To overcome the problems caused by the controller compensation and temperature compensation in the analog rebalance loop

the method and implementation of the digital control were researched.A highly precision

adjustable three-phase inverter power source of Dynamically Tuned Gyroscope(DTG) motor was designed using SVPWM method based on DSP to solve the problems on adjusting the frequency

low stability of phase and low efficiency of motor power source. The two-input-two-output frequency characteristic analyzer was designed using dSPACE Hardware-in-loop(HIL) system

the open loop discrete transfer function matrix of digital rebalance loop was identified. Based on matrix inverse and traditional controller method the decoupling and compensation controller was designed to get better dynamic performance of DTG. The experiment shows that the frequency stability of designed DTG motor power source is better than ±1.5×10

－6

waveform distortion is lower than 5%

which meets the demand of DTG. The band width of lock loop under control is higher than 70 Hz

overshoot is lower than 5%

rising time is shorter than 5 ms

and the cross coupling is lower than 1% between the two axis when there is a 10 Hz sinusoidal input

which has better dynamic performance than the analog rebalance loop in guaranteeing the stability margin

establishing the basis of modern control method application in DTG rebalance loop.