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I hope you told about velocity loop bandwidth 200Hz. And position loop bandwidth must be 2...3 times lower. As a rule an axis with linear motor has resonances frequencies higher than 100Hz. But for some cases velocity loop bandwidth maybe even >100Hz using some filters. The mechanical resonance...

Of course GND connection will be done radially to avoid voltage drop on it, i.e. all grounds must be connected at the same GND point.

The direction of Ld and lq are correct... But because d-axis is magnetic flux axis thus Ld affects magnetic flux of permanent magnets and therefore affects back-EMF and further the motors speed (field weakening effect with Id<0). And Iq affects the torque as well.

Some notes regarding sent link: 1. The slotted (aka ironcore) motor has iron core around which are wound stator coils. Therefore such motor has higher power density vs slotless one. 2. The modern power amplifiers for servo applications used motor encoder for commutation as rotor position sensor...

Such non salient motor with different Ld and Lq intended for field weakening (mostly used for EV with DC bus from battery) where both inductances are shown efficiency of this method.

If the Home positions are the same, check Modulo operation mode is activated.

Look for "On The Fly" function with modern servo controllers

The stepper motor have limited acceleration - you can check with lower acceleration firstly.

No problem with new EL7342 - it have wide encoder inputs from 5V, i.e. 5V encoder can be connected directly

The encoder has three pairs of differential signals A+,A-, B+.B-,I+,I-. For standard operation you need to use A+,A-, B+.B or A+ and B+ as single ended connection. The resolution of A,B signals is 1200 pulses per revolution; 1 pulse per revolution is for I signal. You must configure your...

Two types of motors with current 4A/8A only can be controlled by the driver with max output current 8A. The operation mode is velocity control with 6-step commutation.

It's impossible at all! The resolver is analog position sensor with sine/cos output produced under applying high frequency analog excitation. The encoder has digital A,B signals as a rule.

The regenerative braking - due to costliness - may have sense with power >5kW only. And dynamic braking is used for effective deceleration when servo closed loop is disabled.

The filter on the output side of the VFD doesn't protect both, no VFD and no motor - it decrease EMC/EMI level produced by VFD itself simply.

You must choose inverter with additional encoder input for implement Master-Slave mode.

The better way is to contact local Yaskawa representative.

You can control your DC motor with open loop by changing PWM duty cycle, but using rate control for transition processes. If you want close velocity loop control, simpler back-EMF feedback maybe helpful.

Look at Anorad, Etel, Hiwin, Schniberger, Akribis and Newport linear motors and stages manufacturers.

Maybe you need define "remote" mode for EtherCAT using RS232?

The right way is using Manual from AC servo drive manufacturer.