CN104242765A - Starting method for permanent magnet synchronous motor - Google Patents
Starting method for permanent magnet synchronous motor Download PDFInfo
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- CN104242765A CN104242765A CN201410431250.0A CN201410431250A CN104242765A CN 104242765 A CN104242765 A CN 104242765A CN 201410431250 A CN201410431250 A CN 201410431250A CN 104242765 A CN104242765 A CN 104242765A
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Abstract
The invention provides a starting method for a permanent magnet synchronous motor to solve the problems that according to a q-axis starting method in the prior art, switching is discontinuous and unsmooth. The starting method is characterized by comprising the steps that a motor is powered on, a current is exerted on a d axis within preset positioning time, and accordingly a rotor of the motor is positioned; after positioning is finished, the d axis is rotated to drag the motor to be accelerated to the first frequency; after dragging is finished, the current of the d axis is transferred to a q axis; after transferring is finished, the control mode is switched to the speed closed loop synchronous control mode. The starting method has the advantages that the current of the d axis is transferred to the q axis, a speed ring is delayed, the occurrence that the speed ring begins to work when the motor is not started stably yet is prevented, and the motor can be continuously and smoothly started.
Description
Technical field
The present invention relates to Motor Control Field, especially relate to the starting method of permagnetic synchronous motor.
Background technology
Frequency conversion refrigerator is a kind of refrigerator that can carry out variable frequency adjustment according to target cryogenic temperature, and it can realize better refrigeration.Extensive use permagnetic synchronous motor (Permanent Magnet Synchronous Motor, PMSM) in frequency conversion refrigerator, PMSM has the advantages such as efficiency is high, detent torque is large, energy-conservation.PMSM from asynchronous be the process of a dynamo-electric transition to synchronizing process, at present, usually adopt the Starting mode of q axle, but in the process started at q axle, from asynchronised handover to synchronously there is discontinuous, rough problem.
Summary of the invention
The present invention, for solving discontinuous, the rough problem of switching existing for q axle Starting mode of the prior art, proposes a kind of starting method of permagnetic synchronous motor.
The starting method of permagnetic synchronous motor of the present invention, comprises step:
Motor powers on, and within the positioning time of presetting, applies electric current, thus realize the location of motor to d axle;
After location is terminated, rotate d axle, accelerate to first frequency with dragging motor;
After dragging terminates, by the current transfer of d axle to q axle;
After transfer terminates, by control mode switching to speed closed loop Synchronization Control.
Further, within the positioning time of presetting, apply electric current to d axle, be specially:
Within described positioning time, apply electric current gradually to d axle and reach stationary value to electric current.
Further, within the positioning time of presetting, apply electric current to d axle, specifically comprise:
Within the accelerating time of presetting, apply electric current gradually to d axle and reach stationary value to electric current;
In stabilization time after the described accelerating time, keep electric current to be in described stationary value, wherein, described accelerating time and described stabilization time and be described positioning time.
Further, be greater than the described accelerating time described stabilization time.
Further, rotate d axle, accelerate to first frequency with dragging motor, be specially:
Keeping electric current to be in described stationary value, by rotating d axle, making the rotor of motor accelerate to rotate to first frequency.
Further, described stationary value is more than or equal to 1A and is less than or equal to 2A.
Further, described first frequency is 400 revs/min.
The invention has the beneficial effects as follows: by by the current transfer of d axle to q axle, delay speed ring, prevent when motor is also not activated steady, speed ring is just started working, and ensure that motor can have continuous, level and smooth start-up course.
Accompanying drawing explanation
Fig. 1 is the workflow diagram of the starting method of permagnetic synchronous motor of the present invention;
Fig. 2 is the schematic diagram of permagnetic synchronous motor three-phase voltage phasor coordinate in the present invention;
Fig. 3 is that the present invention adopts the first execution mode of step 101 to carry out the schematic diagram of work;
Fig. 4 is that the present invention adopts the second execution mode of step 101 to carry out the schematic diagram of work.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail.
The application provides the starting method of permagnetic synchronous motor, comprises step: motor powers on, and within the positioning time of presetting, applies electric current, thus realize the location of rotor to d axle; After location is terminated, rotate d axle, accelerate to first frequency with dragging motor; After dragging terminates, by the current transfer of d axle to q axle; After transfer terminates, by control mode switching to speed closed loop Synchronization Control.
By by the current transfer of d axle to q axle, delay speed ring, prevent when motor is also not activated steady, speed ring is just started working, and ensure that motor can have continuous, level and smooth start-up course.
The starting method of the permagnetic synchronous motor of the application, is applied in the permagnetic synchronous motor without transducer, and as shown in Figure 1, described starting method comprises:
Step 101: motor powers on, within the positioning time of presetting, applies electric current to d axle, thus realizes the location of motor.
Wherein, because motor is in a closed container, cannot judge therefore, to need the position that the motor last time stops first positioning motor.The existing permagnetic synchronous motor without transducer has three-phase voltage phasor coordinate as shown in Figure 2, wherein, the coordinate built by d axle and q axle is two-phase rotating coordinate system, d axle is consistent with the direction of rotor, in addition, N and S is the magnetic field of rotor, and A, B and C are three-phase static coordinate system, α and β is two-phase rest frame, and θ is the angle of rotor.
Further, in this application, step 101 comprises two kinds preferred embodiment, concrete:
In a first embodiment, in T1 in the positioning time of presetting, apply electric current gradually to d axle and reach stationary value I to electric current.Wherein, those skilled in the art can set T1 positioning time according to actual needs, and the application only gets 1s for T1 and is described.Further, in specific implementation process, as shown in Figure 3, in 1s, by the electric current applying linearly to change to d axle, electric current is made to increase to stationary value I gradually.Preferably, described stationary value I is more than or equal to 1A and is less than or equal to 2A, and such as, the stationary value I of electric current can be 1.5A.
In the second execution mode, in the accelerating time T0 preset, apply electric current gradually to d axle and reach stationary value I to electric current, stabilization time after accelerating time T0 is in T2, keep electric current to be in described stationary value I, wherein, accelerating time T0 and stabilization time T2's and be T1 positioning time.Preferably, stabilization time, T2 was greater than accelerating time T0.Wherein, those skilled in the art can according to actual needs to accelerating time T0 and stabilization time T2 set, the application only gets 0.4s with T0, and it is that example is described that T2 gets 0.6s.Further, in specific implementation process, as shown in Figure 4, in 0.4s, by the electric current applying linearly to change to d axle, make electric current increase to stationary value I gradually, as 1.5A, in ensuing 0.6s, maintain electric current and be in 1.5A.
In addition, in a step 101, also can directly apply constant electric current to d axle in the positioning time of presetting in T1, e.g., in 1s, keep the electric current applying 1.5A.
After completing steps 101, perform step 102: after location is terminated, rotate d axle, accelerate to first frequency with dragging motor.
In specific implementation process, when arriving positioning time, then showing that position fixing process terminates, such as, when the time reaches 1s, then showing that location is terminated, starting to perform step 102.Concrete, keeping electric current to be in stationary value I, by accelerating to rotate d axle, making the rotor of motor follow d axle to rotate, thus realize dragging motor and accelerate, finally, dragging motor accelerates to first frequency, and wherein, first frequency can be 400 revs/min.In addition, first frequency is relevant with the position estimation method that step 104 medium velocity closed-loop synchronization controls to adopt, if estimation is compared with the position under the slow-speed of revolution, then first frequency can lower than 400 revs/min, otherwise first frequency can higher than 400 revs/min.Further, for preventing compressor from not lubricating out, the dragging time is generally 0.5s.
After completing steps 102, perform step 103: after dragging terminates, by the current transfer of d axle to q axle.
In specific implementation process, when motor accelerates to first frequency, the electric current of d axle is transferred to q axle gradually, thus make d axle no longer include electric current, and q axle has electric current.Preferably, the electric current of d axle is reduced to 0A gradually, meanwhile, increases the electric current of q axle gradually.Wherein, the electric current of q axle is less than 2A usually, and is generally a few tens of milliseconds transfer time, such as, and 20ms.
In this application, by by the current transfer of d axle to q axle, delay speed ring, prevent when motor is also not activated steady, speed ring is just started working, and ensure that motor can have continuous, level and smooth start-up course.
After completing steps 103, perform step 104: after transfer terminates, by control mode switching to speed closed loop Synchronization Control.
In specific implementation process, after transfer terminates, switch to speed closed loop Synchronization Control, those skilled in the art can select the type of speed closed loop Synchronization Control needed for actual, and the application does not limit.Wherein, speed closed loop Synchronization Control is the control method of a class based on back electromotive force estimated position.In the start-up course of the application's motor, first by motor drag to certain frequency, i.e. rotating speed, then perform the existing control method based on back electromotive force estimated position, thus, effectively avoid in q axle start-up course discontinuous, the rough situation occurred.
In this application, step 101 is position fixing process, step 102 is dragging process, step 103 is current transfer transient process, and step 104 is synchronizing process, and corresponding open loop speed, as shown in Figure 3 and Figure 4, no matter step 101 adopts the first above-mentioned execution mode, or the second execution mode, motor all startup stage keep current continuity, level and smooth.
Claims (7)
1. the starting method of permagnetic synchronous motor, is characterized in that, comprises step:
Motor powers on, and within the positioning time of presetting, applies electric current, thus realize the location of rotor to d axle;
After location is terminated, rotate d axle, accelerate to first frequency with dragging motor;
After dragging terminates, by the current transfer of d axle to q axle;
After transfer terminates, by control mode switching to speed closed loop Synchronization Control.
2. the starting method of permagnetic synchronous motor as claimed in claim 1, is characterized in that, within the positioning time of presetting, applies electric current, be specially to d axle:
Within described positioning time, apply electric current gradually to d axle and reach stationary value to electric current.
3. the starting method of permagnetic synchronous motor as claimed in claim 1, is characterized in that, within the positioning time of presetting, applies electric current, specifically comprise to d axle:
Within the accelerating time of presetting, apply electric current gradually to d axle and reach stationary value to electric current;
In stabilization time after the described accelerating time, keep electric current to be in described stationary value, wherein, described accelerating time and described stabilization time and be described positioning time.
4. the starting method of permagnetic synchronous motor as claimed in claim 3, it is characterized in that, described stabilization time is greater than the described accelerating time.
5. the starting method of permagnetic synchronous motor as claimed in claim 2 or claim 3, is characterized in that, rotates d axle, accelerates to first frequency, be specially with dragging motor:
Keeping electric current to be in described stationary value, by rotating d axle, making the rotor of motor accelerate to rotate to first frequency.
6. the starting method of permagnetic synchronous motor as claimed in claim 2 or claim 3, it is characterized in that, described stationary value is more than or equal to 1A and is less than or equal to 2A.
7. the starting method of permagnetic synchronous motor as claimed in claim 1, it is characterized in that, described first frequency is 400 revs/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410431250.0A CN104242765A (en) | 2014-08-28 | 2014-08-28 | Starting method for permanent magnet synchronous motor |
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| CN201410431250.0A CN104242765A (en) | 2014-08-28 | 2014-08-28 | Starting method for permanent magnet synchronous motor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779874A (en) * | 2015-03-19 | 2015-07-15 | 四川长虹电器股份有限公司 | Direct drag control method for outdoor fan of air conditioner |
| CN105529979A (en) * | 2016-02-01 | 2016-04-27 | 四川长虹电器股份有限公司 | Closed-loop control method for motor starting speed |
| CN106849807A (en) * | 2016-12-30 | 2017-06-13 | 威灵（芜湖）电机制造有限公司 | Blower motor and its startup method and apparatus |
| CN108540016A (en) * | 2018-04-28 | 2018-09-14 | 四川虹美智能科技有限公司 | A kind of startup method and device of motor |
| CN111262494A (en) * | 2020-03-12 | 2020-06-09 | 北京环卫集团环卫装备有限公司 | Control method and device of permanent magnet synchronous motor, storage medium and processor |
| CN113162507A (en) * | 2021-05-08 | 2021-07-23 | 佛山市威灵洗涤电机制造有限公司 | Fan control method, fan, household appliance and readable storage medium |
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| CN104779874A (en) * | 2015-03-19 | 2015-07-15 | 四川长虹电器股份有限公司 | Direct drag control method for outdoor fan of air conditioner |
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| CN105529979A (en) * | 2016-02-01 | 2016-04-27 | 四川长虹电器股份有限公司 | Closed-loop control method for motor starting speed |
| CN106849807A (en) * | 2016-12-30 | 2017-06-13 | 威灵（芜湖）电机制造有限公司 | Blower motor and its startup method and apparatus |
| CN106849807B (en) * | 2016-12-30 | 2019-03-15 | 威灵（芜湖）电机制造有限公司 | Blower motor and its starting method and apparatus |
| CN108540016A (en) * | 2018-04-28 | 2018-09-14 | 四川虹美智能科技有限公司 | A kind of startup method and device of motor |
| CN111262494A (en) * | 2020-03-12 | 2020-06-09 | 北京环卫集团环卫装备有限公司 | Control method and device of permanent magnet synchronous motor, storage medium and processor |
| CN111262494B (en) * | 2020-03-12 | 2022-04-01 | 北京环卫集团环卫装备有限公司 | Control method and device of permanent magnet synchronous motor, storage medium and processor |
| CN113162507A (en) * | 2021-05-08 | 2021-07-23 | 佛山市威灵洗涤电机制造有限公司 | Fan control method, fan, household appliance and readable storage medium |
| WO2022237059A1 (en) * | 2021-05-08 | 2022-11-17 | 佛山市威灵洗涤电机制造有限公司 | Fan control method, fan, household appliance, and readable storage medium |
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Application publication date: 20141224 |