III. RESULTS AND DISCUSSION
The module of BLDCM rotating speed and current double
closed loop control systems which is established in the
environment of Simulink is simulated in this work. The
simulated parameters are set as follows: DC voltage 200V,
moment of inertia of system J =0.005 kg ⋅ m2,damp
coefficient B =0.0008 N ⋅ m ⋅ s/rad, rating rotating speed of
BLDCM n =1000r/min, number of pole pairs p =1, phase
resistance of stator winding R = 0.5Ω , self inductance of
phase winding L =0.05H, mutual inductance of phase winding
M =0.01H. The controller parameters of double closed loop
are set as follow: Kp = 10, Ki = 0.01, Kd =0.03, saturation
bound of output ± 20, lag loop width of current loop 0.2A,
sampling period 0.001s. The system is started in the state of no
load. After it is in steady state at 0.4s, the system is loaded 3
N ⋅ m, and at 1s, the load abruptly becomes 1 N ⋅ m. The
simulated result of rotating speed, three-phase current of threephase
winding and electromagnetism torque are in the
Fig.9