DE4341832C2 - Washing machine - Google Patents

Description

The invention relates to an automatic washing machine with the features the preamble of claim 1.

A washing machine with these features is known from DE 39 27 426 A1. This washing machine is a drive motor brushless DC motor used, which over a Bearing cross is attached to the outside of the washing drum container. A Printed circuit board with the entire engine control electronics between the stator laminated core and the bearing cross and is attached to the bearing bush.

Modern luxury washing machines require both in Different speeds in the wash cycle and in the spin cycle the washing drum. The spin speeds of Have 1300 to 2000 l / min while for the noise level at most for washing LWA 47 dB and for spinning LWA 49 dB should be aimed for.

Automatic washing machines with a DC motor are disadvantageous with regard to the high brush wear, in terms of the strong Noise development at high speeds and in terms of difficulties associated with radio interference suppression.

The invention has for its object a washing machine, to create especially for the upper class with which everyone desired speeds of 25 to 2000 l / min for the Spin cycle and  the different wash cycles with the lowest possible Have the noise level generated. For a large extent uniform washing and spinning effect should Speeds are achieved as constant as possible.

This task is solved by a washing machine with the features specified in claim 1.  

Since the washing drum with a multi-pole motor (claim 3) is driven directly, the requirement of Speed limitation at which the maximum engine speed with the Desired high spin speed is identical become. The desired low noise level is thereby achieved that the drive motor from an insulation hood is encapsulated. In addition, the back wall can also be used of the tub can be provided with noise insulation (Claim 2). Since the drive motor has no brushes and advantageously as a synchronous motor with a converter is formed, the encapsulation of the motor from thermal Reasons to be made without hesitation. This will still be this favors because the electronics are not arranged on the motor is (claim 5).

Further advantageous refinements of the subject matter of the invention can be found in the further subclaims.

The invention is illustrated in the figure Embodiment described in more detail.

A washing machine 1 has a housing 3 in which a mechanically oscillating unit 5 is arranged, which is a surrounding vat 9 and a wash drum 7 directly driving the drive motor of a horizontally located wash drum. 7 The other parts necessary to control the washing machine 1 are not shown in detail.

The drive motor is arranged as a brushless motor on the outside 22 of the tub rear wall 15 and surrounded by an insulation hood 13 , through which the motor noise is effectively shielded. Here, the insulation hood 13 is firmly connected to the rear wall 15 of the tub 9 . Since the control electronics 16 not on the drive motor, but at a remote location in the housing 3 , z. B. is arranged in the region of the front wall 18 , the encapsulation of the drive motor can be made without hesitation, especially since the drive motor also has no brushes.

Reaching the desired noise level can also be supported by providing the inside 17 of the tub rear wall 15 with an insulation layer 19 . The drive motor is an external rotor motor, the permanent magnet rotor designed as external rotor 23 drives the drive shaft 24 of the laundry drum 4 directly. The drive shaft 24 is in this case rotatably supported on one side in a bearing consisting of two roller bearings 26 , 27 in an outwardly projecting hub 28 on the tub rear wall 15 . The stator 29 with the stator laminated core 30 is arranged annularly to the hub 28 .

The multi-pole design of the drive motor with a number of poles <10 means that the requirement for speed limitation, at which the maximum motor speed is identical to the spin speed, can be effectively met. The drive motor can either be a synchronous motor with a converter or a reluctance motor. The insulating hood 13 surrounding the drive motor consists of a hollow cylinder 21 , closed on one side by a base 20 , which closely surrounds the outer rotor 23 and whose opening edge 25 is firmly connected to the tub rear wall 15 .

The washing machine 1 according to the invention can be operated with engine operating speeds from 25 to 2000 l / min, the desired noise level being achieved simply and effectively by the noise encapsulation of the drive motor.

Claims (5)

1. washing machine with a housing in which a mechanically vibrating unit is arranged, the
a horizontal laundry drum,
a vat surrounding it and
comprises a brushless external rotor motor which is mounted on the outside of the tub rear wall and whose permanent magnetic rotor, which is designed as an external rotor, drives the drive shaft of the laundry drum directly,
characterized in that
the external rotor motor is a synchronous motor with converter and is surrounded by an insulation hood ( 13 ) which is fastened to the rear wall of the tub ( 15 ) and which consists of a hollow cylinder ( 21 ) closed on one side by a base ( 20 ) which defines the external rotor ( 23 ) closely surrounds and the opening edge ( 25 ) is firmly connected to the tub rear wall ( 15 ). 2. Washing machine according to claim 1, characterized in that the tub rear wall ( 15 ) on its inside ( 17 ) is provided with an insulating layer ( 19 ). 3. Washing machine according to claim 1 or 2, characterized featured, that the external rotor motor is multi-pole and has a number of poles <10.   4. Washing machine according to claim 3, characterized in that the external rotor motor is a reluctance motor. 5. Washing machine according to one of claims 1 to 4, characterized in that control electronics ( 16 ) of the synchronous motor are arranged outside the insulating hood ( 13 ).