Control method of non-sensor permenant-magnetic synchronous motor

A synchronous motor and permanent magnet technology, applied in motor control, motor generator control, AC motor control, etc., can solve the problems of sensor failure and high total cost, and achieve vibration prevention, stable and quiet low-speed rotation, and cost reduction. Effect

Inactive Publication Date: 2012-08-15
C UYEMURA & CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Not only is the total cost of such a sensor-equipped PMSM, control circuit, and inverter device higher than the total cost of an induction motor and an inverter device that is a typical example of an AC motor, but there is also a problem of sensor failure. For this reason, In the case of PMSMs such as blowers that are used at a fixed speed or higher, the sensorless PMSM is adopted to reduce costs by not requiring sensors.

Method used

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  • Control method of non-sensor permenant-magnetic synchronous motor
  • Control method of non-sensor permenant-magnetic synchronous motor
  • Control method of non-sensor permenant-magnetic synchronous motor

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Embodiment 1

[0027] The so-called synchronous starting method is one of the ways to start the synchronous motor powered by three-phase AC power supply, such as Figure 6 As shown, both the synchronous generator G on the driving side and the synchronous motor M on the driven side are used as synchronous equipment. In the stopped state, the three-phase terminals of the two are connected to each other and the excitation current flows respectively. When starting, use The driving device D directly connected to the synchronous generator G rotates slowly, then the synchronous generator G rotates and supplies the ultra-low frequency current to the synchronous motor M, and the magnetic field generated by the rotating magnetic field and the excitation current generated on the side of the synchronous motor M It works to synchronize the synchronous motor M with the synchronous generator G, and then continue to increase the synchronous speed by increasing the speed of the synchronous generator G until i...

Embodiment 2

[0100] Next, a second embodiment of the synchronous activation method will be described. Such as image 3 As shown, in the three-phase coil, DC current flows into the two-phase coil first, and the rotor magnetic pole is attracted by the stator magnetic axis (non-rotating) generated thereby, and the magnetic axis is adjusted for synchronization, and then, like a common inverter device, Phase switching is performed between VW and WU to increase the frequency. Even in this case, a fixed time Δt of several seconds is required to align the initial magnetic poles with the magnetic axis (until the rotor is synchronized and stabilized while vibrating with natural vibration).

[0101] image 3 It is a diagram about one PMSM. When this method is applied to the start-up of two or more X PMSMs, although the synchronization conditions will be slightly stricter, it can be obtained by studying the resistance value of the PMSM, GD 2 , Applied voltage, etc. to achieve reliable synchronizati...

Embodiment 3

[0104] When sensorless PMSM is used such as a large air conditioner, the load directly connected to the PMSM is a blower, and the power supply is cut off to stop a certain PMSM group (two or more PMSMs operating with a single inverter device) At this time, the positive pressure environment caused by other running blowers exerts pressure on the stopped blower, which becomes the reverse rotation and rotates opposite to the normal state. Its speed can sometimes reach 40% of the rated speed.

[0105] The present invention proposes a method for reliably synchronizing with a single inverter power supply and stably starting even in the case of two or more sensorless PMSMs under such reverse rotation conditions.

[0106] If the two blowers have different power sources (inverter devices for each), at different speeds (for example, one is -N 3 min -1 , the other is -N 4 min -1 ) is rotating, in the case of 1C1M, connect the coils of each phase of the two PMSMs, and use the current f...

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Abstract

The present invention provides a new method of controlling permanent magnet synchronous motor without a sensor. The control method adopts a single inverter device to reliably and synchronously start more than 2 PMSM without a sensor, and control the vibration and so on occurred during stable rated operation and low-speed rotation as well as the safe stopping and so on when in fault. The present invention is not only a synchronous starting manner for more than 2 permanent magnet synchronous motors without a sensor powered by the three-phase alternating current power supply, but also a method of controlling the synchronous starting of more than 2 permanent magnet synchronous motors without a sensor powered by the three-phase alternating current power supply. Moreover, the present invention is characterized in that after the single inverter imposes the ultra-low frequency three-phase alternating current on more than 2 PMSM at a fixed time and synchronously starts the PMSM at low speed, the power frequency is gradually increased so as to elevate the rotation speed up to the rated rotation speed.

Description

technical field [0001] The present invention relates to a sensorless permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, hereinafter referred to as PMSM) control method, in particular to using a single inverter device to start more than two sensorless PMSMs synchronously and continuously at a rated speed A sensorless PMSM control method that operates, can start from the reverse rotation state, can prevent vibration generated when running below the rated speed, and stops safely in the event of a failure. Background technique [0002] In the past, PMSMs powered by three-phase AC power were equipped with a sensor (position detection device) to detect the rotor magnetic pole position, and adopted such a starting method: that is, the rotor magnetic pole position was detected by the sensor, and the current flowed through it according to the detected rotor magnetic pole position. Each phase of the stator coil generates a rotating magnetic field, and the interact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/20H02P6/04H02P6/24H02P1/54H02P1/52H02P21/05H02P21/18H02P21/24H02P21/34H02P23/04H02P25/026H02P27/06
CPCH02P1/54H02P5/74H02P25/024H02P27/06H02P2207/05
Inventor 高桥满上村佳一清水义彦上林笃崔起洙朱盛男
Owner C UYEMURA & CO LTD
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