Brushless direct current motor rotor position detection method based on single-phase inductance detection

A technology of rotor position detection and brushed DC motor, which is applied in the direction of AC motor control, electronic commutation motor control, motor control, etc. It can solve the problem of no driving effect of detection vector, poor performance of motor speed and torque, and extended control cycle and other issues, to achieve the effect of improving the driving effect, reducing the flow of reactive energy, and reducing the torque ripple

Inactive Publication Date: 2019-04-26
天津卓业科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rotor position detection method based on the inductance method needs to inject the detection vector pulse, and the detection vector often has no driving effect or the driving effect is very poor, resulting in relatively poor

Method used

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  • Brushless direct current motor rotor position detection method based on single-phase inductance detection
  • Brushless direct current motor rotor position detection method based on single-phase inductance detection
  • Brushless direct current motor rotor position detection method based on single-phase inductance detection

Examples

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Example Embodiment

[0033] Brushless DC motor three-phase inverter circuit diagram such as figure 1 As shown, the three-phase voltage equation is

[0034]

[0035] Where: U A , U B , U C Respectively A, B, C phase terminal voltage; i A , I B , I C Respectively A, B, C phase current; e A , E B , E C Respectively A, B, C opposite electromotive force; R is winding resistance; L A , L B , L C Is the equivalent inductance of the A, B, and C phase windings; U N It is the neutral point of the motor to the ground voltage.

[0036] The voltage vector application method of each sector is shown in Table 1. The principle of the detection method of the present invention is introduced by taking sector III as an example.

[0037] image 3 Is the voltage vector application method in the sector III control period, V 101 , V CB , V x00 The three voltage vectors divide the control cycle into three stages.

[0038] Phase 1:

[0039] Apply three-phase voltage vector V 101 , At this time branch A satisfies the equation

[0040...

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Abstract

The invention relates to a brushless direct current motor rotor position detection method based on single-phase inductance detection. The brushless direct current motor rotor position detection methodincludes the following steps that a detection vector with the time duration being delta T1 is applied to a motor stator winding, the detection phase current is sampled at the beginning and end of vector application correspondingly, and the current change rate is obtained through subtraction of two values; a driving vector with the time duration being delta T2 is applied to the motor stator winding to drive a motor to run; induction energy is released slowly and the motor driving current is maintained by applying a circulation follow current vector in the remaining time of the control period;the variation trend of frac{d}{d<t>} is judged; and the execution steps are repeated continuously after a motor rotor passes through a switching point, and the motor rotor is switched to the next section after waiting for a delay at an electrical angle of 30 degrees.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a method for detecting the rotor position of a brushless DC motor. Background technique [0002] Brushless DC motors have been widely used because of their simple structure, high operating efficiency, and convenient maintenance. Traditional brushless DC motors generally use three-phase six-state two-two conduction mode for drive control, and the rotor position sensor is required to detect six rotor position signals in one electrical cycle in order to commutate the windings. However, the installation of the rotor position sensor increases the size and cost of the motor, and the sensor signal is susceptible to environmental electromagnetic signal interference, which reduces the reliability of the system. Therefore, the research on sensorless rotor position detection technology has important theoretical research significance and application value. [0003] At pres...

Claims

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Application Information

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IPC IPC(8): H02P6/185H02P27/12H02P6/10
CPCH02P6/10H02P6/185H02P27/12H02P2207/05
Inventor 方红伟陈奇李国平
Owner 天津卓业科技发展有限公司
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