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Compressor starts PTC thermistor, starts PTC
When starting, the motor must overcome its own inertia and the reaction force of the load (for example, the refrigerator compressor must overcome the reaction force of the refrigerant when starting). Therefore, the motor requires large current and torque when starting. When the rotation is normal, in order to save energy, the required torque will be significantly reduced. Add a set of auxiliary coils to the motor, which only works when starting, and disconnects when normal. Connect the PTC thermistor in series to the starting auxiliary coil. After starting, the PTC thermistor enters a high resistance state and cuts off the auxiliary coil, which can achieve this effect. This product has the characteristics of no contact, low noise, high reliability, and long life. , different characteristics and structures are used to ensure different machine design requirements.
- Commodity name： Compressor starts PTC thermistor, starts PTC
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- 产品规格及参数
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Compressor starts PTC thermistor, introduction to starting PTC:
Delay start type PTC thermistor
Application principles
When the motor is started, it must overcome its own inertia and the reaction force of the load (for example, the refrigerator compressor must overcome the reaction force of the refrigerant when starting), so the motor requires large current and torque when starting. When the rotation is normal, in order to save energy, the required torque will be significantly reduced. Add a set of auxiliary coils to the motor, which only works when starting, and disconnects when normal. Connect the PTC thermistor in series to the starting auxiliary coil. After starting, the PTC thermistor enters a high resistance state and cuts off the auxiliary coil, which can achieve this effect. This product has the characteristics of no contact, low noise, high reliability, and long life. , different characteristics and structures are used to ensure different machine design requirements.
1. PTC thermistor for starting the compressor of the refrigerator
The compressor of the refrigerator is driven by a single phase induction motor. When the motor starts, it must overcome both its own inertia and the reaction force of the load-high-pressure refrigerant. It needs to ensure a large starting current. For this reason, a starting circuit with a PTC thermistor is usually used (schematic diagram See Figure 1).
2 PTC thermistor for starting variable frequency air conditioner
When starting a fixed-frequency air conditioner, because the compressor has a large rotational torque, when the current is not large enough, the compressor is prone to stalling and is difficult to start. For this reason, a starting coil is added and connected in series with a starting function. PTC thermistor, when the compressor starts, the circuit first provides a large matching starting current through the starting circuit, which overcomes the rotational torque and allows the compressor to rotate normally. At this time, the starting circuit where the PTC thermistor is located increases stepwise due to the resistance value of the PTC thermistor, which is similar to "cutting off" the power supply, and the normal operating current will run normally through the operating coil circuit. At this time, the PTC thermistor always bears a voltage that cannot be eliminated until the power is turned off. See below.
3. PTC thermistor for starting variable frequency air conditioner
When the inverter air conditioner starts, the voltage is added to the rectifier and filter circuit through the PTC component, charging the capacitor smoothly to the set value. The power module IPM starts to work, inverting the input DC voltage into three AC currents and adding them to the three-phase AC motor windings. , so that the motor can operate normally. At the same time, after the capacitor is charged to the set value, the DC voltage is output through the IPM to the relay pull-in switch K, and the PTC element is terminated and the work is suspended (see Figure 2).
The purpose of connecting PTC components in series in the main circuit is to prevent the rectifier and filter circuit from directly bearing the impact of large current during the initial power-on period, causing damage to the energy storage components. That is, the PTC component plays a buffering and protective role in the early stage of power-on. In addition, if the relay fails (cannot close normally), the PTC element will become a high resistance state after being energized, which can protect the circuit.
4 test circuit:
Key words:
Compressor starts PTC thermistor, starts PTC
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