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Sensorless driving system for three-phase motor of four-switch inverter

A technology for three-phase motors and drive systems, which is applied in the control of electromechanical transmissions, control systems, and generators, and can solve the problems of slow steady-state response, high cost, and symmetrical output of three-phase voltage signals.

Active Publication Date: 2017-05-31
CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in occasions where the accuracy of speed regulation is not very high, such as mine electric locomotives, fans, water pumps, etc., the cost of using a six-switch inverter is relatively higher
[0004] However, using the traditional method to directly reduce the number of switches in the conventional three-phase six-switch inverter cannot make the inverter output a symmetrical three-phase voltage signal, and it cannot meet the requirements of the drive system such as the motor at all.
In the existing technology, the invention patent with the application number 201610533077.4: a model predictive control method for a three-phase four-switch inverter driving a permanent magnet synchronous motor, although it also involves a three-phase four-switch inverter driving a permanent magnet synchronous motor, However, the model predictive control algorithm used requires repeated iterative calculations, so the amount of calculation is huge, and the requirements for hardware performance and cost are higher, which deviates from the original intention of reducing costs
Especially in the case of low-precision motor control, the feasibility of implementing predictive control with high-cost hardware is low
In addition, model predictive control requires multiple sets of raw data to initialize the value function, and the steady-state response of the system is slow
Those skilled in the art try new solutions all the time, but this problem has not been properly solved

Method used

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  • Sensorless driving system for three-phase motor of four-switch inverter
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  • Sensorless driving system for three-phase motor of four-switch inverter

Examples

Experimental program
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Effect test

Embodiment 1

[0073] Example 1: see figure 1 , a four-switch inverter three-phase motor sensorless drive system, the four-switch inverter three-phase motor sensorless drive system includes a four-switch inverter input signal is a DC voltage, the DC voltage can be an inverter The output DC signal can also be the DC voltage output of the battery. The four-switch full-bridge inverter circuit includes two capacitors C1, C2 and four controllable switches S1-S4. The inverter has three voltage output ports, which are respectively connected to the three voltage input ports of the motor. The four switches are four IGBTs or GTOs and other controllable turn-on and turn-off thyristors, and the switch signals are generated by an ARM microprocessor. When the load is a motor, in order to achieve three-phase voltage output, the third phase of the motor is linked to the neutral point of a set of capacitors, and the neutral point potential is equivalent to the zero potential of the ground. The current sig...

Embodiment 2

[0074] Example 2: see Figure 1-Figure 6 , a control method of a four-switch inverter three-phase motor sensorless drive system, the control method is as follows:

[0075] 1) as figure 1 As shown in the figure, in the four-switch inverter, only four switches can be controlled to be turned on and off, and the four switches are S in the figure. 1 , S 2 , S 3 , S 4 , C in the figure 1 , C 2 Indicates the capacitor, and its state is uncontrollable, so there are only four switch states. The switch table is shown below. In the table, 1 means the switch is closed, and 0 means the switch is open.

[0076] model S 1

S 2

S 3

S 4

1 0 1 0 1 2 0 1 1 0 3 1 0 0 1 4 1 0 1 0

[0077] Depend on figure 1 It can be seen that the DC side is powered by an uncontrolled rectifier bridge, and the C phase is connected to the midpoint of the DC capacitor, so the DC side voltage output v dc′ There are fluctuations. It can be seen tha...

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Abstract

The invention relates to a sensorless driving system for a three-phase motor of a four-switch inverter. The sensorless driving system for the three-phase motor of the four-switch inverter is characterized by comprising a four-switch inverter, wherein an input signal of the four-switch inverter is direct-current voltage; a four-switch full-bridge inverter circuit comprises two capacitors C1 and C2 and four controllable switches S1-S4; the inverter is provided with three voltage output ports which are respectively connected with three voltage input ends of a motor. According to the technical scheme, the three-phase full-bridge inverter is formed by the four-switch inverter and two capacitors, an ARM chip with low cost is used as a master control processor, three-phase symmetric voltage signal output of the inverter can be realized by adopting a voltage compensation scheme, and meanwhile, the problem of fluctuation of neutral-point voltage of capacitors can be solved; and the position and rotating speed of the motor are evaluated by adopting a sensorless algorithm, the robustness of a control system can be reinforced, the structure is effectively simplified, and the cost can be saved by about 35 percent.

Description

technical field [0001] The invention relates to a drive system, in particular to a sensorless drive system of a four-switch inverter three-phase motor, belonging to the field of motors and electrical appliances. Background technique [0002] With the improvement of electrification and industrialization level in various industries, electrification applications have been unprecedentedly popularized, and the optimization of the structure under the premise of meeting the stability requirements is a current research focus. [0003] The adjustable speed electric drive system has been widely used in the field of electric drive and is the core system component of the electric drive. In industrial applications, the three-phase motor used in the adjustable-speed electric drive system is more efficient than the single-phase motor, and the system accuracy and stability are better. The core component of the three-phase motor drive system is a three-phase inverter, and the most basic and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18H02P21/24
Inventor 谭国俊李浩方磊殷实关月琴何凤友
Owner CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO
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