| 摘要 |
In an inventive spin extractor, a speed controller applies a constant voltage to a motor for starting a rotation of a drum. Since the torque on the drum is constant, the drum rotates at a low speed when the laundry is in the form of a large mass and the load on the drum is accordingly large. Every time part or all of the laundry falls beyond the baffles provided on the inner peripheral wall of the drum, the laundry is loosened and scattered, so that the load on the drum decreases. When the laundry is scattered adequately, the torque by the motor overcomes the load of the laundry, and the drum speed rapidly rises. When the speed exceeds the equilibrium speed where the centrifugal force acting on the laundry is equal to gravity, the scattered laundry starts rotating in the state of being pressed on the inner peripheral wall of the drum. When the drum speed reaches a preset speed higher than the equilibrium speed, the speed controller changes the speed control method to a phase control method for maintaining the drum speed at an object speed. While the drum is rotating at the object speed, the eccentric load detector detects the magnitude of the eccentric load based on the periodical change in the motor current, and a central controller determines whether the laundry is distributed evenly on the inner peripheral wall of the drum.
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