CN213754365U

CN213754365U - Intelligent controller for permanent magnet synchronous motor

Info

Publication number: CN213754365U
Application number: CN202023225006.9U
Authority: CN
Inventors: 王赔赔
Original assignee: Suzhou Qineng Electronic Technology Co ltd
Current assignee: Suzhou Qineng Electronic Technology Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-07-20
Anticipated expiration: 2030-12-28

Abstract

The utility model relates to a permanent magnet synchronous motor intelligent controller, which comprises a power supply, wherein the output end of the power supply is connected with the input end of an input filter rectification unit, the output end of the input filter rectification unit is connected with the input end of a motor through an inverter, the output end of the input filter rectification unit is connected with the input end of an auxiliary power supply, the output end of the auxiliary power supply is connected with the input end of a motor control unit, the control end of the motor control unit is connected with the controlled end of the motor, the motor control unit is mutually connected with a main control MCU, the main control MCU is mutually connected with a temperature acquisition unit, the main control MCU is mutually connected with a heat dissipation fan, the main control MCU is mutually connected with an alarm output unit, the main control MCU is mutually connected with a motor rotating speed feedback unit, the temperature acquisition unit and the heat dissipation fan, the alarm output unit and the motor rotating speed feedback unit are electrically connected with the motor. The utility model discloses can realize PMSM's drive overall control nature, ensure the security of motor.

Description

Intelligent controller for permanent magnet synchronous motor

Technical Field

The utility model relates to a PMSM intelligent control ware.

Background

In the modern society, with the development and progress of science and technology, motors have penetrated into various industries as power components. The motor is applied to factories, enterprises or families. The motor is the most commonly used power component, and approximately 70% of industrial electricity is consumed in the world. The electricity consumption is quite large.

Throughout motor applications, most are induction motors and start-stop control applications, especially in some cases the motors are still running at full speed even when starting is not necessary. This situation is extremely energy consuming and wasteful. If a motor with speed regulation control or intelligent control can be used, the energy saving is considerable.

Aiming at the technical field of frequency conversion of permanent magnet synchronous motors, two common schemes are provided, one is a 120-degree control scheme, and the other is a 180-degree scheme.

The 120-degree scheme is also called as a trapezoidal wave control scheme, the control mode is simple, the dependence on the parameters of the motor is low, but the control mode has low utilization efficiency of the motor, poor frequency characteristics, large low-frequency vibration and large high-frequency noise, and the advantages of the permanent magnet synchronous motor cannot be well exerted;

the 180-degree scheme is also called a sine wave scheme, the current of the 180-degree sine wave scheme can be continuously conducted in a 180-degree half cycle, the utilization rate of a bus is improved, and the flux-weakening control technology is fused, so that the permanent magnet synchronous motor can be operated in an overclocking mode. However, the 180-degree scheme has complex algorithm and larger control difficulty.

In view of the above-mentioned drawbacks, the present designer is actively making research and innovation to create an intelligent controller for a permanent magnet synchronous motor with a novel structure, so that the intelligent controller has more industrial utilization value.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model aims at providing a PMSM intelligent control ware.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an intelligent controller of a permanent magnet synchronous motor comprises a power supply, wherein the output end of the power supply is connected with the input end of an input filtering and rectifying unit, the output end of the input filtering and rectifying unit is connected with the input end of the motor through an inverter, the output end of the input filtering and rectifying unit is connected with the input end of the auxiliary power supply, the output end of the auxiliary power supply is connected with the input end of the motor control unit, the control end of the motor control unit is connected with the controlled end of the motor, the motor control unit is mutually connected with the main control MCU, the main control MCU is mutually connected with the temperature acquisition unit, the main control MCU is mutually connected with the heat radiation fan, the main control MCU is mutually connected with the alarm output unit, the master control MCU and the motor speed feedback unit are mutually connected, and the temperature acquisition unit, the cooling fan, the alarm output unit and the motor speed feedback unit are electrically connected with the motor.

Preferably, in the intelligent controller for the permanent magnet synchronous motor, the input filter rectification unit is a three-phase bridge rectification circuit.

Preferably, the intelligent controller for the permanent magnet synchronous motor is characterized in that the main control MCU is connected to the outer end through an RS485 communication unit.

Preferably, the intelligent controller for the permanent magnet synchronous motor comprises an alarm output unit, a motor overcurrent alarm, an out-of-step alarm, a locked rotor alarm, a phase failure alarm, an over-high voltage alarm and an over-low voltage alarm.

Preferably, in the intelligent controller for a permanent magnet synchronous motor, the auxiliary power supply is a DC/DC power supply.

Borrow by above-mentioned scheme, the utility model discloses at least, have following advantage:

the utility model discloses realize PMSM's drive and whole direct current air conditioner control system's whole solution, can also improve the utilization efficiency when having improved the security, adopt automatic mode to control, make its control mode simple to can carry out real time monitoring.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Examples

As shown in fig. 1, an intelligent controller for a permanent magnet synchronous motor comprises a power supply 1, wherein the output end of the power supply 1 is connected with the input end of an input filter rectifying unit 2, the output end of the input filter rectifying unit 2 is connected with the input end of a motor 4 through an inverter 3, the output end of the input filter rectifying unit 2 is connected with the input end of an auxiliary power supply 5, the output end of the auxiliary power supply 5 is connected with the input end of a motor control unit 6, the control end of the motor control unit 6 is connected with the controlled end of the motor 4, the motor control unit 6 is connected with a main control MCU7 in an intersecting way, a main control MCU7 is connected with a temperature acquisition unit 8 in an intersecting way, a main control MCU7 is connected with a cooling fan 9 in an intersecting way, the main control MCU7 is connected with an alarm output unit 10 in an intersecting way, the main control MCU7 is connected with a motor speed feedback unit 11 in an intersecting way, the temperature acquisition unit 8, the cooling fan 9, the alarm output unit 10 and the motor speed feedback unit 11 are electrically connected with the motor 4.

The utility model discloses well input filter rectifier circuit has adopted three-phase bridge rectifier circuit, and the later stage adopts the film capacitor filtering, adopts this design to improve the power factor of controller, and when rated power, for traditional electrolytic capacitor scheme, reactive power can reduce 50%, has improved the harmonic performance greatly.

The utility model discloses well auxiliary power source has adopted high input voltage's DC/DC power chip, ensures the high input voltage that the input can support to voltage conversion efficiency has been improved.

The utility model provides an important link of controller is exactly the frequency conversion drive to PMSM. The variable frequency driving part of the permanent magnet synchronous motor adopts a special solution chip with high performance and high integration. The chip integrates a current amplification sampling circuit, can adopt a single-resistor or three-resistor circuit structure, adopts a space vector algorithm, and drives a motor in real time. The part includes various alarm output units and fault handling. The method comprises overcurrent alarm, step-out alarm, locked rotor alarm, open-phase alarm, overvoltage alarm and overvoltage alarm of the motor.

The over-current alarm comprises hardware over-current alarm and software over-current alarm. The hardware overcurrent alarm is realized by comparing the voltage on the current detection resistor with a preset voltage and directly switching off the output of the power device if the voltage exceeds a limit value.

The software overcurrent protection is that the voltage of a current detection resistor is amplified, the main control MCU is used for collecting and calculating, and when the collected current value exceeds a limit value, the main control MCU directly turns off the output of the power device. The dual overcurrent protection of hardware and software improves the reliability of variable frequency drive, and further protects the safety of a motor and a power device.

The step-out alarm is an alarm which is sent out when the main control MCU detects that the current vector angle and the actual angle of the magnetic field have deviation and exceed the limit value. The permanent magnet synchronous motor can be locked due to the fact that the stator and the rotor are impacted after being out of step. The alarm can effectively reduce such risks.

The main control MCU detects phase current and can judge the motor locked rotor. Once the locked rotor is judged, the main control MCU cuts off the output of the power device. By analyzing U, V, W the current values of three phases, if the difference value between any phase current and other two phases exceeds the preset alarm value, the MCU will judge it as the phase-lack alarm. The MCU cuts off the output of the power device.

The main control MCU collects the bus power supply voltage in real time, and if the voltage value exceeds a preset range, an over-voltage alarm or an over-voltage alarm is triggered. When the voltage returns to normal, the alarm is automatically cleared, and the normal working state is restored.

The utility model discloses well cooling fan has adopted temperature control, and when the module temperature was greatly greater than 60 degrees, the fan was automatic to be opened.

The utility model provides a temperature acquisition unit is temperature sensor, can gather ambient temperature, indoor temperature, condensing temperature and evaporating temperature etc.. In addition, a humidity acquisition interface is reserved in the controller, and humidity values can be acquired.

The utility model discloses the external communication interface of controller adopts the RS485 interface, and this interface adopts the design of keeping apart entirely, has improved reliability and security. In addition, the controller is provided with a manual operator, and the manual operator can display the running state and parameters in real time. The user may also set parameters by means of a hand operator.

The utility model discloses in adopted the PID mode to PMSM's regulation, when there is the deviation in the target rotational speed of setting for and actual rotational speed, change the controller and can carry out PID setting, regulation to PMSM's rotational speed according to established coefficient in the procedure.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a PMSM intelligent control ware which characterized in that: including power (1), the output of power (1) links to each other with the input of input filter rectifier unit (2), the output of input filter rectifier unit (2) passes through inverter (3) and links to each other with the input of motor (4), the output of input filter rectifier unit (2) links to each other with the input of auxiliary power source (5), the output of auxiliary power source (5) links to each other with the input of motor control unit (6), the control end of motor control unit (6) links to each other with the controlled end of motor (4), motor control unit (6) and the crossing interconnect of master control MCU (7), master control MCU (7) and temperature acquisition unit (8) are crossing interconnect, the crossing interconnect of master control MCU (7) and cooling fan (9), the crossing interconnect of master control MCU (7) and output unit (10) is reported an emergency and asked for help or increased vigilance, the master control MCU (7) is mutually connected with the motor rotating speed feedback unit (11), and the temperature acquisition unit (8), the cooling fan (9), the alarm output unit (10) and the motor rotating speed feedback unit (11) are electrically connected with the motor (4).

2. The intelligent controller for the permanent magnet synchronous motor according to claim 1, characterized in that: the input filtering rectification unit (2) is a three-phase bridge rectification circuit.

3. The intelligent controller for the permanent magnet synchronous motor according to claim 1, characterized in that: the main control MCU (7) is connected to the outer end through an RS485 communication unit (12).

4. The intelligent controller for the permanent magnet synchronous motor according to claim 1, characterized in that: the alarm output unit (10) comprises a motor overcurrent alarm, a step-out alarm, a locked rotor alarm, a phase failure alarm, a voltage overhigh alarm and a voltage overlow alarm.

5. The intelligent controller for the permanent magnet synchronous motor according to claim 1, characterized in that: the auxiliary power supply (5) is a DC/DC power supply.