WO2012140140A1

WO2012140140A1 - Device for monitoring an apparatus, which vibrates during operation, of a domestic appliance and domestic appliance for the care of laundry items

Info

Publication number: WO2012140140A1
Application number: PCT/EP2012/056678
Authority: WO
Inventors: Hasan Gökcer ALBAYRAK; Rudolf Seidl; Jörg SKRIPPEK; Dirk Aurich
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2011-04-15
Filing date: 2012-04-12
Publication date: 2012-10-18
Also published as: DE102011007515A1

Abstract

The invention relates to a device in a domestic appliance (1) having a vibration unit (2) that vibrates during operation, the vibration unit having a drive motor (5) and a drum (3) that can be driven by the drive motor (5). The device has a vibration monitoring unit, which comprises at least one acceleration sensor (6) for monitoring the vibration behavior of the vibration unit (2), wherein the at least one acceleration sensor (6) is arranged on the drive motor (5), and in particular is integrated in or on the drive motor (5). The vibration monitoring unit (6, 8, 15, 16) comprises a circuit board (8) designed as an adapter, the circuit board having a socket strip (9), which is matched to a connector pin strip (11) of the drive motor (5) in the number of sockets (10) of the socket strip and in the shape of the socket strip. The invention further relates to a domestic appliance for the care of laundry items.

Description

Device for monitoring an operating device of a domestic appliance, household appliance for the care of laundry items

[0001] The invention relates to a device for monitoring an operating device of a household appliance, which has a drive motor and comprises a drive unit driven by the drive motor, with a vibration monitoring unit, which at least one acceleration sensor for monitoring the vibration behavior of the vibrating device wherein the at least one acceleration sensor is arranged on the drive motor, in particular integrated in or on the drive motor. Furthermore, the invention relates to a household appliance for the care of laundry.

[0002] In domestic appliances for the care of laundry items, such as laundry dryers or washing machines, a drum for receiving items of laundry is driven by a drive motor. The drum rotates about its horizontal axis of rotation, and there are imbalances due to the load with laundry. Excessive imbalances lead to wear of the components.

[0003] It is an object of the present invention to provide a device and a household appliance for the care of items of laundry, with which or with which the occurrence of unwanted imbalances can be detected in a simple and time-saving manner and yet reliably at an early stage. Furthermore, an object of the invention is to provide a universal adapter assembly by which all drive motors, in particular universal motors, for washing machines of a production, which are equipped with the same motor connectors, can be retrofitted with acceleration sensors.

This object is achieved by a device having the features of claim 1 and a household appliance, which has the features of claim 12.

An inventive device for monitoring an oscillating in operation device of a household appliance comprises a drive motor and a by the drive motor drivable vibration unit of the device. In addition, the device comprises a vibration monitoring unit with at least one acceleration sensor for monitoring the vibration behavior of the vibrating device. Such a configuration can be ensured by means of relatively small and compact components, namely by means of at least one acceleration sensor, a reliable and safe, early detection of excessive unwanted vibration behavior of the vibrating device or at least a component thereof. In addition to a compact design can also be made possible a very reliable and cost-effective implementation. The vibration monitoring unit comprises a formed as an intermediate connector board, which has a socket strip, which is adapted in the number of its sockets and in shape of a connector pin header of the drive motor. If a household appliance is to be equipped with a function for reducing imbalances, this board can advantageously plugged as an adapter with the socket strip on the connector pin strip of the drive motor and the motor line coupled with socket strip to the terminal block of the intermediate connector.

Thus, the at least one acceleration sensor is arranged on the drive motor, in particular integrated in or on the drive motor. This is a particularly advantageous embodiment, since thereby the vibration behavior can be detected precisely. In addition, a very stable attachment is provided, which is designed to save space. Especially the integrated arrangement allows very precise information about the vibration behavior of the vibrating device, in particular of subcomponents thereof.

[0008] The device preferably comprises a control unit which is designed to evaluate the information of the at least one acceleration sensor and, depending thereon, to control the drive motor.

In particular, it is provided that at least two different speed profiles for a drive motor are stored in the control unit and the control unit is adapted to select a specific speed profile depending on the information of the acceleration sensor and to control the drive motor accordingly. In particular, the control unit is adapted to select a first speed profile in a first interval of acceleration values and a second speed profile in a second interval of acceleration values. As required, the operation of the drive motor and the oscillating unit coupled therewith can thus take place, in particular a drum of a domestic appliance for the care of laundry items, without unwanted imbalances and thus undesirable vibration behavior occurring.

Depending on the system accelerations or deflections due to the loading or the imbalance, the engine speed can thus be deselected or anticipated so that the limits of system stability with regard to undesired vibration behavior are not exceeded. In addition, it can be made possible that the loading of the oscillating unit, in particular the loading of a drum with items of laundry, is redistributed, so that the imbalance is reduced. The mechanical accelerations can be adjusted by the control of the control unit on the drive motor and on other components of the oscillating device so that no major system oscillations occur.

Thus, a forward-looking control concept with information of an acceleration sensor, which complies with a defined vibration state of the oscillating system or the oscillating device, can be made possible as a significant advantage. It can thus be avoided unwanted vibration states in the system. This is provided above all by an advantageous further development of the invention, in which the acceleration sensor has a speed evaluation device which calculates path signals from the speed behavior of the drive motor during the oscillation-dependent acceleration or deceleration values of the drive motor for the three possible deflection directions of the oscillation unit and feeds them to the control unit. In particular, the rotational speed values of the drive motor prevailing during the detection of the acceleration and deceleration values are evaluated, and the respective travel signal is determined from the rotational speed and the acceleration and deceleration values for the detected deflection direction. The speed values to be evaluated are preferably the speed values corresponding to the detected acceleration and deceleration values or a speed value that is to be detected during the detection of the acceleration and deceleration values. and delay values, in particular within a predetermined measurement interval, mean speed of the drive motor.

In particular, a tachogenerator is provided for detecting the rotational speed values, which is rotatably coupled to the shaft of the drive motor. A possible slip is thus excluded. For this purpose, it is particularly advantageous if, according to an advantageous embodiment of the invention, the acceleration sensor is arranged together with a tacho interface, a computing unit and a bus interface on a board which is provided with a socket strip for the connector pin header of the drive motor. In this way, namely, the board as a so-called intermediate plug together with each drive motor, in particular a universal motor, any washing machine whose drive motor has a standardized motor connector, with a function for monitoring imbalances and adjusting the control processes to an unevenly distributed in the laundry drum Laundry items to be upgraded. Another advantage is a board having a terminal block for the power supply of the drive motor. Thus, it is possible to deduct the plug for the power supply from the motor plug, instead plug on the board and plug the plug for the power supply to the terminal block of the board. Another advantage in the sense of a universality may be when the tachogenerator with the engine end shield of the drive motor forms a structural unit. Then, namely, according to a further development of the invention, a temperature sensor can be mounted in the drive motor, which is connected to the computing unit on the board. In this case, also designed as an intermediate connector board can be used. Thus, a standard tachogenerator unit of a drive motor, which is electrically contacted via a motor connector, are exchanged for the formed as an intermediate connector board. In such a case, the board preferably includes the acceleration sensor and a tachometer interface.

Furthermore, the invention relates to a household appliance for the care of items of laundry, which has a trained as a drum for receiving laundry items vibrating unit and beyond an inventive device or an advantageous embodiment thereof. The household appliance may be a washing machine, a tumble dryer or a washer-dryer.

Advantageous embodiments of the device according to the invention are equally regarded as advantageous embodiments of the domestic appliance according to the invention in a method for operating a household appliance with a drum for receiving laundry, the vibration behavior of an oscillating in operation apparatus of a household appliance, which is a drive motor and the has to be driven by the drive motor drum, monitored by means of the device according to the invention. The vibration behavior is detected at least with an acceleration sensor of the device.

Preferably, the acceleration sensor is integrated in the drive motor. In particular, information of the acceleration sensor is evaluated by a control unit, and depending on the drive motor is driven. In particular, at least two different speed profiles are stored in the control unit for the drive motor, and depending on the information of the acceleration sensor, a specific speed profile is selected and the drive motor driven according to this selected speed profile.

An embodiment of the invention will be explained in more detail with reference to a schematic drawing. In the drawing show

Fig. 1 is a simplified representation of a household appliance 1, which for

Care of laundry is designed and may be for example a washing machine, a washer-dryer or a tumble dryer,

2 shows a board as an intermediate connector according to an embodiment of the invention,

Fig. 3 shows the view of a circuit board as a fixed component of a fixedly connected to the drive motor speedometer accelerometer unit and a fixed to the drive motor speedometer accelerometer unit in cross section.

The domestic appliance, in the example shown, a washing machine 1, comprising a drum 3 rotatably connected to a vibrating unit 2, which is rotatable about an axis A perpendicular to the plane extending axis. In the drum 3, a laundry item 4 is introduced. In addition, the household appliance 1 comprises a drive motor 5, which is provided for driving the drum 3 in a manner not shown. In the drive motor 5, at least one acceleration sensor 6 is integrated, which is associated with a vibration monitoring unit shown in Fig. 2 and 4, respectively. In addition, the household appliance 1 comprises an electronic control unit 7, which is designed to control the motor 5. In addition, the control unit 7 is designed to evaluate the information detected by the sensor 6. At least the drum 3 and the drive motor 5 belong to a vibrating device (oscillation unit 2), which is movable relative to the housing of the household appliance 1, shown schematically as a frame.

In the control unit 7 at least two different speed profiles for the drive motor 5 are stored. The acceleration sensor 6 detects acceleration values in all three deflection directions X, Y and Z of the oscillating system 2. Depending on the acceleration values detected during operation of the household appliance 1 by the acceleration sensor 6, which are obtained when the drum 3 rotates, a suitable speed profile is generated by the control unit 7 selected and the drive motor 5 further controlled and operated on the basis of this selected speed profile. The formed in Fig. 2 as an intermediate connector board 8 has a socket strip 9, which is adapted in the number of its sockets 10 and in their shape of the connector pin strip 11 of the drive motor 5. If a household appliance 1 is to be equipped with a function for reducing imbalances, this board is plugged as an adapter 8 with the socket strip 9 on the connector pin strip 11 of the drive motor 5 and the motor line with socket strip 12 to the terminal block 13 of the intermediate connector 8 coupled (bow arrow 14th ). On the board 8, which includes a printed circuit, not shown, the acceleration sensor 6, a tachometer interface 15, a computing unit (CPU) and a bus interface 16 are also arranged. The bus interface 16 establishes the connection via the line 17 to the electronic control unit 7, via which the power control for the drive motor 5 (not shown) is controlled.

In this way, therefore, a domestic appliance 1 with an arbitrary universal drive motor 5, which is equipped with a standardized connector pin strip 11, can be replaced by a printed circuit board 8 adapted to the characteristics of the associated household appliance 1 in the form of an intermediate plug between the plug pin strip 1 1 and the motor plug 12 are equipped with an imbalance reduction function.

Another form of equipment with such Unwuchtverminderungs- function is the formation of a drive motor 5 with an integrated tachogenerator with function board 18 for the integration of the components acceleration sensor 6, speedometer interface 15, CPU CPU and bus interface 16 as shown in FIG. 3 and 4. The drive motor 5 has a rear bearing plate 19, in which the rear ball bearing 20 of the shaft 21 of the motor rotor (not shown) is mounted. On the outside of the bearing plate 19, a flange 22 is attached, which serves as a housing for the tachometer generator 23. The tachogenerator 23 has a fixed to the rotor shaft 21 axis tachometer 24 of the motor 5 magnetic ring 25 as a rotor with which it magnetically excited during its rotation iron teeth 26, which in turn generate rotationally synchronized pulses to the coils 27.

The coils 27 are galvanically connected to the tachometer interface 15 on the board 18; their impulses are calculated into speed values. To the circuit board 18 is further connected via a led into the stator of the motor 5 line 28 for a tempera ture sensor 29 which emits a signal corresponding to the temperature of the stator to a temperature interface 30 on the circuit board 18. The temperature interface 30 makes this signal available as a correction of the arithmetic unit CPU.

The board 18 (FIG. 3) has a tab 31 at the top and bottom with plug-in tracks 32, which serve for connecting the power supply for the motor 5 and for signal transmission to the electronic control unit 7. To protect the components 6, 15, 16, 30 and CPU, the board 18 is still covered with a protective shield 33 which is secured by means of spacers 34 on the board.

List of reference domestic appliance

vibrating unit

drum

laundry batch

drive motor

Acceleration sensor electronic control unit board or intermediate plug socket connector

sockets

Pin bar

Socket assembly

terminal block

Bow arrow

Tacho interface

Bus interface

Line 17

circuit board

end shield

ball-bearing

rotor shaft

flange

tachogenerator

speedometer

magnetic ring

iron teeth

Do the washing up

management

temperature sensor

Temperature Interface LIST OF REFERENCE NUMBERS

31 lobes

32 panels

33 protective shield

34 spacers

A drum axis

CPU processing unit

Claims

claims

Device having an oscillating device in operation of a household appliance (1), which has a drive motor (5) and comprises a drive unit (5) drivable vibration unit (2), with a vibration monitoring unit (6, 8, 15, 16), which comprises at least one acceleration sensor (6) for monitoring the vibration behavior of the oscillating device (2, 5), wherein the at least one acceleration sensor (6) is arranged on the drive motor (5), in particular integrated in or on the drive motor (5) in that the vibration monitoring unit (6, 8, 15, 16) comprises a printed circuit board (8, 18) designed as an intermediate plug, which has a socket strip (9) which, in terms of the number of its sockets (10) and in the form of a plug pin strip (1 1) of the drive motor (5) is adjusted.

Device according to claim 1, characterized in that the board (8, 18) has a terminal block (13) for the power supply of the drive motor (5).

Device according to claim 1 or 2, characterized in that the device has a control unit (7), which is designed for evaluating the information of the at least one acceleration sensor (6) and is designed to control the drive motor (5).

Device according to claim 3, characterized in that in the control unit (7) at least two different speed profiles for the drive motor (5) are stored, and the control unit (7) is adapted to a specific depending on the information of the acceleration sensor (6) Select speed profile and the drive motor (5) to control accordingly.

Device according to claim 4, characterized in that the control unit (7) is adapted to select a first speed profile in a first interval of acceleration values and a second speed profile in a second interval of acceleration values.

6. Device according to one of the preceding claims, characterized in that the acceleration sensor (6) has a Drehzahlauswerteeinrichtung, from the speed behavior of the drive motor (5) during the vibration-induced acceleration or deceleration values of the drive motor (5) for the three possible deflection directions ( X, Y, Z) of the oscillating unit (2) calculated path signals and the control unit (7) supplies.

7. Device according to claim 6, characterized in that for detecting the rotational speed values, a tachogenerator (23) is provided, which is rotatably coupled to the shaft (21) of the drive motor (5).

8. Device according to claim 6 or 7, characterized in that the acceleration sensor (6) together with a tachometer interface (15), a computing unit (CPU) and a bus interface (16) on a circuit board (8, 18) is, which is provided with a socket strip (9) for the connector pin strip (11) of the drive motor (5).

9. Device according to claims 7 or 8, characterized in that the tachogenerator (23) or the tacho-interface (15) with the bearing plate (19) of the drive motor (5) forms a structural unit.

10. Device according to one of claims 7 to 9, characterized in that the tachogenerator (23) has an arrangement of magnetically excited coils (27) whose wire ends are soldered directly to the circuit board (18).

1 1. Device according to one of claims 6 to 10, characterized in that in the drive motor (5), a temperature sensor (29) is mounted, which is connected to the computing unit (CPU) on the board (18).

12. Domestic appliance for the care of laundry items, comprising a drum (3) for receiving laundry items (3) containing the vibrating unit (2), and a device according to one of the preceding claims.