CN220170262U - Inductance type split encoder - Google Patents

Abstract

The utility model discloses an inductance type split encoder, which comprises a reading head and a grid ring, wherein the reading head comprises a shell, a resolving plate and a coil plate, the resolving plate is fixedly connected in the shell, the coil plate is arc-shaped and is fixedly connected to the side wall of one side of the shell, which faces the grid ring, the arc concave side of the coil plate faces the outer curved surface of the grid ring, an air gap is formed between the outer curved surface of the grid ring and the arc concave side of the coil plate, the coil plate is connected with the resolving plate, the coil plate senses the position of the grid ring to resolve an inductance encoding signal, and the coil plate transmits the sensed inductance signal to the resolving plate, and the resolving plate resolves the position. The utility model can improve the running stability of the encoder, thereby ensuring that the position and speed feedback of the electric spindle is more accurate and stable.

Description

Inductance type split encoder

Technical Field

The utility model relates to the field of encoders, in particular to an inductance type split encoder.

Background

The electric spindle is a new technology developed in the field of numerical control machine tools in recent years, and is a product obtained by integrating a machine tool spindle and a spindle motor. The electric spindle comprises an electric spindle body, a high-frequency conversion device, an oil mist lubricator, a cooling device, a built-in encoder, a tool changing device and the like.

The encoder is an important speed and position feedback device in a servo system, and usually, a rotor of the encoder is assembled coaxially with a spindle, and a reading head stator of the encoder is fixed in a spindle motor shell, so that the spindle drives the rotor to rotate, and the reading head senses the rotor and performs position calculation.

However, most of the encoders widely used at present are photoelectric encoders, and most of grating discs of the photoelectric encoders are made of glass materials, so that the grating discs are easy to crack due to the influence of external environments such as shaft vibration and impact when rotating around a shaft at high speed, and the speed and position feedback of an electric spindle are influenced.

Disclosure of Invention

In order to enable the encoder to operate more stably, the utility model provides an inductance type split encoder.

The utility model provides an inductance type split encoder, which adopts the following technical scheme:

the utility model provides an inductance type components of a whole that can function independently encoder, includes reading head, bars ring, the reading head includes casing, resolving board, coil panel, resolving board fixed connection is in the casing, the coil panel is arc and fixed connection in the casing one side lateral wall towards bars ring, just the arc side of coil panel is towards bars ring curved surface, makes between bars ring curved surface and the coil panel arc side form the air gap, the coil panel is connected with resolving board, the inductance code signal is resolved to the position that the coil panel response bars ring set up, the coil panel will sense inductance signal transmission to resolving board, resolving board resolving position.

Through adopting above-mentioned technical scheme, through setting up the coil panel, and set up the position that supplies the coil panel to respond to on the bars ring and solve inductance code information, the coil panel is the arc and constitutes fixed air gap with bars ring outer curved surface, when the main shaft drives bars ring rotation, the coil panel can stabilize the position that sets up on the response bars ring and solve inductance code signal, and with the signal transmission who senses to the resolving board, the resolving board is through solving the motion position that obtains bars ring, from this through the motion position of the coil panel response bars ring that adopts inductance principle, make whole encoder performance more stable.

Optionally, the coil board is a flexible circuit board, an exciting coil and a receiving coil are arranged on the coil board, the receiving coil receives the coded signals of the grid ring and feeds back the coded signals to the resolving board, and the resolving board resolves the position information.

By adopting the technical scheme, the exciting coil generates an exciting electromagnetic field, an alternating electromagnetic field is generated around the code channel, and because of the eddy current effect, when the receiving coil passes through the grid of the code channel, inductance signals with different phases are received, then the receiving coil sends the received inductance signals to the resolving board, and the resolving board is resolved according to the inductance signals to obtain the movement position.

Optionally, the grid ring comprises a collar and a grid ruler, the grid ruler is circumferentially fixed along the collar, and the grid ruler is provided with a code channel containing coding information.

By adopting the technical scheme, different grid scales can be arranged according to requirements, and the grid scales are fixed on the shaft collar.

Optionally, the code channel is set to a single code channel, and the code channel contains position resolving coding information for coil plate induction, the shaft collar is embedded with a magnet along the radial direction, and the resolving plate is provided with a magnetic sensor for inducing the magnet.

Through adopting above-mentioned technical scheme, when the grid of coil board through the sign indicating number way, the increment position of grid ring is obtained in the resolving board solution, through setting up magnet, and when the grid ring rotated, the intensity and the direction of magnetic field of magnetic sensor perception magnet made magnetic sensor's induction signal parameter change, the resolving board detected the induction signal of change to the position that the magnet that will detect was located is the zero position of encoder.

Optionally, the number of the code channels is at least two, and the code channels contain coding information based on a vernier resolving principle for coil panel induction.

By adopting the technical scheme, the coil plate senses the coded signals of the code channel, and the resolving plate resolves the coded signals sensed by the coil plate by utilizing a vernier resolving principle to obtain the absolute position of the grid ring.

Optionally, the grid ruler is made of a flexible grid ruler or a steel belt.

By adopting the technical scheme, the grid ruler is convenient to fix on the collar.

Optionally, the resolving board is connected with the coil board through a golden finger.

By adopting the technical scheme, the resolving plate is convenient to be connected with the coil plate.

Optionally, the resolving board is a flexible circuit board.

Optionally, the resolving plate is a rigid plate and is integrally made with the coil plate.

Drawings

Fig. 1 is a schematic overall structure of an embodiment of the present utility model.

Fig. 2 is a schematic view of the internal structure of the housing in the embodiment of the present utility model.

Fig. 3 is a schematic view of an arrangement of the gate ring of the present utility model in other embodiments.

Reference numerals illustrate:

1. a read head; 2. a gate ring; 11. a housing; 12. a resolving board; 13. a coil plate; 21. a collar; 22. a grid ruler; 23. coding a channel; 3. a magnet; 4. a magnetic sensor.

Detailed Description

The utility model is described in further detail below with reference to fig. 1-3.

The embodiment of the utility model discloses an inductance type split encoder. Referring to fig. 1 and 2, an inductance type split encoder includes a read head 1 fixed in a motor, and a grating ring 2 coaxially fixed to a spindle, the read head 1 includes a housing 11, a resolving plate 12, and a coil plate 13, the housing 11 is fixed in the motor, and the resolving plate 12 is fixedly connected in the housing 11. The coil plate 13 is a flexible coil plate 13, and the coil plate 13 is arranged in an arc shape and is fixedly connected to the side wall of the shell 11 facing the grid ring 2, and the fixing mode can be glue bonding. The arc concave side of the coil plate 13 faces the outer curved surface of the grid ring 2, so that a fixed air gap is formed between the outer curved surface of the grid ring 2 and the arc concave side of the coil plate 13. In the present embodiment, the resolving plate 12 is a rigid plate and is connected to one end of the coil plate 13 by a gold finger. In other embodiments, the resolving board 12 may be a flexible circuit board, or may be a rigid board and be integrally formed with the coil board 13.

Referring to fig. 1, the grating ring 2 includes a collar 21 and a grating ruler 22, the collar 21 is coaxially fixed with the spindle, the grating ruler 22 is fixedly adhered to an outer curved surface of the collar 21 along the circumferential direction of the collar 21, the grating ruler 22 is provided with a code channel 23 containing information of resolving inductance coding for the position sensed by the coil plate 13, the coding information on the code channel 23 is embodied by arranging a grating, and the grating ruler 22 can be made of a flexible grating ruler 22 or a steel belt.

Referring to fig. 1 and 2, the coil board 13 is provided with an exciting coil and a receiving coil, the exciting coil is disposed around the receiving coil, and the exciting coil generates an exciting electromagnetic field to generate an alternating electromagnetic field around the code channel 23, and due to the eddy effect, when the receiving coil passes through the grid of the code channel 23, inductance signals with different phases are received, and then the receiving coil transmits the received inductance signals to the resolving board 12, so that the resolving board 12 performs resolving to obtain a motion position.

Referring to fig. 1 and 2, in the present embodiment, two code tracks 23 are provided, and the number of grid periods of the two code tracks 23 is equal to each other, the coil board 13 senses the encoded signal of the code track 23 and transmits the signal to the resolving board 12, and the resolving board 12 can resolve the absolute position of the grid ring 2 based on the vernier resolving principle. In other embodiments, the number of the grid periods of at least two bar code tracks 23 is equal to each other, and the number of the grid periods of the remaining bar code tracks 23 is equal to the number of the grid periods of any bar code track 23 in the plurality of bar code tracks 23. The absolute position of the subdivision can be resolved by utilizing the vernier resolving principle, the error code is reduced, and the encoder forms an absolute value encoder.

Referring to fig. 3, in other embodiments, the track 23 may be configured as a single track, and the track 23 is configured to embody the position resolving coding information sensed by the coil board 13 through a grid, so that when the coil board 13 passes through the grid of the track 23, the resolving board 12 resolves the incremental position of the grid ring 2 to form an incremental encoder, and for the incremental encoder, it is necessary to set a zero position of the encoder, so that the collar 21 is embedded with the magnet 3 along the radial direction thereof, the magnet 3 is adhered in the collar 21 by glue, the resolving board 12 is fixed with the magnetic sensor 4 for sensing the magnetic field of the magnet 3, and the magnetic sensor 4 may be a hall sensor.

When the grid ring 2 rotates, the Hall sensor senses the intensity and the direction of the magnetic field of the magnet 3, so that the sensing signal parameters of the Hall sensor are changed, the resolving board 12 detects the sensing signal of the Hall sensor, and the detected position of the magnet 3 is determined as the reference zero position of the incremental encoder. Therefore, the encoder can set the number of code channels according to the application requirement of the electric spindle, and can realize an incremental encoder or an absolute encoder by adaptively matching with a corresponding resolving circuit, so that the position speed of the electric spindle can be detected more stably, wherein the resolving circuit is in the prior art and is not described herein.

The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (9)

1. An inductance type split encoder, characterized in that: including read head (1), bars ring (2), read head (1) include casing (11), calculate board (12), coil panel (13), calculate board (12) fixed connection in casing (11), coil panel (13) are arc and fixed connection in casing (11) one side lateral wall towards bars ring (2), just the arc side of coil panel (13) is towards bars ring (2) curved surface, makes between bars ring (2) curved surface and coil panel (13) arc side formation air gap, coil panel (13) are connected with calculate board (12), coil panel (13) induction grid ring (2) set up the position and calculate inductance code signal, coil panel (13) are with the inductance signal transmission that senses to calculate board (12), calculate board (12) and calculate the position.

2. An inductive split encoder according to claim 1, wherein: the coil board (13) is a flexible circuit board, the coil board (13) is provided with an exciting coil and a receiving coil, the receiving coil receives the coded signals of the grid ring (2) and feeds back the coded signals to the resolving board (12), and the resolving board (12) resolves the position information.

3. An inductive split encoder according to claim 2, wherein: the grid ring (2) comprises a shaft collar (21) and a grid ruler (22), wherein the grid ruler (22) is circumferentially fixed along the shaft collar (21), and the grid ruler (22) is provided with a code channel (23) containing coding information.

4. An inductive split encoder according to claim 3, wherein: the code channel (23) is set to be a single code channel, the code channel (23) comprises position resolving coding information for induction of the coil plate (13), the shaft collar (21) is embedded with the magnet (3) along the radial direction of the shaft collar, and the resolving plate (12) is provided with the magnetic sensor (4) for inducing the magnet (3).

5. An inductive split encoder according to claim 3, wherein: the number of the code channels (23) is at least two, and the code channels (23) contain coding information based on a vernier resolving principle for induction of the coil panel (13).

6. An inductive split encoder according to claim 3, wherein: the grid ruler (22) is made of flexible grid ruler (22) or steel strips.

7. An inductive split encoder according to claim 1, wherein: the resolving plate (12) is connected with the coil plate (13) through a golden finger.

8. An inductive split encoder according to claim 1, wherein: the resolving board (12) is a flexible circuit board.

9. An inductive split encoder according to claim 1, wherein: the resolving plate (12) is a rigid plate and is integrally formed with the coil plate (13).