02. Configured

This is usually driven by the maximum torque and package requirements.

To suit DC bus range and inverter current limits, and efficiency demands.

Magnet, stator and wire specifications, ranging from five for ultimate performance, to one for minimum cost.

• Helix inverters support communication via controller area network (CAN) bus according to ISO 11898. Helix implements the Classical CAN frame format allowing bit rates up to 1 Mbit/s and payloads up to 8 byte per frame. The interface definition is defined in a DBC file shared with the customer in order to define and agree the necessary interfaces to the inverter
• Safety critical messages on the CAN are protected with end-to-end counters and checksums
• Helix has well-defined interfaces to support all aspects of inverter operation: torque control, speed control, fault and status reporting, for example. However, the customer can request CAN DBC modifications to facilitate the introduction of specific features and functions within the inverter control software

• Helix offers customisation of its core inverter platforms to achieve package integration better matched to customer requirements. Examples include:
  • Phase cable orientation
  • Cooling ports
  • DC in position and sizes

• Helix can map an inverter to a customer motor. The process involves a combination of desktop mapping based on modelling the motor characteristics and a final dyno optimisation to ensure best-in-class torque accuracy optimisation. Application optimisation may also be required to suit the client resolver.

• MCUSS is a high integrity, independent safety processor providing safety rated torque monitoring, safe state implementation and avoidance of hazardous DC voltage conditions after a crash. It features an independent processor and sensing hardware to guarantee freedom from interference. Primary MCUSS functions are:
• Monitoring (and reporting) delivered motor torque
• Ensuring that safe-state is achieved and maintained in the event of a safety related shutdown
• Preventing exposure to hazardous levels of DC voltage after a crash.

The safety system has been developed as a System Element Out Of Context (SeooC). Helix can provide a detailed safety manual and support customers with the testing required to bring the MCUSS into the vehicle context.