CN100485319C

CN100485319C - Magnetic coder

Info

Publication number: CN100485319C
Application number: CNB2006100676749A
Authority: CN
Inventors: 桥本克博; 梁川敏; 浦崎雄三
Original assignee: Koyo Electronics Industries Co Ltd
Current assignee: Koyo Electronics Industries Co Ltd
Priority date: 2005-11-11
Filing date: 2006-03-23
Publication date: 2009-05-06
Anticipated expiration: 2026-03-23
Also published as: CN1963397A; TW200718921A; TWI298098B; KR20070050748A; KR100804361B1; JP2007132862A

Abstract

The present invention provides a minitype high resolution (for example 10 bit) magnetic coder, which can be arranged even at scanty space. The magnetic coder of the present invention is provide with: a magnet (12) fixed on the top of the shaft (11); an IC chip (14) having a hall element (13) for detecting the variation of the magnetic field that rotates with the magnet (12), computing the rotation angle of the shaft (11) based on the detection for the hall element (13), and generating plurality of signals based on the rotation angle information; and plurality of circuit parts, for outputting the plurality of signals generated from the IC chip (14) respectively. The coder equips the magnet (12) provided with the shaft (11) and the IC chip (14) as the coder main body (10), connects the guide cable (20) to the coder main body (10), and equips the guide cables (20, 21) with a transfer part (30), which is provided with plurality of electric parts (32-34) and electrical source circuit part (31) for supplying electrical source to the coder main body (10).

Description

Magnetic encoder

Technical field

The anglec of rotation that the present invention relates to for example to be used in each joint of articulated robot detects, the small-sized magnetic encoder in the control of the position probing of automobile steering wheel or brushless DC motor.

Background technology

As existing magnetic encoder, the scrambler that is arranged in the stepper motor for example being arranged. it comprises: magnet is installed in the rotor yoke outer peripheral face on the turning axle that is arranged at stepper motor; The 1st track is installed in the outer peripheral face of magnet; The 2nd track is arranged on the end face with the 1st track quadrature; Multipole magnetization portion is arranged on the 1st track; The one pole portion of magnetizing is arranged on the 2nd track; 2 magnetic detecting elements are to be provided with multipole magnetization portion and the one pole opposed mode of portion that magnetizes respectively; And circuit substrate, the circuit block (for example with reference to patent documentation 1) of the output signal that is used to handle these 2 magnetic detecting elements is installed.

[patent documentation 1] spy open the 2004-144497 communique (the 6th page the-the 7th page, Fig. 1)

Though in the above-mentioned patent documentation 1 technology of record effectively utilized magnet periphery and with the end face of its quadrature, and the axial thickness of magnetic encoder is done thin,, seeking there is restriction in the miniaturization.

Summary of the invention

The present invention makes for solving above-mentioned problem, even its purpose is to provide a kind of size small-sized high resolution (for example 10bit) magnetic encoder that the little place narrow and small in the space also can be provided with.

Magnetic encoder of the present invention has: magnet, anchor at the axle the top; Arithmetic processing section has Hall element, and this Hall element detects the changes of magnetic field of the rotation of following this magnet, based on the detection of this Hall element the rotation angle of axle is carried out computing, and, generate a plurality of signals based on this rotary angle information; And a plurality of circuit parts, to output to the outside respectively by a plurality of signals that arithmetic processing section generates, wherein this scrambler will have the axle magnet and arithmetic processing section be provided as the scrambler main part, lead cable is connected on this scrambler main part, and then on lead cable, being equipped with transhipment department, this transhipment department has a plurality of circuit parts and the scrambler main part is carried out the power circuit part that power supply is supplied with.

In the present invention, be provided as the scrambler main part owing to will have the magnet and the arithmetic processing section of axle, on the lead cable that is connected on this scrambler main part, be equipped with transhipment department with a plurality of circuit parts and power circuit part, so, can make the shape of scrambler main part littler, even have the effect that the place narrow and small in the space also can be provided with.

Description of drawings

Fig. 1 is the outside drawing of the magnetic encoder of expression embodiments of the present invention.

Fig. 2 is the block diagram of the summary structure of expression magnetic encoder.

Embodiment

Fig. 1 is the outside drawing of the magnetic encoder of expression embodiments of the present invention, and Fig. 2 is the block diagram of the summary structure of expression magnetic encoder.

The magnetic encoder of present embodiment comprises: the lead cable 21 on scrambler main part 10, the other end that is connected to lead cable 20 on the scrambler main part 10, transhipment department 30 that an end is connected with this lead cable 20 and is connected to this transhipment department 30.This lead cable 21 is connected on the not shown controller.

As shown in Figure 2, scrambler main part 10 is equipped with: axle 11; Magnet 12 is installed in axle 11 top ends, has for example magnetic flux density of 12kGs; And IC chip 14 (arithmetic processing section), Hall element 13 is installed, this Hall element 13 detects the changes of magnetic field of the rotation of following magnet 12.Be mounted on the substrate though this IC chip 14 is not shown, scrambler main part 10 itself is covered by the covers 15 of magnetic material. by the influences of these cover 15 shieldings from the magnetic field of outside.

Described Hall element 13 serves as that axle is that arranged spaced is around it with 90 degree with the center of IC chip 14.IC chip 14 comes the rotation angle of axle 11 is carried out computing based on the signal from Hall element 13, and, form with pwm signal and digital signal (serial communication is used) is exported its absolute data (absolute data) (rotary angle information), simultaneously, generate increment signal. as this increment signal, the commutation signal (U phase V phase W phase signals) of A phase B phase signals, brushless DC motor etc. is arranged, sets the switching of carrying out these signals by signal mode.

Transhipment department 30 constitutes: go up at substrate (not shown) power circuit part 31, low-pass filter portion 32, communication interface part 33 and output circuit 34 are installed, and by cover 35 coverings. power circuit part 31 is the power supply 5V constant voltageization of self-controller in the future, and offer scrambler main part 10. low-pass filter portions 32 pwm signal is transformed to simulating signal. be not provided with in transhipment department 30 under the situation of this low-pass filter portion 32, pwm signal is transmitted to controller.When communication interface part 33 receives the request of numerical data of rotation angle at slave controller, give IC chip 14 with this advisory, when the digital signal (definitely) that received according to this notice from IC chip 14, just this signal is passed on (serial) give controller. output circuit 34 will be exported to controller from the increment signal of IC chip 14.

Like this, be used as scrambler main part 10 owing to be equipped with magnet 12 and IC chip 14 with axle 11, between the lead cable 21 that is connected to the lead cable 20 on this scrambler main part 10 and is connected with controller, setting has the transhipment department 30 of power circuit part 31, low-pass filter 32, communication interface part 33 and output circuit 34, so, it is the scrambler main part 10 of 15mm * 15mm * 22mm that physical dimension can be provided, therefore, even have the effect that the place narrow and small in the space also can be provided with.

Claims

1. magnetic encoder has:

The scrambler main part, this scrambler main part comprises: revolvable axle; Magnet anchors at this top; Hall element, the changes of magnetic field of the rotation of this magnet is followed in detection; And arithmetic processing section, come the rotation angle of described axle is carried out computing based on the detection of this Hall element, and generate a plurality of signals based on this rotary angle information; And

A plurality of circuit parts will output to the outside respectively by a plurality of signals that described arithmetic processing section generates,

Wherein, described arithmetic processing section constitutes with the IC chip,

Described magnet, described Hall element and described IC chip are housed in the cover of magnetic material, and described axle is outstanding from this cover,

Connect lead cable on described scrambler main part, be equipped with transhipment department on this lead cable, this transhipment department has described a plurality of circuit part and described scrambler main part is carried out the power circuit part that power supply is supplied with.