CN211629918U - motor - Google Patents

Abstract

The utility model provides a motor, wherein the motor comprises: a rectifier circuit, a power decoupling circuit and an inverter circuit; wherein, the rectifier circuit, the power decoupling circuit and the inverter circuit are connected in parallel with the inverter circuit. a motor; the rectifier circuit is connected to the input end of the motor, and the inverter circuit is connected to the output end of the motor; the rectifier circuit is used to convert the alternating current input into the motor into direct current, and convert the The direct current is input to the power decoupling circuit; the power decoupling circuit is used for storing electric energy according to the direct current and providing electric energy for the motor; the inverter circuit is used for converting the direct current into Alternating current and output through the output terminal. The utility model solves the problems in the related art that the electrolytic capacitor is connected in parallel on the DC side as an energy storage and buffer unit, resulting in a short service life and low reliability of the entire control system.

Description

motor

technical field

The utility model relates to the electromechanical field, in particular to a motor.

Background technique

Permanent magnet synchronous motor has a wide range of applications in the field of industrial control, and its high reliability and high efficiency drive has become the focus of relevant scholars. In traditional motor control systems, electrolytic capacitors are usually connected in parallel on the DC side as energy storage and buffer units. However, due to the defects of electrolytic capacitors themselves, the service life and reliability of the entire control system are affected. Figure 1 is a schematic diagram of a traditional single-phase system motor control circuit. As shown in Figure 1, C is an electrolytic capacitor, the left side of capacitor C is a rectifier circuit, and the right side is an inverter circuit, and the power flows from left to right. This kind of circuit generally needs to filter the electrolytic capacitor C in parallel on the DC side to stabilize the output voltage. However, electrolytic capacitors are large in size, high in cost, low in power density and large in loss, which will reduce the reliability of the motor control system and shorten the service life.

For the above-mentioned problems in the related art, there is currently no effective solution.

Utility model content

The embodiments of the present utility model provide a motor to at least solve the problems in the related art that electrolytic capacitors are connected in parallel on the DC side as energy storage and buffer units, resulting in a short service life and low reliability of the entire control system.

According to an embodiment of the present invention, a motor is provided, comprising: a rectifier circuit, a power decoupling circuit and an inverter circuit; wherein, the rectifier circuit, the power decoupling circuit and the inverter circuit are connected in parallel the motor; the rectifier circuit is connected to the input end of the motor, and the inverter circuit is connected to the output end of the motor; the rectifier circuit is used to convert the alternating current input into the motor into direct current, and inputting the direct current to the power decoupling circuit; the power decoupling circuit for storing electric energy according to the direct current and providing electric energy for the motor; the inverter circuit for converting the direct current Converted to AC and output through the output.

Further, when the motor is powered on normally, the power decoupling circuit stores electrical energy while providing electrical energy for the motor; when the input voltage cannot meet the requirements of the motor, the power decoupling circuit stores the electrical energy. The coupling circuit provides electrical energy to the motor through the stored electrical energy.

Further, the power decoupling circuit includes: a first power switch tube, a second power switch tube, a first inductor, a second inductor, a first film capacitor and a second film capacitor; wherein, the first power switch tube The collector is connected to one end of the first inductor, the other end of the first inductor is connected to one end of the first film capacitor connected in series, and the other end of the first film capacitor is connected to the second film One end of the capacitor is connected, the other end of the second film capacitor is connected to the emitter of the second power switch tube, the collector of the second power switch tube is connected to one end of the second inductor, the second inductor The other end of the power switch is connected to the emitter of the first power switch; the connection point between the collector of the second power switch and the second inductor and the connection point between the first film capacitor and the second film capacitor connect.

Further, the power decoupling circuit further includes: a first diode, a second diode and a third diode; wherein the first diode is connected in series with the first inductor and the first thin film between capacitors; one end of the second diode is connected to the emitter of the first power switch tube, and the other end of the second diode is connected to the collector of the second power switch tube.

Through the utility model, a power decoupling circuit is arranged in the motor, so that the ripple and pulse power are released through the decoupling circuit, the power quality of the output voltage is improved, and the stability and reliability of the motor are improved, thereby solving the problems in the related art. The electrolytic capacitor is connected in parallel on the DC side as an energy storage and buffer unit, which leads to the problems of short service life and low reliability of the entire control system.

Description of drawings

The accompanying drawings described here are used to provide further understanding of the present invention and constitute a part of the present application. The schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is a schematic diagram of a conventional single-phase system motor control circuit;

2 is a schematic circuit diagram of a motor according to the present embodiment;

3 is an optional circuit schematic diagram of a motor according to an embodiment of the present invention.

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. .

Example 1

FIG. 2 is a schematic circuit diagram of a motor according to this embodiment. As shown in FIG. 2 , the motor includes: a rectifier circuit, a power decoupling circuit and an inverter circuit; wherein the rectifier circuit, the power decoupling circuit and the inverter circuit are connected in parallel Motor; the rectifier circuit is connected to the input end of the motor, and the inverter circuit is connected to the output end of the motor;

Among them, the rectifier circuit is used to convert the alternating current input to the motor into direct current, and the direct current is input to the power decoupling circuit; the power decoupling circuit is used to store electric energy according to the direct current and provide electric energy for the motor; the inverter circuit is used to It is used to convert direct current to alternating current and output it through the output terminal.

Further, in an optional implementation of this embodiment, when the motor is powered on normally, the power decoupling circuit stores electrical energy while providing electrical energy for the motor; when the input voltage cannot meet the requirements of the motor, The power decoupling circuit provides electrical energy to the motor from the stored electrical energy.

It can be seen that, as shown in Figure 2, the power flows from left to right, passing through the power decoupling circuit in the middle. Part of the grid energy is stored in the decoupling circuit, and the other part directly powers the permanent magnet synchronous motor. When the grid voltage is low, this part releases energy to provide electrical energy for the permanent magnet synchronous motor, which reduces the energy storage required by the capacitor, that is, reduces the capacitance value of the capacitor.

Further, the power decoupling circuit of this embodiment may further include: a first power switch S1, a second power switch S2, a first inductor L1, a second inductor L2, a first film capacitor C1 and a second film capacitor C2 ;in,

The collector of the first power switch tube S1 is connected to one end of the first inductance L1, the other end of the first inductance L1 is connected to one end of the first film capacitor C1 connected in series, and the other end of the first film capacitor C1 is connected to the second film One end of the capacitor C2 is connected, the other end of the second film capacitor C2 is connected to the emitter of the second power switch S2, the collector of the second power switch S2 is connected to one end of the second inductor L2, and the other end of the second inductor L2 is connected. One end is connected to the emitter of the first power switch S1; the connection point of the collector of the second power switch S1 and the second inductor L2 is connected to the connection point of the first film capacitor C1 and the second film capacitor C2.

Further, the power decoupling circuit in this embodiment further includes: a first diode D1, a second diode D2 and a third diode D3; wherein,

The first diode D1 is connected in series between the first inductor L and the first film capacitor C1; one end of the second diode D2 is connected to the emitter of the first power switch S1, and the other end of the second diode D2 is connected to The collector of the second power switch S2 is connected.

Based on the above power decoupling circuit, in the specific implementation of this embodiment, the motor in this embodiment may be a permanent magnet synchronous motor without electrolytic capacitors, and the circuit of the motor is shown in FIG. 3 .

When the power switch tubes S1 and S2 are both turned on, the energy in the rectification link is charged to L2, the voltage across the inductor is the grid input voltage, and the inductor current rises. At this time, the motor is powered through the film capacitor, and the voltage across the film capacitor decreases. When the power switch tubes S1 and S2 are both turned off, L2 begins to release the stored electric energy. At this time, there are two circuits for supplying electric energy to the motor. One is that the grid energy is directly supplied to the film capacitor and the motor energy through the inductors L1 and D1; One is that the inductor L2 freewheels through D2D3 to provide energy for the motor and the film capacitor C2, and the inductor current drops. At this time, the film capacitor is in a charged state, and the voltage at both ends increases.

By controlling the on-off of switch tubes S1 and S2, the decoupling of the power circuit is realized. The power circuit absorbs all the ripple voltage through the L2 charge and discharge, which improves the power quality on the DC bus side.

That is, this embodiment also provides a method for controlling a motor, wherein the motor includes: a rectifier circuit, a power decoupling circuit and an inverter circuit; the method includes:

Step S102, the rectifier circuit converts the AC power input to the motor into DC power, and inputs the DC power to the power decoupling circuit;

Step S104, the power decoupling circuit stores electric energy according to the direct current, and provides electric energy for the motor;

Step S106, the inverter circuit converts the direct current into alternating current and outputs it through the output terminal.

Wherein, for the above-mentioned step S104, it may further be: in the case that the motor is powered on normally, the power decoupling circuit stores electric energy while providing electric energy for the motor; in the case that the input voltage cannot meet the requirements of the motor, the power decoupling circuit The electric motor is powered by the stored electrical energy.

It should be noted that the power decoupling circuit of this embodiment may further include: a first power switch S1, a second power switch S2, a first inductor L1, a second inductor L2, a first film capacitor C1 and a second film Capacitor C2; where,

The collector of the first power switch tube S1 is connected to one end of the first inductance L1, the other end of the first inductance L1 is connected to one end of the first film capacitor C1 connected in series, and the other end of the first film capacitor C1 is connected to the second film One end of the capacitor C2 is connected, the other end of the second film capacitor C2 is connected to the emitter of the second power switch S2, the collector of the second power switch S2 is connected to one end of the second inductor L2, and the other end of the second inductor L2 is connected. One end is connected to the emitter of the first power switch S1; the connection point of the collector of the second power switch S1 and the second inductor L2 is connected to the connection point of the first film capacitor C1 and the second film capacitor C2.

Further, the power decoupling circuit in this embodiment further includes: a first diode D1, a second diode D2 and a third diode D3; wherein the first diode D1 is connected in series with the first inductor L and the first film capacitor C1; one end of the second diode D2 is connected to the emitter of the first power switch S1, and the other end of the second diode D2 is connected to the collector of the second power switch S2.

Based on this, when the motor is powered on normally, both the first power switch S1 and the second power switch S2 are turned on, the second inductor L2 is charged through the rectifier circuit, and the first film capacitor C1 and the second film capacitor are charged through the first film capacitor C1 and the second film capacitor. C2 supplies power to the motor. When the input voltage cannot meet the requirements of the motor, both the first power switch S1 and the second power switch S2 are turned off, and the second inductor L2 releases the stored electrical energy.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the principles of the present invention shall be included within the protection scope of the present invention.

Claims (4)

1. A motor, comprising: a rectifier circuit, a power decoupling circuit and an inverter circuit; wherein, the rectifier circuit, the power decoupling circuit and the inverter circuit are connected in parallel to the motor; the rectifier circuit is connected to the input end of the motor, and the inverter circuit is connected to the output end of the motor; the rectifier circuit, for converting the alternating current input to the motor into direct current, and inputting the direct current to the power decoupling circuit; the power decoupling circuit, used for storing electric energy according to the direct current and providing electric energy for the motor; The inverter circuit is used to convert the direct current into alternating current and output it through the output terminal. 2. The motor according to claim 1, characterized in that, When the electric motor is powered on normally, the power decoupling circuit stores electric energy while providing electric energy for the electric motor; In the case that the input voltage cannot meet the demand of the motor, the power decoupling circuit provides the motor with electrical energy through the stored electrical energy. 3 . The motor according to claim 1 , wherein the power decoupling circuit comprises: a first power switch tube, a second power switch tube, a first inductor, a second inductor, a first film capacitor and a second film capacitors; of which, The collector of the first power switch tube is connected to one end of the first inductor, the other end of the first inductor is connected to one end of the first film capacitor connected in series, and the other end of the first film capacitor is connected in series. One end is connected to one end of the second film capacitor, the other end of the second film capacitor is connected to the emitter of the second power switch tube, and the collector of the second power switch tube is connected to one end of the second inductor connection, the other end of the second inductor is connected to the emitter of the first power switch tube; the connection point between the collector of the second power switch tube and the second inductor is connected to the first film capacitor and the The connection point of the second film capacitor is connected. 4. The motor according to claim 3, wherein the power decoupling circuit further comprises: a first diode, a second diode and a third diode; wherein, The first diode is connected in series between the first inductor and the first film capacitor; one end of the second diode is connected to the emitter of the first power switch tube, and the other end of the second diode is connected to the emitter of the first power switch tube. One end is connected to the collector connection of the second power switch tube.

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