Speed Measurement

Examples

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

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

Ports

Input

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θ — Angular position of rotor
scalar

Angular position of the rotor specified in either radians, degrees, or per-unit.

Data Types: single | double | fixed point

Output

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⍵ — Angular speed of rotor
scalar

Angular speed that the block computes based on the angular position input.

Data Types: single | double | fixed point

Parameters

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Position unit — Unit of angular position
`Radians` (default) | `Degrees` | `Per unit`

The unit of the angular position θ.

Position scaling datatype — Range for mapping input position
`uint32` (default) | `uint16` | `uint64`

Range used to map input position internally to fit in the unsigned integer datatype. For example, the block scales an input in the range (0 - 2π) to (0 - (2³²-1)) for uint32 datatype.

Speed calculation criteria — Method of speed calculation
`Maximum application speed` (default) | `Speed resolution` | `Time interval for speed calculation`

The speed calculation method used in the block. The selected method determines the range of the rotor speed that the block can measure.

These parameters change values according to the Speed calculation criteria parameter:

Parameter name	Maximum application speed	Speed Resolution	Time interval for speed calculation
Delays for speed calculation (number of samples)	`299`	`28`	`28`
Maximum measurable speed (RPM)	`1000`	`10344.8276`	`10713.2857`
Measurable speed resolution (RPM)	`4.6566e-07`	`4.9892e-06`	`4.9892e-06`

Discrete step size (s) — Sample time after which block executes again
`100e-6` (default) | scalar

The fixed time interval (in seconds) between every two consecutive instances of block execution.

These parameters change values according to the Discrete step size (s) parameter value:

Delays for speed calculation (number of samples)
Maximum measurable speed (RPM)
Measurable speed resolution (RPM)

Maximum application speed (RPM) — Maximum measurable rotor speed
`1000` (default) | scalar

The maximum rotor speed (in rotations per minute) that the block can measure.

These parameters change values according to the Maximum application speed (RPM) parameter value:

Delays for speed calculation (number of samples)
Maximum measurable speed (RPM)
Measurable speed resolution (RPM)

Dependencies

To enable this parameter, set Speed calculation criteria to Maximum application speed.

Speed Resolution (RPM) — Minimum detectable speed
`5e-6` (default) | scalar

The minimum value of change in the θ input per unit time that the block can detect.

These parameters change values according to the Speed Resolution (RPM) parameter value:

Delays for speed calculation (number of samples)
Maximum measurable speed (RPM)
Measurable speed resolution (RPM)

Dependencies

To enable this parameter, set Speed calculation criteria to Speed resolution.

Delays for speed calculation (number of samples) — Number of angular position samples measured
`299` or `28` (default) | scalar

The number of samples of the angular position input that the block measures to compute the average position value.

These parameters change values according to the Delays for speed calculation (number of samples) parameter value:

Maximum measurable speed (RPM)
Measurable speed resolution (RPM)

Dependencies

To enable this parameter, set Speed calculation criteria to Time interval for speed calculation.

Maximum measurable speed (RPM) — Maximum measurable speed
`1000` or `10344.8276` or `10713.2857` (default) | scalar

The absolute maximum speed that the block can measure.

This parameter is not configurable and uses a value that is internally computed using other parameters.

Measurable speed resolution (RPM) — Minimum speed resolution used for speed computation
`4.6566e-07` or `4.9892e-06` (default) | scalar

The minimum speed resolution that the block uses for speed computation. It is always less than or equal to Speed Resolution (RPM).

This parameter is not configurable and uses a value that is internally computed using other parameters.

Speed unit — Unit of angular speed output
`RPM` (default) | `Degrees/Sec` | `Radians/Sec` | `Per unit based on maximum measurable speed` | `Per unit based on dialog`

Unit of the angular speed output.

Per unit speed (RPM) — Speed (in RPM) for per-unit calculation
`1000` (default)

Specify the speed in RPM for per-unit calculation.

Dependencies

This parameter appears only if Per unit based on dialog is selected for Speed unit.

Speed data type — Data type of angular speed output
`single` (default) | `double` | `fixed point`

The data type of the angular speed output ⍵.

Note

The Speed Measurement block may occasionally display the warning message 'Wrap on overflow detected.'

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 a single, 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).
SharingFactor	Number of functionally equivalent resources to map to a single shared resource. The default is 0. See also Resource Sharing (HDL Coder).

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

Version History

Introduced in R2020a

Speed Measurement

Description

Examples

Field-Oriented Control of Induction Motor Using Speed Sensor

Field-Weakening Control (with MTPA) of PMSM

Field-Oriented Control of PMSM Using Hall Sensor

Field-Oriented Control of PMSM Using Quadrature Encoder

Ports

Input

θ — Angular position of rotor
scalar

Output

⍵ — Angular speed of rotor
scalar

Parameters

Position unit — Unit of angular position
`Radians` (default) | `Degrees` | `Per unit`

Position scaling datatype — Range for mapping input position
`uint32` (default) | `uint16` | `uint64`

Speed calculation criteria — Method of speed calculation
`Maximum application speed` (default) | `Speed resolution` | `Time interval for speed calculation`

Discrete step size (s) — Sample time after which block executes again
`100e-6` (default) | scalar

Maximum application speed (RPM) — Maximum measurable rotor speed
`1000` (default) | scalar

Dependencies

Speed Resolution (RPM) — Minimum detectable speed
`5e-6` (default) | scalar

Dependencies

Delays for speed calculation (number of samples) — Number of angular position samples measured
`299` or `28` (default) | scalar

Dependencies

Maximum measurable speed (RPM) — Maximum measurable speed
`1000` or `10344.8276` or `10713.2857` (default) | scalar

Measurable speed resolution (RPM) — Minimum speed resolution used for speed computation
`4.6566e-07` or `4.9892e-06` (default) | scalar

Speed unit — Unit of angular speed output
`RPM` (default) | `Degrees/Sec` | `Radians/Sec` | `Per unit based on maximum measurable speed` | `Per unit based on dialog`

Per unit speed (RPM) — Speed (in RPM) for per-unit calculation
`1000` (default)

Dependencies

Speed data type — Data type of angular speed output
`single` (default) | `double` | `fixed point`

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™.

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

Version History

See Also

Topics

Speed Measurement

Description

Examples

Field-Oriented Control of Induction Motor Using Speed Sensor

Field-Weakening Control (with MTPA) of PMSM

Field-Oriented Control of PMSM Using Hall Sensor

Field-Oriented Control of PMSM Using Quadrature Encoder

Ports

Input

θ — Angular position of rotor scalar

Output

⍵ — Angular speed of rotor scalar

Parameters

Position unit — Unit of angular position Radians (default) | Degrees | Per unit

Position scaling datatype — Range for mapping input position uint32 (default) | uint16 | uint64

Speed calculation criteria — Method of speed calculation Maximum application speed (default) | Speed resolution | Time interval for speed calculation

Discrete step size (s) — Sample time after which block executes again 100e-6 (default) | scalar

Maximum application speed (RPM) — Maximum measurable rotor speed 1000 (default) | scalar

Dependencies

Speed Resolution (RPM) — Minimum detectable speed 5e-6 (default) | scalar

Dependencies

Delays for speed calculation (number of samples) — Number of angular position samples measured 299 or 28 (default) | scalar

Dependencies

Maximum measurable speed (RPM) — Maximum measurable speed 1000 or 10344.8276 or 10713.2857 (default) | scalar

Measurable speed resolution (RPM) — Minimum speed resolution used for speed computation 4.6566e-07 or 4.9892e-06 (default) | scalar

Speed unit — Unit of angular speed output RPM (default) | Degrees/Sec | Radians/Sec | Per unit based on maximum measurable speed | Per unit based on dialog

Per unit speed (RPM) — Speed (in RPM) for per-unit calculation 1000 (default)

Dependencies

Speed data type — Data type of angular speed output single (default) | double | fixed point

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™.

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

Version History

See Also

Topics

θ — Angular position of rotor
scalar

⍵ — Angular speed of rotor
scalar

Position unit — Unit of angular position
`Radians` (default) | `Degrees` | `Per unit`

Position scaling datatype — Range for mapping input position
`uint32` (default) | `uint16` | `uint64`

Speed calculation criteria — Method of speed calculation
`Maximum application speed` (default) | `Speed resolution` | `Time interval for speed calculation`

Discrete step size (s) — Sample time after which block executes again
`100e-6` (default) | scalar

Maximum application speed (RPM) — Maximum measurable rotor speed
`1000` (default) | scalar

Speed Resolution (RPM) — Minimum detectable speed
`5e-6` (default) | scalar

Delays for speed calculation (number of samples) — Number of angular position samples measured
`299` or `28` (default) | scalar

Maximum measurable speed (RPM) — Maximum measurable speed
`1000` or `10344.8276` or `10713.2857` (default) | scalar

Measurable speed resolution (RPM) — Minimum speed resolution used for speed computation
`4.6566e-07` or `4.9892e-06` (default) | scalar

Speed unit — Unit of angular speed output
`RPM` (default) | `Degrees/Sec` | `Radians/Sec` | `Per unit based on maximum measurable speed` | `Per unit based on dialog`

Per unit speed (RPM) — Speed (in RPM) for per-unit calculation
`1000` (default)

Speed data type — Data type of angular speed output
`single` (default) | `double` | `fixed point`

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™.

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