Automatically controlled washing machine
First Claim
1. In an automatically controlled washing machine including:
- a laundry drum;
a drive motor for driving the laundry drum with a plurality of different speeds for washing, rinsing and spinning;
an rpm control circuit for adjusting an rpm of the drive motor; and
means for determining the rpm of the drive motor in accordance with set-point and actual rpm values;
the improvement comprising;
a control circuit receiving a signal during a spin cycle, the signal being a measure for an undesired braking of the drum and being determined by a mutual ratio of the following operating parameters of the drive motor;
a) the set-point rpm,b) the actual rpm, andc) a load-dependent electrical variable;
and said control circuit controlling a spinning operation of the washing machine in dependence on the signal.
1 Assignment
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Accused Products
Abstract
An automatically controlled washing machine includes a laundry drum and a drive motor which drives the laundry drum at a plurality of different speeds for washing, rinsing and spinning. The speed of the drive motor is adjustable with an rpm control circuit and is determinable in accordance with set-point and actual rpm values. A control circuit of the washing machine can receive a signal during a spin cycle, which is a measure for an undesired braking of the drum (for instance from suds production) and is determined by a mutual ratio of the following operating parameters of the drive motor: the set-point rpm, the actual rpm, and a load-dependent electrical variable, such as a motor current.
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Citations
10 Claims
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1. In an automatically controlled washing machine including:
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a laundry drum; a drive motor for driving the laundry drum with a plurality of different speeds for washing, rinsing and spinning; an rpm control circuit for adjusting an rpm of the drive motor; and means for determining the rpm of the drive motor in accordance with set-point and actual rpm values;
the improvement comprising;a control circuit receiving a signal during a spin cycle, the signal being a measure for an undesired braking of the drum and being determined by a mutual ratio of the following operating parameters of the drive motor; a) the set-point rpm, b) the actual rpm, and c) a load-dependent electrical variable; and said control circuit controlling a spinning operation of the washing machine in dependence on the signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An automatically controlled washing machine, comprising:
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a laundry drum, and a drive motor driving the laundry drum with a plurality of different speeds for washing, rinsing and spinning; an rpm control circuit for adjusting a speed of the drive motor;
said control circuit receiving signals representing an actual speed of the laundry drum, and said control circuit being programmed to control the speed of the drive motor during a spin cycle in dependence on a signal formed from the following parameters;a) a set-point speed, b) an actual speed, and c) a load-dependent variable; wherein the signal is a ratio of the parameters and the signal is a measure for an undesired braking of the drum.
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Specification