JP3257359B2 - Small motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working voltage of 0.5 V to 3 V used for, for example, a tape recorder or a VTR.
The present invention relates to a solder flux used for a sliding contact of a small motor of 0 V, working current: 10 mA to 500 mA.

[0002]

2. Description of the Related Art In the case of a small motor having the largest number of contacts, the brush of the small motor is generally made of a conductive material having elasticity, for example, a thin plate or wire made of copper, beryllium copper or nickel silver. This is a structure in which a noble metal alloy is pressed by heating and pressing. Commutators are also manufactured in a similar manner.

[0003] When a very small amount (1 ppm to 10 ppm) of an organic gas such as an organic silicone or an aromatic hydrocarbon gas is present in an environment in which a small motor is used, the sliding contact material is formed of SiO ₂ or electric Insulating black matter was produced, resulting in poor contact. In addition, when the commutator rotates, abnormal contact occurs on the contact surface of the brush sliding portion with the commutator piece, or the friction coefficient increases due to sliding between the metals.
In some cases, abnormal wear occurred and the life was extremely shortened.

In order to solve this problem, when the inside of the motor case is made into a vapor atmosphere of a polyhydric alcohol (dilute concentration atmosphere having a concentration of 1 ppm or more) (hereinafter referred to as a gaseous lubricant), molecules of the polyhydric alcohol are deposited on the contact surface. Is selectively adsorbed to prevent the adsorption of organic gas, and a lubricating action of itself can provide a high-performance small motor. However, if the solder flux for soldering the terminals remains near the commutator, general abietic acid as a main component of the solder flux is dissolved in the gas-phase lubricant and oozes out to the sliding surface. The abietic acid has a molecular structure that generates an electrically insulating blackened substance, and causes poor contact. Therefore, when using a gas-phase lubricant to improve the motor life, it was necessary to completely clean the solder flux. This process is not preferable because the cost for environmental improvement is enormous in order to maintain the environment of the factory comfortably.

[0005]

The object of the present invention is to omit the cleaning step near the brush and commutator in sliding contact and to further extend the lubrication effect of the gas phase lubricant.

[0006]

In order to solve the above-mentioned problems, a main component of a solder flux used for soldering near a contact is a straight-chain saturated fatty acid.

[0007]

With this configuration, the solder fin used near the contact can be used.
The linear saturated acid, which is an organic acid, is dissolved from the lux to form a thin film on the surface of the contact portion to form a lubricating film of 100 to 500 degrees. This coating prevents aromatic hydrocarbons, such as toluene and xylene, evaporating from the adhesive used in the equipment from adsorbing to the contact surface, preventing the formation of electrically insulating black matter and sliding the brush. This is effective for improving the lubricity of the surface and reducing the contact resistance between the sliding contacts.

[0008]

EXAMPLES Hereinafter, three examples and three comparative examples will be described as methods for using the contact lubricant of the present invention. A gas phase lubricant was prepared by polymerizing 1 mol of propylene oxide to hexylene glycol, and the test environment conditions were 60 ° C. and 90% relative humidity.

The main component of the solder flux is (1) the straight-chain saturated fatty acid is octadecanoic acid.

In the case of a small motor, a brush having a 1 mm width slides in the center of a commutator having an outer diameter of φ mm and a length of 5, and an octadecane is used for soldering terminals near the sliding portion. Use solder flux mainly composed of acid. (2) The linear saturated fatty acid is hexadecanoic acid

In the example of a small motor, in a structure in which a brush having a width of 1 mm slides on the center of a commutator having an outer diameter of φ mm and a length of 5, a octadecane is used for soldering terminals near the sliding portion. Use solder flux mainly composed of acid. (3) Those whose straight-chain saturated fatty acids are hexadecanoic acid and octadecanoic acid

In the example of a small motor, the outer diameter is 2 mm,
A brush with a width of 1 mm slides on the center of a commutator with a length of 5 mm, and a soldering flux mainly composed of octadecanoic acid and hexadecanoic acid is used for soldering terminals near the sliding portion. . (4) to (6) are examples when conventional abietic acid is used. (4) A solder flux in which the main component is conventional abietic acid, the commutator portion is cleaned after soldering, and a gas phase lubricant is used. (5) A solder flux in which the main component is conventional abietic acid and a gas phase lubricant is used without cleaning the commutator portion after soldering. (6) Solder flux whose main component is conventional abietic acid, does not wash the commutator after soldering, and does not use a gas phase lubricant. Table 1 shows the experimental results of Examples (1) to (6) of the example of the present invention and the conventional example.

[0013]

[Table 1]

The life criterion is determined when the wear depth of the commutator exceeds 30 μm measured by a surface roughness meter or measured by a rotation unevenness measuring device based on a test method of Japanese Industrial Standards. The flutter value is 0.1% w in JIS wrms value
Judgment was made at any of the times exceeding rms.

The linear <br/> saturated fatty acids for use as the main component of solder flux, forming a more lubricating film 500Å on the sliding surface of the contacts was dissolved organic acid by melting point of 50 ° C. or less of linear saturated fatty acids As a result, the contact became unstable, and no effect was obtained.

Although not described in detail, tetradecanoic acid, pentadecanoic acid, heptadecanoic acid, nonadecanoic acid, icosanoic acid, henicosanoic acid, docosanoic acid, having a melting point of 50 ° C. or higher are used.
Trichosanoic acid was able to achieve the contact stability and long life of the brush and the commutator as in the example.

[0017]

As apparent from the above description, according to the present invention, (1) a solder flux composed of octadecanoic acid and hexadecanoic acid used in the vicinity of a contact is made of a gas phase lubricant (1 mole of propylene oxide of hexylene glycol). (Polymer) gradually melts by the vapor, and 100 摺 動 to 500Å on the sliding surface
Is formed. Abnormal wear of the sliding contact surface can be prevented by the lubricating action of the formed lubricating film. (2) The solder flux composed of octadecanoic acid and hexadecanoic acid used in the vicinity of the contact is gradually dissolved by the gas phase lubricant to form a lubricating film of 100 ° to 500 ° on the sliding surface. Due to the lubricating action of the formed lubricating film, welding of the sliding surface and abrasion damage due to the welding can be prevented. (3) The solder flux composed of octadecanoic acid and hexadecanoic acid disposed in the vicinity of the contact is gradually dissolved by the gas phase lubricant to form a lubricating film of 100 ° to 500 ° on the sliding surface. Wow and flutter characteristics can be improved by the lubricating action of the formed lubricating film. (4) The solder flux composed of octadecanoic acid and hexadecanoic acid used in the vicinity of the contact is gradually dissolved by the gas phase lubricant to form a lubricating film of 100 ° to 500 ° on the sliding surface. The formed lubricating film prevents the aromatic hydrocarbon gas contained in the solvent that evaporates from the adhesive near the contact from adsorbing to the surface of the contact, thereby preventing the contact from occurring due to the occurrence of poor contact due to the formation of electrically insulating black matter. Protect. As a result, the sliding of the contact is smoothed, the contact failure of the contact is prevented, and the life of the contact is extended.

Claims (3)

(57) [Claims] 1. A small motor used in a range of a working voltage: 0.5 V to 30 V and a working current: 10 mA to 500 mA, wherein terminals are soldered near brushes and commutators.
The soldering flux for this soldering is a linear
Contains saturated fatty acids and contains polyhydric alcohol inside the motor case.
Small motor with steam atmosphere. 2. The linear saturated fatty acid is octadecanoic acid or
2. The small motor according to claim 1, which is composed of hexadecanoic acid.
Ta. 3. Working voltage: 0.5V to 30V, working voltage
Current: small motor used in the range of 10 mA to 500 mA
Soldering the terminals near the brush and the commutator,
The soldering flux for this soldering is a linear
Contains saturated fatty acids and contains polyhydric alcohol inside the motor case.
This is a device equipped with a small motor that creates a steam atmosphere.
Aromatic hydrocarbons are generated from adhesives used in equipment
Equipment.