Permanent magnet generator temperature control system

Abstract

The invention provides a permanent magnet generator temperature control system. The permanent magnet generator temperature control system comprises a temperature sensor, a signal amplifier, an analog / digital (A / D) switching circuit, a main control central processing unit (CPU), a digital / analog (D / A) switching circuit, a drive circuit and an actuator. The temperature sensor is arranged on the surface of a permanent magnet of a permanent magnet generator and connected with the signal amplifier, the signal amplifier is connected with the A / D switching circuit, the A / D switching circuit is connected with the main control CPU, the main control CPU is connected with the D / A switching circuit, the D / A switching circuit is connected with the drive circuit, and the driver circuit is connected with the actuator. The actuator comprises a variable pitch motor, a converter and a generator cooling fan. The permanent magnet generator temperature control system is used for temperature control of the permanent magnet generator.

Description

technical field [0001] The invention relates to a temperature control system, in particular to a permanent magnet generator temperature control system in the field of wind power generation. Background technique [0002] In the prior art, megawatt-level high-power permanent magnet generators are mostly used in wind power. As the core components of wind turbines, sintered NdFeB has a large magnetic energy product and intrinsic coercive force. At present, rare earths are mostly used. It is made of permanent magnet material, but the remanent induction temperature coefficient and intrinsic coercivity coefficient of sintered NdFeB permanent magnets are relatively large compared to other permanent magnets, so the stability of temperature coefficients is relatively poor. When the temperature of the permanent magnet generator is close to or exceeds the stable working temperature of NdFeB, which is 140°C, the permanent magnet is prone to thermal demagnetization, the insulation is agin...

AI Technical Summary

Problems solved by technology

The traditional temperature control system attaches temperature sensors to the front and rear spindles of the generator, which cannot directly monitor the temperature change of the permanent magnet; the general controller will give an alarm when the generator temperature exceeds the set value, turn on the cooling fan, and stop the generator if the temperature exceeds the limit value deal with

There are frequent start and stop phenomena when the generator set is overheated

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