Direct Current (DC) Drives Market Size, Share & Industry Analysis, By Voltage Rating (Up to 240 V, 240 - 600 V, and 600 V & Above), By Power Rating (Up to 250 kW, 251 - 500 kW, and 500 kW & Above), By End User (Oil & Gas, Power Generation, Food & Beverage, Chemicals & Petrochemicals, Metal & Mining, Water & Wastewater, Building Automation, and Others), and Regional Forecast, 2019-2026