CN114142786A - SPIM motor drive control frequency conversion to power frequency hot switching method, system and control terminal - Google Patents
SPIM motor drive control frequency conversion to power frequency hot switching method, system and control terminal Download PDFInfo
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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
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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
- H02P25/04—Single phase motors, e.g. capacitor motors
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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
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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
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/01—Asynchronous machines
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Abstract
The invention provides a hot switching method, a hot switching system and a hot switching control terminal for switching from SPIM motor drive control frequency conversion to power frequency, wherein the hot switching control terminal comprises the following steps: when the first switch is closed and the second switch is opened, receiving a hot switching instruction from frequency conversion to power frequency; adjusting the rotating speed of the SPIM motor until the output electric frequency of the first inverter unit and the second inverter unit is consistent with the input alternating current frequency; adjusting the output voltage of the frequency converter to make the effective value of the voltage fundamental wave of the main winding consistent with the effective value of the voltage of the input alternating current; adjusting output voltage phases of the first inversion unit and the second inversion unit to make the voltage phase of the main winding consistent with the voltage phase of the input alternating current; and controlling the first switch to be opened and the second switch to be closed. The SPIM motor drive control frequency conversion to power frequency hot switching method, system and control terminal can realize hot switching of frequency conversion control and power frequency control.
Description
Technical Field
The invention relates to drive control of a Single Phase Induction Motor (SPIM), in particular to a method, a system and a control terminal for hot switching from variable frequency to power frequency of the SPIM Motor drive control.
Background
SPIM motors refer to asynchronous motors that use a single phase AC power supply. The SPIM motor has the advantages of convenient use, wide application, simple structure, low cost, low noise, small interference to a radio system and the like because only single-phase alternating current is needed, so the SPIM motor is commonly used in household appliances with low power and small power machines, such as electric fans, washing machines, refrigerators, air conditioners, range hoods, electric drills, medical instruments, small fans, household water pumps and the like.
In the prior art, a SPIM motor is generally composed of a stator, a rotor, a bearing, a casing, an end cover and the like. Because the output power is not large, the rotor of the SPIM motor usually adopts a squirrel-cage rotor, and the stator is provided with a set of working windings called as Main windings (M windings for short), which can only generate positive and negative alternating pulsating magnetic fields in the air gap of the motor, but can not generate a rotating magnetic field, so that the starting torque can not be generated. In order to generate a rotating magnetic field in the air gap of the motor, an auxiliary winding (Aux, abbreviated as a winding) is also required on the stator. Because the magnetic field generated by the auxiliary winding and the magnetic field of the main winding are combined in the air gap of the motor to generate a rotating magnetic field, the motor generates starting torque, so that the rotor can rotate by itself.
When the SPIM motor adopts power electronic devices, the SPIM motor has the advantages of small starting current, stable flux linkage control, small fluctuation of rotating speed and torque, small energy loss, stable rotating speed control and the like. However, all of the energy of the SPIM motor comes from the drive, resulting in the drive needing to withstand the full motor power.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide a method, a system, and a control terminal for hot-switching from variable frequency to power frequency for driving and controlling a SPIM motor, which can realize hot-switching between variable frequency control and power frequency control, and only part of energy required by the SPIM motor needs to be provided by an inverter unit under power frequency control, and part of energy is provided by a power grid.
In order to achieve the above and other related objects, the present invention provides a method for hot switching from a driving control frequency to a power frequency of a SPIM motor, which is applied to a control terminal of a SPIM driving control circuit, wherein the SPIM driving control circuit comprises a rectifying unit, a dc bus, a first inverting unit, a second inverting unit, an input ac, a first switch, a second switch, a capacitor and a control terminal; the rectification unit is connected with the direct current bus, the direct current bus is respectively connected with the first inversion unit and the second inversion unit, and the first inversion unit is connected with an auxiliary winding of the SPIM motor through a first switch; the second inverter unit is connected with a main winding of the SPIM motor; the input alternating current is connected with the auxiliary winding through a second switch and the capacitor and is connected with the input end of the rectifying unit; the control terminal is connected with the input ends of the first inversion unit and the second inversion unit and connected with the first switch and the second switch; the SPIM motor drive control frequency conversion to power frequency hot switching method comprises the following steps: under the working condition of non-power frequency, the first switch is closed, and when the second switch is opened, a hot switching instruction from frequency conversion to power frequency is received; adjusting the rotating speed of the SPIM motor until the output electric frequency of the first inverter unit and the second inverter unit is consistent with the input alternating current frequency; adjusting the output voltage of the frequency converter to make the effective value of the voltage fundamental wave of the main winding consistent with the effective value of the voltage of the input alternating current; adjusting output voltage phases of the first inversion unit and the second inversion unit to make the voltage phase of the main winding consistent with the voltage phase of the input alternating current; and controlling the first switch to be opened and the second switch to be closed.
In an embodiment of the present invention, the control terminal employs a DSP controller or a single chip microcomputer.
In an embodiment of the invention, the first inverter unit and the second inverter unit are two-level inverters, three-level inverters or multi-level inverters.
In an embodiment of the present invention, the rectification unit employs a single-phase uncontrolled rectification circuit, a single-phase PWM rectifier, a single-phase BOOST rectification circuit, a totem-pole structure rectification circuit, or a voltage-doubling rectification circuit.
The invention provides a SPIM motor drive control frequency conversion to power frequency heat switching system, which is applied to a control terminal of a SPIM drive control circuit, wherein the SPIM drive control circuit comprises a rectifying unit, a direct current bus, a first inversion unit, a second inversion unit, input alternating current, a first switch, a second switch, a capacitor and a control terminal; the rectification unit is connected with the direct current bus, the direct current bus is respectively connected with the first inversion unit and the second inversion unit, and the first inversion unit is connected with an auxiliary winding of the SPIM motor through a first switch; the second inverter unit is connected with a main winding of the SPIM motor; the input alternating current is connected with the auxiliary winding through a second switch and the capacitor and is connected with the input end of the rectifying unit; the control terminal is connected with the input ends of the first inversion unit and the second inversion unit and connected with the first switch and the second switch;
the SPIM motor drive control frequency conversion to power frequency hot switching system comprises an instruction receiving module, a frequency adjusting module, a voltage value adjusting module, a phase adjusting module and a switch control module;
the instruction receiving module is used for receiving a hot switching instruction from a frequency conversion to a power frequency when the first switch is closed and the second switch is opened;
the frequency adjusting module is used for adjusting the rotating speed of the SPIM motor until the output electric frequency of the first inverter unit and the second inverter unit is consistent with the input alternating current frequency;
the voltage value adjusting module is used for adjusting the output voltage of the frequency converter to enable the voltage fundamental wave effective value of the main winding to be consistent with the voltage effective value of the input alternating current;
the phase adjusting module is used for adjusting the output voltage phases of the first inverter unit and the second inverter unit to enable the voltage phase of the main winding to be consistent with the voltage phase of the input alternating current;
the switch control module is used for controlling the first switch to be switched off and the second switch to be switched on.
The invention provides a SPIM motor drive control frequency conversion to power frequency hot switch control terminal, comprising: a processor and a memory;
the memory is used for storing a computer program;
the processor is used for executing the computer program stored in the memory so that the SPIM motor drive control frequency conversion-to-power frequency hot switch control terminal executes the SPIM motor drive control frequency conversion-to-power frequency hot switch method.
As mentioned above, the SPIM motor drive control frequency conversion to power frequency hot switching method, system and control terminal of the invention have the following beneficial effects:
(1) when two windings of the SPIM motor are respectively controlled by the two inversion units, the variable frequency control operation of the SPIM motor can be realized; when two windings of the SPIM motor are respectively controlled by the power grid and the inversion unit, the power frequency control operation of the SPIM motor can be realized;
(2) when the rotating speed of the SPIM motor magnetic field reaches the frequency of a power grid, the hot switching of frequency conversion control and power frequency control can be realized, so that the power grid bears partial energy required by the SPIM motor, and the inverter unit bears partial energy required by the motor;
(3) the current in the switching process is small and controlled, and the voltage of the main winding is adjusted to enable the synthetic magnetic field of the auxiliary winding and the main winding to be circular, so that the loss of the motor is reduced, and the efficiency of the motor is improved; the torque and rotating speed fluctuation is smaller, so that the motor abrasion is reduced, and the service life of the motor is prolonged.
Drawings
FIG. 1 is a schematic structural diagram of a SPIM motor driving control circuit according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating an embodiment of a SPIM motor drive control variable frequency to power frequency hot-switch method of the present invention;
FIG. 3 is a schematic structural diagram of a SPIM motor drive control variable frequency to power frequency hot-switch system of the present invention in one embodiment;
fig. 4 is a schematic structural diagram of a SPIM motor drive control variable frequency to power frequency hot-switch control terminal in an embodiment of the present invention.
Description of the element reference numerals
1 rectifying unit
2 DC bus
3 first inverter unit
4 second inverter unit
5 input alternating current
6 first switch
7 second switch
8 control terminal
9 SPIM motor
91 auxiliary winding
92 main winding
31 instruction receiving module
32 frequency adjustment module
33 voltage value adjusting module
34 phase adjustment module
35 switch control module
41 processor
42 memory
c1 capacitance
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
According to the SPIM motor drive control frequency conversion to power frequency hot switching method, system and control terminal, the main winding and the auxiliary winding of the SPIM motor are respectively connected to the inversion unit, and the auxiliary winding is connected to a power grid based on the switch circuit, so that the SPIM motor has two control modes of frequency conversion control and power frequency control.
As shown in fig. 1, in an embodiment, the SPIM motor driving control circuit of the present invention includes a rectifying unit 1, a dc bus2, a first inverter unit 3, a second inverter unit 4, an input ac power 5, a first switch 6, a second switch 7, a capacitor c1, and a control terminal 8.
The rectifying unit 1 is connected to the dc bus2, and is configured to convert an input ac current Vac into a dc current, and input the dc current into the dc bus 2. Specifically, the rectifying unit 1 adopts a single-phase uncontrolled rectifying circuit, a single-phase PWM rectifier, a single-phase BOOST rectifying circuit, a totem-pole structure rectifying circuit, or a voltage-doubler rectifying circuit. Preferably, the rectifying unit 1 may adopt a two-level rectifying circuit, a three-level rectifying circuit or a multi-level rectifying circuit. In this embodiment, the input ac Vac is connected in series between two input ends of the rectifying unit 1, and two output ends are respectively connected to two ends of the dc bus 2.
The direct current bus2 is respectively connected with the first inversion unit 3 and the second inversion unit 4, and is used for inputting the direct current into the first inversion unit 3 and the second inversion unit 4. Specifically, two ends of the dc bus2 are respectively connected to two input ends of the first inverter unit 3 and the second inverter unit 4, and are configured to carry the dc power generated by the rectifier unit 1, and input the dc power to the first inverter unit 3 and the second inverter unit 4. In an embodiment of the present invention, the dc bus2 is an electrolytic capacitor or a battery.
The first inverter unit 3 is connected to the auxiliary winding 91 of the SPIM motor 9 through a first switch 6, and is configured to convert the direct current into an alternating current, and then input the alternating current to the auxiliary winding 91 through the first switch 6. Specifically, two input ends of the first inverter unit 3 are connected to two output ends of the dc bus2, and the two output ends are connected to two ends of the auxiliary winding 91 respectively after passing through the first switch 6. Therefore, when the first switch 6 is closed, the output ac power of the first inverter unit 3 can drive the auxiliary winding 91. In an embodiment of the present invention, the first inverter unit 3 is a two-level inverter, a three-level inverter, or a multi-level inverter.
The second inverter unit 4 is connected to a main winding 92 of the SPIM motor 9, and is configured to convert the direct current into an alternating current, and input the alternating current to the main winding 92. Specifically, two input ends of the second inverter unit 4 are connected to two output ends of the dc bus2, and the two output ends are respectively connected to two ends of the main winding 92, so as to drive the main winding 92. In an embodiment of the present invention, the second inverter unit 4 is a two-level inverter, a three-level inverter, or a multi-level inverter.
The input ac power 5 is connected to the auxiliary winding 91 through a second switch 7 and a capacitor c1, and is used for inputting the input ac power Vac into the auxiliary winding 91 through the second switch 7 and the capacitor c1, and simultaneously inputting the input ac power into the input end of the rectifying unit 1. In particular, the input alternating current 5 may be provided by the grid, which is connected across the auxiliary winding 91 via the second switch 7 and the capacitor c 1. Therefore, when the second switch 7 is closed, the input ac 5 drives the auxiliary winding 91 through the capacitor c 1.
The control terminal 8 is connected with the input ends of the first inverter unit 3 and the second inverter unit 4 through an IGBT pulse control Bus1, and is connected with the first switch 6 and the second switch 7 through a switch control Bus 2. Preferably, the control terminal 8 adopts a DSP controller or a single chip microcomputer.
In the starting and frequency conversion control process of the SPIM motor driving circuit, the first switch is closed, the second switch is opened, the auxiliary winding is driven by the first inversion unit, the main winding is driven by the second inversion unit, the current of the auxiliary winding is 90 degrees ahead of the current of the main winding, and the SPIM motor realizes frequency conversion operation. When the SPIM motor is required to operate at power frequency, the first switch is required to be disconnected, and the second switch is required to be closed, so that the hot switching from frequency conversion to power frequency is completed.
As shown in fig. 2, in an embodiment, the method for switching from variable frequency to power frequency hot switching of SPIM motor drive control of the present invention is applied to the control terminal, and includes the following steps:
and S1, when the first switch is closed and the second switch is opened, receiving a hot switching instruction from frequency conversion to power frequency.
Specifically, when the first switch is closed and the second switch is opened, the SPIM motor is in a variable frequency control state. And the control terminal detects whether a hot switching instruction from frequency conversion to power frequency exists.
And step S2, adjusting the rotating speed of the SPIM motor until the output electric frequency of the first inverter unit and the second inverter unit is consistent with the input alternating current frequency.
Specifically, there are various methods for adjusting the rotational speed of the SPIM motor, such as vector control, direct torque control, VF control, and the like. It should be noted that, no matter which way is adopted, the voltage frequency and the voltage amplitude of the SPIM motor are all changed, and the requirements of the motor are all met. Meanwhile, in the process of adjusting the rotating speed of the SPIM motor, the output electric frequency of the first inverter unit and the output electric frequency of the second inverter unit are adjusted.
When the rotation speed of the SPIM motor is adjusted, the output voltage of the frequency converter is also adjusted accordingly.
And step S3, adjusting the output voltage of the frequency converter to make the fundamental wave effective value of the voltage Vm of the main winding consistent with the effective value of the voltage of the input alternating current Vac.
Specifically, the output voltage of the frequency converter, i.e., the SPIM motor drive control circuit, is regulated. The inverter unit controls the output voltage of the inverter, and the output voltage of the inverter can be adjusted by adjusting the switching duty ratio of the inverter unit. If the output voltage is large, the effective value is large; when the output voltage is small, the effective value is small. Since the output voltage is a square wave, the effective value of the output voltage is the effective value of the fundamental wave.
Step S4, adjusting the output voltage phases of the first inverter unit and the second inverter unit to make the voltage Vm phase of the main winding consistent with the voltage phase of the input alternating current Vac.
Specifically, in the process of adjusting the phase of the voltage, the phases of the first inverter unit and the second inverter unit are also adjusted. Adjusting the phase of the output voltage includes the following two ways:
1) directly adjusting the phase of the output voltage, the method can cause the output voltage and the current to have a sudden change;
2) the purpose of adjusting the phase of the output voltage is achieved by slightly increasing or decreasing the rotation speed.
And step S5, controlling the first switch to be opened and the second switch to be closed.
Specifically, after the adjustment in steps S3-S5 is completed, the hot switch from the variable frequency to the power frequency of the SPIM motor may be performed, so that the control terminal sends a control command to the first switch and the second switch to open the first switch and close the second switch.
In one embodiment, the SPIM motor drive control frequency conversion to power frequency thermal switching system is applied to a control terminal of a SPIM drive control circuit, and the SPIM drive control circuit comprises a rectifying unit, a direct current bus, a first inverter unit, a second inverter unit, input alternating current, a first switch, a second switch, a capacitor c1 and a control terminal; the rectification unit is connected with the direct current bus, the direct current bus is respectively connected with the first inversion unit and the second inversion unit, and the first inversion unit is connected with an auxiliary winding of the SPIM motor through a first switch; the second inverter unit is connected with a main winding of the SPIM motor; the input alternating current is connected with the auxiliary winding through a second switch and the capacitor c1, and is connected with the input end of the rectifying unit; the control terminal is connected with the input ends of the first inversion unit and the second inversion unit and connected with the first switch and the second switch.
As shown in fig. 3, the SPIM motor drive control frequency conversion to power frequency hot-switching system includes an instruction receiving module 31, a frequency adjusting module 32, a voltage value adjusting module 33, a phase adjusting module 34, and a switch control module 35.
The instruction receiving module 31 is configured to receive a hot switching instruction from a frequency conversion to a power frequency when the first switch is turned on and the second switch is turned off.
The frequency adjusting module 32 is connected to the instruction receiving module 31, and is configured to adjust the rotation speed of the SPIM motor until the output electrical frequency of the first inverter unit and the output electrical frequency of the second inverter unit are consistent with the input alternating current electrical frequency.
The voltage value adjusting module 33 is connected to the instruction receiving module 31, and is configured to adjust the output voltage of the frequency converter, so that the effective value of the fundamental voltage of the main winding is consistent with the effective value of the voltage of the input ac.
The phase adjusting module 34 is connected to the instruction receiving module 31, and configured to adjust output voltage phases of the first inverter unit and the second inverter unit, so that a voltage phase of the main winding is consistent with a voltage phase of the input ac power.
The switch control module 35 is connected to the instruction receiving module 31, the frequency adjusting module 32, the voltage value adjusting module 33, and the phase adjusting module 34, and is configured to control the first switch to be turned off and the second switch to be turned on.
The structures and principles of the instruction receiving module 31, the frequency adjusting module 32, the voltage value adjusting module 33, the phase adjusting module 34, and the switch control module 35 correspond to the steps in the SPIM motor drive control frequency conversion to power frequency hot switching method one by one, and therefore, the description is omitted here.
It should be noted that the division of the modules of the above apparatus is only a logical division, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And these modules can be realized in the form of software called by processing element; or may be implemented entirely in hardware; and part of the modules can be realized in the form of calling software by the processing element, and part of the modules can be realized in the form of hardware. For example, the x module may be a processing element that is set up separately, or may be implemented by being integrated in a chip of the apparatus, or may be stored in a memory of the apparatus in the form of program code, and the function of the x module may be called and executed by a processing element of the apparatus. Other modules are implemented similarly. In addition, all or part of the modules can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, each step of the above method or each module above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in the form of software.
For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others. For another example, when one of the above modules is implemented in the form of a Processing element scheduler code, the Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).
As shown in fig. 4, in an embodiment, the SPIM motor driving control variable frequency to power frequency hot-switch control terminal of the present invention includes: a processor 41 and a memory 42.
The memory 42 is used for storing computer programs.
The memory 42 includes: various media that can store program codes, such as ROM, RAM, magnetic disk, U-disk, memory card, or optical disk.
The processor 41 is connected to the memory 42 and configured to execute the computer program stored in the memory 42, so that the SPIM motor drive control frequency conversion-to-power frequency hot-switch control terminal executes the SPIM motor drive control frequency conversion-to-power frequency hot-switch method.
Preferably, the Processor 41 may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; the Integrated Circuit may also be 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 device, or discrete hardware components.
In summary, the SPIM motor drive control frequency conversion to power frequency hot switching method, system and control terminal of the invention can realize the frequency conversion control operation of the SPIM motor when the two windings of the SPIM motor are respectively controlled by the two inverter units; when two windings of the SPIM motor are respectively controlled by the power grid and the inversion unit, the power frequency control operation of the SPIM motor can be realized; when the rotating speed of the SPIM motor magnetic field reaches the frequency of a power grid, the hot switching of frequency conversion control and power frequency control can be realized, so that the power grid bears partial energy required by the SPIM motor, and the inverter unit bears partial energy required by the motor; the current in the switching process is small and controlled, and the voltage of the main winding is adjusted to enable the synthetic magnetic field of the auxiliary winding and the main winding to be circular, so that the loss of the motor is reduced, and the efficiency of the motor is improved; the torque and rotating speed fluctuation is smaller, so that the motor abrasion is reduced, and the service life of the motor is prolonged. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (6)
1. A SPIM motor drive control frequency conversion to power frequency hot switching method is characterized in that: the control terminal is applied to the SPIM drive control circuit, and the SPIM drive control circuit comprises a rectifying unit, a direct-current bus, a first inversion unit, a second inversion unit, input alternating current, a first switch, a second switch, a capacitor and a control terminal; the rectification unit is connected with the direct current bus, the direct current bus is respectively connected with the first inversion unit and the second inversion unit, and the first inversion unit is connected with an auxiliary winding of the SPIM motor through a first switch; the second inverter unit is connected with a main winding of the SPIM motor; the input alternating current is connected with the auxiliary winding through a second switch and the capacitor and is connected with the input end of the rectifying unit; the control terminal is connected with the input ends of the first inversion unit and the second inversion unit and connected with the first switch and the second switch;
the SPIM motor drive control frequency conversion to power frequency hot switching method comprises the following steps:
when the first switch is closed and the second switch is opened, receiving a hot switching instruction from frequency conversion to power frequency;
adjusting the rotating speed of the SPIM motor until the output electric frequency of the first inverter unit and the second inverter unit is consistent with the input alternating current frequency;
adjusting the output voltage of the frequency converter to make the effective value of the voltage fundamental wave of the main winding consistent with the effective value of the voltage of the input alternating current;
adjusting output voltage phases of the first inversion unit and the second inversion unit to make the voltage phase of the main winding consistent with the voltage phase of the input alternating current;
and controlling the first switch to be opened and the second switch to be closed.
2. The SPIM motor drive control variable frequency to power frequency hot-switch method of claim 1, wherein: the control terminal adopts a DSP controller or a singlechip.
3. The SPIM motor drive control variable frequency to power frequency hot-switch method of claim 1, wherein: the first inversion unit and the second inversion unit adopt a two-level inverter, a three-level inverter or a multi-level inverter.
4. The SPIM motor drive control variable frequency to power frequency hot-switch method of claim 1, wherein: the rectification unit adopts a single-phase uncontrolled rectification circuit, a single-phase PWM rectifier, a single-phase BOOST rectification circuit, a totem-pole structure rectification circuit or a voltage doubling rectification circuit.
5. The utility model provides a SPIM motor drive control frequency conversion to power frequency hot switched systems which characterized in that: the control terminal is applied to the SPIM drive control circuit, and the SPIM drive control circuit comprises a rectifying unit, a direct-current bus, a first inversion unit, a second inversion unit, input alternating current, a first switch, a second switch, a capacitor and a control terminal; the rectification unit is connected with the direct current bus, the direct current bus is respectively connected with the first inversion unit and the second inversion unit, and the first inversion unit is connected with an auxiliary winding of the SPIM motor through a first switch; the second inverter unit is connected with a main winding of the SPIM motor; the input alternating current is connected with the auxiliary winding through a second switch and the capacitor and is connected with the input end of the rectifying unit; the control terminal is connected with the input ends of the first inversion unit and the second inversion unit and connected with the first switch and the second switch;
the SPIM motor drive control frequency conversion to power frequency hot switching system comprises an instruction receiving module, a frequency adjusting module, a voltage value adjusting module, a phase adjusting module and a switch control module;
the instruction receiving module is used for receiving a hot switching instruction from a frequency conversion to a power frequency when the first switch is closed and the second switch is opened;
the frequency adjusting module is used for adjusting the rotating speed of the SPIM motor until the output electric frequency of the first inverter unit and the second inverter unit is consistent with the input alternating current frequency;
the voltage value adjusting module is used for adjusting the output voltage of the frequency converter to enable the voltage fundamental wave effective value of the main winding to be consistent with the voltage effective value of the input alternating current;
the phase adjusting module is used for adjusting the output voltage phases of the first inverter unit and the second inverter unit to enable the voltage phase of the main winding to be consistent with the voltage phase of the input alternating current;
the switch control module is used for controlling the first switch to be switched off and the second switch to be switched on.
6. The utility model provides a SPIM motor drive control frequency conversion to power frequency hot switch control terminal which characterized in that: the method comprises the following steps: a processor and a memory;
the memory is used for storing a computer program;
the processor is used for executing the computer program stored in the memory so as to enable the SPIM motor drive control frequency conversion to power frequency hot switch control terminal to execute the SPIM motor drive control frequency conversion to power frequency hot switch method of any one of claims 1 to 4.
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| CN202111442041.2A CN114142786A (en) | 2021-11-30 | 2021-11-30 | SPIM motor drive control frequency conversion to power frequency hot switching method, system and control terminal |
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| CN202111442041.2A CN114142786A (en) | 2021-11-30 | 2021-11-30 | SPIM motor drive control frequency conversion to power frequency hot switching method, system and control terminal |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113241990A (en) * | 2021-06-04 | 2021-08-10 | 上海儒竞智控技术有限公司 | SPIM motor drive circuit and method |
| CN113315446A (en) * | 2021-06-04 | 2021-08-27 | 上海儒竞智控技术有限公司 | SPIM motor drive circuit and method |
| CN113315447A (en) * | 2021-06-04 | 2021-08-27 | 上海儒竞智控技术有限公司 | SPIM motor drive circuit and method |
| CN113315448A (en) * | 2021-06-04 | 2021-08-27 | 上海儒竞智控技术有限公司 | SPIM motor drive circuit and method |
| CN113315445A (en) * | 2021-06-04 | 2021-08-27 | 上海儒竞智控技术有限公司 | SPIM motor drive circuit and method |
| CN113422561A (en) * | 2021-06-04 | 2021-09-21 | 上海儒竞智控技术有限公司 | SPIM motor drive circuit and method |
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2021
- 2021-11-30 CN CN202111442041.2A patent/CN114142786A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113241990A (en) * | 2021-06-04 | 2021-08-10 | 上海儒竞智控技术有限公司 | SPIM motor drive circuit and method |
| CN113315446A (en) * | 2021-06-04 | 2021-08-27 | 上海儒竞智控技术有限公司 | SPIM motor drive circuit and method |
| CN113315447A (en) * | 2021-06-04 | 2021-08-27 | 上海儒竞智控技术有限公司 | SPIM motor drive circuit and method |
| CN113315448A (en) * | 2021-06-04 | 2021-08-27 | 上海儒竞智控技术有限公司 | SPIM motor drive circuit and method |
| CN113315445A (en) * | 2021-06-04 | 2021-08-27 | 上海儒竞智控技术有限公司 | SPIM motor drive circuit and method |
| CN113422561A (en) * | 2021-06-04 | 2021-09-21 | 上海儒竞智控技术有限公司 | SPIM motor drive circuit and method |
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