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ACIM Torque Estimator

Estimate electromechanical torque and power

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Motor Control Blockset / Controls / Control Reference

Description

The ACIM Torque Estimator block generates electromechanical torque and power estimates for an induction motor.

The block accepts feedback values of d- and q-axis stator current and mechanical speed as inputs.

Equations

If you select Per-Unit (PU) in the Input units parameter, the block converts the inputs to SI units before performing any computation. After calculating the output, the block converts the output back to per unit values.

These equations describe the computation of electromechanical torque and power estimates by the block.

$T_{e} = \frac{3}{2} p (\frac{L_{m}}{L_{r}}) λ_{r d} i_{s q}$

$P_{e} = T_{e} \times ω_{m}$

where:

$p$ is the number of pole pairs available in the motor.
$L_{m}$ is the magnetizing inductance of the motor (Henry).
$L_{r}$ is the rotor inductance (Henry).
$λ_{r d}$ is the d-axis flux linkage of the rotor (Weber).
$i_{s q}$ is the stator q-axis current (Amperes).
$ω_{m}$ is the mechanical speed of the rotor (Radians/ sec).

Ports

Input

`I_sd` — D-axis stator current
scalar

Stator current along the d-axis of the rotating dq reference frame.

Data Types: single | double | fixed point

`I_sq` — Q-axis stator current
scalar

Stator current along the q-axis of the rotating dq reference frame.

Data Types: single | double | fixed point

`ω_m` — Mechanical speed of rotor
scalar

Mechanical speed of the rotor.

Data Types: single | double | fixed point

Output

`T_e` — Electromechanical torque
scalar

Electromechanical torque of the rotor.

Data Types: single | double | fixed point

`P_e` — Electromechanical power
scalar

Electromechanical power of the rotor.

Data Types: single | double | fixed point

Parameters

`Number of pole pairs` — Number of pole pairs available in motor
`2` (default) | scalar

Number of pole pairs available in the induction motor.

`Stator leakage inductance (H)` — Leakage inductance of stator winding
`6.81e-3` (default) | scalar

Inductance due to leakage flux linked to the stator winding (in Henry).

`Rotor leakage inductance (H)` — Leakage inductance of rotor winding
`6.81e-3` (default) | scalar

Inductance due to leakage flux linked to the rotor winding (in Henry).

`Magnetizing Inductance (H)` — Magnetizing inductance of induction motor
`30e-3` (default) | scalar

Inductance due to the magnetizing flux (in Henry)..

`Rated Flux (Wb)` — Rated flux of motor
`38.2e-3` (default) | scalar

Rated flux of the induction motor (in Weber).

`Input units` — Unit of input values
`Per-Unit (PU)` (default) | `SI Units`

Unit of the input values.

`Base Voltage (V)` — Base voltage for per-unit system
`24/sqrt(3)` (default) | scalar

Base voltage (in Volts) for per-unit system.

Dependencies

To enable this parameter, set Input units to Per-Unit (PU).

`Base Current (A)` — Base current for per-unit system
`5.3611` (default) | scalar

Base current (in Amperes) for per-unit system.

Dependencies

To enable this parameter, set Input units to Per-Unit (PU).

`Base Speed (rpm)` — Base speed for per-unit system
`1500` (default) | scalar

Base speed (in rpm) for per-unit system.

Dependencies

To enable this parameter, set Input units to Per-Unit (PU).

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™.

See Also

Topics

Field-Oriented Control of Induction Motor Using Speed Sensor

Introduced in R2020b

Motor Control Blockset Documentation

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