CN110410304B - Sine wave control method for linear compressor - Google Patents
Sine wave control method for linear compressor Download PDFInfo
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- CN110410304B CN110410304B CN201810399556.0A CN201810399556A CN110410304B CN 110410304 B CN110410304 B CN 110410304B CN 201810399556 A CN201810399556 A CN 201810399556A CN 110410304 B CN110410304 B CN 110410304B
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- mover
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K33/02—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
- H02K33/10—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs wherein the alternate energisation and de-energisation of the single coil system is effected or controlled by movement of the armatures
Abstract
The invention provides a sine wave control method of a linear compressor, which comprises a dynamic control mode and comprises the following steps: in the reciprocating movement process of the mover of the linear compressor between two end positions of BDC and TDC, in a sine wave driving period, when the mover is about to move to one end position, the sine wave driving is stopped in advance, the mover waits to move to the end position, and when the positive and negative changes of the back electromotive force of the mover are detected, the current time T0 is recorded; when the mover is about to move to the other end position, the sine wave driving is stopped in advance, and when the positive and negative changes of the counter electromotive force of the mover are detected, the current time T1 is recorded; when the mover is to be moved to one of the end positions again, the sine wave drive is stopped in advance, and the current time T2 is recorded when a positive-negative change in the counter electromotive force of the mover is detected. More accurate mover position information is acquired, so that the control precision and the use reliability of the linear compressor are improved.
Description
Technical Field
The invention relates to a compressor, in particular to a sine wave control method of a linear compressor.
Background
At present, the compressors used in the refrigeration equipment are of a rotary type and a linear type, and the linear compressor generally comprises a shell, a stator, a coil, a rotor, a piston, a cylinder, a spring rear baffle, a spring and other parts; the rotor is provided with a magnet, the magnet is inserted into a magnetic field space formed by the stator, a coil is arranged in the stator, one end of the piston is connected to the rotor, and the other end of the piston is inserted into an inner cavity of the cylinder. In the using process, the coil is electrified to generate an alternating magnetic field to drive the rotor to drive the piston to reciprocate at a high frequency, after the linear compressor operates stably, the linear compressor works at a resonance frequency, the resonance frequency can also change under the condition that the operation parameters of the linear compressor are different, and the resonance frequency in different states can be easily obtained by a method for detecting the resonance frequency in the prior control technology. And limited by the operation principle of the linear compressor, the efficiency of the linear compressor is not always increased linearly while the power of the linear compressor is increased, and since the effective stroke of the piston is constant, the efficiency of the linear compressor is highest when the piston moves to the maximum stroke position during the reciprocating movement of the piston, and the maximum stroke position of the piston comprises a Top Dead Center (TDC) and a Bottom Dead Center (BDC). Chinese patent No. CN2004800438877 discloses a linear compressor control apparatus and a control method thereof, which controls a linear compressor by a full-stroke sine wave control manner, i.e. a quasi-sine drive is performed between two end points of radial reciprocating motion, TDC and BDC. For the linear compressor controlled by sine wave, the position estimation information of the mover is very important because the moving magnetic field of the linear compressor is not uniform, when the relative positions of the mover and the stator are different, the magnetic field intensity is different (called as a motor coefficient alpha), and the calculation related to the magnetic field intensity needs the exact position of the mover. There are various ways to estimate the mover position in the prior art, for example: the counter electromotive voltage, the running current and the like of the motor in the drive intermission period are sampled, and the position and the like of the press mover are calculated by calculating the phase angle of the sampled voltage and current. However, the above method is complex in calculation, and the sampling driving interval is short, and the voltage and current waveforms are greatly affected by the oscillation of the switching device (such as an IGBT, etc.), and need to be available after sampling, so that the calculation accuracy is affected, and the control accuracy and reliability of the linear motor are low. How to design a technology for improving control precision and reliability is a technical problem to be solved by the invention.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the sine wave control method for the linear compressor is provided, so that more accurate mover position information can be acquired, and the control precision and the use reliability of the linear compressor are improved.
The technical scheme provided by the invention is that the sine wave control method of the linear compressor is characterized by comprising a dynamic control mode; the dynamic control mode includes: in the reciprocating movement process of a rotor of the linear compressor between two end positions of BDC and TDC, in a sine wave driving period, when the rotor is about to move to one end position, the sine wave driving is stopped in advance, the rotor is waited to move freely to the end position due to inertia, and when positive and negative changes of the back electromotive force of the rotor are detected, the current time T0 is recorded, and at the moment, the rotor moves reversely and carries out sine wave driving; when the mover is to move to the position of the other end point, the sine wave drive is stopped in advance, the mover is waited to move freely to the position of the end point due to inertia, the current time T1 is recorded when the positive and negative changes of the counter electromotive force of the mover are detected, and at the moment, the mover resets to move forward again and carries out the sine wave drive; when the mover is to be moved to one end position again, stopping sine wave driving in advance, waiting for the mover to freely move to the end position due to inertia, and recording the current time T2 when detecting that the counter electromotive force of the mover changes in positive and negative values;
the time of the positive half cycle of the mover motion is delta T1-T1-T0, and the estimated position of the mover in the positive half cycle of the mover motion is as follows:
the time of the negative half cycle of the rotor movement is delta T2-T2-T1, and the estimated positions of the rotor in the negative half cycle of the rotor movement are as follows:
further, the dynamic control mode specifically includes: when the mover of the linear compressor is about to run to the BDC endpoint, within the time delta 1 from the BDC endpoint, the sine wave driving is stopped, the mover is waited to freely move to the corresponding BDC endpoint due to inertia, when the counter electromotive force of the mover is detected to be changed from a positive value to a negative value, the current time T0 is recorded, and at the moment, the mover moves reversely; restarting sine wave driving after the mover leaves a BDC endpoint by delta 1 time, stopping the sine wave driving within delta 2 time from the TDC endpoint when the mover is about to run to the TDC endpoint, waiting for the mover to freely move to the TDC endpoint due to inertia, and recording the current time T1 when detecting that the back electromotive force of the mover changes from a negative value to a positive value; continuing, when the mover leaves the TDC end point for about δ 2 time, the sine wave driving is restarted, when the mover is about to move to the BDC end point again, within about δ 1 time from the BDC end point, the sine wave driving is stopped, the mover is waited to move freely to the BDC end point due to inertia, and when the free movement counter electromotive force changes from a positive value to a negative value, the current time T2 is recorded.
Further, the method further comprises an initialization mode; the initialization mode includes: after the linear compressor is electrified and started to operate, firstly, half-cycle time delta T1 and delta T2 are estimated, delta 1 is a delta T1, delta 2 is b delta T2, and a timer in the linear compressor is started; when the rotor moves towards the BDC end point, firstly applying sine wave drive with the time length of (1-a) Δ T1, and then stopping the sine wave drive, at the moment, collecting the counter electromotive force of the rotor, and resetting and restarting the timer when the counter electromotive force is changed from a positive value to a negative value; in the process that the rotor moves towards the TDC end point, the sine wave drive is restarted after the timer runs for delta 2 time, the sine wave drive is stopped after the timer runs for (1-b) delta T2 time, at the moment, the counter electromotive force of the rotor is collected, the timer is cleared and restarted when the counter electromotive force is changed from a positive value to a negative value, and meanwhile, delta T2 is updated according to the time difference of the change of the counter electromotive force positive and negative values of the rotor; in the process that the rotor moves towards the BDC end point again, the sine wave driving is restarted after the timer runs for delta 1 time, the sine wave driving is stopped after the timer runs for (1-a) delta T1 time, at the moment, the counter electromotive force of the rotor is collected, the timer is cleared and restarted when the counter electromotive force changes from a positive value to a negative value, and meanwhile, delta T1 is updated according to the time difference of the change of the counter electromotive force positive and negative values of the rotor; wherein a is more than or equal to 0.05 and less than or equal to 0.4, and b is more than or equal to 0.05 and less than or equal to 0.4.
The linear compressor sine wave control method provided by the invention controls the operation of the linear compressor by adopting a partial sine wave driving mode, does not need to sample back electromotive force voltage and current outside each carrier frequency period, does not apply driving near the end point of the movement, obtains the half-period time of the movement in a mode of freely moving the rotor, samples the back electromotive force by using a longer control interval, estimates the operation position of the motor according to the back electromotive force obtained by the free movement of the motor, so as to obtain more accurate rotor position information and improve the control precision and the use reliability of the linear compressor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A linear compressor sine wave control method comprising a dynamic control mode; the dynamic control mode includes: in the reciprocating movement process of a rotor of the linear compressor between two end positions of BDC and TDC, in a sine wave driving period, when the rotor is about to move to one end position, the sine wave driving is stopped in advance, the rotor is waited to move freely to the end position due to inertia, and when positive and negative changes of the back electromotive force of the rotor are detected, the current time T0 is recorded, and at the moment, the rotor moves reversely and carries out sine wave driving; when the mover is to move to the position of the other end point, the sine wave drive is stopped in advance, the mover is waited to move freely to the position of the end point due to inertia, the current time T1 is recorded when the positive and negative changes of the counter electromotive force of the mover are detected, and at the moment, the mover resets to move forward again and carries out the sine wave drive; when the mover is to be moved to one end position again, stopping sine wave driving in advance, waiting for the mover to freely move to the end position due to inertia, and recording the current time T2 when detecting that the counter electromotive force of the mover changes in positive and negative values;
the time of the positive half cycle of the mover motion is delta T1-T1-T0, and the estimated position of the mover in the positive half cycle of the mover motion is as follows:
the time of the negative half cycle of the rotor movement is delta T2-T2-T1, and the estimated positions of the rotor in the negative half cycle of the rotor movement are as follows:
specifically, the inductance of the coil in the linear compressor is small, the back electromotive force is close to the sine wave, it is suitable to adopt the sine wave driving control, and the sine wave control method of the linear compressor of the present embodiment adopts partial sine wave to control the operation of the linear compressor, because the mover is at the critical point of the reciprocating motion reversing after reaching the TDC or BDC position in the reciprocating motion process between the two dead points of TDC and BDC, at this time, the applied sine wave driving impulse has small meaning to the movement of the mover, therefore, the sine wave control method of the linear compressor of the present embodiment removes the end driving quantity corresponding to the sine wave near the end position to drive the mover to move, which has little influence on the operation and output quantity of the mover, so that the back electromotive force can be sampled by using long control interval, the motor operation position can be estimated according to the back electromotive force obtained by the free motion of the motor, providing basis for position estimation under sine wave control.
Based on the principle, the sine wave driving quantity in delta time around the TDC and the BDC is abandoned, and the specific implementation process is as follows:
when the mover of the linear compressor is about to run to the BDC endpoint, within the time delta 1 from the BDC endpoint, the sine wave driving is stopped, the mover is waited to freely move to the corresponding BDC endpoint due to inertia, when the counter electromotive force of the mover is detected to be changed from a positive value to a negative value, the current time T0 is recorded, and at the moment, the mover moves reversely; restarting sine wave driving after the mover leaves a BDC endpoint by delta 1 time, stopping the sine wave driving within delta 2 time from the TDC endpoint when the mover is about to run to the TDC endpoint, waiting for the mover to freely move to the TDC endpoint due to inertia, and recording the current time T1 when detecting that the back electromotive force of the mover changes from a negative value to a positive value; at this point, the forward half-cycle time measurement is finished, and the back electromotive force value at the moment can be continuously detected in the time period without applying sine wave drive, and the detected waveform is very clean, so that the detection precision is effectively improved.
Continuing, after the mover leaves the TDC end point for about δ 2 time, restarting the sine wave driving, when the mover is about to move to the BDC end point again, within about δ 1 time from the BDC end point, stopping the sine wave driving, waiting for the mover to freely move to the BDC end point due to inertia, and when the free movement counter electromotive force changes from a positive value to a negative value, recording the current time T2; the negative half cycle time measurement is now complete.
And a partial sine wave drive control mode is adopted, so that the characteristic of sine wave quick adjustment is exerted, the position of the motor can be skillfully estimated, and a reliable basis is provided for position control of a program.
Furthermore, when the linear compressor is powered on again after being powered off, how to initialize the delta time around the TDC and BDC is also the key for determining the accuracy of the later stage, and the sine wave control method of the linear compressor of the embodiment further comprises an initialization mode; the initialization mode includes: after the linear compressor is electrified and started to operate, firstly, half-cycle time delta T1 and delta T2 are estimated, delta 1 is a delta T1, delta 2 is b delta T2, and a timer in the linear compressor is started; when the rotor moves towards the BDC end point, firstly applying sine wave drive with the time length of (1-a) Δ T1, and then stopping the sine wave drive, at the moment, collecting the counter electromotive force of the rotor, and resetting and restarting the timer when the counter electromotive force is changed from a positive value to a negative value; in the process that the rotor moves towards the TDC end point, the sine wave drive is restarted after the timer runs for delta 2 time, the sine wave drive is stopped after the timer runs for (1-b) delta T2 time, at the moment, the counter electromotive force of the rotor is collected, the timer is cleared and restarted when the counter electromotive force is changed from a positive value to a negative value, and meanwhile, delta T2 is updated according to the time difference of the change of the counter electromotive force positive and negative values of the rotor; in the process that the rotor moves towards the BDC end point again, the sine wave driving is restarted after the timer runs for delta 1 time, the sine wave driving is stopped after the timer runs for (1-a) delta T1 time, at the moment, the counter electromotive force of the rotor is collected, the timer is cleared and restarted when the counter electromotive force changes from a positive value to a negative value, and meanwhile, delta T1 is updated according to the time difference of the change of the counter electromotive force positive and negative values of the rotor; wherein a is more than or equal to 0.05 and less than or equal to 0.4, and b is more than or equal to 0.05 and less than or equal to 0.4. Specifically, when the linear compressor is powered on again after being powered off, the initialization mode is performed, so that the time lengths delta 1 and delta 2 for stopping sine wave driving of the BDC and the TDC can be effectively obtained, wherein the values a and b are selected and adjusted according to the size of the overall fluctuation of the system, when the overall fluctuation of the system is large, the ratio of delta 1 to delta 2 is properly increased, it is ensured that sampling is not influenced by system fluctuation and harmonic oscillation of a switching tube, and when the overall fluctuation of the system is small, the ratio of delta 1 to delta 2 is properly reduced, and the output quantity is increased.
The linear compressor sine wave control method provided by the invention controls the operation of the linear compressor by adopting a partial sine wave driving mode, does not need to sample back electromotive force voltage and current outside each carrier frequency period, does not apply driving near the end point of the movement, obtains the half-period time of the movement in a mode of freely moving the rotor, samples the back electromotive force by using a longer control interval, estimates the operation position of the motor according to the back electromotive force obtained by the free movement of the motor, so as to obtain more accurate rotor position information and improve the control precision and the use reliability of the linear compressor.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A linear compressor sine wave control method is characterized by comprising a dynamic control mode;
the dynamic control mode includes: in the reciprocating movement process of a rotor of the linear compressor between two end positions of BDC and TDC, in a sine wave driving period, when the rotor is about to move to one end position, the sine wave driving is stopped in advance, the rotor is waited to move freely to the end position due to inertia, and when positive and negative changes of the back electromotive force of the rotor are detected, the current time T0 is recorded, and at the moment, the rotor moves reversely and carries out sine wave driving; when the mover is to move to the position of the other end point, the sine wave drive is stopped in advance, the mover is waited to move freely to the position of the end point due to inertia, the current time T1 is recorded when the positive and negative changes of the counter electromotive force of the mover are detected, and at the moment, the mover resets to move forward again and carries out the sine wave drive; when the mover is to be moved to one end position again, stopping sine wave driving in advance, waiting for the mover to freely move to the end position due to inertia, and recording the current time T2 when detecting that the counter electromotive force of the mover changes in positive and negative values;
the time of the positive half cycle of the mover motion is delta T1-T1-T0, and the estimated position of the mover in the positive half cycle of the mover motion is as follows:
the time of the negative half cycle of the rotor movement is delta T2-T2-T1, and the estimated positions of the rotor in the negative half cycle of the rotor movement are as follows:
2. the linear compressor sine wave control method of claim 1, wherein said dynamic control mode is specifically: when the mover of the linear compressor is about to run to the BDC endpoint, within the time delta 1 from the BDC endpoint, the sine wave driving is stopped, the mover is waited to freely move to the corresponding BDC endpoint due to inertia, when the counter electromotive force of the mover is detected to be changed from a positive value to a negative value, the current time T0 is recorded, and at the moment, the mover moves reversely; restarting sine wave driving after the mover leaves a BDC endpoint by delta 1 time, stopping the sine wave driving within delta 2 time from the TDC endpoint when the mover is about to run to the TDC endpoint, waiting for the mover to freely move to the TDC endpoint due to inertia, and recording the current time T1 when detecting that the back electromotive force of the mover changes from a negative value to a positive value; continuing, when the mover leaves the TDC end point for about δ 2 time, the sine wave driving is restarted, when the mover is about to move to the BDC end point again, within about δ 1 time from the BDC end point, the sine wave driving is stopped, the mover is waited to move freely to the BDC end point due to inertia, and when the free movement counter electromotive force changes from a positive value to a negative value, the current time T2 is recorded.
3. The linear compressor sine wave control method of claim 2, further comprising an initialization mode;
the initialization mode includes: after the linear compressor is electrified and started to operate, firstly, half-cycle time delta T1 and delta T2 are estimated, delta 1 is a delta T1, delta 2 is b delta T2, and a timer in the linear compressor is started;
when the rotor moves towards the BDC end point, firstly applying sine wave drive with the time length of (1-a) Δ T1, and then stopping the sine wave drive, at the moment, collecting the counter electromotive force of the rotor, and resetting and restarting the timer when the counter electromotive force is changed from a positive value to a negative value;
in the process that the rotor moves towards the TDC end point, the sine wave drive is restarted after the timer runs for delta 2 time, the sine wave drive is stopped after the timer runs for (1-b) delta T2 time, at the moment, the counter electromotive force of the rotor is collected, the timer is cleared and restarted when the counter electromotive force is changed from a positive value to a negative value, and meanwhile, delta T2 is updated according to the time difference of the change of the counter electromotive force positive and negative values of the rotor;
in the process that the rotor moves towards the BDC end point again, the sine wave driving is restarted after the timer runs for delta 1 time, the sine wave driving is stopped after the timer runs for (1-a) delta T1 time, at the moment, the counter electromotive force of the rotor is collected, the timer is cleared and restarted when the counter electromotive force changes from a positive value to a negative value, and meanwhile, delta T1 is updated according to the time difference of the change of the counter electromotive force positive and negative values of the rotor;
wherein a is more than or equal to 0.05 and less than or equal to 0.4, and b is more than or equal to 0.05 and less than or equal to 0.4.
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| CN201810399556.0A CN110410304B (en) | 2018-04-28 | 2018-04-28 | Sine wave control method for linear compressor |
| PCT/CN2019/072910 WO2019205757A1 (en) | 2018-04-28 | 2019-01-24 | Linear compressor sine wave control method |
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| CN1253238A (en) * | 1998-11-04 | 2000-05-17 | Lg电子株式会社 | Installation and method for controlling linear compressor |
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| CN1434901A (en) * | 1999-12-23 | 2003-08-06 | 巴西压缩机股份有限公司 | Method of controlling and monitoring piston position in compressor |
| CN1846061A (en) * | 2003-09-02 | 2006-10-11 | 菲舍尔和佩克尔应用有限公司 | Linear motor controller improvements |
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| US6913933B2 (en) * | 2001-12-03 | 2005-07-05 | Ortho-Clinical Diagnostics, Inc. | Fluid dispensing algorithm for a variable speed pump driven metering system |
| JP2005282517A (en) * | 2004-03-30 | 2005-10-13 | Shimadzu Corp | Liquid feeding device |
| JP4851457B2 (en) * | 2004-08-30 | 2012-01-11 | エルジー エレクトロニクス インコーポレイティド | Control apparatus and control method for linear compressor |
| DE102006009259A1 (en) * | 2006-02-28 | 2007-08-30 | BSH Bosch und Siemens Hausgeräte GmbH | Closed-loop control method for linear drive e.g. linear compressor, involves moving linear drive to and fro along drive axis, where linear drive has stator, rotor and drive coil through which coil current flows |
| CN103470483B (en) * | 2013-09-10 | 2016-01-06 | 广东美芝制冷设备有限公司 | The controlling method of compressor and control system |
| CN103457425A (en) * | 2013-09-12 | 2013-12-18 | 安鲁荣 | Magnetic field positioning linear compressor |
| KR102115247B1 (en) * | 2013-12-19 | 2020-05-26 | 엘지전자 주식회사 | Apparatus and method for controlling a linear compressor |
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|---|---|---|---|---|
| CN1324515A (en) * | 1998-09-16 | 2001-11-28 | 艾尔克塞尔公司 | Frequency control of linear motor |
| CN1253238A (en) * | 1998-11-04 | 2000-05-17 | Lg电子株式会社 | Installation and method for controlling linear compressor |
| CN1434901A (en) * | 1999-12-23 | 2003-08-06 | 巴西压缩机股份有限公司 | Method of controlling and monitoring piston position in compressor |
| CN1846061A (en) * | 2003-09-02 | 2006-10-11 | 菲舍尔和佩克尔应用有限公司 | Linear motor controller improvements |
| CN1948755A (en) * | 2005-10-14 | 2007-04-18 | 三星电子株式会社 | A compressor and a driving method thereof |
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| CN110410304A (en) | 2019-11-05 |
| WO2019205757A1 (en) | 2019-10-31 |
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