The meaning of XWEJ bipolar horizontal 8000 series cycloidal pinwheel reducer is: 8000 series bipolar horizontal reducer with motor disc and motor type The meaning of XWEK bipolar horizontal 8000 series cycloidal pinwheel reducer is: 8000 series bipolar horizontal reducer with motor disc, non electrified model. The difference between them is that one comes with a motor and the other doesn't. The meaning of XWED bipolar horizontal 8000 series cycloidal pinwheel reducer is: 8000 series bipolar horizontal reducer, motor direct connection type, without the middle motor connecting plate. These three have their own advantages, but the installation and use are the same, it's just a matter of price, XWEK***， But the customer needs to bring their own motor. XWEJ is expensive, but repairing the motor is very convenient. Just remove the motor and replace it with a new one. XWED has a reasonable price, but repairing it is more complicated. If there is a problem, it needs to be disassembled extensively. If the customer wants to customize the motor themselves or specify a special motor manufacturer or motor model, * * XWEK type is more suitable.