TH42342B - Cylinder type washing machine - Google Patents

Abstract

The DC60 cylindrical drum washing machine consists of a cylindrical drum and an electric motor to rotate the drum primarily around a horizontal axis. The motor has a rotor with permanent magnets. The current flowing into the motor is divided into a d-axis component parallel to the magnetic flux generated by the permanent magnets and a q-axis component perpendicular to the d-axis component. The rotational speed of the drum is controlled by a vector control system, which controls each current component separately to match different constraints. To achieve equilibrium with the laundry clinging to the inner surface of the drum, the drum's rotational speed must be rapidly increased to a speed at which the laundry adheres tightly to the inner surface. Afterward, the speed is gradually reduced. The drum's rotational speed is then increased again to initiate the centrifugal washing process, immediately following the deceleration phase. The rotation of the washing drum ensures that the laundry is in a state of equilibrium. Whether the laundry is in equilibrium is determined by the width of the variation in the electrical current along the q-axis. A cylindrical washing machine consists of a cylindrical drum and an electric motor that rotates the drum primarily around a horizontal axis. This motor has a rotor with permanent magnets. The electrical current flowing into the motor is divided into a component of the current along the d-axis, parallel to the magnetic flux generated by the permanent magnets, and a component of the current along the q-axis, perpendicular to the component along the d-axis. The rotational speed of the cylindrical drum is controlled by a vector control system, which controls each current component separately to match different constraints. To achieve equilibrium with the laundry adhering to the inner perimeter of the drum, the rotational speed of the drum must be immediately increased before the centrifugal force begins. The speed is then gradually reduced to maintain the desired speed. As the rotation gradually decreases, the rotational speed of the cylindrical drum is increased to the next step, which is the work of shaking out the water through centrifugal force. The immediate consequence of this centrifugal force, encountered during the deceleration phase, is that the laundry is in equilibrium within the cylindrical drum. Whether the laundry is in equilibrium is determined by the width of the variation in the electrical current along the q-axis.

Claims (10)

1. How to control a drum washing machine consisting of a brushless DC motor (14) and a drum (7) that is primarily rotated around a horizontal axis. The brushless DC motor (14) is equipped with a rotor provided with permanent magnets to drive the rotation of the drum (7). The method is as follows: The speed of rotation of the brushless DC motor is controlled in such a way that the speed of rotation of the drum (7) is first increased to a speed at which the laundry adheres sufficiently to the inner perimeter of the drum before the centrifugal wringing begins. Then the speed of rotation of the brushless DC motor is controlled in such a way that the speed of rotation of the drum (7) is gradually decreased, and if it is set during the decrease in the speed of rotation of the drum (7) at which the laundry is balanced in the drum (7), the speed of rotation of the drum (7) is abruptly increased to the centrifugal wringing speed at which the speed of rotation of the brushless DC motor is controlled. A brushless DC motor (14) is operated by a vector control system in which the current flowing into the brushless DC motor (14) is split into a component that is the axial current of magnetic flux (Id) parallel to the magnetic flux created by the permanent magnets and a component that is the axial current of torque (Iq) intersecting the component that is the axial current of magnetic flux (Id), and where the axial current of magnetic flux (Id) and the axial current of torque (Iq) components are individually controlled to match each force value so that the variation of the rotor speed relative to each force value is minimized. 2. A cylindrical washing machine consists of: - a cylindrical drum and - an electric motor that rotates the drum mostly around a horizontal axis. The motor is controlled to minimize speed variations during one revolution of the drum. The rotational speed of the drum increases abruptly until the clothes to be washed are firmly attached to the inner surface of the drum before the centrifugal spinning process begins. The rotational speed is then increased again to continue the centrifugal spinning process immediately when the clothes are found to be in equilibrium within the drum. As the rotational speed is gradually increased, the rotational speed is gradually decreased when the clothes are no longer in equilibrium within the drum. The rotation of the drum then stops abruptly, and after that, the rotational speed... The load in the cylindrical drum will gradually increase again when the laundry is no longer in a balanced state within the drum, even after the drum's rotation speed has been reduced to a sufficient level. 3. A cylindrical drum washing machine, as per claim 1, where the motor is a brushless DC motor with a rotor containing permanent magnets. The current flowing into the motor is divided into a current component along the d-axis parallel to the magnetic flux generated by the permanent magnets and a current component along the q-axis perpendicular to the current component along the d-axis. The rotational speed of the cylindrical drum is controlled by a vector control unit which controls each current component separately to meet different constraint values. 4. A cylindrical drum washing machine, as per claim 2, where the motor consists of a brushless DC motor with a rotor containing permanent magnets. The current flowing into the motor is divided into a current component along the d-axis parallel to the magnetic flux generated by the permanent magnets and a current component along the q-axis perpendicular to the current component along the d-axis. The rotational speed of the cylindrical drum is controlled by a vector control unit which controls each current component separately to meet different constraint values. 5. A cylindrical drum washing machine, as per claim 1, where the motor consists of a brushless DC motor with a rotor containing permanent magnets. The current flowing into the motor is divided into a current component along the d-axis, approximated by the operation at which the approximate value of the d-axis current component of the induced voltage due to the rotation of the permanent magnets is zero, and a current component along the q-axis, perpendicular to the d-axis current component, and the rotational speed of the cylindrical drum is controlled by a sensorless vector control which controls each current component separately to satisfy each constraint value. 6. A cylindrical drum washing machine, according to claim 2, where the motor consists of a brushless DC motor with a rotor containing permanent magnets. The current flowing into the motor is divided into a current component along the d-axis, approximated by the operation at which the approximate value of the d-axis current component of the induced voltage due to the rotation of the permanent magnets is zero, and a current component along the q-axis, perpendicular to the aforementioned d-axis current component, and the rotational speed of the cylindrical drum is controlled by a sensorless vector control which controls each current component separately to satisfy each constraint value. 7. A cylindrical drum washing machine, according to claim 3, where when the width of the variation of the electrical current component along the q-axis is reduced to or below a predetermined value, the clothes being washed are found to be in equilibrium in the cylindrical drum. 8. A cylindrical drum washing machine, according to claim 4, where when the width of the variation of the current component along the q-axis is reduced to or below a predetermined value, the clothes being washed are found to be in equilibrium in the cylindrical drum. 9. A cylindrical drum washing machine, according to claim 5, where when the width of the axial variation q of the current flowing into the motor is reduced to or below a predetermined value, the clothes are found to be in equilibrium in the drum. 10. A cylindrical drum washing machine, according to claim 6, where when the width of the axial variation q of the current flowing into the motor is reduced to or below a predetermined value, the clothes being washed are found to be in equilibrium in the cylindrical drum.