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CN111075738B - Brushless motor-based fan starting control method and control device - Google Patents

Brushless motor-based fan starting control method and control device Download PDF

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Publication number
CN111075738B
CN111075738B CN201911234112.2A CN201911234112A CN111075738B CN 111075738 B CN111075738 B CN 111075738B CN 201911234112 A CN201911234112 A CN 201911234112A CN 111075738 B CN111075738 B CN 111075738B
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brushless motor
rotor
rotation
rotation direction
fan
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CN111075738A (en
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秦晨
张奇
毛黎明
刘荣鹏
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Shanghai Yingheng Electronic Co ltd
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Shanghai Yingheng Electronic Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The invention discloses a brushless motor-based fan starting control method and a brushless motor-based fan starting control device, which comprise the following steps: acquiring three-phase counter electromotive force of the brushless motor; respectively determining the rotation direction and the rotation speed of the rotor of the brushless motor according to the three-phase counter electromotive force; and controlling the brushless motor to be started according to the rotation direction and the rotation speed of the rotor of the brushless motor. The invention ensures that the motor controls the fan to start in a downwind or upwind state by determining the rotation direction and the rotation speed of the rotor of the brushless motor, thereby ensuring the normal operation of the motor.

Description

Brushless motor-based fan starting control method and control device
Technical Field
The embodiment of the invention relates to the field of fan starting control, in particular to a fan starting control method and a fan starting control device based on a brushless motor.
Background
The brushless motor in the vehicle fan replaces the brush motor step by step with the advantages of high efficiency, quick response, long service life and the like. The control of the brush motor is generally divided into a sensor control mode and a sensorless control mode, the sensor control mode needs to be that a position sensor is installed in the motor to detect the position of a motor rotor, the position sensor has strict requirements on the use environment, the sensorless control mode can detect the position of the rotor without the position sensor and is not influenced by the environment where the motor is located, the sensor motor control technology and the sensorless control technology are relatively used, the cost of the motor controller is saved, the use environment is wider, and the brush motor is more and more widely applied to the application fields of a plurality of motors.
However, the vehicle fan is generally installed in front of the vehicle roof and the generator for ventilation and heat dissipation, and the external wind force is large during the driving of the vehicle, and the vehicle fan may be blown when the fan is not activated. The fan controller rotates the fan in a set direction when the fan is started, and the direction of the controller rotation and the direction of the fan rotation may be the same or opposite. The fan is started under the condition of the same direction (downwind) or opposite direction (upwind), and because the position of a fan rotor cannot be identified by a blown fan controller, the motor cannot be normally started and operated by using a traditional motor control algorithm, and even the motor is damaged.
Disclosure of Invention
The embodiment of the invention provides a brushless motor-based fan starting control method and a brushless motor-based fan starting control device, which are used for controlling a fan to start in a downwind or upwind state by a brushless motor and ensuring the normal operation of the motor.
The embodiment of the invention provides a brushless motor-based fan starting control method, which comprises the following steps:
acquiring three-phase counter electromotive force of the brushless motor;
respectively determining the rotation direction and the rotation speed of the rotor of the brushless motor according to the three-phase counter electromotive force;
and controlling the brushless motor to be started according to the rotation direction and the rotation speed of the rotor of the brushless motor.
Optionally, the determining the rotation direction of the brushless motor rotor according to the three-phase back electromotive force includes:
calculating a sector value of the brushless motor rotor in a sector period according to the three-phase back electromotive force;
and determining the rotation direction of the brushless motor rotor according to the corresponding relation between the preset sector value and the rotation direction.
Optionally, the determining the rotation direction of the brushless motor rotor according to the three-phase back electromotive force includes:
recording the time of the brushless motor rotor in a sector period;
and determining the rotation speed of the rotor of the brushless motor according to the time of the sector period.
Optionally, the calculating a sector value of the brushless motor rotor in a sector period according to the three-phase back electromotive force includes:
three variables A, B and C are defined, then:
if Ua is greater than 0, A is 1, otherwise A is 0;
if Ub is greater than 0, B is 1, otherwise B is 0;
if Uc is greater than 0, C is 1, otherwise C is 0;
the sector value N-4 + C +2 + B + a.
Optionally, the determining the rotation speed of the rotor of the brushless motor according to the time of the sector period includes:
the rotating speed s of the brushless motor rotor meets the following conditions:
Figure BDA0002304413130000031
wherein T represents the time of the one sector period and P represents a rotor pole pair of the brushless motor rotor.
Optionally, controlling the brushless motor to be turned on according to the rotation direction and the rotation speed of the rotor of the brushless motor, includes:
determining a driving control signal of the brushless motor according to the rotation speed of the rotor of the brushless motor;
and controlling the brushless motor to be started according to the rotation direction of the brushless motor and the driving control signal.
Optionally, determining a driving control signal of the brushless motor according to the rotation speed of the rotor of the brushless motor includes:
calculating duty ratio information of the driving control signal according to the back electromotive force of the brushless motor;
according to the rotation direction of the brushless motor and the drive control signal, controlling the brushless motor to be started, comprising:
and controlling the brushless motor to be started according to the rotation direction of the rotor of the brushless motor and the drive control signal containing the duty ratio information.
Optionally, the rotation direction of the brushless motor rotor includes static rotation, downwind rotation and upwind rotation;
according to the direction of rotation and the rotational speed of brushless motor rotor, control brushless motor opens, include:
if the rotation direction of the brushless motor rotor is static, controlling the fan to be normally started according to a normal driving control signal;
if the rotating direction of the brushless motor rotor is downwind rotation, controlling the fan to start downwind;
and if the rotation direction of the brushless motor rotor is against-wind rotation, controlling the fan to brake against the wind, and controlling the fan to normally start according to the normal driving control signal when the brushless motor rotor is static.
Based on the same inventive concept, the embodiment of the present invention further provides a fan start control device based on a brushless motor, including:
the three-phase back electromotive force acquisition module is used for acquiring three-phase back electromotive force of the brushless motor;
the rotation state determining module is used for respectively determining the rotation direction and the rotation speed of the brushless motor rotor according to the three-phase back electromotive force;
and the control module is used for controlling the brushless motor to be started according to the rotation direction and the rotation speed of the rotor of the brushless motor.
Optionally, the rotation state determining module includes a rotation direction determining submodule and a rotation speed determining submodule;
the rotation direction determining submodule includes:
a sector value calculating unit for calculating a sector value of the brushless motor rotor in a sector period according to the three-phase back electromotive force;
and the rotation direction determining unit is used for determining the rotation direction of the brushless motor rotor according to the corresponding relation between the preset sector value and the rotation direction.
The rotation speed determination submodule includes:
the period calculation unit records the time of the brushless motor rotor in a sector period;
and the rotating speed calculating unit determines the rotating speed of the rotor of the brushless motor according to the time of the sector period.
In the embodiment of the invention, the rotation direction and the rotation speed of the rotor of the brushless motor are respectively determined according to the obtained three-phase counter electromotive force of the brushless motor, and the brushless motor is controlled to be started by the determined rotation direction and rotation speed of the rotor of the brushless motor. By analyzing the rotating direction and the rotating speed of the rotor of the brushless motor, the brushless motor can control the fan to start in a downwind or upwind state, the normal operation of the motor is ensured, and the damage rate of the motor is reduced.
Drawings
Fig. 1 is a flowchart illustrating a brushless motor-based fan start control method according to a first embodiment of the present invention;
fig. 2 is a schematic flowchart illustrating another brushless-motor-based fan start control method according to a second embodiment of the present invention;
FIG. 3 is a schematic sector division diagram of a synthesized voltage space vector according to a second embodiment of the present invention;
fig. 4 is a schematic flow chart illustrating a process of controlling the brushless motor to be turned on according to a third embodiment of the present invention;
fig. 5 is a flowchart of implementing the downwind start or the upwind brake start in the third embodiment of the present invention;
fig. 6 is a schematic structural diagram of a brushless motor-based fan start control device according to a fourth embodiment of the present invention;
fig. 7 is a schematic structural diagram of a fan start control device based on a brushless motor according to a fifth embodiment of the present invention;
fig. 8 is a schematic structural diagram of a control module in a brushless motor-based fan start control device according to a sixth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic flowchart of a brushless motor-based fan start control method according to an embodiment of the present invention, and as shown in fig. 1, the brushless motor-based fan start control method includes:
s110, acquiring three-phase back electromotive force of the brushless motor;
acquiring three opposite electromotive forces before software design, and measuring brushless voltage with oscilloscopeThe software uses ADC to sample and obtain the terminal voltage u generated by three-phase stator when rotor freely rotatesa、ubAnd ucAnd satisfies the following conditions:
ua+ub+uc＝0。 (1)
s120, respectively determining the rotation direction and the rotation speed of the rotor of the brushless motor according to the three-phase back electromotive force;
and respectively determining the rotation direction and the rotation speed of the rotor of the brushless motor by the acquired three-phase counter electromotive force.
And S130, controlling the brushless motor to be started according to the rotation direction and the rotation speed of the rotor of the brushless motor.
And controlling the brushless motor to normally start and operate in a downwind state or an upwind state according to the acquired rotation direction and rotation speed of the rotor of the brushless motor.
According to the embodiment of the invention, the three-phase counter electromotive force of the brushless motor is obtained, the rotating direction and the rotating speed of the rotor of the brushless motor are respectively determined according to the obtained three-phase counter electromotive force of the brushless motor, and the brushless motor is controlled to be started according to the rotating direction and the rotating speed. The problem of the position of the unable discernment fan rotor of controller when the fan is blown by wind, the unable normal start operation motor of traditional motor control algorithm, even cause the motor to damage is solved, realized that brushless motor controls the fan and starts under the downwind or upwind state, guaranteed motor normal operating.
Example two
Based on the embodiment shown in fig. 1, fig. 2 is a schematic flowchart of another brushless motor-based fan start control method according to a second embodiment of the present invention. As shown in fig. 2, the process of determining the rotation direction of the rotor of the brushless motor includes:
and S211, calculating the sector value of the brushless motor rotor in one sector period according to the three-phase back electromotive force.
Suppose that the three-phase back electromotive force obtained is u respectivelya、ubAnd ucAnd three-phase counter electromotive force ua、ubAnd ucSatisfies the following conditions:
ua+ub+uc＝0； (1)
three variables A, B and C are defined, then:
if ua>0, A is 1, otherwise A is 0;
if ub>0, B is 1, otherwise B is 0;
if uc>0, C is 1, otherwise C is 0;
the sector value N-4 + C +2 + B + a.
S212, determining the rotation direction of the brushless motor rotor according to the corresponding relation between the preset sector value and the rotation direction.
According to three-phase back electromotive force ua、ubAnd ucThe value of the sector where the fan rotor is located is calculated, and the corresponding relation between the sector value and the sector when the fan rotates forwards is defined, as shown in the following table:
N 3 1 5 4 6 2
sector area Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ
The corresponding relationship between the sector value and the sector when the fan rotates reversely is defined as shown in the following table:
N 2 6 4 5 1 3
sector area Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ
And confirming the rotation direction of the fan according to the corresponding relation between the preset sector value and the rotation direction.
Wherein determining the rotation direction of the brushless motor rotor according to the three counter electromotive forces comprises:
213. calculating the period of the voltage space vector;
defining a voltage space vector UoutSatisfy Uout＝ua+aub+a2ucWherein
Figure BDA0002304413130000071
Calculating a voltage space vector UoutReal part ReU ofoutAnd dashed line ImUoutWherein, in the step (A),
Figure BDA0002304413130000081
Figure BDA0002304413130000082
the obtained three-phase back electromotive force is respectively ua、ubAnd ucAnd three-phase back electromotive force is respectively ua、ubAnd ucRespectively satisfy:
ua＝Um*cos(ωt)；
Figure BDA0002304413130000083
Figure BDA0002304413130000084
obtaining a voltage space vector U according to equations (2), (3) and (4)outReal part ReU ofoutAnd dashed line ImUoutThe expression (c), wherein,
Figure BDA0002304413130000085
Figure BDA0002304413130000086
calculating a voltage space vector U according to equation (5) and equation (6)outWherein, in the step (A),
Figure BDA0002304413130000087
the period of the voltage space vector is determined according to equation (7), and thus a sector period is determined.
And S214, determining the rotation speed of the brushless motor rotor according to the time of one sector period.
The rotating speed s of the brushless motor rotor satisfies the following conditions:
Figure BDA0002304413130000088
wherein T represents the time of the one sector period and P represents a rotor pole pair of the brushless motor rotor.
And S220, controlling the brushless motor to be started according to the rotation direction and the rotation speed of the rotor of the brushless motor.
The embodiment of the invention calculates the sector value of the brushless motor rotor in a sector period through three opposite electromotive forces, determines the rotation direction of the brushless motor rotor according to the corresponding relation between the preset sector value and the rotation direction, and further determines the rotation speed of the brushless motor rotor according to the time of the brushless motor rotor in the sector period.
EXAMPLE III
Based on the embodiment shown in fig. 1, fig. 4 is a schematic flow chart of controlling the brushless motor to turn on according to a third embodiment of the present invention, and as shown in fig. 4, a process of controlling the brushless motor to turn on includes:
s400, acquiring three-phase back electromotive force of the brushless motor;
and S410, respectively determining the rotating direction and the rotating speed of the rotor of the brushless motor according to the three-phase back electromotive force.
And S420, determining a driving control signal of the brushless motor according to the rotating speed of the rotor of the brushless motor.
Wherein the determining of the driving control signal process of the brushless motor comprises: duty ratio information of the driving control signal is calculated based on the back electromotive force of the brushless motor.
And S430, controlling the brushless motor to be started according to the rotation direction of the brushless motor and the driving control signal.
Controlling the brushless motor to be started according to the rotation direction of the rotor of the brushless motor and the driving control signal containing the duty ratio information
The rotation direction of the brushless motor rotor comprises static rotation, downwind rotation and upwind rotation.
The process of controlling the brushless motor to turn on according to the rotation direction of the brushless motor and the driving control signal is shown in fig. 5:
if the rotation direction of the brushless motor rotor is static, controlling the fan to be normally started according to the normal driving control signal;
if the rotation direction of the brushless motor rotor is downwind rotation, controlling the fan to start downwind;
if the rotation direction of the brushless motor rotor is against-wind rotation, the fan is controlled to brake against the wind, and when the brushless motor rotor is static, the fan is controlled to normally start according to the normal driving control signal.
Example four
Fig. 6 is a fan start control device based on a brushless motor according to a fourth embodiment of the present invention, and as shown in fig. 6, the fan start control device based on a brushless motor includes: the three-phase back electromotive force acquisition module 10 is used for acquiring three-phase back electromotive force of the brushless motor; the rotation state determining module 11 is configured to determine a rotation direction and a rotation speed of the brushless motor rotor according to the three-phase back electromotive force; and the control module 12 is used for controlling the brushless motor to be started according to the rotating direction and the rotating speed of the rotor of the brushless motor.
According to the embodiment of the invention, the three-phase counter electromotive force of the brushless motor is acquired by the three-phase counter electromotive force acquisition module, the rotation state determination module determines the rotation direction and the rotation speed of the rotor of the brushless motor respectively through the three-phase counter electromotive force of the brushless motor acquired by the three-phase counter electromotive force acquisition module, and the control module controls the brushless motor to be started according to the determined rotation direction and rotation speed of the rotor of the brushless motor, so that the brushless motor controls the fan to be started in a downwind or upwind state, and the normal operation of the motor is ensured.
EXAMPLE five
Fig. 7 is a schematic structural diagram of a brushless motor-based fan starting control device according to a fifth embodiment of the present invention, and as shown in fig. 7, the rotation state determining module 11 includes a rotation direction determining submodule 13 and a rotation speed determining submodule 14;
wherein, the rotation direction determination submodule 13 includes: a sector value calculation unit 130 for calculating a sector value of the brushless motor rotor in one sector period based on the three-phase back electromotive force; and a rotation direction determining unit 131, configured to determine a rotation direction of the brushless motor rotor according to a preset corresponding relationship between the sector value and the rotation direction.
The rotational speed determination submodule 14 includes: a period calculation unit 141 for recording the time of the brushless motor rotor in one sector period; and a rotation speed calculation unit 142 for determining a rotation speed of the rotor of the brushless motor according to a time of one sector period.
EXAMPLE six
Fig. 8 is a control module of a brushless motor-based fan start control device according to a sixth embodiment of the present invention, and as shown in fig. 8, the control module 12 includes: a driving control signal determining submodule 120 for determining a driving control signal of the brushless motor according to a rotation speed of the rotor of the brushless motor; and the control submodule 121 is used for controlling the brushless motor to be started according to the rotation direction of the brushless motor and the driving control signal.
Wherein, the control sub-module 121 includes: a duty ratio information calculation unit for calculating duty ratio information of the driving control signal according to the back electromotive force;
the control submodule 121 is specifically configured to control the brushless motor to be turned on according to the rotation direction of the rotor of the brushless motor and the driving control signal containing the duty ratio information.
Optionally, the rotation direction of the brushless motor rotor includes static rotation, downwind rotation and upwind rotation;
if the rotation direction of the brushless motor rotor is static, the control module is specifically used for controlling the fan to be normally started according to the normal driving control signal;
if the rotation direction of the brushless motor rotor is downwind rotation, controlling the fan to start downwind;
if the rotation direction of the brushless motor rotor is against-wind rotation, the fan is controlled to brake against the wind, and when the brushless motor rotor is static, the fan is controlled to normally start according to the normal driving control signal.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (8)

1. A fan starting control method based on a brushless motor is characterized by comprising the following steps:
acquiring three-phase counter electromotive force of the brushless motor;
respectively determining the rotation direction and the rotation speed of the rotor of the brushless motor according to the three-phase back electromotive force;
controlling the brushless motor to be started according to the rotation direction and the rotation speed of the rotor of the brushless motor;
the determining the rotation direction of the brushless motor rotor according to the three-phase back electromotive force comprises:
calculating a sector value of the brushless motor rotor in a sector period according to the three-phase back electromotive force;
determining the rotation direction of the brushless motor rotor according to the corresponding relation between the preset sector value and the rotation direction;
wherein the calculating of the sector value of the brushless motor rotor in one sector period according to the three counter electromotive forces comprises:
three variables A, B and C are defined, then:
if ua>0, A is 1, otherwise A is 0;
if ub>0, B is 1, otherwise B is 0;
if uc>0, C is 1, otherwise C is 0;
then the sector value N-4 + C +2 + B + a;
wherein u isa、ubAnd ucRepresents terminal voltage generated by the three-phase stator at the time of free rotation, and ua、ubAnd ucSatisfies the following conditions: u. ofa+ub+uc＝0。
2. The fan start control method according to claim 1, wherein the determining the rotation speed of the brushless motor rotor based on the three-phase back electromotive force comprises:
recording the time of the brushless motor rotor in a sector period;
and determining the rotation speed of the rotor of the brushless motor according to the time of the sector period.
3. The fan start control method according to claim 2, wherein the determining the rotation speed of the brushless motor rotor according to the time of the one sector period includes:
the rotating speed s of the brushless motor rotor meets the following conditions:
Figure FDA0002986511850000021
wherein T represents the time of the one sector period and P represents a rotor pole pair of the brushless motor rotor.
4. The fan start control method according to claim 1, wherein controlling the brushless motor to be turned on according to a rotation direction and a rotation speed of the brushless motor rotor comprises:
determining a driving control signal of the brushless motor according to the rotation speed of the rotor of the brushless motor;
and controlling the brushless motor to be started according to the rotation direction of the brushless motor and the driving control signal.
5. The fan start control method according to claim 4, wherein determining the drive control signal of the brushless motor based on the rotation speed of the rotor of the brushless motor comprises:
calculating duty ratio information of the driving control signal according to the back electromotive force of the brushless motor;
according to the rotation direction of the brushless motor and the drive control signal, controlling the brushless motor to be started, comprising:
and controlling the brushless motor to be started according to the rotation direction of the rotor of the brushless motor and the drive control signal containing the duty ratio information.
6. The fan start control method according to claim 5, wherein the rotation direction of the brushless motor rotor includes stationary, downwind rotation, and upwind rotation;
according to the direction of rotation and the rotational speed of brushless motor rotor, control brushless motor opens, include:
if the rotation direction of the brushless motor rotor is static, controlling the fan to be normally started according to a normal driving control signal;
if the rotating direction of the brushless motor rotor is downwind rotation, controlling the fan to start downwind;
and if the rotation direction of the brushless motor rotor is against-wind rotation, controlling the fan to brake against the wind, and controlling the fan to normally start according to the normal driving control signal when the brushless motor rotor is static.
7. A brushless motor-based fan start control device, comprising:
the three-phase back electromotive force acquisition module is used for acquiring three-phase back electromotive force of the brushless motor;
the rotation state determining module is used for respectively determining the rotation direction and the rotation speed of the brushless motor rotor according to the three-phase back electromotive force;
the control module is used for controlling the brushless motor to be started according to the rotation direction and the rotation speed of the rotor of the brushless motor;
wherein the rotation state determination module comprises a rotation direction determination submodule comprising:
a sector value calculating unit for calculating a sector value of the brushless motor rotor in a sector period according to the three-phase back electromotive force;
and the rotation direction determining unit is used for determining the rotation direction of the brushless motor rotor according to the corresponding relation between the preset sector value and the rotation direction.
8. The fan start control device of claim 7 wherein the rotation status determination module further comprises a rotation speed determination submodule;
the rotation speed determination submodule includes:
the period calculation unit records the time of the brushless motor rotor in a sector period;
and the rotating speed calculating unit determines the rotating speed of the rotor of the brushless motor according to the time of the sector period.
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JP4379702B2 (en) * 2004-02-10 2009-12-09 株式会社デンソー Brushless motor control device
CN104779874B (en) * 2015-03-19 2017-10-27 四川长虹电器股份有限公司 Outdoor fan of air-conditioner directly drags control method
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CN107702294B (en) * 2017-11-03 2020-03-10 珠海格力电器股份有限公司 Upwind starting control method and circuit of external fan of variable frequency air conditioner and air conditioner thereof
CN109098998A (en) * 2018-07-20 2018-12-28 上海肖可雷电子科技有限公司 The starting control method of external hanging type no brush and no position sensing DC fan

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