UM0324 datasheet(71/105 Pages) STMICROELECTRONICS

71 / 105 page

UM0324

Library functions

71/105

Figure 42.

Circle limitation working principle

Vd and Vq represent the saturated stator voltage component to be passed to the SVPWM

block. From geometrical considerations, it is possible to draw the following relationship:

In order to speed up the computation of the above equations while keeping an adequate

resolution, the value

is computed and stored in a look-up table for different values of

. Furthermore,

considering that MMI depends on the selected PWM frequency, a look-up table is stored in

‘MC_Clarke_Park.h’ (with MMI ranging from 92 to 100).

Once you have selected the required PWM switching frequency, you should uncomment the

Max Modulation Index definition corresponding to the selected PWM frequency in the

MC_Control_Param.h

definitions list shown below.

//#define MAX_MODULATION_100_PER_CENT

// 100% max modulation index

//#define MAX_MODULATION_99_PER_CENT

// 99% max modulation index

//#define MAX_MODULATION_98_PER_CENT

// 98% max modulation index

//#define MAX_MODULATION_97_PER_CENT

// 97% max modulation index

//#define MAX_MODULATION_96_PER_CENT

// 96% max modulation index

//#define MAX_MODULATION_95_PER_CENT

// 95% max modulation index

//#define MAX_MODULATION_94_PER_CENT

// 94% max modulation index

//#define MAX_MODULATION_93_PER_CENT

// 93% max modulation index

//#define MAX_MODULATION_92_PER_CENT

// 92% max modulation index

S16_MAX

MMI

⋅

S16_MAX

MMI

⋅

S16_MAX

MMI

⋅

UM0324 Datasheet(PDF) 71 Page - STMicroelectronics

UM0324 Datasheet(HTML) 71 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL