is no problem of maintenance and repair due to mechanical abrasion of the brush and commutator member as compared with a DC motor.

AC motors are most commonly used in general household appliances to industrial machines. AC motors operate at an efficiency of about 80 to 90% at full load, but as the load increases, the slip increases. On the other hand, The efficiency drops sharply under light loads, and in particular, the smaller the capacity, the lower the efficiency.

About 60% of the total power consumption in most countries, including Korea, is consumed by electric motors. According to a research report by the Electric Power Reserch Institute (EPRI) in the US, about 70% of industrial AC motors are rated at 60 % Or less (light load and no-load operation, over-design). In this way, most of the electric motors, including AC motors, operate at a lower efficiency than the stipulated, so that a lot of electric power is wasted.

Therefore, the high efficiency of AC motors has become a major issue for national energy conservation.

The loss of AC motor is divided into electric loss and mechanical loss. In addition, it is divided into load loss which varies according to the load, idle state where no load is applied, unloaded loss which is lost during no load operation, It is separated by hand.

Conventional high efficiency has been focused on minimizing the loss of each part of the device by the optimum design and the use of high-grade materials.

That is, in order to reduce copper loss, it is necessary to reduce the current density by increasing the copper amount of the coil and the iron amount of the iron core, and to make the thickness thinner with a small coercive force such as pure iron and silicon steel to reduce iron loss, To reduce drift load hand, optimize gap and number of slots between stator and rotor, improve insulation performance, improve bearing select line and its lubrication structure, and optimize mechanism such as cooling fan to reduce machine hand.

As described above, the optimum design of the apparatus and the use of high-grade materials substantially increase the efficiency by 5 to 10% compared with the standard.

However, such a method has a problem of not only improving the efficiency but also increasing the initial investment cost of the user because the volume of the device is increased and the production cost of the product is increased by more than 40%.

Further, the AC motor is a principle in which a rotor system is formed in a conventional outer stator and the rotor is rotated by this rotor system. Therefore, the length of the outer stator is relatively long as the outer diameter of the rotor, so that iron loss due to the rotor iron core is increased and generation of a strong magnetic field is impossible.

In order to solve the above-mentioned problems, the present invention is to provide an induction motor that maintains the volume of an AC motor as well as a rotor system by a conventional outer stator, By forming a stator and forming a rotating system in the same direction as the outside, the torque is increased by a stronger magnetic field, and consequently the efficiency and torque are increased.

According to a preferred embodiment of the present invention, there is provided an alternating-current motor comprising: an inner and outer stator which are assembled on an outer side and an inner side of a rotor, and the inner stator and the outer stator are connected to form a rotating system in the same direction, There is provided an alternating-current motor having a double stator structure in which a stronger rotating magnetic field is applied and a repulsive electromotive force is larger than that of the conventional one, and a control method thereof.

As described above, according to the AC motor of the present invention, by combining the outer stator and the inner stator at the inner and outer sides of the rotor, the lengths of the outer stator and the inner stator are shortened, so that a stronger magnetic field is produced and the iron loss of the rotor core is reduced So that efficiency and torque are increased.

In addition, since the rotor core area is small in the rotor, the rotational inertia is small, so energy efficiency is high when the motor is driven by repeating the stop and rotation, and the loss of the iron core is minimized.

Further, since the iron core area of the inner stator can be reduced, the weight of the AC electric motor itself can be reduced.

Generally, the starting current is six times the rated current at the start of the motor. However, the present invention can be shifted only by the motor itself without a separate transmission at startup of the electric vehicle, And the electric power can be efficiently used by applying a magnetic field to the rotor 4 having a small turning radius.

The AC motor according to the present invention can be used in a conventional manner when the power source is operated in a single phase, such as an inverter type, a capacitor starting type, a siding coil type, and a capacitor starter-capacitor operation type.

1 is a plan view showing a conventional AC electric motor.
2 is a perspective view showing a conventional AC motor rotor.
3 is a sectional view showing an alternating-current motor of the present invention.
4 is a plan view showing a stator of an AC motor according to the present invention.
5 is a perspective view showing a rotor of an AC motor according to the present invention.
6 is a cross-sectional view showing another embodiment of the AC motor according to the present invention.
7 is a plan view showing another embodiment of the stator of an AC electric motor of the present invention.
8 is a plan view showing another embodiment of an alternating-current motor rotor of the present invention.
9 is a block diagram showing a control flow of an AC motor according to the present invention.

FIG. 3 is a cross-sectional view of an AC motor according to the present invention, FIG. 4 is a plan view showing a stator of the AC motor according to the present invention, and FIG. 5 is a perspective view showing the rotor of the AC motor.

In the AC motor of the present invention, the rotor 4 is deformed into the donut-shaped cylindrical rotor 4 in the state where the yoke of the outer stator 2 and the yoke of the first inner stator 3a are provided, And between the outer stator 2 and the first inner stator 3a in a state where the yoke of the outer stator 2 and the yoke of the first inner stator 3a are respectively located on the inner side and the inner side.

The windings of the outer stator 2 and the first inner stator 3a are connected so that the magnetic field directions of the outer stator 2 and the first inner stator 3a are the same and the area of the iron core of the rotor 4 is also small The iron loss is reduced and the rotational inertia is also reduced.

The rotor 4 includes a rotor 4 having short-circuited rings at both ends of a copper rod in a state that the copper rods are arranged in a donut-shaped cylindrical shape, and an outer stator 4 2) The yoke and the yoke of the first inner stator 3a are located and rotate by the inner and outer rotor systems.

The alternating-current motor includes a first inner stator (3a) yoke having a turn hole formed at its center so as to penetrate both ends in a cylindrical shape and having bearings (5) at one side thereof and a second yoke A connecting shaft extending in a coaxial line and a connecting shaft connected to an end of the connecting shaft to form a cylindrical shape so as to close the outer circumferential surface of the yoke of the first inner stator 3a, A bearing 5 coupled to a rotating hole located at the other end of the yoke of the outer stator 2 and a bearing 5 coupled between the first inner stator 3a and the outer stator 2, A shorting ring coupled to one end of the rotor 4 and a rotating ball formed between the shorting ring and the rotor 4 and between the first inner stator 3a and the outer stator 2, And is combined with the inserted rotation axis 6.

FIG. 6 is a cross-sectional view showing another embodiment of the AC motor according to the present invention, and FIG. 7 is a plan view showing the motor shown in FIG.

The AC motor of the present invention comprises a cylindrical outer stator (2) yoke with one end open, a first inner stator (3a) yoke and a first inner stator (3a) inside the yoke of the outer stator The rotors 4a and 4b are located on the outer circumferential surfaces of the yokes of the first and second inner stator 3a and 3b while the yokes of the second inner stator 3b are located, The inner stator 3a, 3b has a structure in which the rotary shaft 6 is coupled to the center of the yoke and the rotors 4a, 4b.

More specifically, the AC motor includes a cylindrical outer stator (2) yoke having an open end at one end, a connecting shaft formed coaxially with the inner center of the outer stator (2), and a cylindrical shaft A connecting shaft formed coaxially with the inner circumference of the inner yoke of the first inner stator 3a and having one end opened in a cylindrical shape at one end of the connecting shaft; A connecting shaft formed at the center of the inner peripheral surface of the yoke of the second inner stator 3b and a rotating hole formed at the center of the yokes of the first and second inner stator 3a and 3b, Rotors 4a and 4b respectively coupled to the outer circumferential surfaces of the two inner stator 3a and 3b yoke and a rotary shaft 6 and a bearing 5 inserted and coupled with the rotary shaft.

In addition, the rotors 4 are arranged in multiple stages with different sizes, and a current can be selectively supplied by a switch, thereby controlling the rotational torque.

In a typical AC motor, the starting current is six times the rated current. The efficiency is very low when the motor is stopped and started repeatedly during operation. According to the present invention, when starting, the current is supplied to the rotor 4a having a large turning radius, (4b) to increase the efficiency. This is considered to be very useful for electric vehicles using electric motors.

In this drawing, although two stages are shown, they may be implemented in three or more stages.

9 is a control flow chart of the present invention in which the rotational speed and current of the electric motor are detected by the encoder for detecting the speed of the electric motor and the current sensor for detecting the electric current of each phase to reach the target set value. Each phase is controlled by PWM to control the voltage and current, and the first, second and third winding switches 11a, 11b and 11c enable selection of the fixed winding. It is an object of the present invention to maximize the efficiency by selectively supplying power to the external fixed winding or the internal fixed winding according to the running state of the motor. Also in the multi-stage rotor system, a switch and a fixed winding can be added and utilized.

2: outer stator 3a, 3b: first and second inner stator
4: rotors 4a, 4b: first and second rotors
5: Bearing 6: Rotary shaft
10a, 10b, 10c: first, second and third stator windings
11a, 11b, 11c: first, second and third winding switches

Claims (5)

An alternating-current motor in which a rotor (4) rotating by a rotating shaft (6) is located inside a stator yoke to electrically generate a rotating system,
Wherein an outer stator yoke and a first inner stator yoke are disposed inside and outside the rotor.
The rotor (4) according to claim 1, wherein the rotor (4) comprises a rotor (4) having a shorting ring coupled to both ends of a copper rod in a state that the copper rod is arranged in a toroidal cylindrical shape, And an outer stator (2) and a first inner stator (3a) yoke can be located on the inner side.
The yoke of claim 1 or 2, wherein the yoke of the outer stator (2) and the plurality of first and second inner stator (3a, 3b) yokes have toroidal cylindrical rotors (4) Wherein a magnetic field can be applied to the rotor (4) in a radial size different from that of the rotor (4).
A first inner stator 3a and a second stator 3a are provided in the yoke of the outer stator 2 and a second stator 2b is fixed to the inside of the yoke of the first inner stator 3a, The first and second rotors 4a and 4b are located on the outer circumferential surfaces of the yokes of the first and second inner stator 3a and 3b while the yoke is in a state in which the first and second inner stator 3a and 3b are located, The alternating-current motor having the yokes 3a and 3b and the rotating shafts 6 coupled to the centers of the first and second rotors 4a and 4b is connected to the yokes of the outer stator 2 and the first and second inner stator 3a and 3b Wherein a plurality of windings are connected in parallel so as to supply power to the inserted stator windings, and a selective power supply is enabled by a switch.
The alternating-current motor according to claim 4, wherein the alternating-current motor adjusts the speed of the alternating-current motor by changing the magnitude and the rotational frequency of the voltage by PWM (Pulse With Modulation), and the first, second and third winding switches (11a, 11b, And the power to be applied to the first and second rotors (4a, 4b) can be selectively changed by the control means (11c, 11c).

KR1020160031422A 2016-03-16 2016-03-16 The Ac motor with double atator structure and theof controlling method KR20170107727A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020160031422A KR20170107727A (en) 2016-03-16 2016-03-16 The Ac motor with double atator structure and theof controlling method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160031422A KR20170107727A (en) 2016-03-16 2016-03-16 The Ac motor with double atator structure and theof controlling method

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KR20170107727A true KR20170107727A (en) 2017-09-26

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KR1020160031422A KR20170107727A (en) 2016-03-16 2016-03-16 The Ac motor with double atator structure and theof controlling method

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