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Speed Measurement

Compute speed from rotor angular position

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  • Library:

  • Motor Control Blockset / Sensor Decoders

Description

TheSpeed Measurementblock calculates the angular speed from the angular position of the rotor by calculating the change in the angular position with respect to time.

Ports

Input

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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 that the block computes based on the angular position input.

Data Types:single|double|fixed point

Parameters

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The unit of the angular positionθ.

The data type of the angular position inputθ.

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 theSpeed calculation criteriaparameter:

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

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

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

  • Delays for speed calculation (number of samples)

  • Maximum measurable speed (RPM)

  • Measurable speed resolution (RPM)

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

These parameters change values according to theMaximum 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, setSpeed calculation criteriatoMaximum application speed.

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

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

  • Delays for speed calculation (number of samples)

  • Maximum measurable speed (RPM)

  • Measurable speed resolution (RPM)

Dependencies

To enable this parameter, setSpeed calculation criteriatoSpeed resolution.

角位置inpu样本的数量t that the block measures to compute the average position value.

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

  • Maximum measurable speed (RPM)

  • Measurable speed resolution (RPM)

Dependencies

To enable this parameter, setSpeed calculation criteriatoTime interval for speed calculation.

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.

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

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

Unit of the angular speed output.

Specify the speed in RPM for per-unit calculation.

Dependencies

This parameter appears only ifPer unit based on dialogis selected forSpeed unit.

The data type of the angular speed output⍵.

Note

TheSpeed Measurementblock may occasionally display the warning message'Wrap on overflow detected.'

Model Examples

Field-Oriented Control of Induction Motor Using Speed Sensor

Field-Oriented Control of Induction Motor Using Speed Sensor

实现了磁场定向控制(FOC)技术que 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 Example
Field-Weakening Control (with MTPA) of PMSM

Field-Weakening Control (with MTPA) of PMSM

实现了磁场定向控制(FOC)技术que 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 Example
Field-Oriented Control of PMSM Using Hall Sensor

Field-Oriented Control of PMSM Using Hall Sensor

实现了磁场定向控制(FOC)技术que 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 Example
Field-Oriented Control of PMSM Using Quadrature Encoder

Field-Oriented Control of PMSM Using Quadrature Encoder

实现了磁场定向控制(FOC)技术que 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 Example

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

See Also

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