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Field Weakening Control Method for Permanent Magnet Synchronous Motor Considering Input Voltage Fluctuation

A permanent magnet synchronous motor, field weakening control technology, applied in the direction of motor generator control, electronic commutation motor control, control system, etc., can solve the problem of weak permanent magnet synchronous motor, achieve fast dynamic response, strong stability, Effects that are easy to understand and implement

Active Publication Date: 2022-02-15
THE 724TH RES INST OF CHINA SHIPBUILDING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that the permanent magnet synchronous motor outputs the rated torque at the rated speed when the input voltage fluctuates, and provides a method for controlling the field weakening of the permanent magnet synchronous motor

Method used

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  • Field Weakening Control Method for Permanent Magnet Synchronous Motor Considering Input Voltage Fluctuation
  • Field Weakening Control Method for Permanent Magnet Synchronous Motor Considering Input Voltage Fluctuation
  • Field Weakening Control Method for Permanent Magnet Synchronous Motor Considering Input Voltage Fluctuation

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specific Embodiment approach 1

[0017] DETAILED DESCRIPTION OF THE INVENTION A permanent magnet synchronous motor weak magnetic control method of input voltage fluctuations is considered, which includes the following steps:

[0018] Step 1: According to the rated torque T n , Rated speed Ω n And current limit value I max , Determine the lower limit value of the input bus voltage fluctuation U dcmin And weak magnetic control of maximum super angle β max ;

[0019] Step 2: Speed ​​closed loop control on the permanent magnet synchronous motor, the speed of the speed ring is current command I s And s Limit;

[0020] Step 3: Set the initial value of the super prior angle β 0 , Calculate the initial value of the current cycle toxiax current command and Combined with speed command Ω * Calculate the initial value of the voltage value

[0021] Step 4: According to the DC bus voltage acquired by real-time acquisition dc Computation voltage comparison threshold if At this point, you need to enter the weakening process...

specific Embodiment approach 2

[0025] DETAILED DESCRIPTION OF THE INVENTION The present embodiment is a further description of a permanent magnet synchronous motor weaker magnet synchronous motor considering input voltage fluctuations in the first embodiment, in the present embodiment, in step one according to the rated torque T n , Rated speed Ω n And current limit value I max , Determine the lower limit value of the input bus voltage fluctuation U dcmin And weak magnetic control of maximum super angle β max The process is:

[0026] Permanent magnet synchronous motor torque formula is:

[0027] T = 1.5N p [Ψ f i q (L) d -L q i d i q ]

[0028] The voltage limit circle formula is:

[0029]

[0030] The current limit circle formula is:

[0031]

[0032] The motor torque formula, the voltage electrode circular formula, and the current limit circle formula are indicated in the right angle coordinates of the intersection current as a horizontal coordinate, and the shaft current is a vertical angle coordinate, f...

specific Embodiment approach 3

[0035] DETAILED DESCRIPTION OF THE INVENTION 3: The present embodiment is a further explanation of a permanent magnet synchronous motor weakening control method that considers input voltage fluctuations in the first embodiment, in the present embodiment, in step 2, the permanent magnet synchronous motor is rotatably closed Control, the speed ring output is current command i s And s The process of performing a limit is:

[0036] The principle of the permanent magnet synchronous motor full speed range weak magnetic control method image 3 As shown, the speed feedback value ω is calculated according to the real-time position of the detected motor, and the rotational speed command ω is calculated. * Calculate the speed error, output current command I after the speed ring PI controller s If i s > I max Take I s = I max .

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Abstract

The invention proposes a field-weakening control method for a permanent magnet synchronous motor considering input voltage fluctuations. According to the rated torque T n , rated speed ω n and the current limit value I max , to determine the lower limit value U of the input bus voltage fluctuation dc min and maximum lead angle β for field weakening control max , the speed loop output current command i s , for i s Clipping is performed. Set the initial value of the lead angle β 0 , to calculate the initial value of the current cycle AC and DC axis current command and the initial value of the calculated voltage according to the real-time acquisition of the DC bus voltage U dc Calculate the magnitude of the comparison sum of the voltage comparison threshold to determine whether to enter the field weakening process or the field weakening process. When entering the field weakening process, gradually reduce the value of the lead angle, and calculate the AC and D axis current command and U * , until or β=0 to exit the loop, gradually increase the value of the lead angle when entering the field weakening process, and calculate the current command and U * , until or β=β max exit the loop. The sum of the above two situations when exiting the loop is used as the input of the current loop for closed-loop control.

Description

Technical field [0001] The present invention belongs to the field of permanent magnet synchronous motors. Background technique [0002] Permanent Magnet Synchronous Motors, PMSMs have the advantages of small size, high power density, high efficiency, high electromagnetic torque, widely used in high-performance AC servo systems such as artillery, radar, aerospace and aerospace. Since it adopts the permanent magnet, the excitation magnetic field cannot be adjusted by the excitation winding, so the permanent magnet synchronous motor must adopt a weak magnetic control technology to ensure that the rated torque can be output in the rated speed state in the case where the input voltage is widely fluctuated. [0003] At present, the permanent magnet synchronous motor is mostly used in the input voltage rated. d = 0 control method. At this time, the stator current has only shaft components, and the magnetic potential spatial vector of the stator is orthogonal to the permanent magnetic fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00
CPCH02P21/0003
Inventor 杜仁慧陶春荣陈威施永柱秦雅
Owner THE 724TH RES INST OF CHINA SHIPBUILDING IND
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