CN102931786B - Method for determining positions of brush boxes of direct-current motor with brush ring - Google Patents

Abstract

The invention discloses a method for determining the positions of brush boxes of a direct-current motor with a brush ring. The forward rotation speed n1 and the reverse rotation speed n2 of the direct-current motor with the brush ring, the rated rotation speed n and the speed difference delta<n> of the motor, the saturation coefficient km of the direct-current motor with the brush ring, the external diameter d of a commutator, the distance A between the thickness center lines of electric-brush mounting holes of the two adjacent brush boxes, the ratio B of the diameter D of the position of an armature core groove to the external diameter d of the commutator, and the moving distance delta<x> of the bottom surfaces of the brush boxes on the working surface of the commutator are measured or calculated respectively, so that the positions of the brush boxes of the direct-current motor can be adjusted accurately and quickly, and the production efficiency can be improved greatly.

Description

There is brush holder ring DC motor brush box method for determining position

Technical field

The present invention relates to one and have brush holder ring DC motor brush box method for determining position.

Background technology

For having brush holder ring DC motor, if brush box position is not in the geometric center lines of motor, in the time that Motor Production Test is tested, speed discrepancy between two rotation directions of motor can exceed the requirement of test program, technical conditions and technical papers regulation, commutation to motor causes adverse consequences, if the overproof motor of these rotating speeds is installed on railway locomotive, will cause the electric current maldistribution of locomotive.Therefore, the position of brush box need to be moved to the geometric center lines direction of motor, to reduce the speed discrepancy between motor both direction.

Existing dwindling has brush holder ring DC motor rotation speed poor control method is in the process of the test of motor, by repeatedly moving the position of adjusting brush box, speed discrepancy is down to meet the requirements prescribed, this method of adjustment entirely with artificial experience, need repeatedly carry out test of many times, just can achieve the goal, tool bears the character of much blindness, and adjustment is wasted time and energy, be difficult to once exactly rapid adjustment put in place, reduced the production efficiency of motor.

Summary of the invention

In order to overcome the above-mentioned shortcoming of prior art, the invention provides one has brush holder ring DC motor brush box method for determining position.

The technical solution adopted for the present invention to solve the technical problems is: one has brush holder ring DC motor brush box method for determining position, comprises the following steps:

The first step, measurement have the forward rotation speed n of brush holder ring DC motor ₁with reversion rotation speed n ₂;

Second step, be calculated as follows the rated speed n of motor:

n=(n ₁+n ₂)/2

The 3rd step, be calculated as follows rotation speed difference deltan n:

Δn=n ₁-n ₂

The 4th step, no load saturation characteristic test by motor obtain the saturation coefficient k that has brush holder ring DC motor _u;

The outside dimension d of the 5th step, use vernier caliper measurement commutator;

The 6th step, be calculated as follows on commutator face the distance A between the brush installing hole mid-depth line of adjacent two brush boxs:

$A=\frac{2\mathrm{np}}{\mathrm{\&pi;d}}$

Wherein, the number of pole-pairs that p is motor, for known; π is circumference ratio;

The 7th step, be calculated as follows the ratio B of the diameter dimension D of armature core groove mid point position and the outside dimension d of commutator:

$B=\frac{D}{d}$

The 8th step, be calculated as follows the displacement Δ x of brush box bottom surface on commutator working face:

$\mathrm{\&Delta;x}=\frac{\mathrm{k\&Delta;n}}{{k_u}^{\mathrm{AB}}}$

Wherein, k is for adjusting coefficient, and span is 0.8～1.2.

Compared with prior art, good effect of the present invention is: by method of the present invention, can adjust DC motor brush box position accurately and fast, greatly improve production efficiency.

Embodiment

One has brush holder ring DC motor brush box method for determining position, comprises the steps:

The first step, measurement have the forward rotation speed n of brush holder ring DC motor ₁(unit is r/min) and reversion rotation speed n ₂(unit is r/min):

There is the forward rotation speed n of brush holder ring DC motor ₁with reversion rotation speed n ₂method of measurement be: speed probe is arranged on the measure speed gears of motor, speed probe is connected with computer control system with the electronic measuring instrument of motor test control desk by cable respectively; Allow motor rotate, the tooth of measure speed gears and groove are successively alternately by the sensing element of speed probe, obtain electric impulse signal, this signal by cable transmission to the electronic measuring instrument of motor test control desk, this instrument directly shows the rotating speed of motor, this signal is connected with computer control system simultaneously, also shows motor speed on register face, and this rotating speed is designated as forward rotation speed n ₁; Then allow motor reverse rotation, obtain the rotation speed n of reversing ₂.

Second step, the rated speed n(unit that is calculated as follows motor are r/min):

n=(n ₁+n ₂)/2

The 3rd step, be calculated as follows rotation speed difference deltan n(: the difference of motor forward rotating speed and reversion rotating speed both direction, unit is r/min):

Δn=n ₁-n ₂

The 4th step, no load saturation characteristic test by motor obtain the saturation coefficient k that has brush holder ring DC motor _u;

The 5th step, with the outside dimension d (unit is mm) of vernier caliper measurement commutator;

The 6th step, be calculated as follows on commutator face the distance A (referring to arc length) between the brush installing hole mid-depth line of adjacent two brush boxs:

$A=\frac{2\mathrm{np}}{\mathrm{\&pi;d}}$

Wherein, the number of pole-pairs that p is motor, for known; π is circumference ratio.

The 7th step, be calculated as follows the ratio B of the diameter dimension D of armature core groove mid point position and the outside dimension d of commutator:

$B=\frac{D}{d}$

The 8th step, be calculated as follows the displacement Δ x(of brush box bottom surface on commutator working face in arc length, unit is mm, because the movement of brush box is circular direction, so, refer to the displacement in the arc length of commutator working face)

$\mathrm{\&Delta;x}=\frac{\mathrm{k\&Delta;n}}{{k_u}^{\mathrm{AB}}}$

Wherein: k is for adjusting coefficient, relevant with the factor such as the brush lid coefficient of motor, in general motor, the span of k is 0.8～1.2, under normal circumstances, and k desirable 1.

Claims (3)

1. there is a brush holder ring DC motor brush box method for determining position, it is characterized in that: comprise the following steps:

The first step, measurement have the forward rotation speed n of brush holder ring DC motor ₁with reversion rotation speed n ₂;

Second step, be calculated as follows the rated speed n of motor:

n=(n ₁+n ₂)/2

The 3rd step, be calculated as follows rotation speed difference deltan n:

Δn=n ₁-n ₂

The 4th step, no load saturation characteristic test by motor obtain the saturation coefficient k that has brush holder ring DC motor _u;

The outside dimension d of the 5th step, use vernier caliper measurement commutator;

The 6th step, be calculated as follows on commutator face the distance A between the brush installing hole mid-depth line of adjacent two brush boxs:

$A=\frac{2\mathrm{np}}{\mathrm{\&pi;d}}$

Wherein, the number of pole-pairs that p is motor, for known; π is circumference ratio;

The 7th step, be calculated as follows the ratio B of the diameter dimension D of armature core groove mid point position and the outside dimension d of commutator:

$B=\frac{D}{d}$

The 8th step, be calculated as follows the displacement Δ x of brush box bottom surface on commutator working face:

$\mathrm{\&Delta;x}=\frac{\mathrm{k\&Delta;n}}{k_u\mathrm{AB}}$

Wherein, k is for adjusting coefficient, and span is 0.8～1.2.

2. according to claim 1 have a brush holder ring DC motor brush box method for determining position, it is characterized in that: described k value is 1.

3. according to claim 1 have a brush holder ring DC motor brush box method for determining position, it is characterized in that: described in have the forward rotation speed n of brush holder ring DC motor ₁with reversion rotation speed n ₂method of measurement be: speed probe is arranged on the measure speed gears of motor, speed probe is connected with computer control system with the electronic measuring instrument of motor experiment control desk by cable respectively; Allow motor rotate, the tooth of measure speed gears and groove are successively alternately by the sensing element of speed probe, obtain electric impulse signal, this signal by cable transmission to the electronic measuring instrument of motor experiment control desk, this instrument directly shows the rotating speed of motor, this signal is connected with computer control system simultaneously, also shows motor speed on register face, and this rotating speed is designated as forward rotation speed n ₁; Then allow motor reverse rotation, obtain the rotation speed n of reversing ₂.