MMP742038-24-C Monolithic Power Systems

MMP742038-24 Motor Control Board for Servo Motor Applications Requiring Speed/Position Control DESCRIPTION FEATURES The MMP742038-24 is part of a family of smart 18V to 36V Input Voltage Range motor control boards for servo motor applications. Max 38W Continuous Power Output This design is capable of delivering 38W 0.3 Position Resolution continuous power, and is designed to fit NEMA 17 RS485 Interface and PULSE/DIR Interface format, 42mm motors. Position Control and Speed Control Operating Temperature: 0C to 70C (Power The board features: an embedded angular sensor Derated > 40C) FOC control selectable position, speed, and torque Storage Temperature: -40C to +125C loop mode and RS485 and PULSE/DIR input interfaces. Easy-to-use GUI software provides flexibility by ORDERING INFORMATION allowing users to optimize the design online through the RS485 control interface. The Part Number MMP742038-24-C parameters are saved in the control board s non- Diameter (mm) volatile memory. 42 Power (W) 38 Users can also order a complete motor Typical Voltage (V) 24 (MSM942038-24). A datasheet for the MSM942038-24 is available for download at Control Mode Speed/Position www.monolithicpower.com. Interface RS485, PULSE/DIR RECOMMENDED OPERATING CONDITIONS Input voltage ................................ 18V to 36V Control interface voltage ............... 0V to 5.5V Max pulse frequency ........................ 500kHz RS485 A/B voltage ....................... 0V to 5.5V RS485 common mode voltage ............. 15V Operation temperature ............... 0C to 70C Storage temperature ........... -40C to +125C Figure 1: Motor Control PCBA Motor Control Board Parameters Condition Value Units Input voltage 24 V 0C to Output power 38 W 40C Position resolution 0.3 MMP757188-36 r1.0 www.MonolithicPower.com 1 6/19/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2019 MPS. All Rights Reserved. MMP742038-24 MOTOR CONTROL PCB INSTALLATION OF PCB ASSEMBLY IN SMART MOTOR Figure 2: Smart Motor PCB Assembly The motor control PCB assembly can be installed into a motor (see Figure 2). Users can manufacture their own control board housing and magnet holder based on the actual motor dimensions. MPS will supply the magnet. Table 1 shows some examples of recommended magnets for use with the MMP module. A sintered NdFeB or SmCo magnet of a 6mm to 8mm diameter and 2.5mm to 3mm height with remanent field strength in the 1.0T to 1.2T range is recommended (see Figure 3). The diameter of the magnet depends on the specific motor shaft and holder design used. It is important that the magnetization is diametrically polarized. Figure 3: Magnet Height and Diameter The magnet air gap spacing to the sensor surface should be set to achieve a field strength between 30mT min and 80mT max (see Figure 4). The MPS magnetic simulation tool at