Single phase driveInvention House offers two lines of single phase (SPD) AC motor drives: our own OEM drives and the Invertek E3 Optidrive.

Invention House Drives

Designed primarily for OEM environments. We offer a variety of drive models (shown below). All are single-board, variable frequency motor drives for harsh environments. Single-phase input, single-phase output. -40 to +60C ambient operation. 40G shock, 2Grms vibration tolerant. 


  • Harsh environment single-phase motor drive (blowers, fans, pumps etc.)
  • Military grade power conversion – 50/60/400Hz in, 400Hz out
  • Linear Motors for vibratory feeders, shakers, and compressors
  • Transformer drive, including resonant transformers
  • Boiler combustion fan drive


  • Single-phase Input
  • Single-phase Output
  • 4A and 10A Models
  • -40 to +60C Operating

  • 120V/230V Models
  • 400Hz Output Option
  • Open Frame or with Case
  • 40G Shock, 2Grms Vibration

  • 1 Digital Output, 4 Digital Inputs
  • 1 High Voltage Relay
  • Tilt Protection Option

Invention House Single Phase Drive Models

Input Voltage Range
Max Output Current
Output Frequency Range
SPD-500 90-132 4A 5-90Hz General Purpose  Yes
SPD-500D 90-160 4A 5-90Hz Military Grade  Proprietary
SPD-400 90-132 4A 400Hz Military Grade  Yes
SPD-500C 90-132 4A 35-70Hz Independent V and Hz Yes
SPD-2230A 90-250 10A 5-400Hz General Purpose Yes
SPD-2230B 90-250 10A Up to 25kHz Specialty Drive (linear motors, resonant XFMR...) Yes

Download Brochures:

IH Cutsheet SPD-2230,  IH Cutsheet SPD-500,  



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Invertek Optidrive E3 SPD

Invertek custom single phase drivesDesigned to be cost effective and easy to use, the Optidrive E3 for Single Phase Motors is for use with PSC (Permanent Split Capacitor) or Shaded-Pole Single Phase induction motors. Optidrive E3 for Single Phase Motors uses a revolutionary motor control strategy to achieve reliable intelligent starting of single phase motors. Visit our Invertek page to see the full line of Invertek single-phase and 3-phase drives.

Key Invertek E3 Features

  • 110 – 115V and 200 – 240V models
  • Small mechanical envelope
  • Rugged industrial operation
  • Fast setup, and simple operation with 14 basic parameters
  • Unique motor control strategy optimised for single phase motors

  • Motor current and rpm indication
  • Built in PI control, EMC filter (C1) & brake chopper
  • Application macros for industrial, fan and pump operation
  • Bluetooth connectivity

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