CN2275717Y - Speed sensor - Google Patents

Abstract

The utility model relates to a speed sensor, belonging to the electromagnetism inducing type. The speed sensor comprises a rotating shaft, a shaft sleeve, a magnetic ring, and an active assembled Hall switching device. The original multipolar magnetic ring which is magnetized in single radial direction is changed into the multipolar magnetic ring 2 that can be magnetized in radial direction and in axial direction. The active assembled Hall switching device 3 fixed on a casing 11 and positioned on the position vertical to a cutting magnetic line comprises a Hall switch 6 and a Hall switch 5 which are in parallel connected, wherein, the Hall switch 6 is used to collect pulse of N direction in magnetic field, and the Hall switch 5 is used to collect pulse of S direction in the magnetic field. The speed sensor shortens the single collecting time, and simultaneously the speed sensor improves the measuring accuracy by one time. The speed sensor has the advantages of small size, convenient installation, corrosion preventive capability, and anti-jamming performance. The speed sensor also cares nothing for pollution.

Description

Speed pickup

The utility model relates to a kind of speed pickup, particularly relates to induction speed pickup.

Speed pickup is a kind of magnetoelectricity transducer part, and speed pickup in the past is owing to limited by physical construction, the magnetic field pulse signal that is collected seldom, its precision can not satisfy the needs in people's work.Utility model patent CN94215066.X has reported a kind of speed pickup, but used Hall switch device can only be to magnetic field N or S to pulse value under certain threshold value, be converted into electric impulse signal, do not make full use of whole magnetic field pulse, make measuring accuracy descend; Used magnet ring is the magnet ring of radial magnetizing mode, and for guaranteeing institute's image data precision, the magnet ring diameter can not dwindle, and can not install the object under test that some space is narrow.

The purpose of this utility model is to overcome existing speed pickup can not make full use of whole magnetic field pulse, can only gather the defective of half magnetic field pulse signal, and overcome because precision improves the defective that just needs to increase sensor bulk, thereby provide a kind of collection magnetic field pulse signal that can make to double, reduce the novel electromagnetic speed pickup of volume simultaneously.

The utility model is achieved in that the speed pickup that comprises turning axle, axle sleeve, magnet ring and active combination Hall switch device.Because the variation of structure, magnet ring 2 is made into both can adopt the radial magnetizing multi-pole magnet-ring by former single radial magnetizing multi-pole magnet-ring, also can adopt the multi-pole magnet-ring of axial charging; Being fixed on housing 11 and being positioned at the locational active combination Hall switch device 3 of the perpendicular cuts magnetic line of force, is the Hall switch 6 and Hall switch 5 from collection magnetic field S to pulse of two collection magnetic field N that are connected in parallel to pulse.

Owing to the utlity model has two active Hall switch of gathering magnetic field pulse, so the loss of just having avoided magnetic field pulse to gather.When turning axle 1 drives magnet ring 2 rotations, the magnetic line of force passes the Hall switch 5 and 6 that is fixed on the housing 11, Hall switch can collect the electric impulse signal by the magnetic field induction that changes, and the pulse signal that will be respectively collects from magnetic field N and magnetic field S, after process or door 7 synthesize, be transported to outside the reception by transmission line 4.

The employed magnet ring of the utility model is permanent magnetism multi-pole magnet-ring or the permanent magnetism multi-pole magnet-ring that has anti-corrosion protection coating, and material can be neodymium iron boron; Turning axle 1 connects as one with axle sleeve 9, rotation synchronously, in order to reduce the relative slip between turning axle and magnet ring, more than one protrusion 8 or groove 10 are arranged on the internal diameter of magnet ring 2, have on the external diameter of the axle sleeve 9 of turning axle with magnet ring 2 on protrusion 8 or corresponding groove 10 of groove 10 quantity or protrusion 8, quantity is decided on actual needs, the groove 10 of protrusion 8 and location is coincide install, and makes magnet ring and axle sleeve after the bonding more firm.

Advantage of the present utility model is the active Hall switch that adopts two to be connected in parallel, can gather N, S two to the magnetic-pulse signal, and the loss when promptly having avoided the magnetic-pulse signals collecting has improved resolution again; The volume of speed pickup and easy for installation has been dwindled in the use of axial charging multi-pole magnet-ring more; This kind sensor also has the pollution of not being afraid of, anticorrosion, advantage such as anti-interference.

Fig. 1-a: magnet ring radial magnetizing formula sensor sectional side elevation

The mode that magnetizes of Fig. 1-b: Fig. 1-a magnet ring

Fig. 2-a: the ring axial magnetic formula sensor sectional side elevation that magnetizes

The mode that magnetizes of Fig. 2-b: Fig. 2-a magnet ring

Fig. 3: active Hall switch assembly circuit figure

Embodiment 1:

As Fig. 1 (a, b) shown in, speed pickup adopts radial magnetizing formula multi-pole magnet-ring 2, magnet ring 2 adopts the nickel plating NdFeB material, have 24 pairs of magnetic poles, three projectioies 8 are arranged on magnet ring 2, three grooves 10 are arranged on the relevant position of axle sleeve 9, magnet ring 2 and axle sleeve 9 correspondences bond together, active Hall switch assembly 3 is fixed on the housing 11 directly over the magnet ring 2, structure is shown in figure three, and wherein Bing Lian Hall switch 5 and 6 adopts commercially available Hall switch 3120, or door 7 adopts commercially available or door 74L series, sensor is connected with automobile soft shaft output outlet by the spiral shell button 12 on its housing 11, measures the speed of a motor vehicle.Make by 24 magnetic-pulses of collection that rotated a circle originally and bring up to 48 magnetic-pulses of collection that rotate a circle, precision doubles.Embodiment 2:

Shown in Fig. 2 (a, b), speed pickup adopts axial charging formula multi-pole magnet-ring 2, and active Hall switch assembly 3 is installed on the housing 11 in magnetic pole dead ahead.Structure, effect are with embodiment 1, and under the same precision, the sensor diameter reduces 10%.

Claims (4)

1. speed pickup, comprise turning axle, axle sleeve, magnet ring and active combination Hall switch assembly, its middle magnetic ring is bonded on the axle sleeve that rotates synchronously with turning axle, active combination Hall switch assembly is positioned on the housing (11) of the perpendicular cuts magnetic line of force, it is characterized in that described Hall switch assembly comprises that two collection N that are connected in parallel are to the Hall switch (6) of magnetic-pulse with gather the Hall switch (5) of S to magnetic-pulse.

2. speed pickup as claimed in claim 1 is characterized in that described magnet ring can adopt the axial magnetizing permanent magnetism multi-pole magnet-ring, also can adopt the radial magnetizing permanent magnetism multi-pole magnet-ring.

3. speed pickup as claimed in claim 1 or 2 is characterized in that described magnet ring is band coating Nd-Fe-B permanent magnetic multi-pole magnet-ring.

4. speed pickup as claimed in claim 1 or 2 is characterized in that on the internal diameter of described magnet ring more than one projection (8) or groove (10) being arranged, and more than one groove (10) or projection (8) are arranged on axle sleeve external diameter relevant position.

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