The PADT MMC

The PADT Modular Motor Controller (MMC) is a 3-phase brushless DC motor controller system that has been designed to provide a wide range of flexible motor control options over an extensive voltage range.

Specifications
Weight	1.7 lbm
Width	6.0"
Length	7.5"
Height	1.76"
Enclosure Material	Anodized Aluminum Sheet
Mounting Plate Material	Anodized Aluminum Plate
Voltage Range	8 V to 400 V
Max. Current	25 A
Max. Power	2 kW
Max. PWM Frequency	39 kHz

The MMC employs trapezoidal phase commutation, operates from 8 to 400 Volts DC, sustains up to 25 Amps current, and provides closed loop control from many input options. This makes the MMC well suited to control fuel cell ancillaries, and provides flexibility as the industry explores the wide array of fluid handling architectures. To further expand usability, the engineered enclosure can also be sealed to allow for operation in extreme environments. In short, the MMC system, allows PADT to deliver custom controller solutions rapidly, and at an affordable price.

During the next year, the MMC controller family will be expanded to include more features that target the fuel cell industry. These features include: sinusoidal commutation (leads to smaller cheaper motors), sensorless control (improves robustness), CAN capability, and a second inverter option capable of delivering 100 Amps.

Feature	Benefit
Modular design	The boards within the MMC separate inverter, control, DC-DC conversion, commutation, and command input functions. As such, the unit can be configured to deal with a wide range of specifications.
Wide voltage input range	System is configurable to operate from 8 to 400 VDC.
Large power range	With adequate heat dissipation, the controller can deliver up to 2 kW.
Wide range of speed control options	0–10 V, loop powered 4–20 mA, or PWM input signals can be used to control speed. CAN enabled system is in development.
Customizable	The MMC uses a 10 MIPS microcontroller to implement a control algorithm that can consider motor parameters including speed, current, power, temperature, and run time.
Current limiting	The MMC has both instantaneous and average current limiting.

For more information, please contact Mark Johnson or Scott Klopfenstein at PADT. For additional information on PADT’s fuel cell accessory products, please click on any of the links below.