TW200415844A - Non-sensor commutation phase auto-corrector of three-phase brushless DC motor - Google Patents

Abstract

The present invention discloses a non-sensor commutation phase auto-corrector of three-phase brushless DC motor. It is able to only measure the line voltage of any phase of a three-phase brushless DC motor and the DC chain current of a power level converter as a feedback signal without going through the feedback of a position sensor, and utilizes software to instantly estimate the rotation speed of the motor and the variation of the connected load for being compared with the input power estimated according to the DC chain current, so as to automatically adjust the driving angle via a driving angle compensator. Therefore, the present invention is able to increase the operating performance of the motor, and also achieve a non-sensor driving control with maximum efficiency and maximum torque.

Description

200415844

1. [Technical Field to which the Invention belongs] The present invention relates to a sensorless drive technology for a three-phase brushless DC motor (Three-Flashless DC Motors), and more particularly to a three-phase brushless DC motor. Driven Phase Phase Auto-Corrector with Sensorless Drive Control 〇 2. [Previous technology] One-click, the application of tiny brushless DC motors is quite extensive, such as general small information equipment such as camera lens automatic Focusing piezo motor, optical disc drive, voice coil motor for pick-up head, spindle motor of optical disc drive, drive motor of image scanner, others such as electric toys, automobiles (wipers, electric antennas, side-view mirrors or medical equipment, etc. With the development of information appliances in the future, brushless straight motors will have great market development potential. Among them, sensorless ^ brush straight J motors will become the mainstream of the market. ^ Because of sensorless brushless DC The development of motors in the brushless DC motor application industry has received considerable attention, and many related technologies have been applied for the first time, such as China Patent Bulletin No. 398 1 1 3 Method and device for controlling operation of a brushless motor capable of detecting a sensorless position without a sensor, and a two-phase brushless type of a sensorless sensor of patent publication No. 4 2 3 2 0 6 j) c motor driving circuit The special case of the rectifier circuit of the sensorless motor driver of the special bulletin No. 4 2 3 2 0 5 and the sensorless three-phase brushless DC motor of the patent publication No. 4 6 6 8 2 2 However, in these sensorless drive conventional techniques applied to brushless DC motors, the load may change due to load changes during steady state operation.

200415844

As a result, the deviation of the driving phase angle leads to a loss of power compared with Λ and Xuankou n ¥, which makes it impossible to achieve the effect of maximum torque output at 2 m. On the other hand, S knows that the brushless DC technology can only be applied to the driving device with position salt: p, 丨 cry π y 轫 轫 phase angle withered 5 m drive / regular feedback, such as our patent Announcement No. 322655 of the driver such as fe free left; τ such as driving phase angle adjustment technology is not available for such devices. <… Brush-direct motor drive. Therefore, the present invention is directed to the brushless DC motor and sensorless drive, which enables the drive phase angle adjustment technology to brush the DC motor driver. There are three aspects of the present invention: The main purpose is to automatically adjust the disturbance torque and input power at the phase angle of the DC motor drive. At the time of junction, the control technology that can estimate the appropriate drive and produce the maximum output torque cannot be applied to the lack of sensors. Another object of the present invention is to automatically adjust the hardware cost of the DC motor drive phase angle to improve the motor performance in steady state operation, so as to save the above-mentioned problems. A drive phase angle automatic adjustment device that can apply dynamic control is proposed. It is widely used in the absence of sensorless feedback to solve the lack of knowledge. Provide a sensorless three-phase brushless device, which uses the estimated dry-optimized concept to operate the dynamic phase angle in a steady state to improve the efficiency of motor operation and solve the conventional driving phase angle. The feedback brushless DC motor driver provides a sensorless three-phase brushless device 'which does not require additional extra time' to effectively increase the motor torque output and the overall system power consumption.

Page 6 200415844 V. Liuduma pressure drive In contrast, chain work and horse work compensating body capacity and efficiency. Fourth invention description (3) = Invention of the invention-the purpose is to provide motor-driven phase angle automatic adjustment device, = t three-phase brushless You can get the best efficiency drive ". ..., at a speed of 151 motor, in order to achieve the above-mentioned purpose, the present invention is one-of-a-kind sensorless driving cry, # d, the heart is used in a two-phase brushless DC direct current converter: i: i , R uses the feedback motor to automatically adjust the phase angle of any phase of the motor. This adjusts the output phase angle of the output. This includes: a counter-electromotive force estimation technique, any phase connected to the β motor, u ^ connection 浐The difference in the speed estimation in the lightning-cure rail is based on the power meter commutation connected to the anti-EMF estimation tube and:-the interference torque current and the motor rotation speed are estimated: the second change = according to the input power of the DC; The other one on the right ^ 1 Liyang opens the wheel to 5 Hai rate Shizeng-β 工 4 and 4 and another drive phase angle compensator is based on the input estimation = and interference with the rotation of the torque observer to generate phase = compensation amount transmission Give a commutation controller so that it follows the ς, ^. Let the six power transistors in the commutation state of the sharp knife grade be described in detail with specific examples in conjunction with the attached drawings, so that it will be easier for people to understand the purpose, technical content, features and accomplishment of the present invention: The present invention is based on the feedback of the state without any magnetic poles, and only by 200415844

Feedback of any phase terminal voltage and DC link current of the three-phase brushless DC motor can drive the phase angle automatic adjustment device proposed by the present invention, which can generate the corresponding ^ off signal to the power stage converter to make the motor rotate at the same time The output power can also be obtained according to the motor speed and output torque estimated by the user, and then the input power estimated by the DC link current is compared. The motor's operating efficiency is improved by the automatic adjustment of the phase angle to solve the conventional brushless DC. Motor non-sensing drive technology causes errors in driving angle when the load changes, resulting in power loss and poor torque output and speed control response. The first figure is a block diagram of the structure of the present invention. As shown in the figure, a driving phase angle automatic adjustment device 10 is applied to a sensorless driver of a three-phase brushless DC motor, and the driving phase angle automatic adjustment device 丨〇 is connected to a power stage converter 30 and a brushless DC motor (Brushless DC

Motor) 40, the three-phase brushless DC motor 40 is a speed-controllable motor, wherein the power stage converter 30 is composed of six power transistors 32, and each power transistor 3 2 is also electrically connected to the brushless DC motor 40. The driving phase angle automatic adjustment device includes a commutation controller jCDmnuitat ion controller) 12 which is connected to a power stage commutation of 3 0 'for generating a switching signal to control the power stage commutator. 3 Power transistor 32, and can receive an external control signal (Duty); a back-EMF Estimator 1 4 is connected to one of the phases of the brushless DC motor 40, according to the brushless DC motor The line voltage (Vc) of 40 is different from the anti-electromotive force voltage (Ec) generated when the brushless DC motor rotates at 40. There is also a Speed Estimator (16)

200415844 V. Description of the invention (5) Connected to the anti-EMF estimator 1 4 which estimates the motor rotation speed (ω,) based on the anti-EMF voltage:-Disturbance Torque Observer 18 series is connected to the same time The power stage converter 30 and the speed estimator 16 are used to estimate the interference torque based on the DC link current (IDC) output by the power stage converter 30 and the motor rotation speed (ω,) output by the speed estimator 6 Change situation (td); there is also an input power estimator (Input Power Estimator) 20, which is also connected to the power stage converter 30, to estimate the wheel into the brushless DC motor 4 based on the DC link current (I%) 〇 input power (Pi); and a driving phase angle compensator (Phase Compensator) 22 connected to the interference torque observer 18 and the input power estimator 2 at the same time, so that the driving phase angle compensator 2 2 according to the interference torque The motor rotation speed (&) and output torque (td) output by the observer 18 are used to obtain an output power, and then compared with the input power estimator 2 output, ^ power (Ρί). The phase angle compensation of the corresponding motor (HA, HB, Hc) is generated and transmitted to the commutation controller 12 so that the commutation controller 12 can generate a corresponding six according to the motor phase angle compensation amount. Switch signals are used to control the six power transistors 32 respectively, thereby controlling the operation of the brushless DC motor 40. &… 1 Among them, the above-mentioned driving phase angle automatic adjustment device can be converted into voltage and current signals by analog / digital converters through software κ and X, and processed by the microcontroller or digital signals of the motor. Device to complete the above mentioned actors. $ Ϊ: ί m According to the input power estimator and the output of the interference torque, the output angle is changed to compensate the phase angle, so that the sensorless driver rotates in different motors.

Page 9 200415844

= The next phase guard can obtain the driving phase angle of the maximum output torque and the best efficiency in order to control the motor operating efficiency and produce the maximum output torque, and solve = σ because the driving phase angle adjustment technology cannot be applied to the sensorless Feedback ^ = up to the missing of the driver ..., the present invention is provided before increasing the cost, can be effective in the steady state operation, two power. To identify and improve the running performance of the motor in order to save the overall system consumption. The purpose is to familiarize and implement it. Whenever the patent drawing number covered by the present invention disclosed in accordance with the present invention is explained: The examples are only for the purpose of explaining whether those skilled in the art can limit the scope of the equal variation made by the spirit of the present invention. The technical idea of the technology and the patent scope within the present invention are enough to understand the scope of the patent, that is, to enlarge or modify, it should still contain 10 drive phase angle automatic adjustment 12 commutation controller 16 speed estimator 20 input power estimator 3 0 power stage commutation 4 0 Brushless DC Motor Chapter 14 Anti-EMF Estimator 18 Interference Torque Observation 2 2 Driving Phase Angle Compensation 32 Power Transistor Beam

Page 10 200415844 Brief description of the drawings The first diagram is a block diagram of the structure of the present invention. 11

Claims (1)

200415844 6. Scope of patent application-'\, a three-phase brushless DC motor drive phase angle automatic adjustment device without' / sensing 1 ', which is applied to a sensorless driver of a three-phase brushless DC motor, 'And use the line voltage of any phase of the feedback motor and the DC link current of the converter' to automatically adjust the output drive phase angle. The drive phase angle automatic adjustment device includes: an anti-EMF estimator connected to the three-phase Any phase of the brushless DC motor is used to estimate an anti-EMF voltage generated by the rotation of the motor; 21. A speed estimator connected to the anti-EMF estimator to estimate a motor rotation speed using the anti-EMF voltage; ^: disturbance torque observer, which is connected to a power stage converter and the speed estimator, Based on the DC link current and the rotation speed of the motor to estimate the change of interference torque; Shiyi input power estimator connected to the inverter to estimate the input power to the offending motor; a drive phase angle compensation A generator which generates a corresponding motor phase angle compensation amount based on the output of the input power estimator and the torque observer; and : ^ 11, connect the power stage converter to control the power stage converter by generating a switching signal according to the motor phase compensation. 2 Gan? . Λ Please drive the automatic phase angle adjustment device described in item 1 of the patent scope. // The two-phase brushless DC motor is a speed-controllable motor. 3 "The drive phase angle is automatically adjusted and placed as described in item 1 of the scope of the patent application, flow number = :: t: Christine is a switch signal to control the two-level change of the function Power transistors. 200415844 6. Scope of patent application 4. The driving phase angle automatic adjustment device as described in item 1 of the scope of patent application, wherein the commutation controller generates the switching signal according to an external control signal. . 5. The driving phase angle automatic adjustment device described in item 1 of the scope of the patent application, its t is implemented in software to convert the voltage and current signals to digital signals using an analog / digital converter, and is controlled by the micro-control of the motor Signal processor to complete. 6. The driving phase angle automatic adjustment device as described in item 丨 of the scope of the patent application. The 4 and 4 driving phase angle compensators are based on the input power estimation moment of the observer. , ^% Change the phase angle of the compensation, so that the sensorless drive number A is ^ Γθ ^ Max at the door motor speed. It is cut to the driving phase angle that can have the maximum wheel-out torque in different counties. Page 13