CN108075696A - Motor and motor-drive circuit - Google Patents
Motor and motor-drive circuit Download PDFInfo
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- CN108075696A CN108075696A CN201611036649.4A CN201611036649A CN108075696A CN 108075696 A CN108075696 A CN 108075696A CN 201611036649 A CN201611036649 A CN 201611036649A CN 108075696 A CN108075696 A CN 108075696A
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Abstract
The present invention provides a kind of motor and its driving circuit, and the driving circuit includes controllable bidirectional alternating-current switch, first and second detection circuit, steering controling circuit and ON-OFF control circuit；Controllable bidirectional alternating-current switch is connected to the both ends of AC power with stator winding；First and second detection circuit is used to detect the position of magnetic pole of p-m rotor, and exports position of magnetic pole signal in its output terminal；Steering controling circuit turns to the setting position of magnetic pole signal that selectively output first or second detection circuit exports to the ON-OFF control circuit according to motor；ON-OFF control circuit controls the conducting state of the controllable bidirectional alternating-current switch to control motor positive and inverse according to the signal of steering controling circuit output and the polarity information of the AC power.Motor-drive circuit of the present invention is simple in structure, and versatility is good.
Description
Technical field
The present invention relates to Motor Control Field more particularly to motors and motor-drive circuit.
Background technology
Motor refers to a kind of calutron that conversion or the transmission of electric energy are realized according to the law of electromagnetic induction.Its main work
With being to generate driving torque, as electrical appliance or the power source of various machineries.Electric machine because it is easy to operate, control it is convenient
It is widely used in various electric equipment products.But the positive and reverse rotation control circuit of some motors is complicated currently on the market.
The content of the invention
In view of this, it is necessary to which a kind of motor driving electricity of control motor positive and inverse simple in structure, easy to operate is provided
Road and the motor with the motor-drive circuit.
The embodiment of the present invention provides a kind of motor-drive circuit, for driving motor rotor compared with stator rotation,
The motor-drive circuit includes：
Controllable bidirectional alternating-current switch is connected to the both ends of AC power with the winding of motor；
First and second detection circuit is respectively used to detect the position of magnetic pole of the rotor, first and second described detection
When circuit detects rotor same pole, the opposite position of magnetic pole signal of output phase；
Steering controling circuit connects first and second described detection circuit, is configured as being set according to the steering of motor and select
The position of magnetic pole signal for exporting the first detection circuit to selecting property or the position of magnetic pole signal output for exporting the second detection circuit
To an ON-OFF control circuit；
The ON-OFF control circuit is configured as the polarity letter according to the position of magnetic pole signal and the AC power received
Breath, control the conducting state of the controllable bidirectional alternating-current switch with control motor with specific direction rotate or with the certain party
It rotates in the opposite direction.
As a preferred embodiment, it is positive half cycle and described that the ON-OFF control circuit, which is configured as in the AC power,
When steering controling circuit exports the first signal or the AC power is negative half period and the second letter of steering controling circuit output
Number when turn on the controllable bidirectional alternating-current switch.
As a preferred embodiment, when motor is rotated with specific direction, the steering controling circuit is by the first detection circuit
The position of magnetic pole signal output of output is to the ON-OFF control circuit；Motor to rotate in the opposite direction with the certain party
When, the steering controling circuit is by the position of magnetic pole signal output that the second detection circuit exports to the ON-OFF control circuit.
As a preferred embodiment, first detection circuit includes the first Hall sensor；Second detection circuit
Including the second Hall sensor, the Hall thin slice in second Hall sensor is towards the direction of the rotor compared with described
Hall thin slice in first Hall sensor is overturn towards the direction of the rotor in 180 degree.
As a preferred embodiment, in motor resting position, first Hall sensor and the second Hall sensor are equal
The N poles of the neighbouring rotor are set or first Hall sensor is adjacent to the N poles of the rotor, and second Hall passes
Sensor is adjacent to the S poles of the rotor.
As a preferred embodiment, the steering controling circuit include switch unit, the switch unit include first to
3rd end, the first end connect the ON-OFF control circuit, and the second end receives the magnetic of the first detection circuit output
Pole position signal, the 3rd end receive the position of magnetic pole signal of the second detection circuit output, and the first end is according to electricity
The steering setting of machine is selectively connected the second end or the 3rd end, when the first end connects the second end, motor with
Specific direction rotates；When the first end connects three end, the motor to rotate in the opposite direction with certain party.
As a preferred embodiment, the switch unit of the steering controling circuit further includes the 4th end, and the 4th end is empty
It connects, when motor rotates during pre-switch direction of motor rotation, the first end, which first connects one preset time of the 4th end, to be made to turn
Son stops at predetermined at rest position, and the first end reconnects terminal corresponding with pre-switch direction.
As a preferred embodiment, the motor-drive circuit further include at least to first Hall sensor and
Second Hall sensor provides the rectifier of DC voltage, and the rectifier includes output the first output terminal of high voltage and defeated
Go out the second output terminal of low voltage, the power end of first and second Hall sensor connects first output terminal, institute
The ground terminal for stating first and second Hall sensor connects the second output terminal.
As a preferred embodiment, the motor-drive circuit further includes the reducing transformer being connected with the rectifier, is used for
The rectifier is inputed to after AC supply voltage is depressured again, the ON-OFF control circuit includes first resistor, tri- poles of NPN
Pipe and the second resistance and diode being series between steering controling circuit and the controllable bidirectional alternating-current switch；Described two
The cathode of pole pipe connects the steering controling circuit；Described first resistor one end connects the first output terminal of the rectifier, separately
One end connects the cathode of the diode；The base stage of the NPN triode connects the cathode of the diode, emitter connection institute
The anode of diode is stated, collector connects the first output terminal of the rectifier.
As a preferred embodiment, the motor-drive circuit further includes control switch, and the control switch is connected to
Between the AC power and machine winding, pre-switch motor steering during motor operation is first turned off institute before switch motor steering
Control one predetermined time of switch is stated, until the rotor is parked in predetermined at rest position.
The embodiment of the present invention also provides a kind of motor-drive circuit, turns for the rotor of driving motor compared with stator
Dynamic, the motor-drive circuit includes：
Controllable bidirectional alternating-current switch, the controllable bidirectional alternating-current switch are connected between first and second node, motor around
Group and an external ac power source are series between first, second node；Or the controllable bidirectional alternating-current switch and machine winding
It is series between first and second node, external ac power source is connected between first and second node；
With first and second mutually isostructural motor driving integrated circuit, the integrated electricity of first and second motor driving
Road includes housing, and the housing includes antetheca and rear wall, and the antetheca of first motor driving integrated circuit is towards described turn
Son, the rear wall of second motor driving integrated circuit is towards the rotor, the first, second motor driving integrated circuit bag
It includes：
Detection circuit for detecting the position of magnetic pole of the rotor, and exports position of magnetic pole signal in its output terminal；
ON-OFF control circuit is configured as the position of magnetic pole signal according to detection circuit output and the AC power
Polarity output control signal；
Steering controling circuit is configured as being set according to the steering of motor, selectively drives first or second motor
The control signal of integrated circuit output is exported to the controllable bidirectional alternating-current switch, to control the controllable bidirectional alternating-current switch
Conducting state makes motor be rotated with specific direction or to be rotated in the opposite direction with the certain party.
The embodiment of the present invention also provides a kind of motor, and including stator, rotor and as above any one of them motor drives
Circuit.
As a preferred embodiment, the motor is single-phase permanent alternating current generator, single-phase permanent-magnet synchronous motor or single-phase
Permanent magnetism BLDC motors.
Motor-drive circuit provided in an embodiment of the present invention passes through two detection circuits or two motor driving integrated circuits
The position of magnetic pole of rotor is detected, described two detection circuits or two motor driving integrated circuits detect rotor same pole
When, the opposite position of magnetic pole signal of output phase, steering controling circuit is according to the corresponding detection electricity of the steering of motor setting selection
The state of the position of magnetic pole signal or control signal control controllable bidirectional alternating-current switch of road or motor driving integrated circuit output, into
And the current direction for flowing through motor stator winding is controlled, to control the forward or reverse of motor.The motor-drive circuit structure
Simply, it is versatile.
Description of the drawings
In attached drawing：
Fig. 1 shows the circuit diagram of the motor of first embodiment of the invention.
Fig. 2 shows an embodiment of the first Hall sensor and the second Hall sensor relative rotor position in Fig. 1
Schematic diagram.
Fig. 3 shows another embodiment of the first Hall sensor and the second Hall sensor relative rotor position in Fig. 1
Schematic diagram.
Fig. 4 shows the fundamental diagram of Hall sensor.
Fig. 5 shows the circuit diagram of an embodiment of steering controling circuit.
Fig. 6 shows the circuit diagram of the motor of second embodiment of the invention.
Fig. 7 shows the circuit diagram of the motor of third embodiment of the invention.
Fig. 8 shows the circuit diagram of the motor of fourth embodiment of the invention.
Fig. 9 shows the circuit diagram of the motor of fifth embodiment of the invention.
Figure 10 A and Figure 10 B show the power input to machine of prior art motor input power and embodiment of the present invention
Comparison diagram.
Main element symbol description
Following specific embodiment will be further illustrated the present invention with reference to above-mentioned attached drawing.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment belongs to the scope of protection of the invention.It is appreciated that attached drawing is only provided with reference to illustrating to use, not it is used for this hair
It is bright to be any limitation as.The connection shown in attached drawing does not limit connection mode only for ease of clearly describing.
It should be noted that when a component is considered as " connection " another component, it can be directly to separately
One component may be simultaneously present component placed in the middle.Unless otherwise defined, all technologies used herein and section are academic
Language has the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.Herein in the description of the invention
Used term is intended merely to the purpose of description specific embodiment, it is not intended that in the limitation present invention.
It please refers to Fig.1 and Fig. 2, the circuit diagram of the motor 10 of first embodiment of the invention is shown, the motor 10 can
Bidirectional rotation.The motor 10 include stator and can relative stator rotation rotor 11.Stator has stator core and is set around
Stator winding 16 in stator core.Stator core can be by the soft magnetisms material such as pure iron, cast iron, cast steel, electrical sheet, silicon steel, ferrite
Material is made.Rotor 11 be p-m rotor, when stator winding 16 is connected with an AC power 24 rotor 11 in steady-state process with 60f/p
The rotating speed constant-speed operation of circle/minute, wherein f are the frequencies of the AC power, and p is the number of pole-pairs of rotor.It is fixed in the present embodiment
Sub- iron core has two opposite pole portions (not shown).Each pole portion has polar arc face, and the outer surface of rotor is opposite with polar arc face, and two
Substantially uniform air gap is formed between person.Substantially homogeneous air gap alleged by the application refers to largely be formed between stator and rotor
Even air gap, only fewer parts are non-homogeneous air gap.Preferably, the starting slot of indent, pole are set on the polar arc face in stator poles portion
Part in cambered surface in addition to slot is started is then concentric with rotor 11.Above-mentioned configuration can form non-uniform magnetic field, and motor 10 is allowed to exist
Rotor 11 can have starting torque when being powered every time under the action of one motor-drive circuit 19.In the present embodiment, stator and turn
Son 11 is respectively provided with two magnetic poles.It should be understood that in more embodiments, the number of magnetic poles of stator and rotor can not also be equal,
And with more magnetic poles, such as four, six etc..
The stator winding 16 and motor-drive circuit 19 of motor 10 are series at 24 both ends of AC power.The motor driving electricity
Road 19 can control the rotating of motor.The AC power 24 can be 220 volts, 230 volts etc. of mains AC or inversion
The alternating current of device output.
The motor-drive circuit 19 includes the first detection circuit, the second detection circuit, rectifier, controllable bidirectional and exchanges and open
Close 26, ON-OFF control circuit 30 and steering controling circuit 50.Controllable bidirectional alternating-current switch 26 is connected to the sections of first node A and second
Between point B, motor stator winding 16 and AC power 24 are connected between first node A and section point B.The rectifier
First input end I1 by a resistance R0 connection first node A, the second input terminal I2 connection section point B of the rectifier,
The rectifier is used to that AC power to be converted to direct current and supplies first detection circuit and the second detection circuit.
In other embodiment, the stator winding 16 is series at the first segment with the controllable bidirectional alternating-current switch 26
Between point A and section point B, the external ac power source 24 is connected between first node A and section point B.
First detection circuit, the second detection circuit detect the position of magnetic pole of rotor 11 respectively, and in its output
End exports corresponding position of magnetic pole signal, such as 5V or 0V.First detection circuit and the second detection circuit are preferably suddenly
Such as linear hall sensor or Hall switch sensor, the first hall sensing is denoted as in this embodiment respectively for your sensor
22 and second Hall sensor 23 of device.In certain other embodiment, first and second described detection circuit can also be photoelectricity
Encoder.First Hall sensor, 22 and second Hall sensor 23 includes power end VCC, ground terminal GND and output
Hold H1.In present embodiment, the same polarity of 22 and second Hall sensor 23 of the first Hall sensor sensing rotor 11
Magnetic pole when, the opposite position of magnetic pole signal of output phase.
The structure of first Hall sensor, 22 and second Hall sensor 23 is identical, is integrated circuit, including shell
Body, the housing include antetheca and rear wall, have wafer, that is, Hall thin slice (hall plate) 220 and signal in housing
Amplifier 222 (please refers to Fig.4).When being applied particularly to the motor 10, the antetheca of first Hall sensor 22 is towards institute
State rotor 11, the rear wall of second Hall sensor 23 is towards the rotor 11.In motor resting position, first Hall
Sensor 22 is had angle with being set compared with the 11 pole axis R counterclockwise bias of rotor with shape；Second Hall sensor
23 are had angle with biasing to set clockwise compared with the 11 pole axis R of rotor with shape, in present embodiment, two angle phases
Deng being denoted as α.By the void at diametrically opposite two opposing polarities (being two blocks of magnet in the present embodiment) center of rotor 11
Intend the pole axis R that line is denoted as rotor.In the embodiment shown in Figure 2,22 and second hall sensing of the first Hall sensor
The same magnetic pole of 23 equal adjacent rotor 11 of device, as the arctic (North, N pole) is set.In other embodiment, as shown in figure 3, the
The different magnetic poles of 23 adjacent rotor 11 of one Hall sensor 22 and the second Hall sensor are set, and such as the first Hall sensor 22 is adjacent
The N poles of nearly rotor are set, and second Hall sensor 23 is set adjacent to the South Pole of the rotor 11 (South, S pole).Ability
It is several to magnetic pole that field technique personnel are appreciated that the rotor 11 may include, the electrical angle of the angle is less than 90 degree/N, and N is
The logarithm of the rotor magnetic pole.In present embodiment, the scope of the angle α is more than or equal to 0 degree and less than 90/N degree, i.e.
The angle α is more than or equal to 0 degree, less than 45 degree.Preferably, the angle can be 0 degree, 15 degree, 20 degree, 25 degree, 30 degree, 35
Degree or 40 degree.When first and second described Hall sensor 22,23 are set, in the predetermined resting position of rotor, described first and
Second zero crossing region of the Hall sensor 22,23 away from the rotor field, the i.e. most weak region in rotor field, so that rotor
It can smoothly start.
The steering controling circuit 50 connects 22 and second Hall sensor 23 of the first Hall sensor, is configured as
The position of magnetic pole signal for selectively exporting the first Hall sensor 22 is set according to the steering of motor or passes the second Hall
The position of magnetic pole signal output that sensor 23 exports is to the ON-OFF control circuit 30.The ON-OFF control circuit 30 is according to reception
The polarity information of position of magnetic pole signal and the AC power controls the controllable bidirectional alternating-current switch 26 leading in a predefined manner
It is logical to switch between cut-off state, to control the forward or reverse of motor.
The rectifier includes four diode D2-D5.The anode of the cathode of the diode D2 and the diode D3
It is connected, the cathode of the diode D3 is connected with the cathode of the diode D4, the anode of the diode D4 and two pole
The cathode of pipe D5 is connected, and the anode of the diode D5 is connected with the anode of the diode D2.The cathode of the diode D2
First input end I1 as the rectifier is connected through a resistance R0 with the first node A.The resistance R0 can be used as drop
Depressor.The anode of the diode D4 is connected as the second input terminal I2 of the rectifier with the section point B.Described two
The cathode of pole pipe D3 is as the first output terminal O1 of the rectifier and first Hall sensor 22, the second Hall sensor
23 power end VCC is connected, and the first output terminal O1 exports higher direct-current working volts.The anode of the diode D5 is made
For the ground terminal GND phases of the second output terminal O2 and the first Hall sensor 22 and the second Hall sensor 23 of the rectifier
Even, the second output terminal O2 outputs are less than the low voltage of first output end voltage.First output of the rectifier
The anode connection described second that zener diode a Z1, the zener diode Z1 is connected between the O1 and second output terminal O2 of end is defeated
The cathode of outlet O2, the zener diode Z1 connect the first output terminal O1.
In present embodiment, described in the output terminal H1 connections of 22 and second Hall sensor 23 of the first Hall sensor
Steering controling circuit 50.In the case that first Hall sensor 22 is by normal power supply, i.e. power end VCC receives higher electricity
Pressure, ground terminal GND receive low voltage, if the rotor field of detection is N poles, output terminal H1 exports the magnetic of logic high
Pole position signal, if detecting S poles, output terminal H1 exports the position of magnetic pole signal of logic low.Second Hall
In the case that sensor 23 is by normal power supply, i.e. power end VCC receives high voltage, and ground terminal GND receives low voltage, if
The rotor field of detection is N poles, and output terminal H1 exports the position of magnetic pole signal of logic low, defeated if detecting S poles
Outlet H1 exports the position of magnetic pole signal of logic high.
Same polarity poles output phase now is detected to 22 and second Hall sensor 23 of the first Hall sensor
The principle of opposite position of magnetic pole signal is described.Please also refer to Fig. 4, the Hall thin slice 220 includes antetheca X and rear wall
Y, when Hall thin slice 220 is encapsulated into the housing of the Hall sensor, the antetheca X corresponds to the Hall sensor package
Antetheca, the rear wall corresponds to the rear wall of the Hall sensor package.The Hall thin slice 220 further includes two exciting currents
M, N (the power end VCC and ground terminal GND in corresponding diagram 1 respectively), two hall electromotive force output terminals C, D are held, the signal is put
Two input terminals of big device 222 connect two hall electromotive force output terminals C, D respectively.Now with first and second Hall sensor
22nd, 23 N extremely examples are sensed illustrate.Because the antetheca of the first Hall sensor 22 is towards the rotor 11, senses and turn
When the magnetic pole of son 11 is N poles, the Hall thin slice 220 of first Hall sensor 22 is placed in the magnetic field that magnetic induction intensity is B,
Magnetic direction is from bottom to top perpendicular to Hall thin slice 220, as shown in figure 4, after magnetic direction is directed toward by 220 antetheca X of Hall thin slice
Wall Y.When having, when flowing to the electric current of exciting current end N from exciting current end M and flowing through Hall thin slice 220, electronics is subject to Lorentz force
It acting on and deflects, electronics is accumulated on hall electromotive force output terminal C, and hall electromotive force output terminal D lacks electronics, because
This hall electromotive force output terminal C is negatively charged, hall electromotive force output terminal D positively chargeds, on the direction of electric current and magnetic field
Hall electromotive force will be generated between hall electromotive force output terminal C, D, the signal amplifier 222 puts the hall electromotive force
Greatly and the position of magnetic pole signal of digital signal form is generated, at this point, the position of magnetic pole signal is logic high " 1 ", from suddenly
The output terminal H1 outputs of your sensor.Because the rear wall of the second Hall sensor 23 is towards the rotor 11, the magnetic of rotor is sensed
Extremely N poles when, the Hall thin slice 220 of second Hall sensor 23 is placed in the magnetic field that magnetic induction intensity is B, magnetic direction
From top to bottom perpendicular to Hall thin slice 220, since the second Hall sensor 23 is turned over compared with the first Hall sensor 22
Turn, be directed toward antetheca X from magnetic direction from the point of view of the second Hall sensor 23 by the rear wall Y of Hall thin slice 220, magnetic field is through suddenly
Direction in the direction and Fig. 4 of your thin slice 220 is exactly the opposite.When there is electric current stream that exciting current end N is flowed to from exciting current end M
When crossing Hall thin slice 220, electronics is accumulated on hall electromotive force output terminal D, and hall electromotive force output terminal C lacks electronics,
Therefore hall electromotive force output terminal D is negatively charged, hall electromotive force output terminal C positively chargeds, perpendicular to the direction of electric current and magnetic field
Upper that hall electromotive force will be generated between hall electromotive force output terminal C, D, the signal amplifier 222 carries out the hall electromotive force
Amplify and generate the position of magnetic pole signal of digital signal form, the position of magnetic pole signal is logic low " 0 " at this time, from suddenly
The output terminal H1 outputs of your sensor.When the first Hall sensor 22 and the second Hall sensor 23 sense the S poles of rotor,
The output terminal H1 output logic lows of first Hall sensor 22, the output terminal H1 outputs of second Hall sensor 23 are patrolled
High level is collected, principle is similar with above-mentioned principle, repeats no more.
To sum up, the first Hall sensor 22 with front face to the rotor, the second Hall sensor 23 with rear surface to institute
The form for stating rotor is installed on motor, makes Hall thin slice in second Hall sensor 23 towards the side of the rotor 11
It is overturn to compared with the Hall thin slice in first Hall sensor 22 towards the direction of the rotor 11 in 180 degree, when the
One and second Hall sensor 22,23 when sensing the magnetic pole of same polarity of rotor 11, the opposite position of magnetic pole of output phase
Signal.
It refer again to Fig. 1, the steering controling circuit 50 includes a switch unit, and the switch unit includes first to the
Three end 51-53, the first end 51 connect the ON-OFF control circuit 30, and the second end 52 receives first hall sensing
The position of magnetic pole signal that device 22 exports, the 3rd end 53 receive the position of magnetic pole letter that second Hall sensor 23 exports
Number, the first end 51 is selectively connected described second by the steering controling circuit 50 according to a steering setting signal CTRL
52 or the 3rd end 53 of end.
The ON-OFF control circuit 30 includes first to third terminal, and wherein first terminal connects the first of the rectifier
Output terminal O1, Second terminal connect the first end 51 of the steering controling circuit 50, and third terminal connects the controllable bidirectional and hands over
The control pole G of stream switch 26.The ON-OFF control circuit 30 includes resistance R2, NPN triode Q1 and is series at course changing control
Diode D1 and resistance R1 between the first end 51 of circuit 50 and the controllable bidirectional alternating-current switch 26.The diode D1's
Cathode connects the first end 51 of the steering controling circuit 50 as the Second terminal of the ON-OFF control circuit 30.The resistance
R2 one end connects the first output terminal O1 of the rectifier 28, and the other end connects the cathode of the diode D1.Tri- poles of NPN
The base stage of pipe Q1 connects the cathode of the diode D1, and emitter connects the anode of the diode D1, described in collector is used as
The first terminal of ON-OFF control circuit 30 connect the first output terminal O1, the resistance R1 of the rectifier 28 not with two pole
Third terminal of the one end that pipe D1 is connected as the ON-OFF control circuit 30.
The controllable bidirectional alternating-current switch 26 preferably three terminal bidirectional thyristor (TRIAC), first anode T1 connections
Section point B, second plate T2 connection first node A, the third terminal of the control pole G connections ON-OFF control circuit 30.
It is appreciated that the controllable bidirectional alternating-current switch 26 may include by mos field effect transistor, silicon-controlled whole
It flows in device, three terminal bidirectional thyristor, insulated gate bipolar transistor, bipolar junction transistor, thyristor, optic coupling element
One or more composition can allow the two-way electronic switch flowed through of electric current.For example, two metal oxide semiconductor field-effect crystalline substances
Body pipe can form controllable bidirectional alternating-current switch；Two silicon controlled rectifier (SCR)s can form controllable bidirectional alternating-current switch；Two insulated gates
Bipolar transistor can form controllable bidirectional alternating-current switch；Two bipolar junction transistors can form controllable bidirectional alternating-current switch.
The ON-OFF control circuit 30 is configured as receiving first in the AC power for positive half cycle and its Second terminal
During level or when the AC power is negative half period and its Second terminal reception second electrical level, exchange the controllable bidirectional
26 conducting of switch；When the AC power receives the first level for negative half period and its Second terminal or the AC power
When receiving second electrical level for positive half cycle and its Second terminal, the controllable bidirectional alternating-current switch 26 is not turned on.Preferably, described
One level is logic high, and the second electrical level is logic low.
Now the operation principle of 19 control pole motor positive and inverse of motor-drive circuit is described.
According to electromagnetic theory, for electric machine, it can be changed by the step mode for changing stator winding 16
Become the steering of rotor.If the rotor polarity that Hall sensor senses is N poles, the AC power of stator winding 16 is flowed through
For positive half cycle, motor reversal is rotated such as (CCW) counterclockwise；It is appreciated that if the rotor polarity that Hall sensor senses is still
For N poles, make to flow through the external ac power source of stator winding 16 for negative half period, rotor will be rotated forward such as (CW) clockwise rotation
Turn.Embodiments of the present invention are designed according to this principle, i.e., the rotor sensed according to first, second Hall sensor 22,23
Polarity adjustment flow through the control that is rotated and reverse to motor of current direction realization of stator winding 16.In present embodiment, institute
State the first Hall sensor 22 and when the second Hall sensor 23 senses the same magnetic pole of rotor, the opposite magnetic of output phase
Pole position signal, ON-OFF control circuit 30 flow through the pole of the external ac power source of stator winding 16 according to the control of position of magnetic pole signal
Property, you can control the steering of motor.
Table 1 shows the menu according to the rotating for turning to setting signal CTRL control motors.
Table 1
| Turn to setting signal CTRL | The detection circuit of selection | Motor steering |
| 0 | First Hall sensor | Counterclockwise |
| 1 | Second Hall sensor | Clockwise |
It is now illustrated so that motor rotates forward as an example, it is assumed that the steering setting signal CTRL output logic highs " 1 ", institute
The first end 51 for stating steering controling circuit 50 is connected with the 3rd end 53, and the ON-OFF control circuit 30 receives second Hall and passes
The position of magnetic pole signal that sensor 23 exports.During electric motor starting, if the second Hall sensor 23 senses the position of magnetic pole of rotor
For N poles, the position of magnetic pole signal of the second Hall sensor 23 output logic low " 0 ", the two of the ON-OFF control circuit 30
The cathode of pole pipe D1 receives low level, and the triode Q1 is turned off, if AC power is in negative half period during the electric motor starting,
AC power in negative half period flows through control pole G, resistance R1 and diode the D1 ground connection of the controllable bidirectional alternating-current switch 26,
The controllable bidirectional alternating-current switch 26 turns on, and the rotor 11 starts rotation clockwise.If alternating current during the electric motor starting
Source is in positive half cycle, and the AC power in positive half cycle can not flow through the controllable bidirectional by NPN triode Q1, no electric current
The control pole G of alternating-current switch 26, the controllable bidirectional alternating-current switch 26 are not turned on, and rotor 11 does not turn.
If the second Hall sensor 23 detects the magnetic pole of rotor as S poles, the position of magnetic pole of output logic high " 1 "
For signal to the ON-OFF control circuit 30, the cathode of the diode D1 of the ON-OFF control circuit 30 receives high level, and described three
Pole pipe Q1 is turned on, therefore the anode of the diode D1 is high level, if AC power is in negative half during the electric motor starting
Week, the AC power in negative half period cannot flow through the control pole G of the controllable bidirectional alternating-current switch 26 and resistance R1, therefore institute
It states controllable bidirectional alternating-current switch 26 to be not turned on, rotor 11 does not turn.If AC power is in positive half cycle during the electric motor starting, place
The control pole G of the controllable bidirectional alternating-current switch 26 is flowed to by NPN triode Q1, resistance R1 in the AC power of positive half cycle,
The controllable bidirectional alternating-current switch 26 turns on, and the positive half cycle of AC power is flowed through in stator winding, and the rotor 11 revolves clockwise
Turn.
Such as pre-control motor reversal i.e. rotation counterclockwise, make the steering setting signal CTRL output logic lows " 0 ",
The first end 51 of the steering controling circuit 50 is connected with second end 52, and the ON-OFF control circuit 30 receives first Hall
The position of magnetic pole signal that sensor 22 exports.If the first Hall sensor 22 senses the position of magnetic pole of rotor as N poles, described
The position of magnetic pole signal of the output terminal H1 output logic highs " 1 " of first Hall sensor 22, the triode Q1 conductings, because
The anode of this diode D1 is high level, if AC power is in negative half period during the electric motor starting, in negative half period
AC power cannot flow through the control pole G of the controllable bidirectional alternating-current switch 26 and resistance R1, therefore the controllable bidirectional is handed over
Stream switch 26 is not turned on, and rotor 11 does not turn.If during the electric motor starting AC power be positive half cycle, the exchange in positive half cycle
Power supply flow to the control pole G of the controllable bidirectional alternating-current switch 26 by triode Q1, resistance R1, and the controllable bidirectional exchange is opened
26 conductings are closed, rotor 11 starts rotation counterclockwise.
If first Hall sensor 22 senses the position of magnetic pole of rotor as S poles, first Hall sensor
The position of magnetic pole signal of 22 output terminal H1 output logic lows " 0 ", the cathode of the diode D1 receive logic low,
The triode Q1 shut-offs, if AC power is in negative half period during the electric motor starting, the electric current in negative half period passes through can
Control pole G, the resistance R1 and diode D1 ground connection, the controllable bidirectional alternating-current switch 26 for controlling two-way exchange switch 26 are turned on, fixed
The negative half period of AC power is flowed through in sub- winding 16, the rotor 11 starts rotation counterclockwise.If it is handed over during the electric motor starting
Galvanic electricity source is in positive half cycle, and the AC power in positive half cycle can not be by NPN triode Q1, and no electric current flows through described controllable
The control pole G of two-way exchange switch 26, the controllable bidirectional alternating-current switch 26 are not turned on, and rotor 11 does not turn.
The situation that above-mentioned rotor 11 does not turn refers to situation during electric motor starting, after electric motor starting success, even if described
Controllable bidirectional alternating-current switch 26 is not turned on, and rotor 11 can also keep inertia to rotate.In addition, changing the rotation direction of rotor 11
When, it is necessary to first stop motor rotor 11 rotation, rotor 11 is made to be stopped at predetermined at rest position, make motor rotor 11 stop rotation
Turn to be easily achieved, such as increase a switch (not shown) between AC power 24 and the stator winding 16 of motor, by this
One predetermined time of switch OFF can make the rotor 11 stop rotating.The rotor 11 of motor is made, which to stop rotating, can also other
Embodiment, for example, refer to Fig. 5, the switch unit of the steering controling circuit 50 further comprises one the 4th end 54, described
4th end, 54 sky connects, and the state of the steering controling circuit 50 turns to the control of setting signal CTRL1, CTRL2 by two-way.
It names an embodiment and illustrates the process for converting motor rotation direction.User can be exported by peripheral control unit
The steering setting signal of CTRL1=0, CTRL2=0 are to the steering controling circuit 50, and the steering controling circuit 50 is by first
End 51 is connected with second end 52, selects first Hall sensor 22 being connected to the ON-OFF control circuit 30, motor is inverse
Hour hands rotate.After electric motor starting, pre-control motor conversion rotation direction can export CTRL1=1, CTRL2 by peripheral control unit
=1 steering setting signal, the first end 51 of the steering controling circuit 50 connect the 4th end 54, because the 4th end 54 is empty
It connects, no electric current flows through the control pole G of the controllable bidirectional alternating-current switch 26, and motor can turn one with inertia and stop after the meeting.Centainly
After time, the steering setting signal of the peripheral control unit output CTRL1=1, CTRL2=0 to the steering controling circuit 50,
The first end 51 of the steering controling circuit 50 connects the 3rd end 53, selects second Hall sensor 23 being connected to described
ON-OFF control circuit 30, motor can rotate clockwise.
Table 2 is refer to, the position of magnetic pole of stator and rotor and the polarity control electricity of power supply are set for the specific steering according to motor
The situation of machine rotating.
Table 2
It will be understood by those skilled in the art that the ON-OFF control circuit 30, rectifier, detection circuit can integration packaging exist
It in integrated circuit, can such as be realized by ASIC single-chips, to reduce circuit cost, and improve the reliability of circuit.
Fig. 6 is refer to, is the circuit diagram of the second embodiment of motor of the present invention, the present embodiment and embodiment illustrated in fig. 1
Difference is, using two integrate the ON-OFF control circuits 30, rectifier, detection circuit motor driving integrated circuit (IC)
To realize the control of motor positive and inverse.Described two motor driving integrated circuits are denoted as the first motor driving integrated circuit respectively
100 and second motor driving integrated circuit 200.The integrated electricity of first motor driving integrated circuit, 100 and second motor driving
Road 200 includes housing, and the housing includes antetheca and rear wall, the antetheca of first motor driving integrated circuit 100 towards
The rotor 11, the rear wall of second motor driving integrated circuit 200 is towards the rotor 11.The first motor driving collection
Into inside 100 and second motor driving integrated circuit 200 of circuit, first implements shown in the output terminal H1 and Fig. 1 of Hall sensor
Mode is not all to be connected directly to the Second terminal of the ON-OFF control circuit 30.First motor driving integrated circuit 100 and
ON-OFF control circuit, rectifier, the structure and working principle of detection circuit and first in two motor driving integrated circuits 200 is real
It is identical to apply example, details are not described herein.The steering controling circuit 50 is not integrated in inside motor driving integrated circuit, by with
It is set to and is set according to the steering of motor, the control for selectively exporting first or second motor driving integrated circuit 100,200
Signal output, to control the conducting state of the controllable bidirectional alternating-current switch 26, makes electricity to the controllable bidirectional alternating-current switch 26
Machine is rotated with specific direction or to be rotated in the opposite direction with the certain party.In present embodiment, the specific direction is
Counterclockwise, described and certain party is clockwise in the opposite direction.
In Fig. 6 illustrated embodiments, the first end 51 of the steering controling circuit 50 connects the controllable bidirectional exchange
The control pole G of switch 26, the second end 52 of the steering controling circuit 50 connect first motor driving integrated circuit 100
The Second terminal of ON-OFF control circuit 30, the 3rd end 53 of institute's steering controling circuit 50 connect the integrated electricity of the second motor driving
The Second terminal of the ON-OFF control circuit 30 on road 200.The rectifier of first and second motor driving integrated circuit 100,200
First input end I1 pass through resistance R0 connection first nodes A, first and second described motor driving integrated circuit 100,200
Rectifier the second input terminal I2 connection section points B, the first anode T1 connections institute of the controllable bidirectional alternating-current switch 26
Section point B is stated, the second plate T2 connections first node A, the AC power 24 and the stator winding 16 are series at
Between first and second node A, B.When the steering setting signal CTRL that the steering controling circuit 50 receives is logic low,
First end 51 is connected with second end 52, and the motor rotates counterclockwise；The steering setting letter that the steering controling circuit 50 receives
When number CTRL is logic high, the first end 51 of the steering controling circuit 50 is connected with the 3rd end 53, the motor up time
Pin rotates.
Fig. 7 is refer to, is the circuit diagram of the 3rd embodiment of motor of the present invention, the present embodiment and embodiment illustrated in fig. 6
Difference lies in the stator winding 16 is series at the first node A and section point B with the controllable bidirectional alternating-current switch 26
Between, the AC power 24 is connected between first node A and section point B.
Fig. 8 is refer to, is the circuit diagram of the fourth embodiment of motor-drive circuit of the present invention, shown in the present embodiment and Fig. 6
Difference lies in the positions to steering controling circuit 50 to be converted for embodiment, in the present embodiment, the steering controling circuit
50 first ends 51 connect first motor driving integrated circuit 100 by resistance R0 connection first nodes A, the second end 52
Rectifier first input end I1, the 3rd end 53 connects the rectifier of second motor driving integrated circuit 200
First input end I1.The steering controling circuit 50 selectively controls AC power 24 according to the steering setting signal CTRL
It powers to the first motor driving integrated circuit 100 or powers to the second motor driving integrated circuit 200, by the first or second
The control signal that motor driving integrated circuit 100,200 exports is exported to the controllable bidirectional alternating-current switch 26, with described in control
The conducting state of controllable bidirectional alternating-current switch 26, and then control motor forward or reverse.
Fig. 9 is refer to, is the circuit diagram of the 5th embodiment of motor-drive circuit of the present invention, described in the present embodiment and Fig. 8
Embodiment difference lies in, the stator winding 16 and the controllable bidirectional alternating-current switch 26 be series at the first node A and
Between section point B, the external ac power source 24 is connected between first node A and section point B.
In the above embodiment, the switch unit of the steering controling circuit 50 can be mechanical switch or electronic switch, institute
Stating mechanical switch includes relay, single-pole double-throw switch (SPDT) and single-pole single-throw switch (SPST), and the electronic switch includes solid-state relay, gold
Belong to oxide semiconductor field effect transistor, silicon controlled rectifier (SCR), three terminal bidirectional thyristor, insulated gate bipolar transistor, double
Pole junction transistors, thyristor, optic coupling element etc..
It will be understood by those skilled in the art that in Fig. 6 into embodiment shown in Fig. 9, the steering controling circuit 50
Form as shown in Figure 5 also can be used in switch unit, and first passing through steering controling circuit 50 when motor is controlled to change direction controls
Motor stalls.Certainly the stalling of control motor can also use other modes, such as in AC power 24 and the stator winding of motor
Increase a control switch (not shown) between 16, rotor can be made to stop rotation this control one predetermined time of switch OFF
Turn, and be stopped at predetermined resting position.
Motor-drive circuit provided in an embodiment of the present invention passes through two detection circuits or two motor driving integrated circuits
The position of magnetic pole of rotor 11 is detected, described two detection circuits or two motor driving integrated circuits detect rotor same pole
When, the opposite position of magnetic pole signal of output phase, steering controling circuit 50 is according to the corresponding detection of the steering of motor setting selection
The state of the position of magnetic pole signal or control signal control controllable bidirectional alternating-current switch of circuit or motor driving integrated circuit output,
And then the current direction for flowing through motor stator winding is controlled, to control the forward or reverse of motor.It is needing to be with phase derotation
When the different application offer driving motor in direction is provided, it need to only switch the terminal that the steering controling circuit 50 turns on.It is described
Motor-drive circuit is simple in structure, versatile.
Rotor 11 in the above embodiment is p-m rotor, and each magnetic pole of p-m rotor can be extracted with rare earth
The neodium magnet material come can also use r c neodium magnet to make magnetic pole (rare earth is extract, also referred to as rubber magnet magnet)
Can be trapezoidal wave to make counter electromotive force in more durable rotor magnetic pole motor, in other embodiment, p-m rotor may be used also
To be made of the other materials such as materials such as ferrite, neodymium iron boron, aluminium nickel cobalt, the waveform of counter electromotive force be alternatively sine wave etc. other
Waveform.
Rectification circuit described in the above embodiment uses full bridge rectifier, in other embodiment, also can be used as
Half bridge rectifier circuit, full-wave rectifying circuit or half-wave rectifying circuit.In present embodiment, the voltage after rectification is through the voltage stabilizing two
Pole pipe Z1 carries out voltage stabilizing, in other embodiment, the electronic components such as three terminal regulator also can be used and carry out voltage stabilizing.
It will be understood by those skilled in the art that the motor described in the embodiment of the present invention is suitable for driving automotive window, office
Or the equipment such as roller shutter of family expenses.Motor described in the embodiment of the present invention can be permanent magnet AC motor, such as permanent magnet synchronous motor, forever
Magnetic BLDC motors.The motor of the embodiment of the present invention is preferably single-phase permanent alternating current generator, such as single-phase permanent-magnet synchronous motor, single-phase
Permanent magnetism BLDC motors.When the motor is permanent magnet synchronous motor, the external ac power source is mains supply；When the motor
For permanent magnetism BLDC motors when, the external ac power source be inverter output AC power.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
Claims (13)
1. a kind of motor-drive circuit, for driving motor rotor compared with stator rotation, the motor-drive circuit includes：
Controllable bidirectional alternating-current switch is connected to the both ends of AC power with the winding of motor；
First and second detection circuit is respectively used to detect the position of magnetic pole of the rotor, first and second described detection circuit
When detecting rotor same pole, the opposite position of magnetic pole signal of output phase；
Steering controling circuit connects first and second described detection circuit, is configured as setting selectivity according to the steering of motor
Position of magnetic pole signal that ground exports the first detection circuit or by the position of magnetic pole signal output of the second detection circuit output to one
ON-OFF control circuit；
The ON-OFF control circuit is configured as according to the position of magnetic pole signal and the polarity information of the AC power received, control
Make the conducting state of the controllable bidirectional alternating-current switch with control motor with specific direction rotate or with the specific direction phase
Anti- direction rotates.
2. motor-drive circuit as described in claim 1, which is characterized in that the ON-OFF control circuit is configured as described
AC power is when positive half cycle and the steering controling circuit export the first signal or the AC power is negative half period and described
Steering controling circuit turns on the controllable bidirectional alternating-current switch when exporting secondary signal.
3. motor-drive circuit as described in claim 1, which is characterized in that when motor is rotated with specific direction, the steering
Control circuit is by the position of magnetic pole signal output that the first detection circuit exports to the ON-OFF control circuit；Motor with the spy
When fixed side rotates in the opposite direction, the position of magnetic pole signal output that the steering controling circuit exports the second detection circuit is extremely
The ON-OFF control circuit.
4. motor-drive circuit as described in claim 1, which is characterized in that first detection circuit is passed including the first Hall
Sensor；Second detection circuit includes the second Hall sensor, and the Hall thin slice in second Hall sensor is towards institute
It is turned over compared with the direction of Hall thin slice towards the rotor in first Hall sensor in 180 degree in the direction for stating rotor
Turn.
5. motor-drive circuit as claimed in claim 4, which is characterized in that in motor resting position, first Hall passes
The N poles of sensor and the neighbouring rotor of the second Hall sensor are set or first Hall sensor turns adjacent to described
The N poles of son, second Hall sensor is adjacent to the S poles of the rotor.
6. motor-drive circuit as described in claim 1, which is characterized in that the steering controling circuit includes switch unit,
The switch unit includes the first to the 3rd end, and the first end connects the ON-OFF control circuit, and the second end receives institute
The position of magnetic pole signal of the first detection circuit output is stated, the 3rd end receives the position of magnetic pole of the second detection circuit output
Signal, the first end are selectively connected the second end or the 3rd end according to the steering of motor setting, and the first end connects
When connecing the second end, motor is rotated with specific direction；When the first end connects three end, the motor with it is specific
Side rotates in the opposite direction.
7. motor-drive circuit as claimed in claim 6, which is characterized in that the switch unit of the steering controling circuit also wraps
The 4th end is included, the 4th end sky connects, and when motor rotates during pre-switch direction of motor rotation, the first end first connects described
4th end, one preset time makes rotor stop at predetermined at rest position, and the first end reconnects hold corresponding with pre-switch direction
Son.
8. motor-drive circuit as claimed in claim 4, which is characterized in that the motor-drive circuit is further included at least
The rectifier of DC voltage is provided to first Hall sensor and the second Hall sensor, the rectifier include output compared with
First output terminal of high voltage and the second output terminal of output low voltage, the power end of first and second Hall sensor
First output terminal is connected, the ground terminal of first and second Hall sensor connects the second output terminal.
9. motor-drive circuit as claimed in claim 8, which is characterized in that the motor-drive circuit further include with it is described whole
The reducing transformer of device connection is flowed, for inputing to the rectifier, the ON-OFF control circuit again after AC supply voltage is depressured
Including first resistor, NPN triode and be series between steering controling circuit and the controllable bidirectional alternating-current switch second
Resistance and diode；The cathode of the diode connects the steering controling circuit；First resistor one end connection is described whole
The first output terminal of device is flowed, the other end connects the cathode of the diode；The base stage of the NPN triode connects the diode
Cathode, emitter connects the anode of the diode, and collector connects the first output terminal of the rectifier.
10. motor-drive circuit as described in claim 1, which is characterized in that the motor-drive circuit further includes a control
Switch, the control switch are connected between the AC power and machine winding, pre-switch motor steering during motor operation,
Switch motor is first turned off control one predetermined time of switch before turning to, until the rotor is parked in predetermined at rest position.
11. a kind of motor-drive circuit, for driving motor rotor compared with stator rotation, the motor-drive circuit bag
It includes：
Controllable bidirectional alternating-current switch, the controllable bidirectional alternating-current switch are connected between first and second node, machine winding with
One external ac power source is series between first, second node；Or the controllable bidirectional alternating-current switch is connected with machine winding
Between first and second node, external ac power source is connected between first and second node；
With first and second mutually isostructural motor driving integrated circuit, first and second described motor driving integrated circuit is equal
Including housing, the housing includes antetheca and rear wall, and the antetheca of first motor driving integrated circuit is towards the rotor, institute
The rear wall of the second motor driving integrated circuit is stated towards the rotor, first, second motor driving integrated circuit includes：
Detection circuit for detecting the position of magnetic pole of the rotor, and exports position of magnetic pole signal in its output terminal；
ON-OFF control circuit is configured as the pole of the position of magnetic pole signal and the AC power according to detection circuit output
Property output control signal；
Steering controling circuit is configured as being set according to the steering of motor, selectively drives first or second motor integrated
The control signal of circuit output is exported to the controllable bidirectional alternating-current switch, to control the conducting of the controllable bidirectional alternating-current switch
State makes motor be rotated with specific direction or to be rotated in the opposite direction with the certain party.
12. a kind of motor, including stator, rotor and the motor-drive circuit as any one of claim 1-11.
13. motor as claimed in claim 12, which is characterized in that the motor is single-phase permanent alternating current generator, single-phase permanent
Synchronous motor or single-phase permanent BLDC motors.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611036649.4A CN108075696B (en) | 2016-11-15 | 2016-11-15 | Motor and motor drive circuit |
| DE102017126587.2A DE102017126587A1 (en) | 2016-11-15 | 2017-11-13 | Motor and motor driver circuit |
| DE102017126621.6A DE102017126621A1 (en) | 2016-11-15 | 2017-11-13 | Motor and motor driver circuit |
| US15/812,192 US20180138842A1 (en) | 2016-11-15 | 2017-11-14 | Motor and motor driving circuit |
| US15/812,224 US20180138848A1 (en) | 2016-11-15 | 2017-11-14 | Motor and motor driving circuit |
| JP2017219893A JP2018093709A (en) | 2016-11-15 | 2017-11-15 | Motor and motor driving circuit |
| JP2017219892A JP2018093708A (en) | 2016-11-15 | 2017-11-15 | Motor and motor driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611036649.4A CN108075696B (en) | 2016-11-15 | 2016-11-15 | Motor and motor drive circuit |
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| Publication Number | Publication Date |
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| CN108075696A true CN108075696A (en) | 2018-05-25 |
| CN108075696B CN108075696B (en) | 2021-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611036649.4A Expired - Fee Related CN108075696B (en) | 2016-11-15 | 2016-11-15 | Motor and motor drive circuit |
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| Country | Link |
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| CN (1) | CN108075696B (en) |
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| CN110350740A (en) * | 2019-07-15 | 2019-10-18 | 太仓市海谷五金机电设备有限公司 | A kind of bi-directional energy-saving motor |
| CN111865170A (en) * | 2019-04-25 | 2020-10-30 | 日本电产高科电机株式会社 | Motor control device |
| EP3832879A1 (en) * | 2019-12-03 | 2021-06-09 | Melexis Bulgaria Ltd. | Control of a single coil bldc motor |
| TWI738096B (en) * | 2019-10-25 | 2021-09-01 | 黃柏原 | Brushless direct current motor with variable stator |
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| CN204993122U (en) * | 2015-06-18 | 2016-01-20 | 德昌电机(深圳)有限公司 | Permanent -magnet machine drive circuit |
| CN204993136U (en) * | 2015-06-18 | 2016-01-20 | 德昌电机(深圳)有限公司 | Motor drive circuit |
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| CN101635549A (en) * | 2008-07-25 | 2010-01-27 | 松下电工株式会社 | Single-phase brushless DC motor drive circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111865170A (en) * | 2019-04-25 | 2020-10-30 | 日本电产高科电机株式会社 | Motor control device |
| CN110350740A (en) * | 2019-07-15 | 2019-10-18 | 太仓市海谷五金机电设备有限公司 | A kind of bi-directional energy-saving motor |
| TWI738096B (en) * | 2019-10-25 | 2021-09-01 | 黃柏原 | Brushless direct current motor with variable stator |
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| US11515823B2 (en) | 2019-12-03 | 2022-11-29 | Melexis Bulgaria Ltd | Control of a single coil BLDC motor |
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| CN108075696B (en) | 2021-08-06 |
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