AU2018100902A4 - Reducing condensation in low voltage electric motors - Google Patents

Abstract

The present invention relates to the field of perceptual-cognitive training. More specifically, the present disclosure relates to a perceptual-cognitive-motor learning system and method for evaluating or improving perceptual-cognitive abilities of a subject during successive tests. The apparatus includes a display configured to provide to the subject a visual contact with an environment. The system also comprises means for consolidating results of first successive tests made using a single spatial zone formed by the environment, means for segmenting the environment into a plurality of spatial zones, and means for consolidating results of second successive tests made using the plurality of spatial zones. -tiller permanen[ magng housing fillIr

Description

AN ARRANGEMENT FOR REDUCING CONDENSATION Background of the Invention

This invention relates to an arrangement for reducing condensation in Permanent Magnet DC electric motors.

Description of the Prior Art

Reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that the prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavor to which this specification relates.

There are applications requiring DC electric motors to operate in an environment where condensation occurs internally. A typical example is on the decks of boats. In this case the electric motor may be operating in warm temperatures then cooled quickly by water spray. Changing temperatures, particularly when the motor is not operational, allows for the humid air inside the motor to condense. Water build up inside the motor is detriment to its operational life. Corrosion to the armature, the commutator and the brush holders is imminent.

Condensation inside the motor is often confused with ingress of water.

This has led to motors being sealed to high international standards, like IP56, (hose proof) or IP67 (submersible) to mitigate ingress.

Other protection methods have been adapted, like porous drain plugs being fitted to allow for the escape of water, or coatings being applied to protect the internal parts.

Due to the nature of such applications, it is an accepted industry requirement that the motor components are sealed, either with a compound or rubber O ring.

Such existing arrangements generally include an internal coating on the winding and all joins sealed, including the shaft, usually with oil seals.

Ingress does occur; however, one problem associated with such an existing arrangement is that the water build up inside the motor is often wrongly diagnosed as ingress when in fact it is more likely to be caused by condensation. This is supported by the number of motor failures in this type of application due to internal water damage, even if they are totally sealed.

Further experiments have shown that just changing the ambient temperature, without any external water making contact with the motor, will still cause condensation internally.

Summary of the Present Invention

There is provided an arrangement for reducing the possibility of condensation, said arrangement including:

To fill the internal cavities with a suitable material, like high temperature plastic, to significantly reduce the size of atmosphere inside the motor. A permanent, molded encapsulation of the stator magnets and filling of the internal cavities as much as possible is applied, wherein the proportional internal atmosphere has been reduced to insignificance.

Typically, the motor would operate under changing temperatures without the possibility of damaging internal condensation.

Typically, the motor no longer requires porous drain plugs.

Typically, the possibility of ingress is also reduced, because there is reduced internal expanding and contracting air cavities during temperature changes, so atmospheric pressures external and internal remain equal.

Typically, the arrangement is configured and adapted for use in applications where condensation is diagnosed as the concern.

Brief description of the art work;

This shows an example of an arrangement for correcting the possibility of water buildup inside electric motors, usually caused by condensation.

One indication shows the plastic injections filling cavities between the magnets.

Claims (1)

1. The claim defining the invention is as follows: An arrangement for extending the life of electric motors that are in applications where internal condensation is probable.