The process cannot be changed; this is the way to prevent the motor from burning out
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We have a process here that involves removing solvents, and it’s necessary to keep stirring continuously until the mixture becomes very viscous. At that point, the current overload protection triggers and the process comes to an end. However, sometimes the protective devices don’t function properly, which results in the motor being damaged. We use simple thermal relays; there is no other protective software in use. Do anyone have any good ideas or suggestions to solve this problem?
Replace it with a motor one size larger; the thermal relay hasn’t been adjusted. I’m not sure if this will work
Motor with PTC, or equipped with a motor smart protector
Control is achieved using an inverter, with the constant torque output mode selected. First, you need to roughly estimate the required torque of the stirrer at the highest viscosity
Install an ammeter at the operation site, set the shutdown current threshold for high-level alarms; such alarms prompt the operator to shut down the motor, while extremely high values trigger automatic motor shutdown
I’m not sure if it’s possible to stop stirring based on a time setting.
There is no need for calculations; it can be measured directly on site and then fine-tuned.
There is no need for calculations; it can be measured directly on site and then fine-tuned.
To drive a motor, a motor with higher power is definitely required. When a frequency converter is added, and the power remains unchanged, an increase in the viscosity of the material will cause the speed to decrease. It is recommended to use a motor with higher power; if possible, install a coupling with torque overload protection between the motor and the mixer
In some markets, there are devices with high sensitivity for both loaded and unloaded conditions; they are cost-effective and suitable for small businesses.
Thermal protection takes some time to activate. For your protection system, you can use a combination of an over-torque signal and a thermal protection signal in parallel, so as to trip the motor’s main circuit breaker or switch; at the same time, the relevant signals are sent to the alarm system of the automatic control system.