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This post was last edited by liuquan1100 on 2018-5-24 at 17:26. Automatic washing equipment has a significant difference in rotation speed during cleaning and dehydration; generally, variable-pole motors or several standard motors are used, with clutches to switch between modes of operation. Due to the high inertia of the load, a high-speed differential motor is required to obtain a large starting torque, and a braking device is needed during deceleration. If variable frequency drive control is used, a single motor can be used to adjust the speed over a wide range from low to high, while the size of the transmission mechanism is reduced and the control performance is improved. With inverter control, the rotation speed of the washing tub during the washing, rinsing, and spinning stages can be adjusted as needed, depending on factors such as the type of fabric and detergent; increasing the rotation speed during spinning helps to reduce the cycle time ； Due to the use of electrical braking, it is possible to reach a stop state from high-speed dehydration in a relatively short time. Several motors are prepared based on the rotational speeds required for cleaning, dehydration, etc., of the washing equipment, and clutches are used to switch between these motors. The dehydration process is carried out by two motors, one for high-speed dehydration and another for medium-speed dehydration, or a variable-pole motor may be used; as a result, the transmission mechanism is complex and requires components such as clutches, pulleys, and brake valves. Using an inverter can effectively solve the above problems. A single electric motor is sufficient for high-speed, medium-speed, and low-speed operation, as well as braking, resulting in a simple transmission system. After dehydration is complete, the frequency converter can use an external braking device to reduce speed, converting the motor’s regenerative energy into heat energy, thereby achieving rapid deceleration. One operating cycle of the elution unit in fully automatic washing equipment is: rinsing – dehydration – cleaning – dehydration – drying. Among them, the washing and rinsing processes consist of frequent forward and reverse rotations, while dehydration involves high-speed rotation, and drying involves long periods of low-speed operation. Before dehydration, the fabric also needs to be evenly distributed around the drum, which is the balancing process. With variable frequency drives used for speed control, the fully automatic elutriator requires only one motor connected to the washing tank, which simplifies the mechanical components; standard motors can be used ； Using ultra-fast dehydration can effectively reduce the dehydration time ； The washing and dewatering speeds can be set arbitrarily via the control panel, improving operational performance ； Since components such as brake shoes and clutches, which suffer from heavy wear, have been removed, the maintenance workload for the system is low. When designing and applying washing equipment, the following points should be taken into account: ① When using standard motors for ultra-high-speed dehydration, it is possible that insufficient motor torque may lead to stalling; therefore, the mechanical characteristics of the motors must be given full consideration ； ②When the motor operates at high speeds, vibration increases, and it is possible to resonate with the washing tub; therefore, the resonance point should be avoided.