DE10060634A1 - Casing loaded drum washing machine has at least one winding leg of the motor that is permanently stimulated so that the drum stops in the loading or unloading position - Google Patents

Abstract

The washing machine has a washing drum that is directly driven by an electric motor, whereby the angular position of the motor's rotor coincides with the angular position of the drum and at least one winding leg (8) of the motor is permanently stimulated so that the drum stops in the loading or unloading position.

Description

The invention relates to a drum-type washing machine which can be loaded with a jacket Washing drum in the laundry removal or Loading position.

Drum washing machines with a horizontal position of the drum axis are in the essentially differentiated into two types.

In Fig. 1 is a loadable drum-type washing machine 1 is shown in the Wäscheentnahme- or loading position. Coat-loading drum washing machines 1 are loaded and emptied via a closable opening 4 in the casing of the washing drum 3 . This design is also known as a top loader. In contrast to this, front loaders are loaded and emptied laterally, ie axially to the drum axis 5 , in the same drum position in the washing machine.

There is an insufficiently solved problem to position the laundry drum 3 with the closable opening 4 in the jacket so that the laundry can be removed from above through the opening 4 in the jacket of the laundry drum 3 after completion or when the program sequence is interrupted. If this problem is not solved, the operator of the washing machine has the washing drum 3 after opening the cover 2, the drum washing machine 1 by hand into the removal position rotate when the washing drum 3 does not remain even at this parking position by chance. The washing drum 3 is rotated by hand against the resistance of the motor and the center of gravity which is established after the washing drum has come to a standstill.

This problem is solved in various ways in the prior art.  

One way to park the drum with the removal position in Bringing agreement is through an electromechanical driven mechanical lock the drum in the removal position fix.

This solution is complex in terms of equipment and mechanically very susceptible to what is the lifespan and susceptibility to repairs have a negative impact.

Another option is to position the drum according to DE 40 37 868 to perform.

A tachometer, a position indicator and a Evaluation unit ensures that the parking position of the drum in the Removal position is reached, with a certain angular deviation in the Result is tolerated. The removal position is reached via a Position detector consisting of a proximity switch, a magnet and a Hall circuit exists, monitored. However, under unfavorable Conditions the residual unbalance with an unfavorable drum center of gravity lead to a failure of the parking function and the Removal position is not reached. This is the case, for example, if the laundry does not come out of the laundry ring formed during the spin cycle peel off.

The solution described above is not mechanically susceptible to failure, however, there is still a considerable outlay in terms of apparatus for the Ensure the removal position of the drum after it has stopped.

The object of the invention is in the case of drum washing machines which can be fed with a jacket as the parking position of the laundry drum, the removal position of the drum to ensure user-friendly use of this To ensure washing machine type. The operator should stand still after the  Drum through the housing opening through the opening in the drum jacket can reach directly without having to turn the laundry drum significantly have to.

This object is achieved in that the laundry drum the drum washing machine is driven by an electric motor with direct drive is, the angular position of the motor rotor with the angular position of the Laundry drum matches and that at least one winding strand of the Electric motor is so continuously excited that the laundry drum when stopped the laundry removal or loading position remains.

The principle-based, unambiguous assignment between motor rotor and laundry drum position used in direct drive to target Set the desired angular positions of the laundry drum. The The solution according to the invention comes without further expenditure on equipment, such as special proximity switches for the detection of the parking position or mechanical or electromechanical locks or brakes.

As a result of the solution according to the invention, the laundry drum in the predetermined laundry removal or loading position. This Parking function using the possibilities of direct drive is reliable and fast. In contrast to that from DE 40 37 868 known solution, the laundry removal or loading position without additional reversing cycles for loosening or the like can be started. Overall, the functional reliability is increased and the Program execution time reduced.

Further details, features and advantages of the invention result from the following description of an embodiment with reference to the associated drawing. It shows:  

Fig. 2: Basic circuit diagram of the drive system with a three-strand electronically commutated DC motor

In FIG. 2, the basic circuit diagram of the drive system is shown with a three-phase electronically commutated DC motor. The essential components are the rectifier 6 , which converts the alternating current present in the household into direct current, the power stage 7 , which ultimately ensures the reversal of the current flow as an electronic switch, the winding strands 8 , which form the stator windings 9 , and the permanent magnet rotor 10 , which is connected to the drum axis 5 of the laundry drum 3 .

For the electronic commutation of the direct current motor, means for the rotor position / speed detection 11 are required, which pass on the rotor position to the microprocessor 12 for controlling the power stage 7 .

The permanent magnet rotor 10 is preferably designed as an external rotor, which leads to a space-saving design of the motor and thus also of the drum-washing machine 1 that can be loaded with the jacket as a whole.

In the drive system shown, the alternating current in the rectifier 6 is converted into direct current. In the power stage 7 , it is switched to the three winding phases 8 in a commutating manner such that the pointer of the stator flux and the pointer of the rotor flux enclose the angle of 90 ° on average. In order to ensure this, the rotor position must be detected by means of the rotor position / speed detection 11 . With the information obtained from this, the winding currents are switched to the winding strands 8 by means of the microprocessor 12 and the power stage 7 .

If a winding phase 8 is now continuously excited after completion or when the washing program sequence is interrupted, this brakes the permanent magnet rotor 10 and thus the laundry drum 3 , so that it comes to a standstill. According to the invention, it is precisely the winding strand 8 which is permanently excited, in which after the laundry drum 3 has come to a standstill, it is in the laundry removal or loading position.

Hall sensors, optoelectronic sensors or magnetoresistive sensors, for example, are to be provided as means for the rotor position / speed detection 11 .

LIST OF REFERENCE NUMBERS

1

drum washing machine

2

cover

3

washing drum

4

lockable opening

5

drum axis

6

rectifier

7

power stage

8th

windings

9

stator winding

10

Permanent magnet rotor

11

Means for rotor position / speed detection

12

microprocessor

Claims (6)

1. coat-fed drum washing machine, characterized in that the washing drum ( 3 ) of the drum washing machine ( 1 ) is driven by an electric motor in direct drive, the angular position of the motor rotor coinciding with the angular position of the washing drum ( 3 ) and that at least one winding strand ( 8 ) of the The electric motor is continuously excited so that the laundry drum ( 3 ) remains in the laundry removal or loading position when it is at a standstill. 2. Drum washing machine according to claim 1, characterized in that the electric motor for the direct drive of the drum washing machine ( 1 ) is an electronically commutated DC motor with a permanent magnet rotor ( 10 ). 3. Drum washing machine according to claim 2, characterized in that the electronically commutated DC motor with permanent magnet rotor ( 10 ) has three winding strands ( 8 ). 4. drum washing machine according to one of claims 1 to 3, characterized characterized that the electric motor for direct drive as External rotor motor is formed. 5. drum washing machine according to one of claims 1 to 4, characterized in that the drive system of the drum washing machine ( 1 ) a rectifier ( 6 ), a power stage ( 7 ), the electric motor with winding strands ( 8 ), stator windings ( 9 ) and permanent magnet rotor ( 10 ) and means for rotor position / speed detection ( 11 ) and a microprocessor ( 12 ). 6. Drum washing machine according to claim 5, characterized in that Hall sensors, optoelectronic sensors or magnetoresistive sensors are used as means for rotor position / speed detection ( 11 ).