CN218673685U

CN218673685U - Induction type absolute value encoder

Info

Publication number: CN218673685U
Application number: CN202223016309.9U
Authority: CN
Inventors: 陈权
Original assignee: Zhejiang Ruiying Sensing Technology Co ltd
Current assignee: Zhejiang Ruiying Sensing Technology Co ltd
Priority date: 2022-11-10
Filing date: 2022-11-10
Publication date: 2023-03-21
Anticipated expiration: 2032-11-10

Abstract

The application discloses induction type absolute value encoder, including fixed connection in the metal grid chi of equipment frame and just realize relative motion's reading head with the metal grid chi, the metal grid chi is provided with a plurality of code channels along its length direction, a plurality of graduations have been seted up to the code channel, and are a plurality of the graduation cycle length of code channel is different, the reading head contains a plurality of reading parts with each code channel one-to-one setting, reading parts can receive different phase signal when the code channel, makes vernier resolving circuit in the reading head resolves the absolute position of processing confirmation reading head for the metal grid chi based on the signal that reading parts received. The method has the effects of expanding the application range and improving the precision.

Description

Induction type absolute value encoder

Technical Field

The application relates to the field of encoders, in particular to an inductive absolute value encoder.

Background

With the development of industrial automation becoming faster and faster, the demand of various industries on linear encoders is becoming greater and greater. The current linear encoder mainly adopts a photoelectric type and a magnetoelectric type, and the photoelectric encoder is easily influenced by environmental pollution and environmental light, so that the photoelectric encoder is interfered during detection, and the reliability and the precision are influenced; the magnetoelectric encoder is easily interfered by an external magnetic field to cause code channel distortion, so that the resolution and the precision are relatively low.

In order to solve the problems, an inductive encoder is generated based on an inductive principle, although the requirement on the environment is not high, the existing inductive encoder is mainly of an incremental type, the position of the incremental encoder is determined by counting pulse accumulation of an in-situ reference, the reading state is always continuous, uninterrupted and poor in anti-interference capability, the position or the angle of the existing encoder cannot be known when the encoder is started in a motion control system every time, and the inductive encoder is mainly used for short-time relative displacement or speed measurement, so that the application occasion of the encoder is limited.

SUMMERY OF THE UTILITY MODEL

In order to expand the application range, the application provides an induction type absolute value encoder.

The application provides an induction type absolute value encoder adopts following technical scheme:

the utility model provides an induction type absolute value encoder, includes fixed connection in the metal grating chi of equipment rack and just to realizing relative motion's reading head with the metal grating chi, the metal grating chi is provided with a plurality of code channels along its length direction, a plurality of graduations have been seted up to the code channel, and are a plurality of the graduation cycle length of code channel is different, the reading head contains a plurality of reading parts with each code channel one-to-one setting, reading parts can receive different phase signal when the code channel, makes vernier resolving circuit in the reading head is based on the signal that reading parts received and is resolved the absolute position of processing confirmation reading head for the metal grating chi.

By adopting the technical scheme, the reading head and the metal grid ruler move relatively, each reading part inside the reading head corresponds to each code channel, the reading part can receive signals of different phases when passing through the code channels, the vernier resolving circuit in the reading head resolves the received signals according to the vernier principle, so that the absolute position of the reading head relative to the metal grid ruler is obtained, namely, zero position searching is not needed, the encoder is not limited to short-time measurement, meanwhile, the metal grid ruler is adopted by utilizing inductance, environmental pollution is not needed to be worried, the manufacturing precision of the metal grid ruler is high, the encoder can be applied to other high-end occasions, and the application range is expanded.

Optionally, when the number of the code channels is two, the scribing period lengths of the two code channels are relatively prime in the full-length range of the metal grating ruler.

By adopting the technical scheme, the absolute position in the full-length range of the metal grating ruler can be calculated by the vernier principle without finding a zero position.

Optionally, when the number of the code channels is more than two, in the full length range of the metal grating ruler, the number of the scribing periods of at least two code channels is relatively prime, and a common divisor exists between the number of the scribing periods of the remaining code channels and the number of the scribing periods of any one of the plurality of code channels which are relatively prime.

By adopting the technical scheme, the scribing periods of the multiple code channels can form multiple coincidences in the full-length range, and the vernier principle is used for resolving, so that the more subdivided positions in the full-length range of the metal grating ruler can be resolved, the error code is reduced, and the accuracy is improved.

Optionally, the reading component includes an excitation coil and a receiving coil which are arranged in the reading head, the excitation coil surrounds the receiving coil, the excitation coil and the receiving coil are respectively connected with a vernier resolving circuit in the reading head, and the set length of the receiving coil is several times of the length value of the reticle period of the corresponding code track along the length direction of the metal grating ruler.

By adopting the technical scheme, when the reading head and the metal grid ruler move relatively, the exciting coil emits a high-frequency exciting signal, so that an alternating electromagnetic field exists in a code channel of the metal grid ruler, the receiving coil can receive signals of different phases when the reading head passes through a scribed line of the code channel, a vernier resolving circuit in the reading head resolves the signals based on the vernier principle, and the absolute position of the reading head on the metal grid ruler is obtained.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the reading head and the metal grid ruler move relatively, each reading part inside the reading head corresponds to each code channel, the reading part can receive signals of different phases when passing through the code channels, a vernier resolving circuit in the reading head resolves the received signals according to the vernier principle, and therefore the absolute position of the reading head on the metal grid ruler is obtained, namely zero position searching is not needed, the encoder is limited to short-time measurement, meanwhile, the metal grid ruler is adopted in an inductance mode, environmental pollution does not need to be worried, the manufacturing precision of the metal grid ruler is high, the encoder can be applied to other high-end occasions, and the application range is expanded.

2. The scribing periods of the code channels can be overlapped for many times in the full-length range, and the vernier principle is used for resolving, so that the positions which are subdivided in the full-length range of the metal grating ruler can be resolved, error codes are reduced, and the accuracy is improved.

Drawings

FIG. 1 is a side view of an embodiment of the present application.

Fig. 2 is a schematic partial structure diagram of a metal grid ruler in the embodiment of the present application.

FIG. 3 is a schematic structural diagram of a reading part in the embodiment of the present application

Description of reference numerals:

1. a metal grid ruler; 2. a reading head; 3. code channel; 4. scribing; 5. a reading component; 51. an exciting coil; 52. and a receiving coil.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses an induction type absolute value encoder. Referring to fig. 1 and 2, an induction type absolute value encoder includes a metal grid 1 fixedly connected to an apparatus frame, and a reading head 2 directly facing the metal grid 1 and performing relative movement, where the metal grid 1 and the apparatus frame may be fixed by bonding or welding. The metal grating ruler 1 is arranged along the moving direction of a measured object, the reading head 2 is parallel to the metal grating ruler 1, the metal grating ruler 1 is provided with a plurality of code channels 3 along the length direction of the metal grating ruler, the code channels 3 are distributed along the width direction of the metal grating ruler 1 at equal intervals, the code channels 3 are provided with a plurality of scribed lines 4 along the length direction of the code channels 3, and the periodic lengths of the scribed lines 4 of the code channels 3 are different.

Referring to fig. 2 and 3, the reading head 2 includes a plurality of reading parts 5 that are arranged in one-to-one correspondence with the code channels 3, each reading part 5 includes an exciting coil 51 and a receiving coil 52, the exciting coil 51 and the receiving coil 52 are both arranged on a circuit board in the reading head 2, the exciting coil 51 surrounds and surrounds the receiving coil 52, the exciting coil 51 and the receiving coil 52 are respectively connected with a cursor resolving circuit in the reading head 2, and the setting length of the receiving coil 52 is several times of the length value of the period of the scribed line 4 of the code channel 3 corresponding to the receiving coil in the length direction of the metal grating 1.

The exciting coil 51 is used for sending out a high-frequency exciting signal to generate an alternating electromagnetic field in space, so that when the reading head 2 passes through the reticle 4 of the code channel 3 of the metal grid ruler 1, eddy current effects generated on the reticle 4 by the space electromagnetic field are different, the receiving coil 52 can receive signals with different phases, a vernier resolving circuit in the reading head 2 carries out resolving processing on the signals based on a vernier principle according to the received signals, and the absolute position of the reading head 2 relative to the metal grid ruler 1 is determined.

Referring to fig. 2, when the number of the code tracks 3 is set to be more than two, in the full length range of the metal grating ruler 1, the number of periods of the scribed lines 4 of at least two code tracks 3 is prime, and the number of periods of the scribed lines 4 of the rest code tracks 3 and the number of periods of the scribed lines 4 of any one code track 3 in the prime code tracks 3 have a common divisor, so that the periods of the scribed lines 4 of a plurality of code tracks 3 can form multiple coincidences in the full length range of the metal grating ruler 1, and the vernier principle is used for resolving, so that subdivided positions in the full length range of the metal grating ruler 1 can be resolved, error codes are reduced, and accuracy is improved, and fig. 2 shows three reading parts 5 corresponding to fig. 3 by taking three code tracks as an example. In other embodiments, the number of the code channels 3 may also be two, the number of periods of the scribed lines 4 of the two code channels 3 is relatively prime, and the number of the corresponding reading parts 5 is two, so that the absolute position in a full-length range can be calculated according to the vernier principle, but the accuracy is low, and the method can be applied to occasions with low accuracy requirements.

The implementation principle of the embodiment of the application is as follows: the reading head 2 and the metal grating ruler 1 move relatively, each reading part 5 in the reading head 2 corresponds to each code channel 3, the reading parts 5 can receive signals with different phases when passing through the code channels 3, and a vernier resolving circuit in the reading head 2 resolves the received signals according to the vernier principle, so that the absolute position of the inductive linear encoder is determined by utilizing the vernier principle, namely, zero position searching is not needed, error codes are reduced, and accuracy is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides an induction type absolute value encoder, includes fixed connection in the metal grating chi (1) of equipment rack and just right and realize relative motion's reading head (2) with metal grating chi (1), its characterized in that: metal grating chi (1) is provided with a plurality of code channels (3) along its length direction, a plurality of graduations (4) have been seted up in code channel (3), and a plurality of graduations (4) cycle length of code channel (3) are different, reading head (2) include reading part (5) that a plurality of and each code channel (3) one-to-one set up, reading part (5) can receive different phase signal when code channel (3) is passed through, make vernier resolving circuit in reading head (2) is based on the signal that reading part (5) received and is resolved the absolute position of processing definite reading head (2) for metal grating chi (1) is solved.

2. An inductive absolute value encoder according to claim 1, characterized in that: when the number of the code channels (3) is two, the periodic numbers of the scribed lines (4) of the two code channels (3) are relatively prime in the full-length range of the metal grating ruler (1).

3. An inductive absolute value encoder according to claim 1, characterized in that: when the number of the code channels (3) is more than two, in the full-length range of the metal grating ruler (1), the period number of the scribed lines (4) of at least two code channels (3) is relatively prime, and a common divisor exists between the period number of the scribed lines (4) of the rest code channels (3) and the period number of the scribed lines (4) of any one code channel (3) in the plurality of code channels (3) which are relatively prime.

4. An inductive absolute value encoder according to claim 1, characterized in that: the reading part (5) comprises an exciting coil (51) and a receiving coil (52) which are arranged in the reading head (2), the exciting coil (51) surrounds the receiving coil (52) to be arranged, the exciting coil (51) and the receiving coil (52) are respectively connected with a vernier resolving circuit in the reading head (2), and the setting length of the receiving coil (52) is a plurality of times of the length value of the period of the reticle (4) of the code channel (3) corresponding to the receiving coil along the length direction of the metal grating ruler (1).