CN111342739A - Sewing machine and control method and system for quick deceleration of motor of sewing machine - Google Patents
Sewing machine and control method and system for quick deceleration of motor of sewing machine Download PDFInfo
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- CN111342739A CN111342739A CN202010186629.5A CN202010186629A CN111342739A CN 111342739 A CN111342739 A CN 111342739A CN 202010186629 A CN202010186629 A CN 202010186629A CN 111342739 A CN111342739 A CN 111342739A
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- phase
- deceleration
- lower tube
- tube
- pulse width
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/10—Electrical or electromagnetic drives
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/20—Controlling the acceleration or deceleration
Abstract
The application discloses a control method for motor rapid deceleration, which comprises the following steps: after receiving a deceleration instruction, entering a first deceleration mode for controlling the motor according to a preset electrifying sequence, wherein in each electrifying sequence period in the first deceleration mode, an inverter circuit connected with the motor has six switching states; in a first switching state, the phase A upper tube and the phase A lower tube adopt pulse width complementary modulation, the phase B lower tube is normally open, and the rest switching tubes are normally closed; in a second switching state, the phase A upper tube and the phase A lower tube adopt pulse width complementary modulation, the phase C lower tube is normally open, and the rest switching tubes are normally closed; and under the first speed reduction mode, when the bus voltage is detected to be greater than a preset voltage threshold value, entering a second speed reduction mode for short-circuiting the three-phase lower pipe. By applying the scheme of the application, the cost is not increased, and the speed reduction time of the motor is effectively shortened. The application also discloses a sewing machine and a control system for the motor to rapidly decelerate, and the control system has a corresponding effect.
Description
Technical Field
The invention relates to the technical field of sewing, in particular to a sewing machine and a control method and a system for quick deceleration of a motor of the sewing machine.
Background
With the continuous development of science and technology, the performance requirements of users on products are higher and higher. In the case of a sewing machine, it is required that the rotational speed of the sewing machine can respond quickly to the change of the foot signal at the time of deceleration. Some high-end sewing machines usually adopt sine wave control and have cement resistors, and such sewing machines can control and output a set reverse current when decelerating, so that the motor speed is rapidly reduced, and the bus energy can be released through the cement resistors to achieve the purpose of rapid deceleration, but the cost of such a scheme is very high.
There are also a large number of sewing machines with low cost, and a control system of three-phase and six-beat is adopted, so that the set reverse current cannot be controlled and output, and a cement resistor is not usually arranged for discharging. The three-phase six-beat control mode adopted by the motors is as follows: PWM modulation is carried out on a single-phase upper tube, and a single lower tube is normally open. Referring to fig. 1, in the operation process of the motor, current flows in from the modulated IGBT, passes through the motor, and then flows out from the normally open IGBT, and power is always supplied to the motor from the outside in the whole process, and energy can only be consumed through mechanical friction during deceleration, although the cost is low, the problem of slow deceleration exists.
In summary, how to effectively perform fast speed reduction of a motor without increasing the cost is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a sewing machine and a control method and a control system for the quick deceleration of a motor thereof, so as to effectively perform the quick deceleration of the motor on the premise of not increasing the cost.
In order to solve the technical problems, the invention provides the following technical scheme:
a control method for rapid deceleration of a motor comprises the following steps:
after receiving a deceleration instruction, entering a first deceleration mode for controlling the motor according to a preset electrifying sequence, wherein in each electrifying sequence period in the first deceleration mode, an inverter circuit connected with the motor has six switching states; in a first switching state, the phase A upper tube and the phase A lower tube adopt pulse width complementary modulation, the phase B lower tube is normally open, and the rest switching tubes are normally closed; in a second switching state, the phase A upper tube and the phase A lower tube adopt pulse width complementary modulation, the phase C lower tube is normally open, and the rest switching tubes are normally closed; in a third switch state, the phase B upper tube and the phase B lower tube adopt pulse width complementary modulation, the phase C lower tube is normally open, and the rest switch tubes are normally closed; in a fourth switching state, the phase B upper tube and the phase B lower tube adopt pulse width complementary modulation, the phase A lower tube is normally open, and the rest switching tubes are normally closed; in a fifth switching state, pulse width complementary modulation is adopted between the C-phase upper tube and the C-phase lower tube, the A-phase lower tube is normally open, and the rest switching tubes are normally closed; in a sixth switching state, the pulse width complementary modulation is adopted between the C-phase upper tube and the C-phase lower tube, the B-phase lower tube is normally open, and the rest switching tubes are normally closed;
and under the first deceleration mode, when the bus voltage is detected to be greater than a preset voltage threshold value, entering a second deceleration mode for short-circuiting the three-phase lower pipe.
Preferably, in each switching state of the first deceleration mode, the duty cycle of the conduction duration of the upper tube adopting pulse width complementary modulation is equal to a value calculated according to a closed-loop feedback control algorithm.
Preferably, the closed-loop feedback control algorithm is a PI control algorithm.
Preferably, in each switching state of the first deceleration mode, the on-time duty ratio of the upper tube adopting pulse width complementary modulation is equal to the first parameter value input by the user.
Preferably, in the first deceleration mode, when it is detected that the bus voltage is greater than a preset voltage threshold, the entering of the second deceleration mode for short-circuiting the three-phase lower tube includes:
and when the feedback speed of the motor is greater than the instruction speed carried in the deceleration instruction and the bus voltage is detected to be greater than a preset voltage threshold value, entering a second deceleration mode of short-circuiting the three-phase lower pipe.
A control system for rapid deceleration of an electric motor comprising:
the first speed reduction unit is used for entering a first speed reduction mode for controlling the motor according to a preset electrifying sequence after receiving a speed reduction command, and the inverter circuit has six switching states in each electrifying sequence period in the first speed reduction mode; in a first switching state, the phase A upper tube and the phase A lower tube adopt pulse width complementary modulation, the phase B lower tube is normally open, and the rest switching tubes are normally closed; in a second switching state, the phase A upper tube and the phase A lower tube adopt pulse width complementary modulation, the phase C lower tube is normally open, and the rest switching tubes are normally closed; in a third switch state, the phase B upper tube and the phase B lower tube adopt pulse width complementary modulation, the phase C lower tube is normally open, and the rest switch tubes are normally closed; in a fourth switching state, the phase B upper tube and the phase B lower tube adopt pulse width complementary modulation, the phase A lower tube is normally open, and the rest switching tubes are normally closed; in a fifth switching state, pulse width complementary modulation is adopted between the C-phase upper tube and the C-phase lower tube, the A-phase lower tube is normally open, and the rest switching tubes are normally closed; in a sixth switching state, the pulse width complementary modulation is adopted between the C-phase upper tube and the C-phase lower tube, the B-phase lower tube is normally open, and the rest switching tubes are normally closed;
and the second deceleration unit is used for entering a second deceleration mode for short-circuiting the three-phase lower pipe in the first deceleration mode when the bus voltage is detected to be greater than a preset voltage threshold value.
Preferably, in each switching state of the first deceleration mode, the duty cycle of the conduction duration of the upper tube adopting pulse width complementary modulation is equal to a value calculated according to a closed-loop feedback control algorithm.
Preferably, in each switching state of the first deceleration mode, the on-time duty ratio of the upper tube adopting pulse width complementary modulation is equal to the first parameter value input by the user.
Preferably, the second reduction unit is specifically configured to:
and when the feedback speed of the motor is greater than the instruction speed carried in the deceleration instruction and the bus voltage is detected to be greater than a preset voltage threshold value, entering a second deceleration mode of short-circuiting the three-phase lower pipe.
A sewing machine comprises the control system for the motor to rapidly decelerate.
By applying the technical scheme provided by the embodiment of the invention, circuit devices are not changed or added, so that the hardware cost is not increased. This application has changed control mode, and is specific, with traditional single-phase top tube PWM modulation, single low tube normally open, has changed pulse width complementary modulation, the single low tube normally open control mode between single-phase top tube, low tube into. Namely, after receiving a deceleration instruction, the motor enters a first deceleration mode for controlling the motor according to a preset electrifying sequence, and in each electrifying sequence period under the first deceleration mode, an inverter circuit connected with the motor has six switching states, and each switching state adopts a mode of pulse width complementary modulation between single-phase upper and lower tubes and normally open of the single lower tube.
In the first deceleration mode, when the modulated switching tube is just switched from the lower bridge opening to the upper bridge opening, because the stator in the motor is a coil and is equivalent to an inductor, the current flowing through two ends of the inductor can not change suddenly during switching, and therefore the current can flow from GND to the bus to charge the bus. In order to prevent the bus voltage from rising too high to damage circuit devices, particularly the capacitance on the bus, in the first deceleration mode, when the bus voltage is detected to be greater than a preset voltage threshold value, the three-phase lower tube enters a second deceleration mode for short-circuiting the three-phase lower tube, so that the devices at two ends of the bus are protected. And because this application releases partial energy to the generating line, consequently can assist and slow down, compare promptly and can only pass through the mechanical friction energy consumption in the motor, this application can improve energy consumption speed.
Therefore, the scheme of the application effectively shortens the speed reduction time of the motor on the premise of not increasing the cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional motor deceleration control scheme;
FIG. 2 is a flowchart illustrating an embodiment of a method for controlling a motor to decelerate quickly according to the present invention;
FIG. 3a is a schematic view of the current direction when the A-phase tube is turned on in the first switching state;
FIG. 3b is a schematic diagram of the current direction when the A-phase tube is turned on in the first switching state;
FIG. 4a is a schematic diagram of a change in bus voltage after the deceleration process is completed without entering the second deceleration mode;
FIG. 4b is a schematic diagram of the change in bus voltage after the deceleration process is completed after the second deceleration mode is entered;
fig. 5 is a schematic structural diagram of a control system for rapidly decelerating a motor according to the present invention.
Detailed Description
The core of the invention is to provide a control method for the rapid deceleration of the motor, which effectively shortens the deceleration time of the motor on the premise of not increasing the cost.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
Referring to fig. 2, fig. 2 is a flowchart illustrating an implementation of a method for controlling a motor to decelerate quickly according to the present invention, where the method for controlling the motor to decelerate quickly may include the following steps:
step S101: after receiving a deceleration instruction, entering a first deceleration mode for controlling the motor according to a preset electrifying sequence, wherein in each electrifying sequence period in the first deceleration mode, an inverter circuit connected with the motor has six switching states;
in a first switching state, the phase A upper tube and the phase A lower tube adopt pulse width complementary modulation, the phase B lower tube is normally open, and the rest switching tubes are normally closed; in a second switching state, the phase A upper tube and the phase A lower tube adopt pulse width complementary modulation, the phase C lower tube is normally open, and the rest switching tubes are normally closed; in a third switch state, the phase B upper tube and the phase B lower tube adopt pulse width complementary modulation, the phase C lower tube is normally open, and the rest switch tubes are normally closed; in a fourth switching state, the phase B upper tube and the phase B lower tube adopt pulse width complementary modulation, the phase A lower tube is normally open, and the rest switching tubes are normally closed; in a fifth switching state, pulse width complementary modulation is adopted between the C-phase upper tube and the C-phase lower tube, the A-phase lower tube is normally open, and the rest switching tubes are normally closed; in a sixth switching state, the pulse width complementary modulation is adopted between the C-phase upper tube and the C-phase lower tube, the B-phase lower tube is normally open, and the rest switching tubes are normally closed;
step S102: and under the first speed reduction mode, when the bus voltage is detected to be greater than a preset voltage threshold value, entering a second speed reduction mode for short-circuiting the three-phase lower pipe.
In the scheme of the application, after receiving the deceleration instruction, the controller enters a first deceleration mode, and in the first deceleration mode described in the application, the following are adopted: and the pulse width complementary modulation between the single-phase upper tube and the single-phase lower tube and the normally open control mode of the single-phase lower tube are adopted. For example, in a first switching state, the phase-A upper tube and the phase-A lower tube adopt pulse width complementary modulation, the phase-B lower tube is normally open, and the remaining switching tubes are normally closed; and in a second switching state, the phase A upper tube and the phase A lower tube adopt pulse width complementary modulation, the phase C lower tube is normally open, and the rest switching tubes are normally closed.
Under the normal operation of the motor and the first speed reducing mode, a three-phase six-beat control mode is adopted, namely, in each electrifying sequence period, six switch states exist in total.
In the first deceleration mode, the motor needs to be controlled according to a preset power-on sequence, that is, each switching tube in the inverter circuit is controlled, and the switching tubes are usually IGBTs. It should be noted that, in practical applications, within one energization sequence period, the switching states may change in sequence from the first switching state to the second switching state, and then sequentially change to the third switching state, the fourth switching state, the fifth switching state, and the sixth switching state. Of course, the sequence of the change of the switching states may also be adjusted according to actual conditions, that is, the sequence of the power supply may be adjusted according to actual conditions, for example, the sequence of the power supply may be adjusted according to parameters such as the specific model of the motor, the connection mode of the relevant winding, and the like, so that the motor can normally operate after the power supply is performed according to the determined sequence of the power supply.
In the first deceleration mode, the motor can release energy to the bus bar to assist in deceleration. Since there are six switch states in each power-on sequence period, the first switch state is described as an example, and the rest of the switch states are not described again.
In the first switch state, the A phase upper tube and the A phase lower tube adopt pulse width complementary modulation, the B phase lower tube is normally open, and the rest switch tubes are normally closed. Referring to fig. 3a, a schematic diagram of a current direction when the phase a tube is turned on in the first switching state is shown, and fig. 3b is a schematic diagram of a current direction when the phase a tube is turned on in the first switching state.
When the A-phase lower tube is switched to be switched to.
And because this application can be under first speed reduction mode for the bus charging, in order to prevent that the bus voltage rises to ground too high and damages circuit device, especially can damage the electric capacity on the bus, therefore, this application is under first speed reduction mode, and when detecting that bus voltage is greater than preset voltage threshold, enters into the second speed reduction mode with the short circuit of three-phase low tube. Namely, in the second deceleration mode, the lower tubes of the three phases are normally opened, the upper tubes of the three phases are normally closed, and in the second deceleration mode, the energy is not released to the bus, but consumed by the motor.
In one embodiment of the present invention, in each switching state of the first deceleration mode, the on-time duty cycle of the upper tube adopting pulse width complementary modulation is equal to a value calculated according to a closed-loop feedback control algorithm.
Under first speed reduction mode, the motor can charge for the generating line, and the length of switch on duty cycle of top tube can influence the speed of charging. And it will be appreciated that the greater the duty cycle, the faster the charging speed.
It should be noted that the on-time duty cycle of the upper tube adopting the pulse width complementary modulation means that, in the current switching state, the on-time of the upper tube occupies a proportion of the duration of the current switching state. For example, in the first switching state, the on-duration duty cycle of the tube in phase a is equal to 40%, and then the on-duration duty cycle of the tube in phase a is equal to 60%, which means that in the first switching state, 40% of the tube in phase a is on, and 60% of the tube in phase a is on, that is, the pulse width complementary modulation between the upper tube and the lower tube in the single phase is described in the foregoing.
In this embodiment, the motor is speed-controlled by a closed-loop feedback control algorithm, so that the on-time duty ratio of the upper tube adopting the pulse width complementary modulation can be equal to the value calculated by the closed-loop feedback control algorithm in each switching state of the first deceleration mode. Because the duty ratio can influence the charging speed, a user can adjust parameters in a closed-loop feedback control algorithm according to needs, so that the charging speed is adjusted, and the charging speed is suitable for actual requirements. Specifically, improve the charging speed, be favorable to realizing fast speed reduction, be favorable to reducing the consuming time of the speed reduction process of motor promptly, however, when the charging speed set up too high, bus voltage rose too fast, appeared fast and surpassed the condition of predetermineeing the voltage threshold value easily, damaged circuit even caused danger. And the scheme of this application supports the user and passes through parameter adjustment, changes the length of switch-on duty cycle of top tube to the adjustment speed of charging has just also realized the adjustment of length of time that slows down.
The specific value of the preset voltage threshold can also be set and adjusted according to actual needs, for example, it can be selected to be 400V. The closed-loop feedback control algorithm may generally be a PI control algorithm, a PID control algorithm, or the like, for ease of implementation.
In one embodiment of the present invention, in each switching state of the first deceleration mode, the on-time duty cycle of the upper tube adopting pulse width complementary modulation is equal to the first parameter value input by the user. In this embodiment, the user can adjust the duty ratio more conveniently and directly.
In an embodiment of the present invention, step S102 may specifically include:
and when the feedback speed of the motor is greater than the instruction speed carried in the deceleration instruction and the bus voltage is detected to be greater than the preset voltage threshold, entering a second deceleration mode for short-circuiting the three-phase lower pipe.
When the feedback speed of the motor is greater than the instruction speed carried in the deceleration instruction, it is indicated that the motor is decelerating currently, and if the bus voltage is less than or equal to the preset voltage threshold value, it is indicated that the motor is in the first deceleration mode currently, and correspondingly, if the bus voltage is detected to be greater than the preset voltage threshold value, the motor needs to enter a second deceleration mode for short-circuiting the three-phase lower pipe.
In practical applications, the detection may be performed periodically in general. For example, the detection is performed every 1ms, and when the feedback speed of the motor is greater than the command speed carried in the deceleration command and the bus voltage is greater than the preset voltage threshold, the second deceleration mode may be entered.
In addition, in practical applications, after entering the first deceleration mode, the second deceleration mode may be entered, or the second deceleration mode may not be entered. That is, in the first deceleration mode, the bus voltage rises, but may not exceed the preset voltage threshold, and the deceleration process is completed. For example, fig. 4a is a schematic diagram of a bus voltage change when the deceleration process is completed without entering the second deceleration mode, and fig. 4b is a schematic diagram of a bus voltage change when the deceleration process is completed after entering the second deceleration mode. Whether to enter the second deceleration mode is related to the motor speed before deceleration, the instruction speed carried in the deceleration instruction, the deceleration size in the first deceleration mode and other factors. The deceleration magnitude in the first deceleration mode described herein, i.e., the on-duration duty cycle of the upper tube with pulse-width complementary modulation in various switching states depending on the first deceleration mode.
By applying the technical scheme provided by the embodiment of the invention, circuit devices are not changed or added, so that the hardware cost is not increased. This application has changed control mode, and is specific, with traditional single-phase top tube PWM modulation, single low tube normally open, has changed pulse width complementary modulation, the single low tube normally open control mode between single-phase top tube, low tube into. Namely, after receiving a deceleration instruction, the motor enters a first deceleration mode for controlling the motor according to a preset electrifying sequence, and in each electrifying sequence period under the first deceleration mode, an inverter circuit connected with the motor has six switching states, and each switching state adopts a mode of pulse width complementary modulation between single-phase upper and lower tubes and normally open of the single lower tube.
In the first deceleration mode, when the modulated switching tube is just switched from the lower bridge opening to the upper bridge opening, because the stator in the motor is a coil and is equivalent to an inductor, the current flowing through two ends of the inductor can not change suddenly during switching, and therefore the current can flow from GND to the bus to charge the bus. In order to prevent the bus voltage from rising too high to damage circuit devices, particularly the capacitance on the bus, in the first deceleration mode, when the bus voltage is detected to be greater than a preset voltage threshold value, the three-phase lower tube enters a second deceleration mode for short-circuiting the three-phase lower tube, so that the devices at two ends of the bus are protected. And because this application releases partial energy to the generating line, consequently can assist and slow down, compare promptly and can only pass through the mechanical friction energy consumption in the motor, this application can improve energy consumption speed.
Therefore, the scheme of the application effectively shortens the speed reduction time of the motor on the premise of not increasing the cost.
Corresponding to the above method embodiment, the embodiment of the present invention further provides a control system for fast deceleration of a motor, which can be referred to in correspondence with the above.
Referring to fig. 5, a schematic structural diagram of a control system for fast decelerating a motor according to the present invention includes:
the first speed reduction unit 501 is configured to enter a first speed reduction mode in which the motor is controlled according to a preset power-on sequence after receiving a speed reduction instruction, and the inverter circuit has six switching states in each power-on sequence period in the first speed reduction mode; in a first switching state, the phase A upper tube and the phase A lower tube adopt pulse width complementary modulation, the phase B lower tube is normally open, and the rest switching tubes are normally closed; in a second switching state, the phase A upper tube and the phase A lower tube adopt pulse width complementary modulation, the phase C lower tube is normally open, and the rest switching tubes are normally closed; in a third switch state, the phase B upper tube and the phase B lower tube adopt pulse width complementary modulation, the phase C lower tube is normally open, and the rest switch tubes are normally closed; in a fourth switching state, the phase B upper tube and the phase B lower tube adopt pulse width complementary modulation, the phase A lower tube is normally open, and the rest switching tubes are normally closed; in a fifth switching state, pulse width complementary modulation is adopted between the C-phase upper tube and the C-phase lower tube, the A-phase lower tube is normally open, and the rest switching tubes are normally closed; in a sixth switching state, the pulse width complementary modulation is adopted between the C-phase upper tube and the C-phase lower tube, the B-phase lower tube is normally open, and the rest switching tubes are normally closed;
and the second deceleration unit 502 is configured to enter a second deceleration mode in which the three-phase lower tube is short-circuited in the first deceleration mode when it is detected that the bus voltage is greater than a preset voltage threshold.
In one embodiment of the present invention, in each switching state of the first deceleration mode, the on-time duty cycle of the upper tube adopting pulse width complementary modulation is equal to a value calculated according to a closed-loop feedback control algorithm.
In one embodiment of the present invention, in each switching state of the first deceleration mode, the on-time duty cycle of the upper tube adopting pulse width complementary modulation is equal to the first parameter value input by the user.
In an embodiment of the present invention, the second decelerating unit 502 is specifically configured to:
and when the feedback speed of the motor is greater than the instruction speed carried in the deceleration instruction and the bus voltage is detected to be greater than the preset voltage threshold, entering a second deceleration mode for short-circuiting the three-phase lower pipe.
Corresponding to the above method and system embodiments, the present invention further provides a sewing machine, which can be associated with the control system for rapid deceleration of the motor in any of the above embodiments, and can be referred to in correspondence with the above.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention. The principle and the implementation of the present invention are explained in the present application by using specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A control method for rapid deceleration of a motor is characterized by comprising the following steps:
after receiving a deceleration instruction, entering a first deceleration mode for controlling the motor according to a preset electrifying sequence, wherein in each electrifying sequence period in the first deceleration mode, an inverter circuit connected with the motor has six switching states; in a first switching state, the phase A upper tube and the phase A lower tube adopt pulse width complementary modulation, the phase B lower tube is normally open, and the rest switching tubes are normally closed; in a second switching state, the phase A upper tube and the phase A lower tube adopt pulse width complementary modulation, the phase C lower tube is normally open, and the rest switching tubes are normally closed; in a third switch state, the phase B upper tube and the phase B lower tube adopt pulse width complementary modulation, the phase C lower tube is normally open, and the rest switch tubes are normally closed; in a fourth switching state, the phase B upper tube and the phase B lower tube adopt pulse width complementary modulation, the phase A lower tube is normally open, and the rest switching tubes are normally closed; in a fifth switching state, pulse width complementary modulation is adopted between the C-phase upper tube and the C-phase lower tube, the A-phase lower tube is normally open, and the rest switching tubes are normally closed; in a sixth switching state, the pulse width complementary modulation is adopted between the C-phase upper tube and the C-phase lower tube, the B-phase lower tube is normally open, and the rest switching tubes are normally closed;
and under the first deceleration mode, when the bus voltage is detected to be greater than a preset voltage threshold value, entering a second deceleration mode for short-circuiting the three-phase lower pipe.
2. The method as claimed in claim 1, wherein the duty cycle of the conduction duration of the upper tube using pulse width complementary modulation is equal to the value calculated according to the closed-loop feedback control algorithm in each switching state of the first deceleration mode.
3. The method of claim 2, wherein the closed-loop feedback control algorithm is a PI control algorithm.
4. The method as claimed in claim 1, wherein the duty cycle of the conduction duration of the upper tube with complementary pulse width modulation is equal to the first parameter value inputted by the user in each switching state of the first deceleration mode.
5. The method for controlling the rapid deceleration of the motor according to claim 1, wherein in the first deceleration mode, when it is detected that the bus voltage is greater than a preset voltage threshold, entering a second deceleration mode for short-circuiting a three-phase lower tube comprises:
and when the feedback speed of the motor is greater than the instruction speed carried in the deceleration instruction and the bus voltage is detected to be greater than a preset voltage threshold value, entering a second deceleration mode of short-circuiting the three-phase lower pipe.
6. A control system for rapid deceleration of an electric motor, comprising:
the first speed reduction unit is used for entering a first speed reduction mode for controlling the motor according to a preset electrifying sequence after receiving a speed reduction command, and the inverter circuit has six switching states in each electrifying sequence period in the first speed reduction mode; in a first switching state, the phase A upper tube and the phase A lower tube adopt pulse width complementary modulation, the phase B lower tube is normally open, and the rest switching tubes are normally closed; in a second switching state, the phase A upper tube and the phase A lower tube adopt pulse width complementary modulation, the phase C lower tube is normally open, and the rest switching tubes are normally closed; in a third switch state, the phase B upper tube and the phase B lower tube adopt pulse width complementary modulation, the phase C lower tube is normally open, and the rest switch tubes are normally closed; in a fourth switching state, the phase B upper tube and the phase B lower tube adopt pulse width complementary modulation, the phase A lower tube is normally open, and the rest switching tubes are normally closed; in a fifth switching state, pulse width complementary modulation is adopted between the C-phase upper tube and the C-phase lower tube, the A-phase lower tube is normally open, and the rest switching tubes are normally closed; in a sixth switching state, the pulse width complementary modulation is adopted between the C-phase upper tube and the C-phase lower tube, the B-phase lower tube is normally open, and the rest switching tubes are normally closed;
and the second deceleration unit is used for entering a second deceleration mode for short-circuiting the three-phase lower pipe in the first deceleration mode when the bus voltage is detected to be greater than a preset voltage threshold value.
7. The system as claimed in claim 6, wherein the duty cycle of the conduction duration of the upper tube using pulse width complementary modulation is equal to the value calculated according to the closed-loop feedback control algorithm in each switching state of the first deceleration mode.
8. The control system for motor fast deceleration according to claim 6, wherein in each switching state of said first deceleration mode, the on-duration duty cycle of the upper tube with pulse width complementary modulation is equal to the first parameter value inputted by the user.
9. The control system for rapid deceleration of an electric motor according to claim 6, wherein the second deceleration unit is specifically configured to:
and when the feedback speed of the motor is greater than the instruction speed carried in the deceleration instruction and the bus voltage is detected to be greater than a preset voltage threshold value, entering a second deceleration mode of short-circuiting the three-phase lower pipe.
10. A sewing machine comprising a control system for the rapid deceleration of the motor as claimed in any one of claims 6 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010186629.5A CN111342739A (en) | 2020-03-17 | 2020-03-17 | Sewing machine and control method and system for quick deceleration of motor of sewing machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010186629.5A CN111342739A (en) | 2020-03-17 | 2020-03-17 | Sewing machine and control method and system for quick deceleration of motor of sewing machine |
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| CN103572514A (en) * | 2013-10-24 | 2014-02-12 | 卧龙电气集团股份有限公司 | Precise positioning system of industrial sewing machine and working method of precise positioning system |
| CN104969463A (en) * | 2013-01-31 | 2015-10-07 | 三菱电机株式会社 | Motor drive device |
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- 2020-03-17 CN CN202010186629.5A patent/CN111342739A/en active Pending
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| CN104969463A (en) * | 2013-01-31 | 2015-10-07 | 三菱电机株式会社 | Motor drive device |
| CN103572514A (en) * | 2013-10-24 | 2014-02-12 | 卧龙电气集团股份有限公司 | Precise positioning system of industrial sewing machine and working method of precise positioning system |
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Application publication date: 20200626 |