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Induction motor driving system

A technology for induction motors and drive systems, applied in control systems, AC motor control, electrical components, etc., can solve problems such as additional motor loss and noise, difficulty in control signal calculation, poor reliability of starting systems, etc., to reduce costs and expand applications. The effect of reducing the range and overcurrent probability

Active Publication Date: 2016-03-23
FORTIOR TECH SHENZHEN
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Problems solved by technology

[0002] When designing a single-phase induction motor, the air-gap magnetic field of the motor can only be designed to be circular at a certain speed; for example, if special attention is paid to the starting characteristics of the motor, the air-gap magnetic field of the motor in the starting state can be designed as Circular, but this will cause the magnetic field to be elliptical during operation. If we focus on the operating characteristics of the motor, the air gap magnetic field of the motor at rated speed can be designed to be circular, but this will make the magnetic field of the motor in the starting state It is elliptical, and the elliptical magnetic field will cause additional loss and noise of the motor, which are undesirable in motor applications, which also limits the reasons for single-phase induction motors, such as occasions that require speed regulation
[0003] For multi-phase induction motors including two-phase induction motors, when the corresponding multi-phase drive voltage is symmetrical, the air gap magnetic field of the motor is circular at all speeds, so that the motor has high efficiency, quietness and high power density. Features, if frequency control is used, these multi-phase induction motors can be adjusted in a wide range, and the efficiency is high; in order to realize the drive of two-phase induction motors, or other even-numbered M-phase induction motors, usually need 4M power semiconductor tubes are used to form a multi-phase bridge. If the number of phases is odd, 2M power semiconductor tubes are needed to form a multi-phase bridge. This requires multiple control signals to carry out linkage chopping control on these power semiconductor tubes, so that Realize multi-phase symmetrical driving current, which makes the structure of the driving circuit complex, the calculation of the control signal difficult, the reliability of the starting system is poor, and the cost of the driving system is also high, which obviously limits the application of motors such as two-phase induction motors

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0022] An embodiment of the present invention provides an induction motor drive system, such as figure 1 As shown, the system includes two-phase induction motor, power filter circuit, H-bridge power drive circuit, controller MCU,

[0023] The source filter circuit is used to filter out the harmonic components on the DC power supply and generate the midpoint voltage of the power supply required for driving;

[0024] The controller MCU is used to generate switch control signals required for the operation of the H-bridge power drive circuit;

[0025] Specifically, according to the control input para...

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Abstract

The invention discloses an induction motor driving system which comprises the components of a two-phase induction motor, a power filter circuit, an H-bridge power driving circuit and a microcontroller unit MCU. The power filter circuit is used for filtering a harmonic component on a DC power supply and generating a power supply middle-point voltage required for driving. The microcontroller unit MCU is used for generating a switching control signal which is required for operation of the H-bridge power driving circuit. The H-bridge power driving circuit is used for generating a driving current and transmitting to the two-phase induction motor. The two-phase induction motor is used for receiving the driving current which is generated by the H-bridge power driving circuit. The induction motor driving system has advantages of remarkably reducing loss, reducing cost, improving reliability and motor efficiency, expanding speed regulation range and reducing noise.

Description

technical field [0001] The invention relates to the technical field of induction motor drive, in particular to an induction motor drive system. Background technique [0002] When designing a single-phase induction motor, the air-gap magnetic field of the motor can only be designed to be circular at a certain speed; for example, if special attention is paid to the starting characteristics of the motor, the air-gap magnetic field of the motor in the starting state can be designed as Circular, but this will cause the magnetic field to be elliptical during operation. If we focus on the operating characteristics of the motor, the air gap magnetic field of the motor at rated speed can be designed to be circular, but this will make the magnetic field of the motor in the starting state Being elliptical, the elliptical magnetic field will cause additional loss and noise in the motor, which are undesirable in motor applications, which also limits the reasons for single-phase induction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/02
CPCH02P25/02Y02P80/10
Inventor 龙彪毕超宋金旺罗薛毕磊
Owner FORTIOR TECH SHENZHEN
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