Table 2.
Meanings of variables.
| Symbol | Meaning |
|---|---|
| Udc | Intermediate DC voltage |
| id | d-axis current of the motor |
| iq | q-axis current of the motor |
| θe | Motor rotor angular position |
| ωe | Motor rotor angular speed |
| ud | Inverter output d-axis voltage |
| uq | Inverter output q-axis voltage |
| uα | The inverter outputs the α-axis voltage |
| uβ | The inverter outputs the β-axis voltage |
| ua | The inverter outputs the A-phase voltage |
| ub | The inverter outputs the B-phase voltage |
| uc | The inverter outputs the C-phase voltage |
| iα | Motor α-axis current |
| iβ | Motor β-axis current |
| did | Differential of d-axis current of motor |
| diq | Differential of q-axis current of motor |
| dθe | Differential angle position of motor rotor |
| Sa, Sb, Sc | Inverter pulse control signal |
| yUdc | Sampling value of the intermediate DC voltage sensor |
| yIa | Motor phase-A current sensor sampling value |
| yIb | Motor phase-B current sensor sampling value |
| yθn | Motor rotor position sensor sampling value |
| fUdc | The intermediate DC voltage sensor fault |
| fIa | The A-phase current sensor of the motor fault |
| fIb | The B-phase current sensor of the motor fault |
| fθn | The motor rotor position sensor fault |
| Rs | Stator resistance |
| Ld | Motor d-axis inductance |
| Lq | Motor q-axis inductance |
| ψf | Rotor permanent magnet linkage |
| np | Number of motor poles |