# Hardware

URL: https://irs.systems/en/docs/resolver-simulation/hardware

The following chapter highlights the hardware of the module.

## Block diagram

The following figure shows the block diagram of the module. The signals on the right are accessible to the user. The signals on the left represent the Compact-RIO interface and are not described in detail in this manual.

<figure>
  <img src="/docs/assets/resolver-simulation/images/ressi-block-diagram.png" alt="Block diagram: power supply, analog and digital signal processing, isolating transformers for excitation, sine and cosine, SYNC detection">
  <figcaption>Figure 5: Block diagram</figcaption>
</figure>

All input and output signals are isolated from the Compact-RIO. The Excitation reference input, sine and cosine outputs are isolated by means of transformers. The SYNC input is digitally isolated by means of optocoupler.

## Interfaces

The user interface Signals have the following functionality. Every signal has a positive and negative terminal.

- **Excitation reference In**:
  - Input signal from the power converter to be tested
  - Typical sine wave signal of about 10V<sub>pp</sub> is applied
- **Sine / Cosine Out**:
  - Output signals from the simulation, which is an Amplitude-modulated representation of the excitation signal. Modulation is performed by software.
  - In **RVDT** mode the output signal is taken between Sin+ and Cos+ (Sin- and Cos- needs to be tied together) -> Difference output signal:
- **SYNC input (ResSi only)**:
  - This signal can be used to synchronize the modulation frequency of sine and cosine outputs to a speed signal (not used in RVDT mode).
  - I.e. RPM (speed) of the motor can be applied here.

![RVDT simulation wiring: output voltage between Sin+ and Cos+ with Sin- and Cos- tied together, excitation voltage on EXC](/docs/assets/resolver-simulation/images/ressi-rvdt-wiring.jpg)

## Pin out

The following table shows the pin out of the front connector.

| Pin | Description |
| --- | --- |
| 0 | SYNC + |
| 1 | SYNC - |
| 2 | Sine OUT - |
| 3 | Sine OUT + |
| 4 | - |
| 5 | Cosine OUT - |
| 6 | Cosine OUT + |
| 7 | - |
| 8 | Excitation reference IN - |
| 9 | Excitation reference IN + |

*Table 4: Pin out front connector*

![Front connector of the resolver simulator module](/docs/assets/resolver-simulation/images/ressi-front-connector.jpg)

An input sine wave will be modulated depending on the requested sense of rotation and motor speed. The modulated signals will be output as a damped sine wave and a damped (and phase shifted) cosine wave. The attenuation can be configured by software.

It is also possible to set a static rotor angle.

Furthermore a synchronization input is available which can be used to measure an external frequency for example.

## Technical data

| Signal | Item | Min | Typical | Max | Unit |
| --- | --- | --- | --- | --- | --- |
| Supply voltage | Supply voltage (provided by cRIO chassis, no external voltage required) | 4,5 | | 5,5 | V |
| Supply voltage | Power consumption (provided by cRIO chassis) | | 50 | | mA |
| Excitation reference input | Excitation reference voltage range | | | 20 | V<sub>pp</sub> |
| Excitation reference input | Excitation reference input resistance (@10 kHz, inductive) | | 2000 | | Ohm |
| Excitation reference input | Excitation reference input frequency | 2 | 10 | 20 | kHz |
| SYNC input | SYNC input voltage range (peak voltage) | 5 | | 50 | V<sub>peak</sub> |
| SYNC input | SYNC input detection threshold | | 3 | | V |
| SYNC input | SYNC input frequency | 1 | | 200 | Hz |
| SYNC input | SYNC input current (U > 3V ) | 2 | | 7 | mA |
| Sine / Cosine output | Sine/ Cosine Output level (depends on software settings) | 0 | | 20 | V<sub>pp</sub> |
| Sine / Cosine output | Output resistance (@2,5 … 10 kHz ) | 5 | 7 | 20 | Ohm |

*Table 5: Technical data*

## Example waveforms (Resolver)

The next screenshots illustrate the functionality (channel 1: excitation, channel 2: sine output, channel 3: cosine output).

<figure>
  <img src="/docs/assets/resolver-simulation/images/ressi-wave-10000rpm.png" alt="Oscilloscope capture at 10000 rpm">
  <figcaption>Figure 6: Input and output signals at 10000 rpm</figcaption>
</figure>

<figure>
  <img src="/docs/assets/resolver-simulation/images/ressi-wave-4000rpm.png" alt="Oscilloscope capture at 4000 rpm">
  <figcaption>Figure 7: Input and output signals at 4000 rpm</figcaption>
</figure>

<figure>
  <img src="/docs/assets/resolver-simulation/images/ressi-wave-1000rpm.png" alt="Oscilloscope capture at 1000 rpm">
  <figcaption>Figure 8: Input and output signals at 1000 rpm</figcaption>
</figure>

<figure>
  <img src="/docs/assets/resolver-simulation/images/ressi-wave-switching-point.png" alt="Oscilloscope capture showing the switching point in detail">
  <figcaption>Figure 9: Details on switching point</figcaption>
</figure>

## Example waveforms (RVDT)

The next screenshots illustrate the functionality (channel 3: excitation; channel M: differential output signal; max. angle (setup): 30°).

<figure>
  <img src="/docs/assets/resolver-simulation/images/ressi-rvdt-0deg.png" alt="Oscilloscope capture: RVDT excitation and differential output at 0 degrees">
  <figcaption>Figure 10: RVDT input and differential output signal at 0°</figcaption>
</figure>

<figure>
  <img src="/docs/assets/resolver-simulation/images/ressi-rvdt-plus30deg.png" alt="Oscilloscope capture: RVDT excitation and differential output at +30 degrees">
  <figcaption>Figure 11: RVDT input and differential output signal at +30° (max.)</figcaption>
</figure>

<figure>
  <img src="/docs/assets/resolver-simulation/images/ressi-rvdt-minus15deg.png" alt="Oscilloscope capture: RVDT excitation and differential output at -15 degrees">
  <figcaption>Figure 12: RVDT input and differential output signal at -15°</figcaption>
</figure>