CN2565123Y

CN2565123Y - Hall rotary transformer

Info

Publication number: CN2565123Y
Application number: CN 02271092
Authority: CN
Inventors: 王宗培; 程智
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-06-11
Filing date: 2002-06-11
Publication date: 2003-08-06
Anticipated expiration: 2012-06-11

Abstract

The utility model discloses a Hall rotary transformer, which is characterized in that the Hall rotary transformer is composed of linear Hall elements and a permanent magnet magnetic loop, a rotor is made into a hollow shaft structure, one end of the rotor is provided with the permanent magnet magnetic loop, the middle part of the rotor is provided with two roll ball bearings, a stator core body is arranged in a machine shell, small grooves of the built-in linear Hall elements are arranged near the circular surface in the stator core body, lead pins of the Hall elements are connected with a piece of printed circuit board, and the rear end of the rotor is provided with a cover plate. The four linear Hall elements which are mutually staggered electric angles of 90 DEG are arranged on the stator, the middle part of the rotor is provided with the two roll ball bearings, a pressing ring which is arranged on one end of a hollow shaft of the rotor is provided with screw holes which are used for fastening screws, the machine shell of the stator is made into an integral body with a front cover which is provided with spring sheets used for connection, a piece of printed board of a Hall integrated circuit is arranged on the stator, and the rotor is provided with the magnetic loop which is provided with specified numbers of pole pairs and can generate sine distribution and uniform surface magnetic fields.

Description

The Hall resolver

Technical field

The utility model relates to a kind of Hall resolver that is used for brushless servomotor.

Background technology

Existing resolver generally has and structure like the motor type, has stator core, rotor core, stator winding, rotor winding, end cap, bearing and rotating shaft to constitute.During the rotor AC excitation, the amplitude of stator two phase winding output AC voltages is sinusoidal and cosine rule variation with rotor angular displacement, obtains the angle position signal after the demodulation.The design is revolved the change complex structure at tradition, the weak point that production cost is high provides a kind of utility model resolver that does not have stator and rotor winding, and is simple in structure, manufacturing cost is lower, and performance can satisfy the requirement of brushless servomotor drive controlling.Rotor is made hollow shaft structure, and versatility is good, installs and adjusts easily.

The utility model content

The Hall resolver that brushless servomotor is used takes following scheme to realize: a kind of Hall resolver, it is characterized in that: this transformer is made of linear hall element and permanent magnet magnetic ring, rotor is made hollow shaft structure, one end is equipped with permanent magnet magnetic ring, there are two ball bearings the centre, and the stator core body is arranged in the casing, and the sulculus of built-in linear Hall element is arranged near the core body internal circular surfaces, the pin of Hall element is connected on the printed circuit board, and the rear end is added with cover plate.

Four linear hall elements are arranged on the stator, and 90 ° of electrical degrees mutually stagger.

Two ball bearings are arranged in the middle of the rotor.

The screw that has holding screw to use on the trim ring of rotor hollow shaft one end.

Stator cage and protecgulum are made of one, and the spring leaf that connects usefulness is arranged on the protecgulum.

Have the printed board of a Hall integrated circuit on the stator.

Have a magnet ring that can produce the particular pole logarithm of Sine distribution and uniform Surface field on the rotor.

Because the utility model has adopted technique scheme, rotor is a hollow shaft structure; Rotor one end has magnet ring, and the number of poles of magnet ring is the same with brushless servomotor body rotor number of poles, and Surface field distributes along the circumference sinusoidal waveform, and the locus is even at interval, the amplitude high conformity; The rotor other end has radially setscrew, can be used for rotor is fixed on the motor rotary shaft, joins rotation together with motor rotor, can adjust when unclamping screw to revolve the relative position that becomes rotor magnetic pole and motor rotor magnetic pole; There are two ball bearings at the rotor middle part, is used for supporting the stator that revolves change; The core of stator is a linear hall element, and four Hall elements are distributed in and concentric space, rotor magnetic ring surface, and 90 ° of electrical degrees mutually stagger; Hall element is placed in the groove of stator core body, guarantees that by the positional precision of groove the position of Hall element is accurate; The stator core body is placed in the stator cage, and casing is taked the structure with the front end housing one; Connect spring leaf revolving on the rear end cap that set is fixed on motor with one; The pin of Hall element is welded on the printed circuit board, and output signal directly or after suitably handling is drawn; The rear end that Hall revolves change adds a cover plate, and circuit board is covered on inside.

The linear hall element that the Hall resolver is used, the close proportional relation of the magnetic on its output signal and magnet ring surface has nothing to do with rotor velocity, does not revolve the velocity error that has principle the change so it does not resemble tradition; The Hall resolver is not to use conventional electromagnetic induction principle, so thoroughly changed the structure of conventional motor type product magnetic system and winding coil, avoided complicated winding this class technology that rolls off the production line, make novel revolving become the structural manufacturing process simplification, manufacturing cost reduces, it is convenient to use simultaneously, the reliability height.The utility model is used for brushless servomotor.

Description of drawings

Fig. 1 is the structural representation of Hall resolver;

{ a} is the principle schematic diagram of Hall resolver to Fig. 2

Fig. 2 b} is the linear hall element output signal curve.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

With reference to attached Fig. 1 and 2, the Hall resolver that brushless servomotor is used, primary structure constitutes by rotor, stator with the connector of motor.This example is the Hall resolver supporting with the permanent magnet motor of four pairs of utmost points.Rotor magnetic ring 1 is four pairs of utmost points, and is consistent with the motor rotor number of pole-pairs, the close Sine distribution that requires of surperficial magnetic, and four pairs of utmost points are evenly distributed symmetry and high conformity; Armature spindle 2 is used brass material, makes hollow-core construction, is convenient to install; Bearing 3 is installed on the hollow shaft, supports stator again, makes can produce relative motion between the stator and rotor, can guarantee good concentricity again; Rotor pressing ring 4 plays the effect of the axial location that limits bearing, and the position that connects the usefulness holding screw with motor rotor is provided again; Linear hall element 5 has four, 5-1, and 5-2,5-3 and 5-4, the 90 ° of electrical degrees that stagger mutually are distributed in around the magnet ring regularly, and their output signal correspondingly is V1, V2, V3 and V4 shown in curve among Fig. 2 (b).Va=V1-V3, Vb=V2-V4 for synthetic just, cosine two-phase output signal, because of eliminating the precision that even-order harmonic has improved signal; Stator core body 6 is along near the groove that has four to place Hall element the internal circular surfaces, and 90 ° of electrical degrees each other stagger; Stator cage 7 is made of one with front end housing, and the bearing chamber of two bearings is all on protecgulum; Printed circuit board 8 is welded in the pin of Hall element above it, with signal directly or draw after certain circuit conversion; The back shroud 9 of Hall element; Elastic sheet metal 10 is the connectors between Hall resolver and motor bonnet; Fixed screw hole site 11, be fixed on the stator of Hall resolver on the motor bonnet by screw hole after, the stator of Hall resolver does not just have the displacement of tangential (circumferencial direction); Holding screw hole site 12, with holding screw from here screw be screwed into, the rotor and the motor reel of Hall resolver can be joined together, the position signalling of Hall resolver is just represented the position signalling of motor rotor.

Claims

1, a kind of Hall resolver, it is characterized in that: this Hall resolver is made of linear hall element and permanent magnet magnetic ring, rotor is made hollow shaft structure, one end is equipped with permanent magnet magnetic ring, there are two ball bearings the centre, and the stator core body is arranged in the casing, and the sulculus of built-in linear Hall element is arranged near the core body internal circular surfaces, the pin of Hall element is connected on the printed circuit board, and the rear end is added with cover plate.

2. Hall resolver according to claim 1 is characterized in that: four linear hall elements are arranged on the stator, and 90 ° of electrical degrees mutually stagger.

3, Hall resolver according to claim 1 is characterized in that: two ball bearings are arranged in the middle of the rotor.

4. Hall resolver according to claim 1 is characterized in that: the screw that has holding screw to use on the trim ring of rotor hollow shaft one end.

5, according to claim 1 or 2 or 3 or 4 described Hall resolvers, it is characterized in that: stator cage and protecgulum are made of one, and the spring leaf that connects usefulness is arranged on the protecgulum.

6. Hall resolver according to claim 1 is characterized in that: have the printed board of a Hall integrated circuit on the stator.

7. Hall resolver according to claim 1 is characterized in that: have a magnet ring that can produce the particular pole logarithm of Sine distribution and uniform Surface field on the rotor.