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An AC drive is a frequency converter designed to control the speed and torque of an electric motor, typically 3-phase AC induction or 3-phase BLDC motors, using specifically developed control methods such as variable-frequency drive (VFD) or field-oriented control (FOC).

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    • A variable frequency drive (VFD) consists of three main elements: an AC motor (usually a 3-phase induction motor), a drive controller and a user interface.

    • The AC motor

      The AC induction motor often has a fixed speed so that the controller is relatively simple. This supplies voltage in three phases in a sequence into the coils of a stator in the motor, creating a rotating magnetic field. This induces an electric field to drive the rotor.

    • The AC drive controller

      A typical industrial AC drive controller has three half-bridges, each delivering a sine-wave voltage to the stator. For the adjustable frequency, scalar algorithms are used in the controllers to vary the voltage to determine the frequency of the phases, or volts/hertz. The use of more sophisticated algorithms is becoming increasingly popular in high-end motors. Examples include vector control or field-oriented control (FOC) that are used to control the frequency of multiple phases.

      Adding in variable speed drives increases the complexity of the control algorithms.

      These drives also need the controller to provide a soft-start capability to reduce the load on the motor and the current surge of the motor during start-up. This is essential to reduce the stress on the motor and provide the maximum lifetime for the industrial drive on the factory floor.

      This is because the motors can have inrush currents seven to ten times that of the operational current, and the required torque can be three times higher at the start compared to when in operation. A digital soft-starter controller continuously monitors the voltage during start-up, adjusting to the load of the motor to provide smooth acceleration, speed and torque control. This is used to start and stop the AC motor drive system, reducing the stress on the drive. This also puts less load on the power supply, reducing the energy consumption and leading to significant cost savings.

    • The AC drive interface

      The interface to the AC drive can be via a number of different connections. These can vary from a 4 to 20 mA current loop, a 0 to 10 VDC voltage signal or a remote connection via Ethernet or a wireless communication link.

    • The advent of powerful semiconductor controllers has enabled a new class of industrial drives to be developed around AC electric motors, specifically using a variable-frequency drive (VFD). This has allowed many applications that previously required a DC motor with pulse width modulation for the accuracy to use more power-efficient three-phase AC induction motors instead. These can deliver significant energy savings across an industry, especially when combined with wireless sensing and control links as part of the Industrial Internet of Things (IIoT) delivers significant cost savings across the factory floor, while boosting productivity.

      Industrial AC drives are seen across the factory floor, from powering a fan or a hydraulic pump to a stepper motor controlling a pick and place head or a robotic arm requiring fine control. The load demands of roll-to-roll manufacturing systems, whether that is web-offset printing or thin film panels of all descriptions need careful speed control, and industrial drives are key to ensuring that the speed of all the rollers is closely aligned, requiring both high speed and high accuracy.

    • Application examples

      • Pick-and-place machines require both speed, accuracy and positioning. The faster a placement head can move to the exact location within a fraction of a millimeter, the quicker an entire printed circuit board or piece of equipment can be produced.

      • conveyor belt

        High-torque applications such as conveyor belts need to be able to handle heavy loads and light loads within a short time, requiring fine torque control to be efficient and effective. These also need to be highly reliable, as a conveyor shutting down hits the productivity of the entire factory.

      • All these applications can be addressed with the latest AC industrial drive technology. The AC induction motors are more reliable and energy efficient than the DC versions, and the latest semiconductor devices provide the levels of control that are required in industrial applications.

    • Linking industrial drives to the cloud opens up a world of opportunities as part of the industrial IoT and Industry 4.0. Remote control and monitoring of the drives with predictive maintenance algorithms ensures that preventive maintenance can be carried out to avoid any stoppages before they occur. All of this delivers significant cost savings across the factory floor, while boosting productivity.

Block diagram

Part Number
Description
STEVAL-IHM036V1 Low power motor control board featuring the SLLIMM™ STGIPN3H60 and MCU STM32F100C6T6B Quick view

Key Features

  • Complete 100 W power inverter solution
  • HV supply: 90 to 285 V AC or direct DC at 125 to 400 V DC
  • Input inrush limiter based on NTC resistor
  • Single shunt resistor current-sensing method
  • Overtemperature and overcurrent hardware protection
  • Compact and safe design
  • Test points available to allow further evaluation
  • RoHS compliant

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Schematics BOM Gerber
EVALSTDRIVE601 EVALSTRIVE601 Quick view

Key Features

  • High voltage rail up to 600V
  • Driver supply input voltage range 9V-20V
  • STGD6M65DF2 IGBTs power stage featuring:
    • V(BR)CES = 650 V
    • VCE(sat) = 1.55 V @ IC = 6 A
  • Dual footprint for IGBT/MOSFET package:
    • DPAK
    • PowerFlat 8x8
  • Selectable single or 3-shunt current sensing topology:
    • Sensored or sensorless BEMF detection
    • FOC or 6-Step algorithm
  • SmartShutdown overcurrent protection
  • Hall effect sensors connector
  • Bus voltage sensing
  • 450V bulk capacitor
  • Connector for interfacing with MCU
  • RoHS compliant

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STEVAL-IHM035V2 3-phase high voltage inverter power board for FOC and scalar motor control based on the STGIPN3H60 (SLLIMM™-nano) Quick view

Key Features

  • Nominal power: up to 100 W
  • Compatible with 3.3 V and 5 V control board
  • Single shunt resistor for current reading
  • On-board temperature sensor
  • Overcurrent protection with boost/disabling capability
  • For six-step drives:
    • Current limitation/regulation network
    • BEMF detection network
  • MC connector
  • Compatible with sinusoidal and trapezoidal control
  • RoHS compliant

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Schematics BOM Gerber
STEVAL-IHM045V1 3-phase high voltage inverter power board for FOC based on the STGIPN3H60A (SLLIMM™-nano) Quick view

Key Features

  • Wide-range input voltage (30-270 Vac)
  • Maximum power up to 100 W at 230 Vac input
  • Based on the STGIPN3H60A SLLIMM™-nano AC motor drive
  • Mounts the VIPer06 fixed frequency offline converter from the VIPer™ plus family
  • Efficient DC-DC power supply (15 V, 3.3 V)
  • DC bus voltage power supply connectors
  • External 15 V input
  • Dedicated connector for interfacing with the various other ST evaluation boards
  • Suitable for sinusoidal FOC drives
  • Selectable single or three-shunt current reading topology with fast operational amplifier
  • Configurable for direct motor current sampling from shunt resistors
  • Hardware overcurrent detecting network
  • Temperature sensor
  • Hall sensor/quadrature encoder inputs
  • RoHS compliant

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Schematics BOM Gerber
STEVAL-IHM023V3 1 kW 3-phase motor control evaluation board featuring L6390 drivers and STGP10H60DF IGBT Quick view

Key Features

  • Minimum input voltage: 125 VDC or 90 VAC
  • Maximum input voltage: 400 VDC or 285 VAC
  • Input voltage range with applied input voltage doubler from 65 VAC to 145 VAC
  • Voltage range for low-voltage motor control applications from 18 VDC to 35 VDC
  • Possibility to use auxiliary +15 V supply voltage
  • Maximum output power for motors: up to 1 kW
  • Regenerative brake control
  • Input inrush limitation with bypass relay
  • + 15 V auxiliary power supply based on buck converter with VIPer16
  • IGBT power switch STGP10H60DF in a TO- 220 package - compatible with other ST IGBTs or power MOSFETs in the TO-220 package
  • Fully populated board design with test points and isolated plastic cover for safety
  • Motor control connector for interface with the STM3210B-EVAL board and other ST motor control dedicated kits
  • Tachometer input
  • Hall/encoder inputs
  • Possibility to connect BEMF daughterboard for sensorless six-step control of BLDC motors
  • PCB type and size:
    • PCB material: FR-4
    • Double-sided layout
    • Copper thickness: 60 μm
    • Total dimensions of board: 127 mm x 180 mm
  • RoHS compliant

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FEATURED RESOURCES

Schematics BOM Gerber
EVAL6491HB Demonstration board for L6491 gate driver with smart shut down feature Quick view

Key Features

  • High voltage rail up to 600 V
  • dV/dt immunity: 50 V/ns in full temperature range
  • Driver current capability: 4 A source/sink
  • Comparator for fault protections
  • Smart shutdown function
  • Integrated bootstrap diode
  • Adjustable deadtime
  • Interlocking function
  • Switching times 15 ns rise/fall with 1 nF load
  • 3.3 V, 5 V TTL/CMOS inputs with hysteresis
  • Compact and simplified layout
  • Bill of material reduction
  • Effective fault protection
  • Flexible, easy and fast design

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Schematics BOM Gerber
STEVAL-IPM05F 500 W motor control power board based on STGIF5CH60TS-L SLLIMM™ 2nd series IPM Quick view

Key Features

  • Input voltage: 125 - 400 VDC
  • Nominal power: up to 500 W
  • Nominal current: up to 3.0 A
  • Input auxiliary voltage: up to 20 V DC
  • Single or three-shunt resistors for current sensing (with sensing network)
  • Two options for current sensing: dedicated op-amps or through MCU
  • Overcurrent hardware protection
  • IPM temperature monitoring and protection
  • Hall sensor or encoder input
  • Uses the STGIF5CH60TS-L IGBT intelligent power module from the 2nd series of SLLIMM™ IPMs
  • 32-pin motor control connector for interfacing with ST MCU boards
  • Universal conception for further evaluation with breadboard and testing pins
  • Very compact size
  • RoHS compliant

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FEATURED RESOURCES

Schematics BOM Gerber
EVALSTDRV600HB8 Demonstration board kit for L638xE and L639x high-voltage gate drivers Quick view

Key Features

  • Half-bridge configuration
  • High voltage rail up to 600 V
  • Includes samples of each compatible gate driver in SO8 package
    • L6385E, L6387E, L6388E, L6389E,
    • L6395, L6398, L6399
  • Compatible with MOSFETs/IGBTs in
    • DPAK, D2PAK, TO-220, TO-220FP
  • dV/dt transient immunity ± 50 V/ns in full temperature range
  • Integrated bootstrap diode
  • Dedicated high- and low-side driving inputs
  • Compact and simplified layout
  • Gate drivers in the kit features different functionalities and characteristics
    • UVLO on both - high-side and low-side
    • Internal deadtime, or no deadtime
    • Interlocking for anti cross-conduction protection
    • Ability to drive asymmetrical half-bridges and switched reluctance motors
    • Active high or active low LIN for single input gate driving

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FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-IHM040V1 BLDC/PMSM driver demonstration board based on STM32 and the SLLIMM nano™ Quick view

Key Features

  • Extended AC input mains range: 115 or 230 VAC nominal at 50/60 Hz, or DC input voltage between 150 and 350 VDC
  • Output current: 0.5 ARMS to the motor
  • Power stage: 3-phase inverter bridge implemented using the STGIPN3H60 SLLIMM-nano intelligent power module
  • RoHS compliant

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FEATURED RESOURCES

Schematics BOM
Part Number
STEVAL-IHM036V1

Low power motor control board featuring the SLLIMM™ STGIPN3H60 and MCU STM32F100C6T6B

Key Features

  • Complete 100 W power inverter solution
  • HV supply: 90 to 285 V AC or direct DC at 125 to 400 V DC
  • Input inrush limiter based on NTC resistor
  • Single shunt resistor current-sensing method
  • Overtemperature and overcurrent hardware protection
  • Compact and safe design
  • Test points available to allow further evaluation
  • RoHS compliant

Show More

IMAGE

Image
Image

FEATURED RESOURCES

Schematics BOM Gerber

Key Features

  • High voltage rail up to 600V
  • Driver supply input voltage range 9V-20V
  • STGD6M65DF2 IGBTs power stage featuring:
    • V(BR)CES = 650 V
    • VCE(sat) = 1.55 V @ IC = 6 A
  • Dual footprint for IGBT/MOSFET package:
    • DPAK
    • PowerFlat 8x8
  • Selectable single or 3-shunt current sensing topology:
    • Sensored or sensorless BEMF detection
    • FOC or 6-Step algorithm
  • SmartShutdown overcurrent protection
  • Hall effect sensors connector
  • Bus voltage sensing
  • 450V bulk capacitor
  • Connector for interfacing with MCU
  • RoHS compliant

Show More

IMAGE

Image
Image
STEVAL-IHM035V2

3-phase high voltage inverter power board for FOC and scalar motor control based on the STGIPN3H60 (SLLIMM™-nano)

Key Features

  • Nominal power: up to 100 W
  • Compatible with 3.3 V and 5 V control board
  • Single shunt resistor for current reading
  • On-board temperature sensor
  • Overcurrent protection with boost/disabling capability
  • For six-step drives:
    • Current limitation/regulation network
    • BEMF detection network
  • MC connector
  • Compatible with sinusoidal and trapezoidal control
  • RoHS compliant

Show More

IMAGE

Image
Image

FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-IHM045V1

3-phase high voltage inverter power board for FOC based on the STGIPN3H60A (SLLIMM™-nano)

Key Features

  • Wide-range input voltage (30-270 Vac)
  • Maximum power up to 100 W at 230 Vac input
  • Based on the STGIPN3H60A SLLIMM™-nano AC motor drive
  • Mounts the VIPer06 fixed frequency offline converter from the VIPer™ plus family
  • Efficient DC-DC power supply (15 V, 3.3 V)
  • DC bus voltage power supply connectors
  • External 15 V input
  • Dedicated connector for interfacing with the various other ST evaluation boards
  • Suitable for sinusoidal FOC drives
  • Selectable single or three-shunt current reading topology with fast operational amplifier
  • Configurable for direct motor current sampling from shunt resistors
  • Hardware overcurrent detecting network
  • Temperature sensor
  • Hall sensor/quadrature encoder inputs
  • RoHS compliant

Show More

IMAGE

Image
Image

FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-IHM023V3

1 kW 3-phase motor control evaluation board featuring L6390 drivers and STGP10H60DF IGBT

Key Features

  • Minimum input voltage: 125 VDC or 90 VAC
  • Maximum input voltage: 400 VDC or 285 VAC
  • Input voltage range with applied input voltage doubler from 65 VAC to 145 VAC
  • Voltage range for low-voltage motor control applications from 18 VDC to 35 VDC
  • Possibility to use auxiliary +15 V supply voltage
  • Maximum output power for motors: up to 1 kW
  • Regenerative brake control
  • Input inrush limitation with bypass relay
  • + 15 V auxiliary power supply based on buck converter with VIPer16
  • IGBT power switch STGP10H60DF in a TO- 220 package - compatible with other ST IGBTs or power MOSFETs in the TO-220 package
  • Fully populated board design with test points and isolated plastic cover for safety
  • Motor control connector for interface with the STM3210B-EVAL board and other ST motor control dedicated kits
  • Tachometer input
  • Hall/encoder inputs
  • Possibility to connect BEMF daughterboard for sensorless six-step control of BLDC motors
  • PCB type and size:
    • PCB material: FR-4
    • Double-sided layout
    • Copper thickness: 60 μm
    • Total dimensions of board: 127 mm x 180 mm
  • RoHS compliant

Show More

IMAGE

Image
Image

FEATURED RESOURCES

Schematics BOM Gerber
EVAL6491HB

Demonstration board for L6491 gate driver with smart shut down feature

Key Features

  • High voltage rail up to 600 V
  • dV/dt immunity: 50 V/ns in full temperature range
  • Driver current capability: 4 A source/sink
  • Comparator for fault protections
  • Smart shutdown function
  • Integrated bootstrap diode
  • Adjustable deadtime
  • Interlocking function
  • Switching times 15 ns rise/fall with 1 nF load
  • 3.3 V, 5 V TTL/CMOS inputs with hysteresis
  • Compact and simplified layout
  • Bill of material reduction
  • Effective fault protection
  • Flexible, easy and fast design

Show More

IMAGE

Image
Image

FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-IPM05F

500 W motor control power board based on STGIF5CH60TS-L SLLIMM™ 2nd series IPM

Key Features

  • Input voltage: 125 - 400 VDC
  • Nominal power: up to 500 W
  • Nominal current: up to 3.0 A
  • Input auxiliary voltage: up to 20 V DC
  • Single or three-shunt resistors for current sensing (with sensing network)
  • Two options for current sensing: dedicated op-amps or through MCU
  • Overcurrent hardware protection
  • IPM temperature monitoring and protection
  • Hall sensor or encoder input
  • Uses the STGIF5CH60TS-L IGBT intelligent power module from the 2nd series of SLLIMM™ IPMs
  • 32-pin motor control connector for interfacing with ST MCU boards
  • Universal conception for further evaluation with breadboard and testing pins
  • Very compact size
  • RoHS compliant

Show More

IMAGE

Image
Image

FEATURED RESOURCES

Schematics BOM Gerber
EVALSTDRV600HB8

Demonstration board kit for L638xE and L639x high-voltage gate drivers

Key Features

  • Half-bridge configuration
  • High voltage rail up to 600 V
  • Includes samples of each compatible gate driver in SO8 package
    • L6385E, L6387E, L6388E, L6389E,
    • L6395, L6398, L6399
  • Compatible with MOSFETs/IGBTs in
    • DPAK, D2PAK, TO-220, TO-220FP
  • dV/dt transient immunity ± 50 V/ns in full temperature range
  • Integrated bootstrap diode
  • Dedicated high- and low-side driving inputs
  • Compact and simplified layout
  • Gate drivers in the kit features different functionalities and characteristics
    • UVLO on both - high-side and low-side
    • Internal deadtime, or no deadtime
    • Interlocking for anti cross-conduction protection
    • Ability to drive asymmetrical half-bridges and switched reluctance motors
    • Active high or active low LIN for single input gate driving

Show More

FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-IHM040V1

BLDC/PMSM driver demonstration board based on STM32 and the SLLIMM nano™

Key Features

  • Extended AC input mains range: 115 or 230 VAC nominal at 50/60 Hz, or DC input voltage between 150 and 350 VDC
  • Output current: 0.5 ARMS to the motor
  • Power stage: 3-phase inverter bridge implemented using the STGIPN3H60 SLLIMM-nano intelligent power module
  • RoHS compliant

Show More

IMAGE

Image
Image

FEATURED RESOURCES

Schematics BOM
00 Files selected for download

Presentations & Training Material

    • Description Version Size Action
      An introduction to electric motors 1.0
      2.23 MB
      PDF

      An introduction to electric motors

Publications and Collaterals

    • Description Version Size Action
      SLLIMM™ 2nd Series: Small Low-Loss Intelligent Molded Modules 1.0
      1.14 MB
      PDF

      SLLIMM™ 2nd Series: Small Low-Loss Intelligent Molded Modules

    • Description Version Size Action
      Motor Control Reference Guide 15.10
      2.61 MB
      PDF

      Motor Control Reference Guide

Development Tools

    • Part Number

      MOSFET product finder application for Android and iOS

      Protection product finder application for Android and iOS

      Thyristor product finder application for Android and iOS

      Diode product finder application for Android and iOS

      IGBT product finder application for Android and iOS

      Operational amplifier and comparator application for smartphones and tablets

      Linear and switching voltage regulators and voltage reference applications for smartphones and tablets

      VIPower smart product finder application for Android and iOS

Embedded Software

    • Part Number

      ST PowerStudio dynamic electrothermal simulation software for power devices

eDesignSuite

Converter

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output Power

V This option is required and must be a number.
A This option is required and must be a number.