At present, modern elevators mainly adopt the following six energy-saving technologies:Energy feedback technology Energy feedback technology can convert the regenerative energy generated by the car during light load up or full load down, as well as the kinetic energy generated by motor braking, into electrical energy through multiple rectification technology and feed it back to the power grid for use by other electrical equipment in the same local area network. This can not only reduce equipment energy consumption but also comply with green environmental protection. According to this principle, an experimental type of "hybrid electric elevator" has been developed, which can store the feedback power in a specially designed "battery" for use by other electrical equipment in the power supply network.

Small and medium-sized power general inverters are generally voltage type inverters, which use AC-DC and AC-DC working modes. When the frequency converter is first powered on, due to the large capacity of the DC side pump capacitor, the current between the waist and the charging point is equivalent to a short circuit, resulting in a large current. If no charging resistance is added between the rectifier bridge and the electrolytic capacitor, it is equivalent to a direct short circuit to ground of a 380V power supply, and the instantaneous rectifier bridge will explode through an infinite current. After limiting the current of the charging battery, if there are no relays or other components, the power consumption of the charging battery is also high. For example, for a 22KW frequency converter, there is at least 45 current on the PN terminal (value current bus), If there is a problem with the "connection control circuit" part (such as a quality issue with relays or thyristors), the charging resistor will be damaged due to excessive heating after the frequency converter is running for a while. Therefore, the charging resistor is connected in series in the charging circuit, playing a role in limiting current charging at the moment of power on, to protect some input circuit devices such as rectifiers. Some books also refer to it as a slow resistor or starting resistor.

The high-power wound cathode produced by Shell Electric is made of chromium wire or copper wire wound on ceramic tubes, and can be divided into fixed and adjustable types. According to the different usage environments of customers, there are two types of surface protection: painted and glazed. The characteristics of high-power wound anode include high power, high heat dissipation, and high stability. It has low noise during operation, is stable and reliable, and can withstand high temperatures. It can still operate normally at an ambient temperature of 170 ° C. But it has a large volume and relatively low resistance, mostly below 100K0. Additionally, due to structural reasons, its distributed capacitance and inductance coefficients are relatively large and cannot be used in high-frequency circuits. This type of resistor is usually used for voltage reduction or load reduction in high-power circuits.

The braking resistor and braking unit are two independent devices, although they are always connected together for use, so the difference is very obvious. A braking resistor is a resistor used to consume energy.