DRV10975RHFR

User's Guide SLOU395D – July 2014 – Revised June 2017 DRV10983 and DRV10975 Tuning Guide The DRV10983 and DRV10975 are three-phase sensorless motor drivers, featuring an I2C interface that allows the user to reprogram specific motor parameters in registers and burn them into the EEPROM to help optimize the performance for a given application. This document helps customers quickly set up the DRV10983 and DRV10975, enabling them to experience the devices' powerful performance and flexible programmability. Read Datasheet Watch Quick Start Video Install GUI Try I2C Communication Configure Closed Loop Current Limit, Lock Detect PWM Output, AVS and FG Options Enable Entering to Closed Loop Acquire Motor Parameters Motor Resistance BEMF Constant 1st Milestone Motor spinning in Open-loop 2nd Milestone Motor Speed Control in Closed Loop Connect Motor Power on Launch GUI Exercise Current Control and Protection Enable Configuration Set the Parameters Configure Startup Setting Disable Closed Loop Speed Control by GUI Fine Tune Start-up Setting Adjust Lead Angle to Optimize Efficiency Exercise Lock Detect and AVS Function Figure 1. Sequence of Events SLOU395D – July 2014 – Revised June 2017 Submit Documentation Feedback DRV10983 and DRV10975 Tuning Guide Copyright © 2014–2017, Texas Instruments Incorporated 1 Bench Set Up 1 www.ti.com Bench Set Up Before connecting your own motor, read the DRV10983 (SLVSCP6) or DRV10975 datasheet (SLVSCP2), DRV10983 and DRV10975 EVM user’s guide (SLOU393), and watch the quick start video. Also, install the GUI software on your computer, and make sure the I2C communication is working. If you have not done so, please refer to the Quick Start Guide (SLYU022). 2 Acquire Motor Parameter When a new project is started, the first step is to acquire the motor parameters (see Table 1). The motor parameters help determine whether it is suitable for the DRV10983 and DRV10975 and what the proper settings are for this motor. The following sections describe how to measure each parameter. Having a picture of the motor is also suggested to have an overview of the motor design. Table 1. Motor Parameter Table 2.1 ITEM NUMBER OPERATION VOLTAGE Motor1 Motor1 Motor1 Motor1 Motor1 Motor1 NUMBER OF POLES MAXIMUM SPEED (RPM) MAXIMUM CURRENT R (PHASE-CT) Kt (PHASEPHASE) LR CONSTANT INERTIA PICTURE Operation Voltage, Number of Poles, Maximum Speed, and Maximum Current These four parameters should be provided by the motor specification or the application specifications. 2.1.1 Operation Voltage Most of the time, operation voltage is fixed with less than 10% error. Some applications adjust motor speed by adjusting the operation voltage. In this condition, record the maximum operation voltage. 2 DRV10983 and DRV10975 Tuning Guide Copyright © 2014–2017, Texas Instruments Incorporated SLOU395D – July 2014 – Revised June 2017 Submit Documentation Feedback Acquire Motor Parameter www.ti.com 2.1.2 Number of Poles The number of poles means the number of poles of the permanent magnet. The number of pole pairs is the number of poles divided by two. N S S N S N N N N S S N N S S S S N 2 Poles 1 Pole Pair 4 Poles 2 Pole Pairs 12 Poles 6 Pole Pairs Figure 2. Pole Pairs in Permanent Magnets If the number of poles is not listed in the motor specification, measure it with the following method: 1. Use a lab power supply and inject current from phase U to phase V. Make sure the current amplitude is less than the motor rated current. x