When you stop a fast moving motor quickly, any motor, brushed DC, brushless-DC/PMSM,stepper... The conversion of mechanical energy to electrical means a big back-emf spike gets produced whilst the rotor comes to a halt.
As the back-emf can never get above the motor's driving voltage, is it a rule of thumb that the maximum voltage seen in such a spike cannot ever get above 2*V_supply? Would this then mean that any risks of electrical damage from ast braking are avoided so long as the components involved in driving the motor, and anything else connected to the supply rail of any h-bridges involved... , are rated to cope with >2*the_voltage_actually_used_as_the_supply ?
Thanks