Philips coffee grinder defective?

Hello, my Philips 2231 suddenly ground for a short time and then went into error.
I removed the grinder, cleaned it and ran the motor on a 20 volt laptop power supply and then reinstalled it. When the bean container was empty, it ran normally, so I cleaned it and put the beans in. When it started up, you could hear that the more beans were put in, the more the motor lost speed. And then the old error again.
Capacitors all look normal. I don't even know which one is responsible for the grinder.
What do you think about the motor or electronics?

There is no sensor for the motor on the machine

The motor will be defective. The newer ones don't last as long.

Yes, thank you was really the engine!