Vector Control Reference

Compute d and q axis components of reference vector

Since R2020a

• 

Libraries:
Motor Control Blockset / Controls / Control Reference

Description

The Vector Control Reference block calculates the d-axis and q-axis components of the reference voltage, current, or flux vector that you provide as an input to the block.

The block accepts magnitude and position of the reference vector as inputs. The block outputs the reference vector components along the direct and quadrature axes of the rotating dq reference frame.

Equations

The block uses these equations to compute the d-axis and q-axis vector component outputs.

$$d^{ref}=ma{g}^{ref}\times \text{cos}{\theta }_e$$

$$q^{ref}=ma{g}^{ref}\times \text{sin}{\theta }_e$$

where:

• $$d^{ref}$$ is the d-axis component of the reference vector.

• $$q^{ref}$$ is the q-axis component of the reference vector.

• $$ma{g}^{ref}$$ is the magnitude of the reference vector.

• $${\theta }_e$$ is the electrical position of the reference vector.

Examples

Field-Weakening Control (with MTPA) of PMSM

Implements the field-oriented control (FOC) technique to control the torque and speed of a three-phase permanent magnet synchronous motor (PMSM). The FOC algorithm requires rotor position feedback, which is obtained by a quadrature encoder sensor. For details about FOC, see Field-Oriented Control (FOC).

• Open Model

Ports

Input

mag^ref — Magnitude of reference vector

scalar

Magnitude of the reference voltage, current, or flux vector that you provide as an input to the block.

Data Types: single | double | fixed point

θ_e — Electrical position of reference vector

scalar

Electrical position of the reference voltage, current, or flux vector that you provide as an input to the block.

Data Types: single | double | fixed point

Output

d^ref — d-axis component of reference vector

scalar

Reference voltage, current, or flux vector component along the direct axis of the rotating dq reference frame.

Data Types: single | double | fixed point

q^ref — q-axis component of reference vector

scalar

Reference voltage, current, or flux vector component along the quadrature axis of the rotating dq reference frame.

Data Types: single | double | fixed point

Parameters

Alpha (phase-a) axis alignment — dq reference frame alignment

D-axis (default) | Q-axis

Align either the d- or q-axis of the rotating reference frame to the α-axis of the stationary reference frame.

Theta units — Unit of input position value

Per-unit (default) | Radians | Degrees

Unit of the input electrical position of the reference voltage, current, or flux vector.

Number of data points for trigonometric lookup table — Size of lookup table array

1024 (default) | scalar

Size of the lookup table array.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.

Version History

Introduced in R2020a