CN109245659B - Method and system for controlling switched reluctance motor, controller and cook machine - Google Patents
Method and system for controlling switched reluctance motor, controller and cook machine Download PDFInfo
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- CN109245659B CN109245659B CN201811038328.7A CN201811038328A CN109245659B CN 109245659 B CN109245659 B CN 109245659B CN 201811038328 A CN201811038328 A CN 201811038328A CN 109245659 B CN109245659 B CN 109245659B
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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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/08—Reluctance motors
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Abstract
The invention is suitable for the technical field of motors, and provides a method, a system, a controller and a cook machine for controlling a switched reluctance motor, wherein the method comprises the following steps: acquiring level maintaining time of a position signal of a position sensor, and taking the level maintaining time as motor commutation reference time T; switching the switched reluctance motor to the next phase and maintaining the power-on time to be T1, wherein T1 is half of the motor phase change reference time T; continuing to switch the switched reluctance motor to the next phase, turning over the level of a position signal electrified to the position sensor, and recording the electrifying time as t 2; and updating the motor commutation reference time T to T1+ T2, and continuously controlling the switched reluctance motor to work. According to the embodiment of the invention, the motor is controlled by combining the prepositioning of the starting phase and the rotating magnetic field through the single position sensor, so that the assembly difficulty and the assembly cost are reduced.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a method, a system, a controller and a cook machine for controlling a switched reluctance motor.
Background
The switch reluctance motor speed regulating system is the latest generation stepless speed regulating system developed after the frequency conversion speed regulating system and the brushless DC motor speed regulating system, is an optical, mechanical and electrical integration high and new technology integrating the modern microelectronic technology, digital technology, power electronic technology, infrared photoelectric technology, modern electromagnetic theory, design and manufacture technology, and has the advantages that the speed regulating system has DC and AC speed regulating systems. The switched reluctance motor has the advantages of simple structure, reliable performance, large starting torque, wide speed regulation range, high efficiency and the like, and is widely applied to the fields of household appliances, aviation, aerospace, electronics, machinery, electric vehicles and the like.
In the prior art, two or more position sensors are needed for controlling the switched reluctance motor, the position deviation between the position sensors can bring adverse effects to the performance of the motor in the manufacturing and assembling processes, so that the assembling difficulty is increased, and the cost is increased because one switched reluctance motor needs to be provided with a plurality of position sensors.
In summary, the technical problems of high cost and difficult assembly of the position sensor of the switched reluctance motor exist in the prior art.
Disclosure of Invention
The embodiment of the invention provides a method for controlling a switched reluctance motor, aiming at solving the problem that the switched reluctance motor needs a plurality of position sensors.
The embodiment of the invention is realized in such a way that a method for controlling a switched reluctance motor comprises the following steps:
acquiring level maintaining time of a position signal of the position sensor, and taking the level maintaining time as motor commutation reference time T;
switching the switched reluctance motor to a next phase and maintaining a power-on time of T1, wherein the T1 is half of the motor commutation reference time T;
continuing to switch the switched reluctance motor to the next phase, turning over the level of a position signal electrified to the position sensor, and recording the electrifying time as t 2;
and updating the motor commutation reference time T to T1+ T2, and continuously controlling the switched reluctance motor to work.
Still further, the method further comprises: and starting the switched reluctance motor.
Still further, the starting the switched reluctance motor includes: and electrifying the switched reluctance motor for preset time in each phase, controlling the switched reluctance motor to rotate, and recording the interval time of two adjacent level upsets of the position signal of the position sensor as the level maintaining time.
Still further, the starting the switched reluctance motor includes:
determining the electrifying phase of the switched reluctance motor according to the position signal and the rotating direction of a position sensor in the switched reluctance motor and electrifying the switched reluctance motor, so that a rotor in the switched reluctance motor rotates to a preset position;
switching the switched reluctance motor to the next phase, turning over the level of a position signal electrified to the position sensor, and recording the electrifying time as t 3;
continuing to switch the switched reluctance motor to the next phase, and maintaining the power-on time to be 2t 3;
continuing to switch the switched reluctance motor to the next phase, turning over the level of a position signal electrified to the position sensor, and recording the electrifying time as t 4;
the level maintenance time for acquiring the position signal of the position sensor is 2t3+ t 4.
An embodiment of the present invention further provides a system for controlling a switched reluctance motor, including:
the acquisition module is used for acquiring the level maintaining time of the position signal of the position sensor and taking the level maintaining time as motor commutation reference time T;
a first switching module, configured to switch the switched reluctance motor to a next phase and maintain a power-on time at T1, where T1 is half of the motor phase change reference time T;
the second switching module is used for continuously switching the switched reluctance motor to the next phase, switching the level of a position signal electrified to the position sensor, and recording the electrifying time as t 2;
and the updating module is used for updating the motor commutation reference time T to T1+ T2 and continuously controlling the switched reluctance motor to work.
Still further, still include: and the starting module is used for starting the switched reluctance motor.
Still further, still include: and the strong starting unit is used for electrifying the switched reluctance motor for preset time in each phase, controlling the switched reluctance motor to rotate, and recording the interval time of two adjacent level upsets of the position signal of the position sensor as the level maintaining time.
Still further, still include: the preparation unit is used for determining the electrifying phase of the switched reluctance motor according to the position signal and the rotating direction of the position sensor in the switched reluctance motor and electrifying the switched reluctance motor to enable the rotor in the switched reluctance motor to rotate to a preset position;
the first electrifying unit is used for switching the switched reluctance motor to the next phase, the position signal level electrified to the position sensor is reversed, and the electrifying time is recorded as t 3;
the second electrifying unit is used for continuously switching the switched reluctance motor to the next phase and maintaining the electrifying time to be 2t 3;
the third electrifying unit is used for continuously switching the switched reluctance motor to the next phase, electrifying the switched reluctance motor until the level of the position signal of the position sensor is turned over, and recording the electrifying time as t 4;
a calculation unit for acquiring a level maintenance time of a position signal of the position sensor to be 2t3+ t 4.
The embodiment of the invention also provides a controller which comprises the system for controlling the switched reluctance motor.
The embodiment of the invention also provides a chef machine with the switched reluctance motor, which comprises the switched reluctance motor and a controller for controlling the switched reluctance motor to rotate, wherein the controller is the controller.
The embodiment of the invention also provides a switched reluctance motor which comprises a single switch position sensor, a rotor and a stator with even number of phases, wherein the switch position sensor is arranged on the stator.
Furthermore, the stator is provided with stator teeth corresponding to the number of phases, and the switch position sensor is arranged on any one of the stator teeth.
Further, the switch position sensor is a hall sensor or a photosensor.
The embodiment of the invention also provides a switched reluctance motor system which comprises a switched reluctance motor and a controller, wherein the switched reluctance motor comprises a single switch position sensor, a rotor and a stator with an even number of phases, the switch position sensor is arranged on the stator, the controller is respectively connected with the switch position sensor and the phase line of the switched reluctance motor, and the controller supplies power to the phase line at the corresponding position of the switched reluctance motor according to the acquired position signal of the switch position sensor.
Furthermore, the stator is provided with stator teeth corresponding to the number of phases, and the switch position sensor is arranged on any one of the stator teeth.
Further, the switch position sensor is a hall sensor or a photosensor.
The embodiment of the invention also provides a chef machine which comprises the switched reluctance motor system.
According to the embodiment of the invention, the level maintaining time of the position signal of the single position sensor is obtained as the phase change reference time of the motor, and the phase change reference time is continuously updated, so that the normal operation of the motor can be ensured only by one position sensor, the installation difficulty of the position sensor is reduced, and the manufacturing cost of the motor is saved.
Drawings
Fig. 1 is a schematic structural diagram of a switched reluctance motor according to a fourth embodiment of the present invention;
fig. 2 is a flowchart of implementing a method for controlling a switched reluctance motor according to a sixth embodiment of the present invention;
fig. 3 is a flowchart of an implementation of a method for controlling a switched reluctance motor according to a seventh embodiment of the present invention;
fig. 4 is a diagram illustrating a variation of position signals output by the position sensor when the four-phase switched reluctance motor according to the seventh embodiment of the present invention powers on the phase-dependent switched reluctance motors;
fig. 5 is a flowchart of implementing step S10 according to the eighth embodiment of the present invention;
fig. 6 is a block diagram illustrating a system for controlling a switched reluctance motor according to a ninth embodiment of the present invention;
fig. 7 is a block diagram illustrating a system for controlling a switched reluctance motor according to a tenth embodiment of the present invention;
fig. 8 is a block diagram of a start module according to an eleventh embodiment of the present invention;
fig. 9 is a schematic diagram of a controller according to a thirteenth embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical solution of the present invention, the following description will be given by way of specific examples.
Compared with the prior art, the invention only uses one position sensor and ensures the normal operation of the switched reluctance motor through one switched position sensor.
Example one
The embodiment of the invention provides a chef machine which comprises a switched reluctance motor system, wherein the switched reluctance motor system comprises a switched reluctance motor and a controller, the controller is respectively connected with a switched position sensor and a phase line of the switched reluctance motor, and the controller supplies power to the phase line at the corresponding position of the switched reluctance motor according to an acquired position signal of the switched position sensor. The switched reluctance motor comprises a single switch position sensor, a rotor and a stator with even number of phases.
The cooker machine provided by the embodiment of the invention comprises the switched reluctance motor system, and the switched reluctance motor system only uses one switch position sensor, so that the assembly cost and the assembly difficulty of the cooker machine are reduced.
Example two
The embodiment of the invention provides a switched reluctance motor system which comprises a switched reluctance motor and a controller, wherein the controller is respectively connected with a switch position sensor and a phase line of the switched reluctance motor, and the controller supplies power to the phase line at the corresponding position of the switched reluctance motor according to a collected position signal of the switch position sensor.
Only one switch position sensor is installed in the embodiment, so that the assembly difficulty and the cost are reduced; in addition, the position signals of the switch position sensors acquired by the controller supply power to the phase lines at the corresponding positions of the switch reluctance motor, and the controller acquires the position signals of the switch position sensors in real time, so that the commutation time changes along with the rotation of the motor, the accuracy of the commutation time is ensured, and the normal operation of the switch reluctance motor is ensured.
EXAMPLE III
For the switched reluctance motor system, optionally, in the switched reluctance motor system, the stator of the switched reluctance motor is provided with stator teeth corresponding to the number of phases of the switched reluctance motor, and the switch position sensor is disposed on a central line of any one of the stator teeth, wherein the switch position sensor may be a hall sensor or a position sensor, which is not limited herein.
Because the switch position sensor is arranged on the central line of any one stator tooth in the embodiment, the phase change time is detected and updated by detecting the overturn of the position signal level of the switch position sensor, the normal operation of the switched reluctance motor can be ensured only by one switch position sensor, and the assembly difficulty and the cost of the switched reluctance motor are reduced
Example four
Fig. 1 is a schematic diagram of a switched reluctance motor according to an embodiment of the present invention. As shown in fig. 1, the switched reluctance motor includes a single switch position sensor 13, a rotor 11, and a stator 12 having an even number of phases.
Alternatively, the switch position sensor 13 is provided on the stator 12 described above. Further, the stator 12 and the rotor 11 of the switched reluctance motor are both in a salient pole structure, the pole numbers of the rotor 11 and the stator 12 are not equal, iron cores of the rotor 11 and the stator 12 are formed by pressing silicon steel sheets with good magnetic permeability, the iron core of the rotor 11 has no winding, and the salient pole of the stator 12 is provided with a concentrated winding. Specifically, there is a small air gap between the rotor 11 and the stator 12, and the rotor 11 can rotate freely in the stator 12.
In the embodiment, only one position sensor is adopted, so that the cost is saved and the requirement on the installation precision is reduced compared with the traditional two or more position sensors.
EXAMPLE five
For the switched reluctance motor, optionally, stator teeth corresponding to the number of phases of the switched reluctance motor are arranged on the stator 12 of the switched reluctance motor, and the switch position sensor 13 is arranged on the central line of any one of the stator teeth, wherein the switch position sensor 13 may be a hall sensor or a position sensor, which is not limited herein.
Because the switch position sensor 13 is arranged on the central line of any one stator tooth in the embodiment, the phase change time is detected and updated by detecting the overturn of the position signal level of the switch position sensor 13, the normal operation of the switched reluctance motor can be ensured only by one switch position sensor, and the assembly difficulty and the cost of the switched reluctance motor are reduced.
EXAMPLE six
Fig. 2 shows a flow of implementation of a method for controlling a switched reluctance motor according to an embodiment of the present invention, where an execution subject of the method may be a terminal device, and the switched reluctance motor in the method includes a single switch position sensor, a rotor, and a stator with an even number of phases, where the switch position sensor is disposed on the stator, and the following details are as follows:
in step S11, a level maintaining time of the position signal of the position sensor is acquired, and the level maintaining time is used as a motor commutation reference time T.
In an embodiment of the present invention, specifically, the switched reluctance motor includes a single switch position sensor, a rotor, and a stator having an even number of phases, wherein the switch position sensor is disposed on the stator. Optionally, the stator and the rotor of the switched reluctance motor are both in a salient pole structure, the number of poles of the rotor and the stator is unequal, the rotor and the stator core are formed by pressing silicon steel sheets with good magnetic conductivity, the rotor core has no winding, and the stator salient pole has a concentrated winding. Specifically, there is a small air gap between the rotor and the stator, and the rotor can rotate freely in the stator.
Optionally, the stator is provided with stator teeth corresponding to the number of phases of the switched reluctance motor, and the switch position sensor is disposed on a center line of any one of the stator teeth, wherein the switch position sensor may be a hall sensor or a photoelectric sensor, which is not limited herein.
In step S12, the switched reluctance motor is switched to the next phase and the energization time is maintained at T1, where T1 is half of the motor commutation reference time T.
In the embodiment of the present invention, optionally, the energization phase of the switched reluctance motor is switched to the next phase and is energized, and the energization time is half of the reference time T for phase change of the motor. Wherein, the motor commutation reference time is the level maintaining time of the position signal of the position sensor. Specifically, before the switched reluctance motor operates, the switched reluctance motor is powered on for a preset time in each phase to control the switched reluctance motor to rotate, and the interval time between two adjacent level upsets of the position signal of the position sensor is recorded as the level maintaining time.
And step S13, continuing to switch the switched reluctance motor to the next phase, and recording the energization time as t2 by reversing the level of the position signal of the position sensor.
In the embodiment of the present invention, optionally, after the energization time t1 is maintained, the energization phase of the switched reluctance motor is continuously switched to the next phase and the energization is performed, and when the level of the position signal of the position sensor mounted on the stator tooth of the switched reluctance motor is reversed, the time from the start of the energization to the level reversal is recorded and recorded as t 2.
And step S14, updating the motor commutation reference time T to T1+ T2, and continuing to control the operation of the switched reluctance motor.
In the embodiment of the present invention, optionally, T1 and T2 obtained in the above steps are obtained, where T1 is a half of the value of the motor phase change reference time T, and T2 is an energization time when the energization phase of the switched reluctance motor is continuously switched to the next phase and the energization is performed after the energization time T1 is maintained, and the obtained position sensor position signal level is inverted. Further, the motor commutation reference time T is updated to the sum of T1 and T2, and then steps S12 to S14 are repeated, the value of the motor commutation reference time T is updated each time steps S12 to S14 are repeated, and the motor is operated by repeating steps S12 to S14.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In this embodiment, the level maintaining time of the position signal of the single position sensor is obtained in advance by the single position sensor as the commutation reference time, and then the commutation reference time is updated in real time by the time taken for the level of the position signal obtained by the position sensor to turn over so as to obtain more accurate commutation time.
EXAMPLE seven
In this embodiment of the present invention, fig. 3 illustrates an implementation flow of a complete method for controlling a switched reluctance motor according to this embodiment of the present invention, and optionally, the method further includes:
step S10, the switched reluctance motor is started.
Before obtaining the level maintaining time of the position signal of the position sensor, the switched reluctance motor is electrified for each phase, the electrifying time is preset time, the salient pole of the traction rotor is rotated to the position with the minimum magnetic resistance through the pulling force generated by the magnetic field between the stator and the rotor, thereby controlling the switched reluctance motor to rotate, the level of the position signal of the position sensor is different when the different phases are electrified, and the interval time of two adjacent level inversions of the position signal of the position sensor is recorded as the level maintaining time, wherein the level inversions are changed from high level to low level or from low level to high level.
For example, fig. 4 shows the variation of the position signal output by the position sensor when the four-phase switched reluctance motor is energized for each phase, and the level is reversed, i.e., the level is changed from low to high, when the phase is switched from the phase B to the phase C.
In the embodiment, one level maintaining time is acquired as the commutation reference time before the level maintaining time of the position signal of the position sensor is acquired, so that the motor can be normally started when the commutation time does not start to be updated in the initial stage.
Example eight
The embodiment provides a specific implementation process for obtaining the phase-change reference time of the motor, and optionally, fig. 5 shows an implementation process for starting the switched reluctance motor in step S10:
step S101: and determining the electrified phase of the switched reluctance motor according to the position signal and the rotation direction of the position sensor in the switched reluctance motor, and electrifying the switched reluctance motor to enable the rotor in the switched reluctance motor to rotate to a preset position.
Alternatively, a position sensor mounted on the center line of the teeth of the stator of the switched reluctance motor determines a phase to be energized by acquiring a position signal and a rotation direction of the rotor, and energizes the energized phase so that the rotor reaches a predetermined position.
Step S102: switching the switched reluctance motor to the next phase, switching the power to the position signal level of the position sensor, and recording the power-on time as t 3;
step S103: continuing to switch the switched reluctance motor to the next phase, and maintaining the power-on time to be 2t 3;
step S104: continuing to switch the switched reluctance motor to the next phase, turning over the level of the position signal of the position sensor by electrifying, and recording the electrifying time as t 4;
step S105: the level maintaining time for acquiring the position signal of the position sensor is 2t3+ t 4.
Alternatively, after the rotor of the switched reluctance motor is rotated to a predetermined position, the energization phase of the switched reluctance motor is switched to the next phase and the energization is performed, and when the level of the position signal of the position sensor mounted on the stator teeth of the switched reluctance motor is inverted, the time taken from the start of the energization to the level inversion is recorded and recorded as t 3. Further, after t3 is recorded, the energization phase of the switched reluctance motor is continuously switched to the next phase and the energization is continued, and the energization time is maintained at 2t 3. Further, the energization phase of the switched reluctance motor is continuously switched to the next phase and energization is performed, and when the level of the position signal of the position sensor on the stator tooth is inverted, the time from the start of energization to the level inversion is recorded and recorded as T4, so that the level maintaining time for acquiring the position signal of the position sensor is 2T3+ T4, and the level maintaining time is used as the commutation reference time T.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Since the embodiment acquires the level maintaining time 2t3+ t4 as the commutation reference time before acquiring the level maintaining time of the position signal of the position sensor, the most accurate motor commutation reference time is acquired, and the accuracy of the following commutation is ensured.
Example nine
Fig. 6 is a block diagram illustrating a system for controlling a switched reluctance motor according to an embodiment of the present invention, in which only portions related to the embodiment of the present invention are shown for convenience of description. The system 6 for controlling a switched reluctance motor comprises: the device comprises an acquisition module 61, a first switching module 62, a second switching module 63 and an updating module 64.
The acquiring module 61 is configured to acquire a level maintaining time of a position signal of the position sensor, and use the level maintaining time as a motor commutation reference time T;
a first switching module 62, configured to switch the switched reluctance motor to a next phase and maintain an energization time T1, where T1 is a half of the motor phase change reference time T;
a second switching module 63, configured to continue to switch the switched reluctance motor to a next phase, turn over the level of the position signal of the position sensor when the switched reluctance motor is powered on, and record the power-on time as t 2;
and the updating module 64 is configured to update the motor commutation reference time T to T1+ T2, and continue to control the operation of the switched reluctance motor.
Therefore, in the embodiment of the present invention, the obtaining module 61 obtains the level maintaining time of the position signal of the single position sensor as the phase change reference time in advance, then the first switching module 62 and the second switching module 63 perform phase change and record new level turning time, and the updating module 64 updates the phase change reference time in real time to obtain more accurate phase change time.
Example ten
Fig. 7 is a complete block diagram of a system for controlling a switched reluctance motor according to an embodiment of the present invention, and optionally, the system 6 for controlling a switched reluctance motor according to an embodiment further includes:
and a starting module 60 for starting the switched reluctance motor.
Further, the starting module 60 includes:
and the strong starting unit is used for electrifying the switched reluctance motor for preset time in each phase, controlling the switched reluctance motor to rotate, and recording the interval time of two adjacent level inversions of the position signal of the position sensor as the level maintaining time.
In this embodiment, before the level maintaining time of the position signal of the position sensor is obtained, the strong start unit in the start module controls the switched reluctance motor to rotate, so that the time of two adjacent level inversions of the position signal of the position sensor is obtained as the commutation reference time, and the motor can be normally started when the commutation time is not updated yet in the initial stage.
EXAMPLE eleven
Fig. 8 shows a block diagram of a starting module 60 according to an embodiment of the present invention, and optionally, the starting module 60 in the tenth embodiment further includes:
a preparation unit 601, configured to determine an energization phase of the switched reluctance motor according to a position signal and a rotation direction of a position sensor in the switched reluctance motor, and energize the switched reluctance motor to rotate a rotor in the switched reluctance motor to a predetermined position;
a first energization unit 602, configured to switch the switched reluctance motor to a next phase, invert a level of a position signal supplied to the position sensor, and record that the energization time is t 3;
a second energization unit 603 configured to continue switching the switched reluctance motor to the next phase and maintain the energization time at 2t 3;
a third energizing unit 604, configured to continue to switch the switched reluctance motor to the next phase, turn over the level of the position signal of the position sensor when the switched reluctance motor is energized, and record the energization time as t 4;
the calculating unit 605 is configured to obtain a level maintaining time of the position signal of the position sensor to be 2t3+ t 4.
Alternatively, after the rotor of the switched reluctance motor is turned to a predetermined position by the preparation unit 601, the first energization unit 602 switches the energization phase of the switched reluctance motor to the next phase and performs energization, and when the level of the position signal of the position sensor mounted on the stator tooth of the switched reluctance motor is inverted, the time taken from the start of energization to the level inversion is recorded and recorded as t 3. Further, after t3 is recorded, the second energization unit 603 continues to switch the energization phase of the switched reluctance motor to the next phase and perform energization, and the energization time is maintained at 2t 3. Further, the third energization unit 604 switches the energization phase of the switched reluctance motor to the next phase and performs energization, and when the level of the position signal of the position sensor on the stator tooth is inverted, the time from the start of energization to the level inversion is recorded and recorded as T4, so that the level maintenance time for acquiring the position signal of the position sensor by the calculation unit 605 is 2T3+ T4, and the level maintenance time is used as the commutation reference time T.
Since the embodiment acquires the level maintaining time 2t3+ t4 as the commutation reference time before acquiring the level maintaining time of the position signal of the position sensor, the most accurate motor commutation reference time is acquired, and the accuracy of the following commutation is ensured.
Example twelve
The embodiment of the present invention provides a chef machine with a switched reluctance motor, and optionally, the chef machine with a switched reluctance motor includes the system for controlling a switched reluctance motor provided in the ninth embodiment, and includes: the device comprises an acquisition module, a first switching module, a second switching module and an updating module.
The acquisition module is used for acquiring the level maintenance time of the position signal of the position sensor and taking the level maintenance time as the motor commutation reference time T;
the first switching module is used for switching the switched reluctance motor to the next phase and maintaining the energization time to be T1, wherein T1 is half of the motor phase-change reference time T;
the second switching module is used for continuously switching the switched reluctance motor to the next phase, switching to the position signal level of the position sensor by electrifying, and recording the electrifying time as t 2;
the updating module is used for updating the motor commutation reference time T to T1+ T2 and continuously controlling the switched reluctance motor to work.
Therefore, in the embodiment of the invention, the acquisition module acquires the level maintaining time of the position signal of the single position sensor as the commutation reference time in advance, then the first switching module and the second switching module commutate and record new level overturning time, and the updating module updates the commutation reference time in real time to acquire more accurate commutation time.
The normal operation of the motor can be ensured only by one position sensor, so that the installation difficulty of the position sensor is reduced, and the manufacturing cost of the cook machine is saved.
EXAMPLE thirteen
Fig. 9 is a schematic diagram of a controller provided in an embodiment of the invention. As shown in fig. 9, the controller 9 of this embodiment includes: a processor 90, a memory 91 and a computer program 92, such as a program for controlling a switched reluctance motor, stored in the memory 91 and executable on the processor 90. The processor 90 implements the steps of the various method embodiments for controlling a switched reluctance motor described above, such as steps S11 through S14 shown in fig. 2, when executing the computer program 92. Alternatively, the processor 90 may implement the functions of the modules in the system embodiment for controlling the switched reluctance motor, such as the modules 61 to 64 shown in fig. 6, when executing the computer program 92.
Illustratively, the computer program 92 may be divided into one or more modules, which are stored in the memory 91 and executed by the processor 90 to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 92 in the controller 9. For example, the computer program 92 may be divided into an obtaining module, a first switching module, a second switching module and an updating module, and the specific functions of the modules are as follows:
the acquisition module is used for acquiring the level maintaining time of the position signal of the position sensor and taking the level maintaining time as motor commutation reference time T;
a first switching module, configured to switch the switched reluctance motor to a next phase and maintain a power-on time at T1, where T1 is a half of the phase-change reference time T of the motor;
the second switching module is used for continuously switching the switched reluctance motor to the next phase, switching the switched reluctance motor to the position signal level of the position sensor by electrifying, and recording the electrifying time as t 2;
and the updating module is used for updating the motor commutation reference time T to T1+ T2 and continuously controlling the switched reluctance motor to work.
The controller 9 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The controller may include, but is not limited to, a processor 90, a memory 91. Those skilled in the art will appreciate that fig. 9 is merely an example of the controller 9, and does not constitute a limitation of the controller 9, and may include more or less components than those shown, or combine certain components, or different components, for example, the controller may also include input-output devices, network access devices, buses, etc.
The Processor 90 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 91 may be an internal storage unit of the controller 9, such as a hard disk or a memory of the controller 9. The memory 91 may be an external storage device of the controller 9, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like provided in the controller 9. Further, the memory 91 may include both an internal storage unit of the controller 9 and an external storage device. The memory 91 is used for storing the computer program and other programs and data required by the controller 9. The above-mentioned memory 91 can also be used to temporarily store data that has been output or is to be output.
It can be seen from the above that, in this embodiment, the level maintaining time of the position signal of the single position sensor is obtained in advance as the commutation reference time, and then the commutation reference time is updated in real time by the time spent in the level inversion of the position signal obtained by the position sensor, so as to obtain more accurate commutation time, so that the normal operation of the motor can be ensured only by one position sensor, the installation difficulty of the position sensor is reduced, and the manufacturing cost of the motor is saved.
In summary, in the embodiments of the present invention, the level maintaining time of the position signal of the single position sensor is obtained as the phase-change reference time of the motor, and the phase-change reference time is continuously updated, so that only one position sensor is needed to ensure the normal operation of the motor, the installation difficulty of the position sensor is reduced, and the manufacturing cost of the motor is saved.
The above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; 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; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A method of controlling a switched reluctance machine comprising a single switch position sensor, a rotor, and an even number of phases of a stator on which the switch position sensor is disposed, the method comprising:
acquiring level maintaining time of a position signal of the position sensor, and taking the level maintaining time as motor commutation reference time T;
switching the switched reluctance motor to a next phase and maintaining a power-on time of T1, wherein the T1 is half of the motor commutation reference time T;
continuing to switch the switched reluctance motor to the next phase, turning over the level of a position signal electrified to the position sensor, and recording the electrifying time as t 2;
and updating the motor commutation reference time T to T1+ T2, and continuously controlling the switched reluctance motor to work.
2. The method of claim 1, wherein the method further comprises:
and starting the switched reluctance motor.
3. The method of claim 2, wherein the starting the switched reluctance motor comprises:
and electrifying the switched reluctance motor for preset time in each phase, controlling the switched reluctance motor to rotate, and recording the interval time of two adjacent level upsets of the position signal of the position sensor as the level maintaining time.
4. The method of claim 2, wherein the starting the switched reluctance motor specifically comprises:
determining the electrifying phase of the switched reluctance motor according to the position signal and the rotating direction of a position sensor in the switched reluctance motor and electrifying the switched reluctance motor, so that a rotor in the switched reluctance motor rotates to a preset position;
switching the switched reluctance motor to the next phase, turning over the level of a position signal electrified to the position sensor, and recording the electrifying time as t 3;
continuing to switch the switched reluctance motor to the next phase, and maintaining the power-on time to be 2t 3;
continuing to switch the switched reluctance motor to the next phase, turning over the level of a position signal electrified to the position sensor, and recording the electrifying time as t 4;
the level maintenance time for acquiring the position signal of the position sensor is 2t3+ t 4.
5. A system for controlling a switched reluctance machine including a single switch position sensor, a rotor, and a stator having an even number of phases, the switch position sensor being disposed on the stator, comprising:
the acquisition module is used for acquiring the level maintaining time of the position signal of the position sensor and taking the level maintaining time as motor commutation reference time T;
a first switching module, configured to switch the switched reluctance motor to a next phase and maintain a power-on time at T1, where T1 is half of the motor phase change reference time T;
the second switching module is used for continuously switching the switched reluctance motor to the next phase, switching the level of a position signal electrified to the position sensor, and recording the electrifying time as t 2;
and the updating module is used for updating the motor commutation reference time T to T1+ T2 and continuously controlling the switched reluctance motor to work.
6. The system of claim 5, further comprising:
and the starting module is used for starting the switched reluctance motor.
7. The system of claim 6, wherein the initiation module comprises:
and the strong starting unit is used for electrifying the switched reluctance motor for preset time in each phase, controlling the switched reluctance motor to rotate, and recording the interval time of two adjacent level upsets of the position signal of the position sensor as the level maintaining time.
8. The system of claim 6, wherein the initiation module comprises:
the preparation unit is used for determining the electrifying phase of the switched reluctance motor according to the position signal and the rotating direction of the position sensor in the switched reluctance motor and electrifying the switched reluctance motor to enable the rotor in the switched reluctance motor to rotate to a preset position;
the first electrifying unit is used for switching the switched reluctance motor to the next phase, the position signal level electrified to the position sensor is reversed, and the electrifying time is recorded as t 3;
the second electrifying unit is used for continuously switching the switched reluctance motor to the next phase and maintaining the electrifying time to be 2t 3;
the third electrifying unit is used for continuously switching the switched reluctance motor to the next phase, electrifying the switched reluctance motor until the level of the position signal of the position sensor is turned over, and recording the electrifying time as t 4;
a calculation unit for acquiring a level maintenance time of a position signal of the position sensor to be 2t3+ t 4.
9. A controller comprising the system of any one of claims 5 to 8.
10. A chef machine having a switched reluctance motor comprising a switched reluctance motor and a controller for controlling rotation of the switched reluctance motor, wherein the controller is the controller of claim 9.
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| CN201811038328.7A CN109245659B (en) | 2018-09-06 | 2018-09-06 | Method and system for controlling switched reluctance motor, controller and cook machine |
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| CN201811038328.7A CN109245659B (en) | 2018-09-06 | 2018-09-06 | Method and system for controlling switched reluctance motor, controller and cook machine |
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| CN113612410B (en) * | 2021-06-21 | 2023-12-29 | 深圳拓邦股份有限公司 | Switch reluctance motor, starting method thereof and multifunctional food processor |
| CN116317811A (en) * | 2021-12-21 | 2023-06-23 | 莱克电气股份有限公司 | Control method and device of switch reluctance motor, cooking equipment and storage medium |
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| US6107764A (en) * | 1998-10-30 | 2000-08-22 | Dana Corporation | Drive control for a switched reluctance motor |
| KR20010076914A (en) * | 2000-01-28 | 2001-08-17 | 구자홍 | Apparatus and method for driving single phase switched reluctance motor |
| CN103684117B (en) * | 2013-12-09 | 2016-08-17 | 南京航空航天大学 | A kind of heterogeneous switched reluctance motor system and driving control method thereof |
| CN108462415A (en) * | 2018-02-09 | 2018-08-28 | 苏州仙崴机电有限公司 | A kind of switched reluctance machines position information detection method based on single location sensor |
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