KR20100068848A - Constant-power brushless dc motor - Google Patents

Abstract

PURPOSE: A constant-power brushless DC motor altogether makes the look entire region of n without the dissimilarity which is the de-excitement the excitation. The electric motor efficiency is enhanced to maximum. CONSTITUTION: A stator is especially wound the aperture parallel. It buys the permanent magnet inside the laminated plate and the rotor(300) is formed. The sensor unit senses the phase of the rotor about stator. It is composed of the sensor board(604) in which the circular plate(602) and optical sensor(PA1~PE2) having the encoder(600) is the sensitive area(606) and non-sensing area is attached.

Description

Constant-power brushless dc motor {constant-power brushless dc motor}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless DC motor (hereinafter referred to as BLDC), and more particularly, to excite all n phase regions without non-exciting. The present invention relates to a constant-current output rectifier direct current motor that enables the use of hall sensors and resolvers as well as optical sensors.

In addition, the present invention by changing and applying the internal rotor structure of the structure that is combined with the holder on the non-magnetic hub by inserting and fixing a permanent magnet inside the laminated plate formed with a plurality of voids, the maximum efficiency of the motor to maximize The present invention relates to an output non-commutator DC motor.

In general, a conventional DC motor has a problem that the brush and the commutator is worn, the power type motor can not rotate at a high speed of more than 6,000rpm, the structure is complicated, and the cost is expensive, and AC inverter motor (AC) Invertor motor has a problem that the start torque (weak torque) is weak, the controller is expensive, and the constant-power does not become constant.

In addition, the magnetoresistance motor (Reluctance motor) is inferior to other motors in terms of cost, size and weight, the cost of the controller is also expensive, there is a problem that the unchanged output.

As described above, the conventional DC motor has limitations in cost and manufacturing, and a controller also requires four quadrant controls, which is expensive and does not have a constant power output.

On the other hand, the non-commutator DC motors (BLDC motors) do not have mechanical contacts like conventional brushed DC motors, so they do not generate noise and have a long service life. It is widely used as an electric motor for appliances.

Korean Patent Publication No. 10-415493 (published on Jan. 06, 2004) developed by the present applicant discloses a constant current output non-commutator DC motor capable of stabilizing output even under load fluctuations.

1 is a block diagram of the entire drive circuit for controlling the operation of the variable-voltage unchanged rectifier DC motor developed by the present applicant, Figure 2 is a rotor and rectification illustrated to explain the polarity control system of a 5-phase BLDC motor Figure 3a and 3b is an exploded perspective view and an assembled cross-sectional view showing an example of the variable-voltage unchanged rectifier DC motor (BLDC) of Figure 1, the encoder and power switching unit, Figures 4a and 4b and 5a and Figure 5b is a rotor structure applied to the BLDC, the inner rotor and the outer rotor in which the permanent magnet is radially inserted into the laminated plate, an illustration of the rotor in which the permanent magnet is inserted into the surface plate embedded in the laminated plate.

The BLDC motor drive system includes a direct current (DC) power supply unit 102, a power supply switching unit 104, a driving unit 106, an input unit 108, a PWM control unit 110, a speed control unit 112, It consists of a polarity control part 114 and a non-commutator direct current (BLDC) motor 120.

The DC power supply unit 102 converts the commercial AC power into DC and uses the battery or is implemented as a battery to provide the DC power supply (V +, V-) to the power switching unit 104, and the power switching unit 104 includes a driving unit ( The power semiconductor element (switching element) is turned on / off according to the driving signal of the 106 to transfer the power of the DC power supply unit 102 to the stator winding of the BLDC motor 120. Here, since the power switching unit 104 is for applying a DC power to the stator winding, the configuration may vary depending on the type of motor (that is, the constant of the stator winding). 2 shows a case in which the stator winding has five phases. In order to drive one phase, as shown in FIG. 2, four switching elements Q1 to Q4 are required. Since these are connected in an 'H' shape, they are referred to as 'H bridge', and the power switching unit 104 is used. Consists of a number of H bridges. As the switching device, transistors, IGBTs, MOSFETs, and FETs are widely used.

The input unit 108 provides a command signal for commanding the rotational speed of the motor by the operator's operation, and the PWM control unit 110 rotates the motor according to the command value of the input unit 108 and the control signal of the speed control unit 112. Generates a PWM signal to control the speed.

The speed controller 112 receives the control encoder signal from the BLDC motor 120 and provides the speed control signal to the PWM controller 110 during the closed loop control, and the polarity controller 114 receives the optical sensor from the BLDC motor 120. The signal is input to the driver 106, and the driver 106 receives the optical sensor signal of the polarity controller 114 and the PWM signal of the PWM controller 110 to control the switching element of the power switching unit 104. It provides a drive signal for.

BLDC motor 120 is designed by properly adjusting the number of poles of the stator and the number of rotors according to the requirements of the application, in Figure 2 the stator is five-phase, the number of rotor poles six poles (three N poles and three S pole) is illustrated. This electric motor 120 is a 2, 3, 4, 5, 6 .... n-phase multiphase type motor, and is excited 2, 3, 4, 5, .... a (<1a≤n-1 ) Phases and 2, 3, 4, 5, .... b (b = na) phases which are not excited, and are configured to alternately start and rotate one by one.

As shown in FIGS. 3A and 3B, the BLDC motor 120 includes a motor body 121 including a stator 125 and a rotor 126, and on the same shaft 127 as the rotor 126. It is composed of a rectifying encoder 122, and a control encoder 123 is connected.

The rectifying encoder 122 and the control encoder 123 are externally installed on one side of the shaft of the rotor outside the rear bracket of the main body and rotate together with the rotor 126. The rectifier encoder 122 includes a circular plate 502 having a sensing area and a non-sensing area, and a sensor board 504 provided with optical sensors PA1 to PE2, and the sensor plate 504 is an advanced rectifier ( Adjusted to an advanced commutation position, it is mounted on the circumference of the bracket.

The control encoder 123 is configured to dig a groove required for the annular plate so that the optical sensor can emit a pulse, the size and the split angle of the groove is appropriately adjusted according to the characteristics of the speed control or position control of the motor. Reference numeral 124 denotes a main body case.

The stator 125 is formed with a winding slot in a laminated plate of a silicon steel sheet, and a stator winding is wound in this slot. Each winding of five phases is wound independently in parallel.

The rotor is composed of permanent magnets as shown in FIGS. 4A and 4B or electromagnets although not illustrated in the figures.

4A illustrates an example in which a six-pole permanent magnet rotor includes an internal rotor 17, and the internal rotor 17 includes a bar type permanent magnet 171 having a plurality of voids 172 formed therein. The silicon steel sheet is inserted into and fixed in the laminated sheet 173, and the laminated sheet is configured in combination with a dove tail type holder 174 of a non-magnetic hub.

4B is an exemplary view in which the six-pole permanent magnet rotor is composed of an external rotor 27, and the external rotor 27 includes a permanent magnet 271, a void 272, a laminated plate 273, and a holder 274. Is made of.

As shown in FIG. 2, the commutator encoder 122 includes a circular plate 502 having a sensing area 506 and a non-sensing area and a sensor plate 504 to which the optical sensors PA1 to PE2 are attached. It consists of. The sensing area (concave portion: 506) and the non-sensing area (rest part) of the circular plate 504 are determined according to the stator constant and the number of rotor poles and the excitation constant, and the circular plate 504 is the axis 127 of the rotor. In the sensing area 506, the photo sensor is turned on to rotate, and the corresponding stator winding is excited. In the non-sensing area, the stator winding is turned off so that the stator winding is not excited. In particular, in the prior art, only a phase of the n phases is excited by properly adjusting the size of the sensing region.

Each phase has two photosensors (PA1, PA2; PB1, PB2; ..; PE1, PE2) and is configured to operate in conjunction with the rectifier encoder 122. One optical sensor of one phase and the other optical sensor are arranged in isolation on the pole spacing angle of the rotor, and each optical sensor of each phase is arranged in sequence on the gap angle of the phase. In this case, the n-phase 2n optical sensors sense the position of the rotor, and the detection signal of the optical sensor is transmitted to the power switching stage 104 to change the direction and interval of the current flowing through the stator winding. Instruct the motor to start and rotate.

On the other hand, the power switching unit 104 is composed of five full H bridge (full H bridge) to turn on / off the corresponding switching elements (Q ₁ ~ Q ₂₀ ) in accordance with the optical sensor signal of the rectifying encoder (122).

Referring to FIG. 2, the H bridge on A is a switching element (Q ₁ , Q ₄ ) turned on / off by a PA1 photosensor signal and a switching element (Q ₂ , Q ₃ ) turned on / off by a PA2 photosensor signal. The stator windings of phase A are connected therebetween. The H bridge on B is composed of switching elements Q ₅ and Q _{8 turned} on and off by the PB1 photosensor signal and switching elements Q ₆ and Q _{7 turned} on and off by the PB2 photosensor signal. The stator windings of phase B are connected, and the H bridges of phases C to E are connected in the same manner.

In the sensor plate 504 of the rectifying encoder, a pair of optical sensors PA1 and PA2 corresponding to the A phase are provided at predetermined intervals, and a pair of optical sensors PB1 and PB2 corresponding to the B phase are provided as PA1 and PA2. It is then installed, and in the same way the light sensors PC1, PD1, PE1, ... PC2, PD2, PE2 are connected. At this time, the pair of optical sensors are for sensing the pole of the rotor, when PA1 detects the rotor's N pole, PA2 is arranged to sense the rotor's S pole, and the optical sensors are arranged in the same manner Do not cause a pair of light sensors to be turned on at the same time. In particular, in the prior art, the excitation constant of n phases is equal to or less than n-1, and the position of the optical sensor is properly adjusted for advanced rectification so that the performance can be improved.

In FIG. 2, the case where three phases are excited among five phases is illustrated. That is, among the optical sensors that detect the N poles sequentially arranged as PA1 and PE1, the PA1, PB1, and PC1 optical sensors are turned on in the sensing region, so that the switching elements (Q ₁ , Q ₄ ) of the A-phase H bridge and the B-phase H bridge The switching elements Q ₅ and Q ₈ and the switching elements Q ₉ and Q ₁₂ of the C-phase H bridge are turned on and the remaining switching elements are turned off. Thus, current flows (ie, excitation) in the stator windings of phases A to C in the direction of the arrow.

On the other hand, in implementing the above-mentioned rectifying encoder 122, the number of optical sensors located in the sensing region 506, that is, the portion that recognizes light emission, is determined by the number of poles / 2 of the rotor. And the interval (angle of the axis) of the sensing area is determined by the following equation (1).

Equation 1

Spacing of sensing area (°) = (360 ° × constant to be excited) / (number of poles of rotor × constant of motor),

Therefore, in the illustrated five-phase six-pole motor, only three phases of the electric motor are configured, so the angle of the axis of the sensing area is 36 °.

For example, in FIG. 2, when one phase is excited, the optical sensor PA1 connected to the half H bridge switching elements Q₁ and Q₄ of one phase and the optical sensor PA2 connected to the other half H bridge switching elements Q2 and Q₃ of one phase ) Are installed in the same position on each other pole. Therefore, when the circuit is energized, the light sensor PA1 of the phase is located in the sensing area, so it transmits a positive (+) pulse, thereby turning on the Q₁ and Q₄ of the H bridge and energizing the stator winding. The corresponding stator winding, looped by Q₁ and Q₄, is excited.

On the other hand, while the rotor 126 is rotating, the interval at which the half H bridge Q 'and Q' are turned on is equal to the width of the sensing area of the rectifying encoder 122. That is, the interval at which the half H bridges of Q 'and Q' are excited is 36 degrees in axial angle. For the next axial angle of 24 ° (60 ° to 36 °), the light sensor PA1 and light sensor PA2 are also in the non-sensing area, so that Q₁, Q₄, Q₂, Q₃ of one phase H bridge are all off. ) State. Next, the optical sensor PA2 turns on Q 2 and Q 3 in accordance with the rotation of the rectifying encoder 122 like the optical sensor PA 1, and the phase is energized to independently start and rotate the rotor 126.

The installation interval (°) of the optical sensor on the sensor plate of Figure 2 is determined by the following equation (2).

Equation 2

Spacing (°) of each sensor = 360 ° / (number of poles of rotor x constant of motor)

Therefore, there are ten optical sensors in FIG. 2 and the installation interval is 12 °. The distance between the two light sensors in each phase is 360 ° / number of poles of the rotor. Therefore, the interval between the optical sensor PA1 and the optical sensor PA2 is 60 degrees.

In the five-phase six-pole motor shown in FIG. 2, the three phases are always excited, and the two phases are always in the non-excitation state. Therefore, the interval (electric angle) of each phase to be excited is determined by the following equation.

Equation 3

Electric angle to be excited (°) = 180 ° × (number of phases to be excited / number of motors to be excited)

And the interval of the non-excited each phase (electric angle) is determined by the following equation (4).

Equation 4

Unexcited Electrical Angle (°) = 180 ° × (Number of phases to be excited / number of motors)

Thus, the electrical angle that is excited in each phase of FIG. 2 is 108 ° and the electrical angle that is not excited is 72 °.

Fig. 6 illustrates the output pulses of the respective optical sensors of the five-phase six-pole motor, the input direction of the current and the spacing and the contour of the torque. According to the interval of the sensing region of the rectifying encoder 122, the current of the same interval as the pulse sent out by each optical sensor is supplied to the coil, and torque is generated. Thus, the current of the partial square wave is input, and the power of the square torque is output. Therefore, in FIG. 6, it can be seen that the 5-phase 6-pole electric motor is always excited in three phases and the two-phase is always in the non-excited state. Therefore, the sum of the torques is a linear torque scheme.

2 and 6, it can be seen that the design of how many phases the motor of the multiphase multipole is always excited is determined by how much the distance between the sensing regions of the rectifying encoder is set.

Therefore, BLDC motors are designed to solve all the problems occurring in the pole changing area and also require advanced commutation in order to facilitate high-speed rotation, so that the non-excitation phase of one or more of the polyphases is present. will be. Here, in a process in which the electric motor converts electrical energy into mechanical energy, energizing and energizing the coil of the stator, the active magnetic flux generates magnetic motive force and the passive magnetic flux of the rotating rotor at high speed. The timing of this action tends to cause the active magnetic flux to be delayed than the passive magnetic flux. Therefore, advanced rectification is required to meet this timing.

However, according to the conventional patent application by the present applicant as described above, the interval of the detection area so that a photosensor can detect so that a (1 <a ≤ n-1) of the n phases is excited Since a control method for determining the power consumption is used, one phase (1 <a) of the total n phases during the control of the DC motor remains in the non-excited state, thereby reducing the efficiency of the motor. .

Therefore, the present invention has been made to solve the problem of the variable-voltage unchanged rectifier DC motor synchronously developed by the present applicant, the technical problem to be solved by the present invention is a number of phases in n phases of the DC motor control By determining the distance between the detection zones of the rectifying encoder so that a sensor that excites (1≤a≤n) phases can be installed, all the n phase regions are filled without any non-exciting phases. Exciting is to provide a variable-voltage, no-commutator DC motor that enables the use of Hall sensors and resolvers, as well as optical sensors while maximizing the efficiency of the motor.

In addition, another technical problem to be solved by the present invention is to insert and fix the permanent magnet in the laminated plate of the silicon steel sheet formed with a plurality of voids and to change the rotor structure to the structure of the combination of the non-magnetic hub, the surface magnet type and The control method can be distinguished according to the buyer's stone type, and the variable-voltage outputless commutator DC motor can be applied to a wide range of permanent magnet attachment structures to the rotor of DC motors according to the parameters according to the correlation between torque and rotation ratio. It is to provide.

According to an embodiment of the present invention for achieving the above object, a stator composed of n multi-phase, the winding corresponding to each phase is connected to each of the n full H bridge and independently winding in parallel for each pole; A rotor having a number of poles necessary to concentrate the magnetic flux in the excitation region, the rotating shaft being positioned at the center thereof and rotating with respect to the stator by excitation of the winding; A rectifying encoder comprising a circular plate having a sensing area and a non-sensing area, and a sensor plate on which 2n sensors are installed, and mounted on one end of the shaft of the rotor; A DC motor comprising a sensor unit for sensing a phase of a rotor for the stator and generating a sensor signal for switching on / off switching elements of each half H bridge for the n full H bridges. The rectifier encoder is configured to configure a sensing area interval so that a sensor can sense a (1≤a≤n) phase among n phases, but a few of the n phases Whether to excite two images is determined according to the interval of the sensing region, the interval (axial angle) of the sensing region is determined by the following equation, and the number of sensing regions formed on the circular plate is the pole number / It is determined by 2, and the installation interval of each sensor on the sensor plate is determined by the following Equation 2, so as to excite all n phase regions without any non-excited phase.The non-modulated output of the non-commutator DC motor characterized in that price is determined, equal to the expressions (1) and equation (2).

(Equation 1)

Spacing of sensing area (°) = (360 ° × constant to be excited) / (number of poles of rotor × constant of motor)

(Equation 2)

Spacing of each optical sensor (°) = 360 ° / (number of poles of the rotor x constant of the motor)

According to another embodiment of the present invention for achieving the above object, the rotor is formed by continuously embedding a plurality of permanent magnets in the interior of the circumferential surface of the laminated plate of the silicon steel sheet formed with a plurality of voids, It is combined with the dovetail holder of the non-magnetic hub, and is a variable power output non-rectifier DC motor that is configured to rotate integrally with the shaft.

According to the present invention, all the phases of the n phases can be excited without controlling the non-exciting phase of the constant-current output rectifier DC motor, so that the efficiency of the motor can be maximized. There is an advantage to this.

In addition, according to the present invention, it is possible to detect the phase of the rotor with respect to the stator in the control of the constant-current output rectifier DC motor by using not only an optical sensor but also a hall sensor and a resolver. There is an advantage to this.

In addition, according to the present invention, by embedding the permanent magnet in the laminated plate of the silicon steel sheet to form a rotor, it is possible to control the DC motor according to the surface magnet type and embedded magnet type, and to control the correlation between the torque and the rotation ratio According to the parameter according to the there is an advantage such as to be able to apply a wide range of permanent magnet attachment structure to the rotor of the DC motor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the embodiments described below are not intended to limit the scope of the present invention but merely presented by way of example, and various modifications may be made without departing from the technical spirit of the present invention.

7 is a diagram illustrating a rotor, a rectifier encoder, and a full H bridge circuit exemplified for explaining the polarity control system of a constant current output no rectifier DC motor according to the present invention. The interval of the sensing region 606 of the rectifying encoder 600 is set so that a (1 ≦ a ≦ n) phases of the n phases are excited, and a sensor is mounted in the sensing region. How many phases of the n phases in the rectifying encoder 600 to excite is determined according to the interval of the sensing region, the interval (axial angle) of the sensing region is determined by the following equation (1).

(Equation 1)

Spacing of sensing area (°) = (360 ° × constant to be excited) / (number of poles of rotor × constant of motor)

In addition, the number of sensing regions formed on the circular plate 602 of the rectifying encoder 600 is determined by the number of poles / 2 of the rotor, and the installation interval of each sensor on the sensor plate 604 is expressed by Equation 2 below. Decide by

(Equation 2)

Spacing (°) of each sensor = 360 ° / (number of poles of rotor x constant of motor)

As a result, in the rectifying encoder 600 formed according to the present invention, the interval of the sensing region 606 may be determined so as to excite all n phase full regions without one unexcited phase.

As shown in FIG. 7, the rectifying encoder 600 includes a circular plate 602 having a sensing area 606 and a non-sensing area, and a sensor plate 604 to which the optical sensors PA1 to PE2 are attached. It is composed. Such optical sensors may be configured as any one of a Hall sensor or a resolver, which is a semiconductor sensor, and the following description will be given by exemplifying a case in which the optical sensor is attached.

The sensing area (606: concave) and the non-sensing area (rest) of the circular plate 602 are determined according to the stator constant and the number of rotor poles and the excitation constant. While rotating, the optical sensor is turned on in the sensing region 606 to excite the corresponding stator winding, and the optical sensor is turned off in the non-sensing region so that the stator winding is not excited. In particular, in the present invention, the size of the sensing region 606 is appropriately adjusted so that a phase (1 ≦ a ≦ n) of n images is excited.

Each phase has two optical sensors (PA1, PA2; PB1, PB2; ..; PE1, PE2) and is configured to operate in conjunction with the rectifier encoder (600). One optical sensor of one phase and the other optical sensor are arranged in isolation on the pole spacing angle of the rotor, and each optical sensor of each phase is arranged in sequence on the gap angle of the phase. In the case of n-phase, 2n optical sensors sense the position of the rotor, and the detection signal of the optical sensor is transmitted to the power switch to indicate the direction and interval of the current flowing through the stator winding to start and rotate the motor. Let's do it.

7, the full H-bridge of the A phase is switched to be on / off by the PA1 photosensor signal elements (Q _1, Q ₄₎ and PA2 switching elements to be on / off by the light sensor signal (Q _2, Q ₃ The stator windings of phase A are connected between them. In the same way, the full H bridges of phases B to E are connected.

In the sensor plate 604 of the rectifying encoder 600, a pair of optical sensors PA1 and PA2 corresponding to A phases are provided at predetermined intervals, and a pair of optical sensors PB1 and PB2 corresponding to B phases are provided. It is installed after PA1 and PA2, and the optical sensors PC1, PD1, PE1, ... PC2, PD2, PE2 are connected in the same way. At this time, the pair of optical sensors are for sensing the pole of the rotor, when PA1 detects the rotor's N pole, PA2 is arranged to sense the rotor's S pole, and the optical sensors are arranged in the same manner Do not cause a pair of light sensors to be turned on at the same time. Particularly, in the present invention, the number of a phases excited from n phases is 1 to n or less, and the motor efficiency can be maximized by appropriately adjusting the position of the optical sensor for advanced rectification.

In FIG. 7, a case in which a sensor is mounted such that five phases are excited among five phases is illustrated. That is, among the optical sensors that detect the N poles sequentially arranged as PA1 and PE1, the PA1, PB1, PC1, PD1, and PE1 optical sensors are turned on in the sensing region 606, so that the switching elements Q ₁ and Q of the A-phase full H bridge are turned on. ₄ ), switching elements of a full-phase B bridge (Q ₅ , Q ₈ ), switching elements of a full-phase H bridge (Q ₉ , Q ₁₂ ), switching elements of a full-phase D bridge (Q ₁₃ , Q ₁₆ ) , The switching elements Q ₁₇ and Q ₂₀ of the full E bridge H phase are turned on and the remaining switching elements are turned off. Thus, current flows (ie, excitation) in the stator windings of phases A to E in the direction of the arrow.

8A to 8E are cross-sectional views illustrating the structure of the permanent magnet embedded rotor applicable to the variable-voltage unchanged DC motor according to the present invention. The permanent magnet embedded rotor 300 includes silicon having a plurality of voids formed therein. It consists of a laminated plate 301 of the steel plate and a permanent magnet that is continuously embedded into the circumferential surface of the laminated plate, the laminated plate 301 is combined with the dovetail holder of the non-magnetic hub to be rotated integrally with the shaft It is composed.

As shown in FIGS. 8A to 8E, the permanent magnets embedded in the laminated plate 301 may include at least one pair of mating surfaces facing each other, the permanent magnets 302a having a curved surface, or one surface thereof as a curved surface. A permanent magnet 302b having a flat surface and the other surface facing the curved surface, or a flat permanent surface having two mating surfaces facing each other and having a pair of mating surfaces longer than the other pair of mating surfaces. Made of any one of the magnets 302c.

As described above, the permanent magnet 302a having a pair of corresponding surfaces is curved so that the curved surface is disposed in parallel with the circumferential surface of the laminate 301. In addition, the permanent magnet 302a having a pair of mating surfaces is continuously embedded such that the curved surfaces are arranged to intersect the circumferential surface of the laminate 301, as shown in FIG. 8B, in which case at least two The permanent magnets 302a may be disposed to overlap each other, and may be embedded to overlap each other in the radial direction of the laminate 301. 8B illustrates a case where three permanent magnets 302a are overlapped.

In addition, the permanent magnet 302b having one surface formed of a curved surface and the other surface facing the curved surface is formed such that the curved surface thereof is disposed in parallel with the circumferential surface of the laminate 301 as shown in FIG. 8C. Are continuously purchased.

In addition, both of the mating surfaces facing each other are formed in a plane and a pair of mating surfaces are longer than the other pairs of pairs of plate-shaped permanent magnets 302c, as shown in Figure 8d, the circle of the laminated plate 301 It is continuously embedded into the main surface, or as shown in Figure 8e, is formed by embedding another plurality of flat permanent magnet radially so as to be located between the embedded flat permanent magnet and the circumferential surface of the laminate.

According to the present invention, since the distance between the detection areas that can be sensed by the a light sensor is determined so that a (1≤a≤n) of the n phases is excited, it is possible It is possible to excite all the phases without the phases that are not excited even if the three phases can be controlled at the maximum inflection point of the pole change point, thus increasing the power density to implement a high efficiency motor.

In addition, according to the present invention, it is possible to cover the n phase of the entire area, as well as the use of optical sensors as well as hall sensors, resolvers, etc. can be extended to the sensor application range, and bar type permanent magnet In addition, since the permanent magnets of various types such as flat type and tile type can be inserted and fixed in the laminated sheet of silicon steel sheet having a large number of voids, the internal rotor structure is combined with a dove tail type holder. (Spoke type) has an advantage such that it can be extended to apply.

FIG. 1 is a block diagram of an entire driving circuit for controlling the operation of a general non-variable output DC motor.

FIG. 2 is a circuit diagram illustrating a rotor, a rectifier encoder, and a full H bridge, which is a power switching unit thereof, for explaining the polarity control system of the BLDC DC motor of FIG. 1.

3A and 3B are an exploded perspective view and an assembled sectional view illustrating an example of the variable-voltage unchanged rectifier DC motor (BLDC) of FIG. 1.

4A and 4B are exemplified diagrams of an internal rotor and an external rotor in which a permanent magnet is radially inserted into a laminate as a rotor structure applied to a BLDC.

5A and 5B illustrate another rotor structure applied to a BLDC, in which a permanent magnet is inserted into a laminate in a surface-embedded form.

6 is a schematic diagram of torque output when three phases are excited in a conventional five-phase six-pole BLDC motor.

7 is a circuit diagram illustrating a rotor, a rectifier encoder, and a full H bridge exemplified for explaining the polarity control system of the variable-voltage unchanged rectifier five-phase DC motor according to the present invention.

8A to 8E are exemplary diagrams of the rotor structure of the variable-voltage unchanged rectifier five-phase DC motor according to the present invention.

<Description of the symbols for the main parts of the drawings>

300: permanent magnet embedded rotor 301: laminated plate

302a, 302b, 302c: permanent magnet 600: commutation encoder

602: circular plate 604: sensor plate

606: detection area

Claims (10)

a stator composed of n polyphases, the winding corresponding to each phase being connected to each of n full H bridges, and having a parallel winding independently for each pole; A rotor having a number of poles necessary to concentrate the magnetic flux in the excitation region, the rotating shaft being positioned at the center thereof and rotating with respect to the stator by excitation of the plurality of winding coils; A rectifying encoder comprising a circular plate having a sensing area and a non-sensing area, and a sensor plate on which 2n sensors are mounted, and mounted on one end of the shaft of the rotor; Comprising 2n sensors, the direct current motor having a sensor unit for detecting the phase of the rotor for the stator to generate a sensor signal for switching on / off the switching elements of each half H bridge for the n full H bridge , The rectifier encoder is configured to configure the interval of the detection area so that a sensor can be detected so that a (1≤a≤n) phase of n phases, How many phases of the n phases is to be excited is determined according to the interval of the sensing region, and the interval (axis angle) of the sensing region is determined by the following Equation 1, The number of sensing areas formed on the circular plate is determined by the number of poles / 2 of the rotor, The installation interval of each sensor on the sensor plate is determined by the following equation (2), A constant-power output rectifier DC motor, characterized in that the interval of the detection area of the rectifier encoder is determined so that all of the n phase areas can be excited without any phase that is not excited. (Equation 1) Spacing of sensing area (°) = (360 ° × constant to be excited) / (number of poles of rotor × constant of motor), (Equation 2) Spacing (°) of each sensor = 360 ° / (number of poles of rotor x constant of motor) The method of claim 1, wherein the rotor, Formed by continuously embedding a plurality of permanent magnets into the inner circumferential surface of the laminated plate of the silicon steel sheet formed with a plurality of voids, the laminated plate is configured to be combined with the dovetail holder of the non-magnetic hub to be rotated integrally with the shaft Variable voltage outputless rectifier DC motor, characterized in that the. The method of claim 2, wherein the rotor, At least one pair of mating surfaces facing each other inside the laminated plate is formed by embedding a permanent magnet made of a curved surface, characterized in that the variable-output non-commutator DC motor. The method of claim 2, wherein the rotor, And a permanent magnet formed by embedding the permanent magnet such that the curved surface of the permanent magnet is disposed in parallel with the circumferential surface of the laminate. The method of claim 2, wherein the rotor, And a permanent magnet formed by embedding the permanent magnet such that the curved surface of the permanent magnet intersects the circumferential surface of the laminate. The method of claim 5, wherein the rotor, A constant-voltage output non-commutator DC motor, characterized in that formed by embedding a plurality of permanent magnets overlapping in the radial direction of the laminate. The method of claim 2, wherein the rotor, In the laminated plate, one side is made of a curved surface, the other side facing the curved surface is formed by embedding a permanent magnet made of a permanent magnet, characterized in that the non-output rectifier DC motor. The method of claim 2, wherein the rotor, A constant current output rectifier DC motor, characterized in that formed by embedding a plate-shaped permanent magnet in the laminated plate. The method of claim 8, wherein the rotor, Inside the laminate, a plurality of flat permanent magnets are continuously embedded in the circumferential surface, and another plurality of flat permanent magnets are radially positioned so as to be located between the embedded flat permanent magnet and the circumferential surface of the laminated plate. A constant current output, no rectifier DC motor, characterized in that formed by embedding. The sensor unit according to any one of claims 1 to 9, wherein Non-changing output rectifier DC motor, characterized in that any one of the Hall sensor, optical sensor, resolver.

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