CN202276308U - Position detection control device of CT machine hub motor hub - Google Patents

Abstract

The utility model relates to a position detection control device of a CT machine hub motor hub. A position detection ring of a CT machine hub motor is magnetized to be an absolute position detection ring and a relative position detection ring, wherein the relative position detection ring is corresponded with three position sensors of the CT machine hub motor, the position sensors are used for controlling the commutation of the motor and measuring the rotation speed of the motor and ensuring the precision; the absolute position detection ring is corresponded with one position sensor of the absolute position and the position sensor is used for judging the absolute position of the motor and its commutation of the motor. The detection not only ensures the normal operation of the CT machine hub motor at high-precision position localization and simultaneously realizes the real time detection of the CT machine and the position adjustment to facilitate the increase in the scanning precision and greatly reduce the device cost.

Description

A kind of position measuring and controlling device of CT wheel hub motor wheel hub

Technical field

The utility model relates to wheel hub motor position and rotating speed prosecution technical field, particularly relates to a kind of position measuring and controlling device of CT wheel hub motor wheel hub.

Background technology

Along with the fast development of electrical technology, computer technology and control theory and perfect; Having promoted electric machines control technology develops towards high accuracy, high accuracy and high reliability direction; In addition; Because the continuous development of medical level and patient impel medicine equipment to develop towards high accuracy, high reliability and low-cost direction to the requirement of pathological diagnosis accuracy.At present, straight drive system is used on the CT machine widely, because bore is big, resolution requirement is high, directly adopts photoelectric encoder, resolver or grating, then can cause use cost too high.Each factory commercial city is the position detecting device of a low price of development.

Summary of the invention

The utility model technical problem to be solved provides a kind of position measuring and controlling device of CT wheel hub motor wheel hub, can carry out prosecution to the rotating speed of each commentaries on classics of wheel hub motor on the CT machine, and the operation of control CT machine.

The utility model solves the technical scheme that its technical problem adopted: a kind of position measuring and controlling device of CT wheel hub motor wheel hub is provided, comprises relatively to the position detection ring, definitely to position detection ring, absolute position transducer, relative position sensor, comparator and show output and motor speed control system.Described relative position detection ring links to each other with relative position sensor; Described absolute position detection ring links to each other with absolute position transducer; Described position transducer is N type Hall switch formula position transducer or rheostat position transducer; Described comparator links to each other with the motor relative position sensor with absolute position transducer respectively; Described comparator output is responsible for showing output and responsible motor speed control system respectively.

Described absolute position detection ring is the magnet steel of a pair of number of pole-pairs, wherein, and magnet steel breach and initial alignment aligned in position during installation.

Described absolute position transducer is N type Hall switch formula position transducer or rheostat position transducer.

The end that described comparator links to each other with absolute position transducer runs into the specific voltage saltus step and then exports zero clearing, and its end that links to each other with the motor relative position sensor is then exported relative angular displacement.

Described relative position sensor is through to the voltage of three position transducers and count measurement wheel hub motor relative angular displacement that one of them position transducer level is changed.

Described relative position sensor becomes 120 ° to be distributed on the wheel hub motor stator respectively.

Described motor speed control system is through controlling and adjust motor speed to the motor speed of relative position sensor and comparator output.

Described motor absolute position transducer, relative position sensor, comparator and motor speed control system are integrated on the position sensor circuit plate.

Following equality is satisfied in the angular displacement of said CT wheel hub electromechanics:

$\mathrm{\ψ}=\frac{\mathrm{\θ}}{6}=\frac{\mathrm{\α}}{6\·p}$

ε＝ψ·ρ

ε′＝K·ε

Wherein, ψ changes corresponding mechanical angle displacement for the relative position sensor signal, and θ changes the mechanical angle displacement of one-period for the relative position sensor signal; α is an electrical degree; P is a relative position detection ring number of pole-pairs, and ρ is a control precision, and ε is the theoretical position precision; ε ' is the physical location precision, and K is a coefficient of safety.

Beneficial effect

Owing to adopted above-mentioned technical scheme, the utility model compared with prior art has following advantage and good effect: behind the utility model process motor initial alignment; The directly rotating speed and the angular displacement thereof of each commentaries on classics of wheel hub motor on the Detection & Controling CT machine; Eliminate accumulated error, had accuracy of detection height, the fast advantage of response speed, easy for installation; Integrated level is high; Greatly reduce cost, thereby can confirm the pathology image more accurately, improved the accuracy and the accuracy of CT machine.

Description of drawings

Fig. 1 is the position probing ring work structuring sketch map of the utility model;

Fig. 2 is the position transducer work period figure (p=2) of the utility model;

Fig. 3 is a motor position layout of the present invention.

Embodiment

Below in conjunction with specific embodiment, further set forth the utility model.Should be understood that these embodiment only to be used to the utility model is described and be not used in the restriction the utility model scope.Should be understood that in addition those skilled in the art can do various changes or modification to the utility model after the content of having read the utility model instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.

The position measuring and controlling device that relates to a kind of CT wheel hub motor wheel hub of the utility model; As shown in Figure 1, comprise relatively to position detection ring 1, definitely to position detection ring 2, absolute position transducer 3, relative position sensor 5, comparator 4 and show output 6 and motor speed control system 7.Described relative position detection ring 1 and absolute position detection ring 2 do not have each other and slide through being connected and fixed together; Describedly relatively position detection ring 1 is linked to each other with relative position sensor 5; Described absolute position detection ring 2 links to each other with absolute position transducer 3; Described position transducer 3 is N type Hall switch formula position transducer or rheostat position transducer; Described comparator 4 links to each other with relative position sensor 5 with absolute position transducer 3 respectively; Described comparator 4 outputs are responsible for showing output 6 and responsible motor speed control system 7 respectively.

As shown in Figure 2, being two pairs with CT machine relative position detection ring number of pole-pairs is example, supposes that the absolute position transducer of initial position aligns with A position relative position sensor.The absolute position detection ring is the magnet steel of a pair of number of pole-pairs, wherein, and magnet steel breach and initial alignment aligned in position during installation.Absolute position transducer is N type Hall switch formula position transducer or rheostat position transducer.The end that comparator links to each other with absolute position transducer runs into the specific voltage saltus step and then exports zero clearing, and its end that links to each other with the motor relative position sensor is then exported relative angular displacement.The motor relative position sensor is through to the voltage of three position transducers and count measurement wheel hub motor relative angular displacement that one of them position transducer level is changed.Relative position sensor becomes 120 ° to be distributed on the wheel hub motor stator respectively.The motor speed control system is through controlling and adjust motor speed to the motor speed of motor relative position sensor and comparator output.Following equality is satisfied in the angular displacement of CT wheel hub electromechanics:

wherein ψ is positional precision; θ is the mechanical angle (being 360 °) of one-period; α is electrical degree (being 720 °), and p is a relative position detection ring number of pole-pairs.

After starting CT wheel hub motor, aliging with absolute position transducer in wait motor initial alignment position, will satisfy the motor speed requirement simultaneously.After motor operating state met the demands, the CT machine got into detected state, the operation of three the collaborative motor speed control system control of relative position sensor motors, and absolute position transducer is revised motor speed after motor whenever turns around, and eliminates the accumulation turning error.Depending on the mechanical angular displacement

there

motor angular displacement absolute accuracy of mechanical angular displacement sensor accuracy of the product.Meanwhile; Counter begins A position relative position sensor is wherein counted in the motor relative position sensor (5); Increase a numerical value then electrical degree be 360 °, mechanical angle increases

can calculate the relative angular displacement of CT wheel hub motor thus accurately.

In addition, with angular displacement absolute measurement precision be ± 1 ' CT wheel hub motor be example, satisfy according to the electromechanics angular displacement:

$\mathrm{\ψ}=\frac{\mathrm{\θ}}{6}=\frac{\mathrm{\α}}{6\·p}$

ε＝ψ·ρ

ε′＝K·ε

Get K=2 according to actual engine request, ρ=1%, ε '=1 ' time, calculating and answering power taking machine number of pole-pairs is 72 pairs.It is thus clear that on the basis that the transducer control precision does not promote, relative position detection ring number of pole-pairs is many more, the angular displacement precision of motor is also just high more.After rotor rotates a circle, can utilize angular displacement and the speed of relation through closed-loop control adjustment motor between CT wheel hub magnetic steel of motor rotor exterior ring and the absolute position transducer, improved the positional precision of CT wheel hub motor greatly.

Be not difficult to find that the utility model is with positioner and the collaborative use of position transducer, through after the initial alignment of motor; Can detect the rotating speed of each commentaries on classics of wheel hub motor; And the rotating speed through motor speed control system control wheel hub motor can make the response characteristic of the utility model be greatly improved in the speed error scope that the CT machine allows like this, improved accuracy of detection; Thereby can confirm the pathology image more accurately, improve the accuracy and the accuracy of CT machine.

Claims (9)

1. the position measuring and controlling device of a CT wheel hub motor wheel hub; Comprise relatively position detection ring (1), absolute position detection ring (2), absolute position transducer (3), relative position sensor (5), comparator (4) and show output (6) and motor speed control system (7), it is characterized in that: describedly relatively position detection ring (1) is linked to each other with motor relative position sensor (5); Described absolute position detection ring (2) links to each other with absolute position transducer (3); Described position transducer (3) is N type Hall switch formula position transducer or rheostat position transducer; Described comparator (4) links to each other with relative position sensor (5) with absolute position transducer (3) respectively; Described comparator (4) output is responsible for showing output (6) and responsible motor speed control system (7) respectively.

2. the position measuring and controlling device of CT wheel hub motor wheel hub according to claim 1 is characterized in that described absolute position detection ring (2) is the magnet steel of a pair of number of pole-pairs, wherein, and magnet steel breach and initial alignment aligned in position.

3. the position measuring and controlling device of CT wheel hub motor wheel hub according to claim 1 is characterized in that, described absolute position transducer (3) can be N type Hall switch formula position transducer or rheostat position transducer.

4. the position measuring and controlling device of CT wheel hub motor wheel hub according to claim 1; It is characterized in that; The end that described comparator (4) links to each other with absolute position transducer (3) runs into the specific voltage saltus step and then exports zero clearing, and its end that links to each other with relative position sensor (5) is then exported relative angular displacement.

5. the position measuring and controlling device of CT wheel hub motor wheel hub according to claim 1; It is characterized in that described motor relative position sensor (5) is through to the voltage of three position transducers and count measurement wheel hub motor relative angular displacement that one of them position transducer level is changed.

6. the position measuring and controlling device of CT wheel hub motor wheel hub according to claim 1 is characterized in that described relative position sensor (5) becomes 120 ° to be distributed on the wheel hub motor stator respectively.

7. the position measuring and controlling device of CT wheel hub motor wheel hub according to claim 1; It is characterized in that described motor speed control system (7) utilizes the motor speed of motor relative position sensor (5) and comparator (4) output to control and adjust motor speed.

8. the position measuring and controlling device of CT wheel hub motor wheel hub according to claim 1; It is characterized in that described motor absolute position transducer (3), relative position sensor (5), comparator (4) and motor speed control system (7) are integrated on the position sensor circuit plate.

9. the position measuring and controlling device of CT wheel hub motor wheel hub according to claim 1 is characterized in that, following equality is satisfied in the angular displacement of said CT wheel hub electromechanics:

$\mathrm{\ψ}=\frac{\mathrm{\θ}}{6}=\frac{\mathrm{\α}}{6\·p}$

ε＝ψ·ρ

ε′＝K·ε

Wherein, ψ changes corresponding mechanical angle displacement for the relative position sensor signal, and θ changes the mechanical angle displacement of one-period for the relative position sensor signal; α is an electrical degree; P is a relative position detection ring number of pole-pairs, and ρ is a control precision, and ε is the theoretical position precision; ε ' is the physical location precision, and K is a coefficient of safety.

Images