Mechanical to Electrical Position

Compute electrical position of rotor from mechanical position

Since R2020a

• 

Libraries:
Motor Control Blockset / Sensor Decoders
Motor Control Blockset HDL Support / Sensor Decoders

Description

The Mechanical to Electrical Position block computes the electrical position of rotor by using its mechanical position, mechanical offset value, and the number of pole-pairs.

Examples

Field-Oriented Control of PMSM Using Hall Sensor

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

• Open Model

Field-Oriented Control of PMSM Using Quadrature Encoder

Implements the field-oriented control (FOC) technique to control the 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

Field-Oriented Control of Induction Motor Using Speed Sensor

Implements the field-oriented control (FOC) technique to control the speed of a three-phase AC induction motor (ACIM). The FOC algorithm requires rotor speed feedback, which is obtained in this example by using a quadrature encoder sensor. For details about FOC, see Field-Oriented Control (FOC).

• Open Model

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

θ_m — Mechanical position of rotor

scalar

The mechanical position of rotor (as output by the rotor position sensor) in either radians (0 to 2$$\pi$$), degrees (0 to 360), or per unit (0 to 1).

Data Types: single | double | fixed point

N_pp — Number of pole pairs available in motor

scalar

Number of pole pairs available in the motor.

Dependencies

To enable this port, set the Pole pairs input parameter to Input port.

Data Types: single | double | fixed point

Offset — Mechanical position offset

scalar

The amount by which the electrical zero of the rotor deviates from the mechanical zero position. Unit of offset is identical to the unit of the mechanical position input.

Dependencies

To enable this port, set Specify offset via to Input port.

Data Types: single | double | fixed point

Note

The values that you specify at all the input ports should have the same data type.

Output

θ_e — Electrical position of rotor

scalar

The electrical position of the rotor with a range that is identical to that of the mechanical position input. Data type of the electrical position is identical to that of the input.

Data Types: single | double | fixed point

Parameters

Pole pairs input — Method to specify number of pole pairs available in motor

Specify via dialog (default) | Input port

The method you want to use to specify the number of pole pairs available in the motor. Select Input port to enable and use the input port N_pp. Select Specify via dialog to provide the number of pole pairs using the dialog box.

Number of pole pairs — Number of pole pairs available in motor

4 (default) | scalar

Number of pole pairs available in the motor.

Dependencies

To enable this parameter, set the Pole pairs input parameter to Specify via dialog.

Input mechanical angle unit — Unit of mechanical position of rotor

Per unit (default) | Radians | Degrees

Unit of the mechanical position of the rotor.

Offset input type — Method to specify offset

Input port (default) | Specify via dialog

Method to specify the mechanical position offset.

• Select Input port to enable and use the input port Offset.

• Select Specify via dialog to enable the Mechanical offset parameter and provide the offset value.

Mechanical offset — Value of mechanical position offset

0 (default) | scalar

Specify the mechanical position offset value in this parameter. The unit of the offset must be identical to the unit of the mechanical position input.

Dependencies

To enable this parameter, set Offset input type to Specify via dialog.

Input data type — Data type of input ports

single (default) | double | fixed point

The data type that you want to use for the input ports.

Note

If you select fixed point input data type and provide fixed point values to the input ports, the block runs faster when deployed on hardware.

Extended Capabilities

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

HDL Code Generation

Generate VHDL, Verilog and SystemVerilog code for FPGA and ASIC designs using HDL Coder™.

HDL Coder™ provides additional configuration options that affect HDL implementation and synthesized logic.

HDL Architecture

This block has one default HDL architecture.

HDL Block Properties

ConstrainedOutputPipeline	Number of registers to place at the outputs by moving existing delays within your design. Distributed pipelining does not redistribute these registers. The default is 0. For more details, see ConstrainedOutputPipeline (HDL Coder).
InputPipeline	Number of input pipeline stages to insert in the generated code. Distributed pipelining and constrained output pipelining can move these registers. The default is 0. For more details, see InputPipeline (HDL Coder).
OutputPipeline	Number of output pipeline stages to insert in the generated code. Distributed pipelining and constrained output pipelining can move these registers. The default is 0. For more details, see OutputPipeline (HDL Coder).

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

Version History

Introduced in R2020a