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Encoder Configuration Page
In
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the System Explorer
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window configuration tree, expand
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the Power Electronics Add-On
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custom device and
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select Circuit Model >> PMSM BLDC >> Encoder
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to display this page. Use this page to configure the Encoder sensor model.
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This page includes the following components:
When set to Quadrature Encoder mode, the sensor generates the A, B, and Z signals of a quadrature encoder module with a specific number of pulses per turn, according to an input angle or speed. Outputs A and B have a 90 degree phase difference that enables a decoder to retrieve the modulated signal angle and speed at any time. Configuration ParametersThe following parameters are available. They are modifiable at edit-time only:
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Channel Name | Symbol | Type | Default Value | Description |
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A | A | Output | 0 | Digital signal A generated by the encoder. When paired with B and Z, it can be used to determine the machine's position. |
B | B | Output | 0 | Digital signal B generated by the encoder. When paired with A and Z, it can be used to determine the machine's position. |
Z | Z | Output | 0 | Digital signal Z generated by the encoder. One Z pulse occurs per full rotation at the 0° machine angle |
Quadrature Encoder Description
A quadrature encoder is an angular position or motion sensor sometimes referred to as rotary encoder. The quadrature encoder model generates three square-wave pulses (A, B, Z), which can then be interpreted into the angular position of the machine θm. For an encoder with Active High polarity, a pulse is defined as a transition from low to high back to low.
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When set to Hall Effect mode, the sensor generates the A, B, and C signals which correspond to the absolute angle position. Typically A, B, and C are separated by 120° but other configurations are common. Configuration ParametersThe following parameters are available. They are modifiable at edit-time only:
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Section ChannelsWhen set to Hall Effect mode, this section includes the following custom device channels:
Hall Effect Sensor Description |
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A Hall effect sensor is |
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a device that is used to measure the magnitude of a magnetic field. Manufacturers of electrical machines will place magnetic materials on the machine at particular rotor angles to allow Hall Effect sensors to be able to detect when they are near the specific position on the machine. Through simple signal processing the voltage induced by the magnetic materials can be transformed into digital signals that turn active (true) when the Hall Effect sensor reaches the angle of the machine. The digital signals can then be used by a controller to calculate absolute position and/or speed. This Hall Effect Sensor model supports three independent sensor positions. |