CN200950062Y - CAN bus output incremental encoder - Google Patents

Abstract

The utility model belongs to the technical field of instruments relating to a output increment mode coder for a CAN bus which is applied to measure the rotation, translation and mechanical displacement, etc. of an object. The coder comprises a shell (1), a bearing (2), a rotary shaft (3), a precision intelligence processing circuit (4), an output electrical wire(5), a magneto sensor (6), a setover permanent-magnet(7), and a gear(8). The bearing is tightly matched with the shell (1) and the rotary shaft (3) is over matched with the inner diameter of the bearing. The precision intelligence processing circuit (4), output electrical wire (5), and the magneto sensor (6) are all fixed on the circuit board of the shell (1). The setover permanent-magnet (7) is stuck on the back of the magneto sensor and the gear (8) is fixed on the rotary shaft (3). The utility model can be applied in broad industries and carry through data communications through the CAN bus. The utility model has the advantages of long transmission distance, high anti-jamming capacity, simple system collocation, and high reliability. Compared with a traditional sensor which measures through a code wheel, the utility model has a high anti-vibration and shock resistance capacity.

Description

A kind of CAN bus output type incremental encoder

Technical field

The invention belongs to instrument field, relate to a kind of CAN bus output type increment type magnetic coder, be used for the rotation of Measuring Object, translation and mechanical shift etc.

Background technology

The incremental encoder of domestic production at present is generally based on the raster count principle, carrying out pulse by glass or plastics code-disc judges, the anti shock and vibration ability, be subject to the interference of dust and foreign material, when under mal-conditions such as off-road vehicle, using especially, through regular meeting the misdescription number takes place, error of omission number and code-disc are cracked, cause the phenomenon of thrashing; Common scrambler only provides A, B has the signal of phasic difference mutually, by the user carry out when the system integration signal Processing carry out step-by-step counting and declare to, because the output of signal distance is limited, when sensor when controller distance is far away, then can produce the decay or the distortion of signal, influence the stable of control system.Along with control system develops to the distributed bus direction, adopting fieldbus to carry out system interconnect is a kind of trend.It is interconnected to be dispersed in the on-the-spot sensor of control, controller etc. by fieldbus, can significantly reduce interconnect cable, improves the reliability of antijamming capability and signal transmission.

Summary of the invention

The purpose of this patent is to provide a kind of novel incremental encoder based on magnetosensitive sensed quantity principle, adopt the non-cpntact measurement principle, long service life, antijamming capability and environmental pollution ability are strong, can the misdescription number, by popular fieldbus---the CAN bus is carried out data transmission, is convenient to data setting and system group network.

A kind of CAN bus output type increment type magnetic coder is made of shell 1, bearing 2, rotation axis 3, precision intelligence treatment circuit 4, output electric wire 5, magnet-sensitive element 6, biasing permanent magnet 7, gear 8.Bearing 2 and shell 1 wringing fit, rotation axis 3 excessively cooperates with bearing bore diameter, and precision intelligence treatment circuit 4, output electric wire 5, magnet-sensitive element 6 all are fixed on the wiring board of shell 1, biasing permanent magnet 7 is bonded at the magneto sensor back, gear 8 is fixed on the rotation axis 3.

Working sensor principle: be to add a permanent magnet in the magnet-sensitive element back, when the measure speed gears of irony rotates,, make magnet-sensitive element can detect its different variation because the top of gear is different to the magnetic circuit influence with root, by processing of circuit, just can produce corresponding waveform signal.If place two magnet-sensitive elements simultaneously, and adjust and place certain spacing, the variation that all can produce signal during by two magnet-sensitive element detection faces when tooth top and tooth paddy, adjust circuit by postorder, generation two-way A phase, B have the pulse signal of position to difference mutually, treatedly can become square-wave pulse signal, general phase differential is controlled at about 90 degree.When gear rotates, tooth of every mistake, the oscillogram that rotating is exported respectively such as Fig. 1, Fig. 2.Send into follow-up Intelligent treatment circuit through the standard square-wave waveform after the conditioning, by single-chip microcomputer according to A, the wave sequence of B two-phase is rotated discriminating direction and counts, and pass through CAN bus controller and transceiver with the count value teletransmission, gear 8 is fixed on the rotation axis 3, when rotation axis 3 is subjected to extraneous power rotation, driven gear rotates, can make the variation that magnetic flux takes place owing to the existence of biasing permanent magnet 7 near its magnet-sensitive element 6 (two one group) simultaneously, it changes the pulse signal that the generation two-way has phase differential, processing through precision intelligence treatment circuit 4, be converted into the dephased square-wave signal of two independent, the signal that has certain phase differential then send into the rear end by single-chip microcomputer constitute the intelligent data processing unit declare mutually and counting, can calculate the size of speed and displacement, and by the CAN bus circuit data be spread out of by output lead 5 according to certain communication protocol.Entire device is sealed in the shell 1.So just reached principle described above.

Principal feature of the present invention comprises: (1) adopts novel magnet-sensitive element (mistor), and the iron and steel material quality magnetic conductor triggers, and adopts non-contact measurement, do not have contact material, thereby the life-span is long, and the product reliability height is sturdy and durable; (2) frequency response wide (beginning to 30KHZ) from static state, good stability, anti-interference strong, in amplification and rectification circuit is arranged, stable output signal.(3) built-in intelligent controller, can carry out data declare to and the counting, can measure the displacement of bidirectional-movement and the angle value of positive and negative angular turn; (4) sensor has position maintenance function, can measure since 0 rotating speed; (5) carry out data transmission by the CAN bus, it is long to have transmission range, the advantage that antijamming capability is strong; (6) can be configured sign (ID) and the transfer rate that sensor carries out node number, information frame by the CAN bus, and can onlinely carry out null value and demarcate processing, networking and easy to use.

Product of the present invention is the encoding measurement equipment of high reliability, and it is wide to be suitable for industry, applied range, applicable to multiple industrial applications, satisfy the angle displacement measurement and the angular velocity measurement requirement of rotary part, by certain mechanical motion conversion, can also slotted line displacement and linear velocity.Adopt the mistor measuring technique, pass through non-contact measurement, significantly improved the ability of the anti-bad working environments of sensor, compare by the code-disc measured sensor with tradition, anti-vibration, impact capacity are strong, be applicable to the occasion that environment is more abominable, as fields such as oil recovery machiner, engineering machinery, haulage vehicle, military job that requires special skills machineries.Carry out data communication by the CAN bus, long transmission distance, antijamming capability is strong, can be easily carries out combined network communication with existing industrial field bus system, and system configuration is simple, the reliability height.

Description of drawings

Fig. 1 is that gear of the present invention is just changeing the oscillogram that is spread out of by sensor.

Fig. 2 is the oscillogram that gear counter-rotating of the present invention is spread out of by sensor.

Fig. 3 is that signal of the present invention receives and send the processing unit block diagram

Fig. 4 is a structural representation of the present invention

Embodiment

A kind of CAN bus output type increment type magnetic coder is made of shell 1, bearing 2, rotation axis 3, precision intelligence treatment circuit 4, output electric wire 5, magnet-sensitive element 6, biasing permanent magnet 7, gear 8.Bearing 2 and shell 1 wringing fit, rotation axis 3 excessively cooperates with bearing bore diameter, on the wiring board that precision intelligence treatment circuit 4 usefulness screws are fixed on shell 1 wiring board, output electric wire 5, magnet-sensitive element 6 are welded in shell 1, all be fixed on the wiring board of shell 1, biasing permanent magnet 7 usefulness epoxy resin are bonded at the magneto sensor back, gear 8 usefulness jump rings are fixed on the rotation axis 3.

Claims (1)

1. a CAN bus output type incremental encoder is characterized in that magnetic coder is made of shell (1), bearing (2), rotation axis (3), precision intelligence treatment circuit (4), output electric wire (5), magnet-sensitive element (6), biasing permanent magnet (7), gear (8); Bearing (2) and shell (1) wringing fit, rotation axis (3) excessively cooperates with bearing bore diameter, and precision intelligence treatment circuit (4), output electric wire (5), magnet-sensitive element (6) all are fixed on the wiring board of shell (1), biasing permanent magnet (7) is bonded at the magneto sensor back, gear (8) is fixed on the rotation axis (3).

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