Motor protection scheme for wireless vacuum cleaners

The wireless vacuum cleaner is a new type of vacuum cleaner that does not require a power cord. It has a rechargeable battery. Like a mobile phone, it keeps the machine running through a charger. Generally, it only needs to be charged for several hours to complete the charging, and it can work for several decades. Wireless vacuum cleaners are not constrained by power cords, whether they are clean floors, door and window gaps or cars.

When using a wireless vacuum cleaner to clean the ground, due to the unpredictability of the ground items, the motor of the vacuum cleaner is often blocked by foreign matter such as hair and cords. Motor stalling means that the foreign object fixes the motor bearing so that it cannot rotate. At this time, the voltage is applied to both ends of the motor, so that the current becomes the stall current. Generally, the motor is not allowed to stall during the design, because the temperature of the motor coil rises sharply after the stalling. After the maximum temperature of the coil is exceeded, the motor will burn out after a long time, which increases the inconvenience of the consumer and increases The maintenance cost of the producer, so it is indispensable to add a motor protection device to the wireless robot, and it is a protection scheme that can automatically recover after the stall is eliminated. For these reasons, TE ConnecTIvity's recoverable resistor PolySwitch is a more complete solution.

TE ConnecTIvity is the world's largest professional provider of passive components and the world's largest supplier of circuit protection devices. It is the inventor of PPTC polymer material temperature coefficient resistors, and its overcurrent and overvoltage protection devices are widely used in consumer applications. Electronics, IT, communications, industry, automotive and many other fields. In terms of overcurrent protection, we offer PolySwitch self-resetting components and a wide range of PPTC models to choose from. The Radial-leaded devices series of resettable circuit protection devices are designed to prevent motorization in commercial and household appliances. Damage caused by overload, overheating, stalling and other potential factors, including a variety of rated voltage grade products, these products have low impedance, fast action time, small size and resettable function, which helps circuit designers to introduce safety and Reliable products and reduced repair costs during the warranty period.

Unlike single-use fuses, PPTC devices do not need to be replaced after a fault. After the overcurrent condition is removed and the power is turned off, the circuit will return to normal operating conditions. This product offers greater flexibility, longer life and lower electromagnetic interference (EMI) than bimetal circuit breakers.

The following is a general procedure for selecting a PPTC in a wireless vacuum cleaner.

First, confirm the upper limit of the resistance of the PPTC, R1max. Figure 1 below shows the calculation process of the upper limit of the PPTC resistance R1max.

Figure 1: Calculation process of PPTC resistance upper limit R1max

The second is to confirm the lower limit of the PPTC resistance Rmin. Figure 2 below shows the calculation process of the lower limit of the PPTC resistance Rmin.

Figure 2: Calculation flow of the lower limit of resistance of PPTC

Finally, confirm the physical parameters of the PPTC, such as the package size of the PPTC, etc., and select the model of the PPTC.

For more detailed wireless vacuum cleaner protection solutions, you can visit TE's portal or contact TE Circuit Protection for technical support. .

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