Description

The Resolver In functionality of the OPAL-RT Board driver provides the simulation the possibility of receiving resolver signals through the analog input channels of the OP5340 modules installed in the simulator. 
In the case of the OP4200 chassis, the OP5340 module is incorporated into the I/O cassette with ID OP4240-1. 

The functionality is based on the basic two-pole resolver. There are two resolvers implemented in each subgroup of 8 analog in channels. 
The Resolver In has two operation modes: the standard one, where configuration parameters are applied before the simulation's start and the calibration mode, where the parameters are updated through connection points at run-time.

The values always provided back to the simulation through connection points for each resolver are the Speed and Angle retrieved from the resolved signals.

If the resolver is in calibration mode, the following connection points are also made available:

The connection points above (apart from the last 3) are used to tune the parameters required by the Resolver In functionality during execution. When the resolver is not in calibration mode (i.e. it is in standard operation mode), then the parameters are configurable through the interface's UI and are sent to the FPGA once, at the beginning of the simulation. For a detailed description of what each parameter does, please check the Usage section below. 
The last 3 connection points are inputs to the model and they represent the waves that were used to resolve the received signals (the carrier, sine and cosine waves).

Usage

Once the bitstream configuration file has been parsed, the location of the analog input modules becomes visible to the user. The channels of the modules are grouped into bunches of 8. By clicking on each group of 8, the user has access to the configurable options of the group.

Channel group configuration

The two resolvers present in the current channel group are split into two sections: ResolverIn 1 and ResolverIn 2. The parameters described below are the same for both resolvers. Their description also applies to the additional connection points created when the Calibration mode box is checked.

Signals configuration

Channels in resolver input groups do not have any parameters to configure.
The table below shows how the resolver inputs translate to the physical channels of the analog input module.

The channel setup described above is the most common. There can, however, be changes to it, depending on how the bitstream was designed (i.e. using different analog input channels than the ones detailed above). In that case, special attention should be paid to how the external equipment is connected to the analog input module(s) of the simulator, so that the carrier, sine and cosine waves are processed appropriately by the Resolver In functionality.

In most bitstreams containing resolvers provided by Opal-RT, both the input and the output functionalities are present. Therefore, in most cases, the generated carrier wave for the first Resolver In of a subgroup is the fourth analog output channel (channel 3 or 11, depending on the subgroup); for the second Resolver In, it is the eighth analog output channel (channel 7 or 15, depending on the subgroup).

If there are any doubts about how the signals are routed, please consult the RT-XSG model used to generate the programmable bitstream file. If the model is not available, please contact Opal-RT support.

Characteristics and Limitations

For the connector pin assignments, the user should refer to the carrier documentation.

The current version of the resolver analog input functionality of the OPAL-RT Board driver has the following limitations:

• The detectable speed is in the range of -5300 Hz to 5300 Hz