Motor thermal protection device and operation method thereof
A protection device and motor heat technology, applied in emergency protection circuit devices, electromechanical devices, circuit devices, etc., can solve problems such as low accuracy, inability to accurately track the accumulated heat of the motor in real time, and inability to know the remaining accumulated heat of the motor.
Pending Publication Date: 2022-01-18
SCHNEIDER ELECTRIC IND SAS
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Problems solved by technology
The current motor thermal protection device cannot accurately track and monitor the accumulated heat of the motor in real time and judge the thermal state of the motor because it cannot know the remaining heat accumulated when the motor is powered on.
If you rely on the experience of the staff to judge, it may lead to unnecessary accidents due to low accuracy; it may not be allowed to use the motor after waiting enough time for the motor to completely cool down the accumulated heat (generally, at least 50 minutes)
Method used
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[0015] Hereinafter, the present disclosure will be described in detail with reference to exemplary embodiments of the present disclosure. However, the present disclosure is not limited to the embodiments described herein, and it may be embodied in many different forms. The described embodiments are only intended to make the present disclosure thorough and complete, and fully convey the concept of the present disclosure to those skilled in the art. Features of the various described embodiments can be combined or substituted for each other, unless explicitly excluded or should be excluded according to the context.
[0016] For motor thermal protection, thermal overload relays that are easy to install and low in cost are often used in industry. However, the traditional thermal overload relay cannot know the power-off time of the motor from the last power-off to the power-on when the motor is powered on, so it cannot obtain the remaining heat accumulated when the motor is powered...
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The invention discloses a motor thermal protection device and an operation method thereof. The motor thermal protection device is powered by a power supply of a motor, and comprises a capacitor timing circuit used for timing after the motor is powered off; a power-off time determining unit which is used for executing a reading operation of reading the output voltage of the capacitance timing circuit after the motor is powered on, and determining the power-off time from the power-off time of the motor to the power-on time of the motor according to the output voltage; and an accumulated heat calculation unit which is used for calculating the residual accumulated heat when the motor is powered on according to the power-off time and the accumulated heat when the motor is powered off.
Description
technical field [0001] The present disclosure relates to a motor thermal protection device and a method of operating the motor thermal protection device. Background technique [0002] Continuous operation of electromechanical equipment is often required in industrial processes. Accidents caused by motor overheating or temperature control failure occur from time to time. The use of motor thermal protection devices can automatically cut off power when the motor is overheated to protect the motor and electromechanical equipment in the circuit. The current motor thermal protection device cannot accurately track and monitor the accumulated heat of the motor in real time and judge the thermal state of the motor because it cannot know the remaining heat accumulated when the motor is powered on. If you rely on the experience of the staff to judge, it may lead to unnecessary accidents due to low accuracy; it may not be allowed to use the motor after waiting enough time for the motor ...
Claims
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IPC IPC(8): H02H7/085
CPCH02H7/085H02H6/005H02H3/006H02P29/60G01K7/42G01K3/04H02H7/0852H02H7/0833H02H5/04H02K11/25G01R31/343
Inventor 周张吉石磊石莹双兵赵海军王文华孙爽刘思雨
Owner SCHNEIDER ELECTRIC IND SAS