Reversing polarity at High frequency

i trying drive bldc hub  motor project.when connected(that color codes of wires though bldc motor join same color coded wires of motor driver) ,the motor runs in anti-clockwise direction.for reversing motor direction,i need reverse pair of hall effect sensing wires , same case vcc wires.(my motor has 3 hall effect sensing wires , 3 vcc wires corresponding 3 coils in bldc , of coarse 1 ground).i have reversed direction of motor through procedure.but when comes application of pid on motor,i may positive velocity , negative velocity @ high frequency.for may need reverse polarity @ rate(around 100 150hz pid max freqency in values update).
take account bldc motor huge one,it draws 7 amps , voltage supplied must 48v.
also if during polairty reversal,two vcc wires gets short ,then damage motor driver 1 of kind only.
solutions tried me:
using 2 spdt relays.but problem high frequency of polarity reversal,two vcc wires shorted @ 10hz rate when switching relays @ 100hz.


anyone please give me solution problem other dpdt relay unavailable me.i want kind of electronic circuit no moving parts.may using transisitors or mosphets or else.
two days go final submission.
remember want polarity reversal @ high frequency without getting shorted .

isn't done complex module, this one.
leo..

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