--- title: Blog | Typhoon HIL | variable speed drives description: variable speed drives | Typhoon HIL Blog for microgrids, smart inverters, and power electronics using hardware in the loop simulation testing. image: https://info.typhoon-hil.com/hubfs/Blog_Images/TyphoonHILBlog.png --- [![logo-white](https://info.typhoon-hil.com/hubfs/Logo_White_02.svg) Typhoon HIL](https://info.typhoon-hil.com/blog) - Menu Item 1 - Sub-menu Item 1 - Another Item - Sub-menu Item 2 - Menu Item 2 - Yet Another Item - Menu Item 3 - Menu Item 4 # Typhoon HIL Blog --- ## [Success Story: Induction Motor Drive for Mining Automation with Indrivetec AG](https://info.typhoon-hil.com/blog/hil-tested-case-study-induction-motor-drive-for-mining-automation-with-indrivetec-ag) Posted by [Debora Santo and Sergio Costa](https://info.typhoon-hil.com/blog/author/debora-santo-and-sergio-costa) on Jun 24, 2020 3:25:24 PM Topics: [C-HIL](https://info.typhoon-hil.com/blog/topic/c-hil), [HIL](https://info.typhoon-hil.com/blog/topic/hil), [DER](https://info.typhoon-hil.com/blog/topic/der), [power electronics design](https://info.typhoon-hil.com/blog/topic/power-electronics-design), [HIL simulation](https://info.typhoon-hil.com/blog/topic/hil-simulation), [variable speed drives](https://info.typhoon-hil.com/blog/topic/variable-speed-drives) - [Tweet](https://twitter.com/share) ![Hero Fig 1 - DFIM Motor Drive for Mining SAG Mill](https://info.typhoon-hil.com/hs-fs/hubfs/Hero%20Fig%201%20-%20DFIM%20Motor%20Drive%20for%20Mining%20SAG%20Mill.jpg?width=1920&name=Hero%20Fig%201%20-%20DFIM%20Motor%20Drive%20for%20Mining%20SAG%20Mill.jpg)   The case study featured here is a 3 MW doubly fed induction motor (DFIM) drive used for mining applications. The DFIM drive controls were designed, built, and tested by [Indrivetec AG](https://www.indrivetec.ch/en_US/), at the request of [CSE-Uniserve](https://www.cse-uniserve.com.au/). Indrivetec AG is a Zurich-based power electronics, drives, and energy storage company and is an early adopter of Hardware-in-the-Loop (HIL) technology with a research lab primarily based on HIL for control design and testing. The stator of this motor is connected to the medium voltage grid, and the rotor is connected to a liquid resistor of the system integrator CSE-Uniserve and an Indrivetec Insulated-gate bipolar transistor (IGBT) converter. Here, the resistor is used for starting and running at a constant speed, while the converter is used for variable speed operation. 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