Overtemperature protection device, motor and overtemperature protection method thereof

Abstract

The invention discloses an overtemperature protection device, an electric motor and an overtemperature protection method thereof. The device comprises an overcurrent protection unit and/or a PTC protection unit, wherein the overcurrent protection unit is configured to reduce the current current by controlling the load power of the motor to which the power device belongs when the current current ofthe power device to be protected is greater than or equal to a set overcurrent detection value; and/or, the PTC protection unit, together with the power device to be protected, is configured to reduce the current current of the power device by increasing its own resistance in a case where the current temperature of the power device is greater than or equal to a set thermosensitive temperature value, thereby reducing the current temperature. The scheme of the invention can solve the problem of inaccurate temperature sampling in the temperature detection using the temperature or the functionalrelationship between the temperature rise and the current, so as to achieve the effect of improving the accuracy of the temperature sampling.

Description

Technical field [0001] The present invention belongs to the technical field of over-temperature protection, and specifically relates to an over-temperature protection device, a motor and an over-temperature protection method thereof, and in particular to a hardware-implemented power device high-temperature current suppression device, a motor having the device, and a motor High-temperature current suppression method for power devices. Background technique [0002] In modern society, with the development of the economy, people have higher and higher requirements for the quality of life, and household appliances have also increased. However, electrical fires caused by failure of household appliances also affect people’s safety, so electrical safety is particularly important. Most of it is due to the large current when the power device is running, causing serious damage to the connection or power device heating, and causing fire. When the current exceeds the upper limit when the elec...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to, aiming at the above-mentioned defects, provide an over-temperature protection device, a motor and an over-temperature protection method thereof, so as to solve the functional relationship between temperature or temperature rise and current used in temperature detection in the prior art. Detect the problem of inaccurate temperature sampling to achieve the effect of improving the accuracy of temperature sampling

Images