Control method based on servo turntable with Hall brushless DC motor
A brush DC motor and control method technology, applied in the direction of electronic commutator, etc., can solve the problems of many signals collected by the motor controller, complex calculation, complex structure, etc., and achieve large load capacity, accurate position recording, and rapid response Effect
Inactive Publication Date: 2009-10-07
天津市嘉杰电子有限公司
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Problems solved by technology
This kind of structure is relatively complicated, the signal collected by the motor controller is many, the calculation is complicated, and the cost is high
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[0013] In order to further understand the content, characteristics and effects of the present invention, the following embodiments are given as examples, and are described in detail as follows in conjunction with the accompanying drawings:
[0014] figure 2 is the structural block diagram of the servo control turntable of the present invention, image 3 is a structural block diagram of a servo-controlled turntable according to a specific embodiment of the present invention, Figure 4 is the position diagram of the three Hall element level signal edges of the present invention, Figure 5 It is a flow chart of the servo control turntable of the present invention.
[0015] A control method based on a servo turntable with a Hall brushless DC motor of the present invention is as follows: figure 2 Shown: the structure of the control method includes a brushless DC motor with Hall 1 and a motor controller 2; the brushless DC motor with Hall includes a permanent magnet, an armatur...
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The present invention belongs to the technical field of security monitoring camera. A control method based on servotable with Hall brushless DC motor according to the invention comprises the following steps: a step for obtaining the movement direction information according to a relationship between the edge of level signal of a random Hall element in three Hall elements and the edge of level signal of other Hall element; a step for combining the movement direction and executing addition counting or subtraction counting to the number of level signal of Hall element for obtaining the rotation position information of motor; and a step of measuring the time interval of two adjacent edges of Hall level signal for obtaining the speed information. The turntable controlled by the control method of the invention is only composed of the brushless DC motor and a motor controller. The closed-loop control of position and speed can be realized without an external sensor. The control method of the invention furthermore has the advantages of greatly reduced cost, wide speed adjusting range, stable speed adjustment, quick action, accurate and reliable position record, no step loss, large carrying capacity and low power consumption.
Description
Technical field: [0001] The invention belongs to the technical field of security surveillance cameras, in particular to a control method based on a servo turntable with a Hall brushless DC motor. Background technique: [0002] The general control method of the turntable of the security surveillance camera is to use a brushed DC motor with an encoder or a potentiometer to realize closed-loop control, or use a power frequency AC motor or a stepper motor to drive the turntable. These methods are either high cost, poor reliability, or With open-loop control, the position cannot be guaranteed to be accurate. [0003] With the development of electronic technology and motor technology, low-power brushless DC motors are gradually replacing traditional motors with their high power density, high reliability and good speed regulation performance, and the servo control of motors is becoming more and more extensive. as attached figure 1 As shown, a typical BLDC motor servo control syst...
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Inventor 王春宣刘占军
Owner 天津市嘉杰电子有限公司