CN203896245U - AC motor frequency-variable controller - Google Patents
AC motor frequency-variable controller Download PDFInfo
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- CN203896245U CN203896245U CN201420305366.5U CN201420305366U CN203896245U CN 203896245 U CN203896245 U CN 203896245U CN 201420305366 U CN201420305366 U CN 201420305366U CN 203896245 U CN203896245 U CN 203896245U
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Abstract
An AC motor frequency-variable controller comprises a control power module, an interface module, a processing module, a driving module, and a power module. The control power module is used to provide control power for the processing module and the driving module. The interface module is used to receive a control signal input from outside. The processing module is used for operation processing of the control signal received by the interface module and outputs a three-phase voltage control signal. The driving module is used for conversion processing of the three-phase voltage control signal output by the processing module and outputs a three-phase rectangular-pulse driving control signal. The power module is used for power amplification of the three-phase rectangular-pulse driving control signal output by the driving module and outputs voltage/frequency-variable three-phase AC power to control an AC motor to run. With the controller, the motor can be started under a rated current, and the current is smooth without any impact.
Description
Technical Field
The utility model belongs to the frequency conversion control field, concretely relates to alternating current motor frequency conversion controller who is exclusively used in tricycle.
Background
The dc motor is a rotating electrical machine that can convert dc electrical energy into mechanical energy or convert mechanical energy into dc electrical energy, and is a motor that can convert dc electrical energy and mechanical energy into each other. When the motor is used as a motor to run, the motor is a direct current motor and converts electric energy into mechanical energy; when the generator is used as a generator, the generator is a direct current generator and converts mechanical energy into electric energy. In the conventional electric tricycle, a direct current motor is often used as a driving power.
However, the inventor of the present invention finds that the dc motor in the existing tricycle has the problem that the starting is not smooth when starting, and the starting current easily causes impact to the motor and the power grid. Therefore, it is an urgent technical problem to be solved to drive the conventional tricycle dc motor by replacing it with an ac motor and how to perform variable frequency speed control on the ac motor.
Disclosure of Invention
Replace current tricycle DC motor to AC motor who exists to prior art and drive the back, how to carry out variable frequency speed governing's technical problem to AC motor, the utility model provides an AC motor variable frequency controller who is exclusively used in tricycle.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a variable frequency controller of an alternating current motor comprises a control power module, an interface module, a processing module, a driving module and a power module; wherein,
the control power supply module is used for providing a control power supply for the processing module and the driving module;
the interface module is used for receiving a control signal input from the outside;
the processing module is used for carrying out operation processing on the control signal received by the interface module from the outside and outputting a three-phase voltage control signal;
the driving module is used for converting the three-phase voltage control signals output by the processing module and outputting three-phase rectangular pulse driving control signals;
and the power module is used for amplifying the power of the three-phase rectangular pulse drive control signal output by the drive module and outputting a three-phase alternating current power supply with variable voltage/frequency to control the alternating current motor to operate.
Compared with the prior art, the utility model provides an among the alternating current motor frequency conversion controller, control power module can add outside DC power supply processing module and drive module, power module can directly connect electric work from outside DC power supply, process processing module is right the control signal that interface module received carries out the operation and handles, drive module carries out the conversion processing with the control signal of operation back output, and the three-phase rectangular pulse drive control signal warp of will exporting power module carries out the changeable three-phase alternating current power supply control of output voltage/frequency alternating current motor operation realizes carrying out variable frequency speed control to alternating current motor. Adopt the utility model provides an after the alternating current motor frequency conversion controller, the motor just can start under only needing rated current, and the electric current is level and smooth not have the impact, has reduced the impact of starting current to motor and electric wire netting, has prolonged the life of motor, and is better than brushless direct current motor tricycle startability.
Furthermore, the interface module comprises a reversing interface module, a braking interface module and a power-assisted interface module.
The interface module further comprises an alternating current motor parameter interface module and an instrument interface module, the alternating current motor parameter interface module receives an alternating current motor parameter signal input from the outside, the alternating current motor parameter signal is output from the instrument interface module to be displayed by an external instrument, and the alternating current motor parameter signal is judged and processed by the processing module and then fed back to control the alternating current motor to operate.
Further, the ac motor frequency conversion controller further includes a sensor board, and the sensor board is configured to detect a three-phase ac current signal output to the ac motor by the power module, and input the three-phase ac current signal to the interface module.
Further, the processing module includes a judging unit and an output unit, the judging unit is configured to judge a control signal received by the interface module from the outside so as to obtain a forward signal or a backward signal, and the output unit is configured to output a corresponding control signal according to a judgment result of the judging unit.
Further, the driving module comprises a conversion unit and a driving unit, the conversion unit is used for converting the voltage of the three-phase voltage control signal, and the driving unit is used for driving and converting the voltage of the converted three-phase voltage control signal to form driving current.
Further, the power module comprises three power amplification circuits, each power amplification circuit comprises an upper bridge driving power amplification circuit, a lower bridge driving power amplification circuit and a voltage supply return circuit, the upper bridge driving power amplification circuit is used for driving an upper bridge MOS (metal oxide semiconductor) transistor, the lower bridge driving power amplification circuit is used for driving a lower bridge MOS transistor, and the voltage supply return circuit is used for returning voltage supply.
Further, the control power module comprises an electric lock, a first DC/DC converter and a second DC/DC converter; wherein,
the electric lock is connected between an external direct-current power supply and the first DC/DC converter and used for controlling the on-off of the control power supply module and the external direct-current power supply;
the first DC/DC converter is used for converting the external direct current power supply into a first voltage used by the driving module;
the second DC/DC converter is configured to convert the external direct current power source to a second voltage for use by the processing module.
Further, the alternating current motor frequency conversion controller also comprises an isolation module connected between the processing module and the driving module.
Further, the control power module comprises an electric lock, a first DC/DC converter, a second DC/DC converter, a third DC/DC converter and a fourth DC/DC converter; wherein,
the electric lock is connected between an external direct-current power supply and the first DC/DC converter and used for controlling the on-off of the control power supply module and the external direct-current power supply;
the first DC/DC converter is used for converting the external direct current power supply into a first voltage used by the driving module;
the third DC/DC converter is used for converting the first voltage into a third voltage used by the output of the isolation module;
the fourth DC/DC converter is used for converting the external direct current power supply into a fourth voltage used by the isolation module input and processing module;
the second DC/DC converter is configured to convert the fourth voltage to a second voltage for use by the processing module.
Drawings
Fig. 1 is a schematic structural diagram of an ac motor frequency conversion controller provided by the present invention.
Fig. 2 is a schematic diagram of a circuit structure in an embodiment of a power module provided by the present invention.
Fig. 3 is a schematic structural diagram of a first embodiment of a control power supply module provided in the present invention.
Fig. 4 is a schematic structural diagram of a second embodiment of a control power supply module provided in the present invention.
In the figure, 1, an alternating current motor variable frequency controller; 11. a control power supply module; 111. an electric lock; 112. a first DC/DC converter; 113. a second DC/DC converter; 114. a third DC/DC converter; 115. a fourth DC/DC converter; 12. an interface module; 13. a processing module; 14. a drive module; 15. a power module; 16. an isolation module; 2. an alternating current motor; 3. a direct current power supply.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.
Referring to fig. 1, an ac motor frequency conversion controller 1 includes a control power module 11, an interface module 12, a processing module 13, a driving module 14, and a power module 15; wherein,
the control power supply module 11 is configured to provide a control power supply for the processing module 13 and the driving module 14;
the interface module 12 is configured to receive a control signal input from the outside;
the processing module 13 is configured to perform operation processing on the control signal received by the interface module 12 from the outside, and output a three-phase voltage control signal;
the driving module 14 is configured to perform conversion processing on the three-phase voltage control signal output by the processing module 13, and output a three-phase rectangular pulse driving control signal;
the power module 15 is configured to perform power amplification on the three-phase rectangular pulse driving control signal output by the driving module 14, and output a three-phase ac power source with variable voltage/frequency to control the operation of the ac motor 2.
Compared with the prior art, the utility model provides an among the alternating current motor frequency conversion controller, control power module can add outside DC power supply processing module and drive module, power module can directly connect electric work from outside DC power supply, process processing module is right the control signal that interface module received carries out the operation and handles, drive module carries out the conversion processing with the control signal of operation back output, and the three-phase rectangular pulse drive control signal warp of will exporting power module carries out the changeable three-phase alternating current power supply control of output voltage/frequency alternating current motor operation realizes carrying out variable frequency speed control to alternating current motor. Adopt the utility model provides an after the alternating current motor frequency conversion controller, the motor just can start under only needing rated current, and the electric current is level and smooth not have the impact, has reduced the impact of starting current to motor and electric wire netting, has prolonged the life of motor, and is better than brushless direct current motor tricycle startability.
As a specific embodiment, please refer to fig. 1, the interface module 12 includes a reverse interface module, a brake interface module, and a power-assisted interface module. Specifically, the reverse interface module is configured to receive a reverse control signal input from the outside, the brake interface module is configured to receive a brake control signal input from the outside, and the boost interface module is configured to receive a boost control signal input from the outside. The reversing control signal, the braking control signal and the power assisting control signal are respectively processed by the processing module 13, the driving module 14 outputs a driving control signal after conversion processing, the power module 15 amplifies the power of the output driving control signal, and then the three-phase alternating current power supply with variable voltage/frequency is respectively output to control the alternating current motor 2 to operate; wherein, the input power-assisted (oil-filling) control signal is used for the rotation of the alternating current motor 2; the reverse control signal is used for controlling the alternating current motor 2 to rotate reversely under the control of the power-assisted control signal, and if the reverse control signal is not added, the alternating current motor 2 rotates forwards; the braking control signal is used for controlling the alternating current motor 2 not to rotate, so that the variable-frequency speed regulation control of the alternating current motor 2 is realized after operation processing according to the control signal input from the outside.
As a specific embodiment, please refer to fig. 1, the interface module 12 further includes an ac motor parameter interface module and an instrument interface module, the ac motor parameter interface module receives an ac motor parameter signal input from the outside, the ac motor parameter signal is output from the instrument interface module to be displayed by an external instrument, and the ac motor parameter signal is judged and processed by the processing module and then fed back to control the operation of the ac motor 2. Specifically, an encoder is disposed in the ac motor 2, and the encoder may perform sampling detection on parameters running in the ac motor 2, where as a specific implementation manner, the ac motor parameters include forward rotation, reverse rotation, and rotation speed of the ac motor 2. In this embodiment, the operating state of the ac motor 2 can be displayed and monitored in real time by sampling and detecting the parameters of the ac motor 2 and outputting the parameters from the meter interface module to be displayed by an external meter. Meanwhile, after the processing module 13 determines the sampling parameters of the alternating current motor, a forward or backward processing signal can be obtained, if the forward signal frequency conversion controller outputs a sequential three-phase alternating current power supply, and if the backward signal frequency conversion controller outputs an inverse sequential three-phase alternating current power supply, so that the feedback control processing of the operation of the alternating current motor 2 can be completed after the acquired parameter signals of the alternating current motor are processed.
As a specific embodiment, please refer to fig. 1, the ac motor frequency conversion controller further includes a sensor board, and the sensor board is configured to detect a three-phase ac current signal output from the power module 15 to the ac motor 2, and input the three-phase ac current signal to the interface module 12. Specifically, the sensor board is provided with three current detection units, and each current detection unit is provided with a current sensing chip, so that a three-phase alternating current signal output by the power module 15 can be sensed and detected. As a specific embodiment, the current sensing chip is a hall current sensor, so that the current change of the three-phase ac current signal output from the power module 15 to the ac motor 2 can be accurately reflected. In this embodiment, by detecting the current change of the three-phase ac current signal, the three-phase ac current signal output by the power module 5 can be adjusted so that the ac motor 2 operates at a set command speed.
As a specific embodiment, the processing module 13 includes a judging unit for judging a control signal received from the outside by the interface module 12 so as to obtain a forward signal or a backward signal, and an output unit for outputting a corresponding control signal according to a judgment result of the judging unit. Specifically, the judging unit first judges a control signal received from the outside by the interface module 12 so as to find out whether the received control signal is a forward signal or a backward signal; then, the output unit outputs a corresponding control signal according to the judgment result of the judgment unit, and if the judgment result of the judgment unit is a forward signal, the processing module outputs a sequential three-phase alternating current signal to the driving module; if the judgment result of the judgment unit is a backward signal, the processing module outputs a reverse three-phase alternating current signal to the driving module, and finally outputs a three-phase alternating current power supply to control the alternating current motor to operate. In one embodiment, the main processor in the processing module 13 is a chip of model TMS320F 28035.
As a specific embodiment, the driving module 14 includes a converting unit and a driving unit, and the converting unit is configured to convert the voltages of the three-phase voltage control signals; and the driving unit is used for driving and converting the voltage of the converted three-phase voltage control signal to form a driving current. Specifically, the driving unit comprises a driving circuit formed by a triode and a pair of transistors, when a control signal is at a low level, the base electrode potential of the bipolar triode and the pair of transistors is at a low potential, the base electrode current flowing through the NPN type triode is approximately zero, the triode is cut off, namely a large resistor is connected in series between a collector and an emitter, the current flowing through the PNP type triode rapidly reaches a saturation current, the triode is in saturation conduction, and the grid electrode of the field effect transistor is approximately grounded and cut off; when the control signal is at a high level, the base electrode potential of the bipolar transistor pair transistor is at a high potential, the base electrode current flowing through the NPN type transistor quickly reaches saturation, the transistor is in saturated conduction, the base electrode current flowing through the PNP type transistor is approximately zero, the transistor is cut off, the grid electrode potential of the field effect transistor is almost equal to + 15V, and the field effect transistor is conducted, so that the driving current is formed. In one embodiment, the driving unit in the driving module 13 is a chip with model number IR 21363S.
As a specific embodiment, referring to fig. 2, the power module 15 includes three power amplification circuits (i.e., i, ii, and iii), each power amplification circuit includes an upper bridge driving power amplification circuit, a lower bridge driving power amplification circuit, and a voltage supply return circuit, the upper bridge driving power amplification circuit is configured to drive an upper bridge MOS transistor, the lower bridge driving power amplification circuit is configured to drive a lower bridge MOS transistor, and the voltage supply return circuit is configured to return voltage supply. As the circuit structure of each path of power amplifying circuit is the same, as a specific implementation, only one embodiment of the first path of power amplifying circuit (i.e. i) will be described; specifically, the upper bridge driving power amplification circuit comprises a plurality of MOS tubes QP07-QP09 which are connected in parallel, the grid electrode of each MOS tube is connected in parallel with each other through a grid resistor R07-R09 and then connected to the output end VH of the driving unit, and the drain electrode of each MOS tube is connected in parallel with each other and then connected to an external direct current power supply (such as a storage battery); the under-bridge driving power amplification circuit comprises a plurality of MOS tubes QP19-QP21 which are connected in parallel, the grid electrode of each MOS tube is connected in parallel with the output end VL of the driving unit after passing through a grid electrode resistor R19-R21, the source electrode of each MOS tube is connected in parallel with the output end VL of the driving unit, the drain electrode of each MOS tube is connected with the source electrode of each MOS tube in the upper-bridge driving power amplification circuit in a one-to-one correspondence mode (namely QP07 → QP19, QP08 → QP20, QP09 → QP 21), a bleeder resistor R92 is connected between nodes formed by connecting the grid electrode and the source electrode of each MOS tube in parallel, and the bleeder resistor R92 is used for discharging grid charges and cutting off the MOS tubes as soon as possible; one end of the voltage supply return circuit is connected to the output end V of the driving unit, the other end of the voltage supply return circuit is used as a signal output end of the power amplification circuit, and an isolation resistor R91 is connected between the other end of the voltage supply return circuit and the grid of each MOS tube in the upper bridge driving power amplification circuit. The number of MOS tubes in the upper bridge driving power amplification circuit and the lower bridge driving power amplification circuit can be increased or decreased according to the specific condition of voltage amplification so as to meet the requirement of actual power amplification.
As a specific embodiment, the control power module 11 includes an electric lock 111, a first DC/DC converter 112, and a second DC/DC converter 113; the electric lock 111 is connected between an external direct current power supply (such as a battery) and the first DC/DC converter 112, and is configured to control on/off of the control power module 11 and the external direct current power supply; the first DC/DC converter 112 is configured to convert the external DC power into a first voltage for the driving module 14; the second DC/DC converter 113 is configured to convert the external DC power into a second voltage for the processing module 13. As a specific embodiment, the voltage of the external DC power supply is 48V, and after being converted by the first DC/DC converter 112, the obtained first voltage is 15V; after being converted by the second DC/DC converter 113, the obtained second voltage is 3.3V; of course, on the basis of the foregoing embodiments, those skilled in the art may also perform conversion according to the operating voltage requirements of the optional processing module 13 and the optional driving module 14. In this embodiment, the first DC/DC converter 112 and the second DC/DC converter 113 are used to convert the external DC power, so that the output signal can be prevented from interfering with the common line, and the chip cannot operate normally.
As a specific embodiment, the ac motor variable frequency controller 1 further includes an isolation module 16 connected between the processing module 13 and the driving module 14. In one embodiment, the isolation module is a chip with a model number of ADUM 1410. In this embodiment, an isolation module 16 is disposed between the processing module 13 and the driving module 14, and can isolate signals transmitted between the processing module 13 and the driving module 14, so as to eliminate interference and signal noise on the signals.
As a specific embodiment, the control power module 11 includes an electric lock 111, a first DC/DC converter 112, a second DC/DC converter 113, a third DC/DC converter 114, and a fourth DC/DC converter 115; the electric lock 111 is connected between an external direct current power supply (such as a battery) and the first DC/DC converter 112, and is configured to control on/off of the control power module 11 and the external direct current power supply; the first DC/DC converter 112 is configured to convert the external DC power into a first voltage for the driving module 14; the third DC/DC converter 114, for converting the first voltage into a third voltage for output by the isolation module 16; the fourth DC/DC converter 115 is configured to convert the external DC power into a fourth voltage for the input of the isolation module 16 and the processing module 13; the second DC/DC converter 113 is configured to convert the fourth voltage into a second voltage for the processing module 13 to use. As a specific embodiment, the voltage of the external direct current power supply is 48V, and after the external direct current power supply is converted by the first DC/DC converter, the obtained first voltage is 15V; after the conversion by the third DC/DC converter, the obtained third voltage is 5V; after the fourth DC/DC converter converts, the obtained fourth voltage is 5V; after the conversion by the second DC/DC converter, the obtained second voltage is 3.3V; of course, on the basis of the foregoing embodiments, those skilled in the art may also perform conversion according to the operating voltage requirements of the optional processing module 13, the isolation module 16 and the driving module 14. In this embodiment, the first DC/DC converter 112 is used to convert the external DC power, the third DC/DC converter 114 is used to convert the voltage converted by the first DC/DC converter 114, the fourth DC/DC converter 115 is used to convert the external DC power, and the second DC/DC converter 113 is used to convert the voltage converted by the fourth DC/DC converter 115, so that the external DC power can be converted into a power supply voltage that the module can normally work; meanwhile, the processing module 13 and the driving module 14 are obtained by converting an external direct current power supply through a DC/DC converter, so that the working power supply can be well isolated to prevent signal interference.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (10)
1. The alternating current motor variable frequency controller is characterized by comprising a control power supply module, an interface module, a processing module, a driving module and a power module; wherein,
the control power supply module is used for providing a control power supply for the processing module and the driving module;
the interface module is used for receiving a control signal input from the outside;
the processing module is used for carrying out operation processing on the control signal received by the interface module from the outside and outputting a three-phase voltage control signal;
the driving module is used for converting the three-phase voltage control signals output by the processing module and outputting three-phase rectangular pulse driving control signals;
and the power module is used for amplifying the power of the three-phase rectangular pulse drive control signal output by the drive module and outputting a three-phase alternating current power supply with variable voltage/frequency to control the alternating current motor to operate.
2. The ac motor variable frequency controller of claim 1, wherein the interface module comprises a reverse interface module, a brake interface module, and a boost interface module.
3. The ac motor variable frequency controller according to claim 2, wherein the interface module further comprises an ac motor parameter interface module and an instrument interface module, the ac motor parameter interface module receives an ac motor parameter signal inputted from the outside, the ac motor parameter signal is outputted from the instrument interface module for an external instrument to display, and the ac motor parameter signal is judged and processed by the processing module to feedback control the operation of the ac motor.
4. The ac motor inverter controller of claim 2, further comprising a sensor board for sensing a three-phase ac current signal output by the power module to the ac motor and inputting the three-phase ac current signal to the interface module.
5. The ac motor inverter controller according to claim 1, wherein the processing module comprises a judging unit for judging the control signal received from the outside by the interface module to obtain a forward signal or a backward signal, and an output unit for outputting a corresponding control signal according to the judgment result of the judging unit.
6. The ac motor frequency conversion controller according to claim 1, wherein the driving module comprises a converting unit and a driving unit, the converting unit is configured to convert the voltages of the three-phase voltage control signals, and the driving unit is configured to perform driving conversion on the converted voltages of the three-phase voltage control signals to form a driving current.
7. The ac motor inverter controller of claim 1, wherein the power module comprises three power amplifier circuits, each power amplifier circuit comprising an upper bridge driving power amplifier circuit for driving an upper bridge MOS transistor, a lower bridge driving power amplifier circuit for driving a lower bridge MOS transistor, and a voltage supply return circuit for returning the voltage supply.
8. The ac motor variable frequency controller of claim 1, wherein the control power module comprises an electric lock, a first DC/DC converter, and a second DC/DC converter; wherein,
the electric lock is connected between an external direct-current power supply and the first DC/DC converter and used for controlling the on-off of the control power supply module and the external direct-current power supply;
the first DC/DC converter is used for converting the external direct current power supply into a first voltage used by the driving module;
the second DC/DC converter is configured to convert the external direct current power source to a second voltage for use by the processing module.
9. The ac motor variable frequency controller of claim 1, further comprising an isolation module coupled between the processing module and the drive module.
10. The ac motor variable frequency controller of claim 9, wherein the control power module includes an electric lock, a first DC/DC converter, a second DC/DC converter, a third DC/DC converter, and a fourth DC/DC converter; wherein,
the electric lock is connected between an external direct-current power supply and the first DC/DC converter and used for controlling the on-off of the control power supply module and the external direct-current power supply;
the first DC/DC converter is used for converting the external direct current power supply into a first voltage used by the driving module;
the third DC/DC converter is used for converting the first voltage into a third voltage used by the output of the isolation module;
the fourth DC/DC converter is used for converting the external direct current power supply into a fourth voltage used by the isolation module input and processing module;
the second DC/DC converter is configured to convert the fourth voltage to a second voltage for use by the processing module.
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| CN201420305366.5U CN203896245U (en) | 2014-06-10 | 2014-06-10 | AC motor frequency-variable controller |
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| CN201420305366.5U CN203896245U (en) | 2014-06-10 | 2014-06-10 | AC motor frequency-variable controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009701A (en) * | 2014-06-10 | 2014-08-27 | 重庆市科诚电机制造有限公司 | Variable frequency controller for alternating current motor |
| WO2023122886A1 (en) * | 2021-12-27 | 2023-07-06 | 西门子股份公司 | Voltage converter control apparatus, method and system |
-
2014
- 2014-06-10 CN CN201420305366.5U patent/CN203896245U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009701A (en) * | 2014-06-10 | 2014-08-27 | 重庆市科诚电机制造有限公司 | Variable frequency controller for alternating current motor |
| WO2023122886A1 (en) * | 2021-12-27 | 2023-07-06 | 西门子股份公司 | Voltage converter control apparatus, method and system |
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