BLDC motor drive: choosing the components
A three-phase BLDC motor drive needs six functional blocks: a control MCU, rotor position sensing, phase current sensing, gate drive, a power switching stage, and a bias and protection supply. This guide shows which J.P. Electronics manufacturer lines serve each block, and the design questions that decide each choice.
Which of our lines serves each block?
| Block | Our lines | What decides the choice |
|---|---|---|
| Control MCU | Microchip Geehy Megawin NXP | Field-oriented control or six-step, ADC performance, safety requirements |
| Rotor position sensing | Allegro MicroSystems | Sensored or sensorless, startup torque, accuracy |
| Phase current sensing | Allegro MicroSystems Novosense | Isolation requirement, bandwidth, current level |
| Gate drive | Allegro MicroSystems Novosense Geehy | Isolation rating, switching speed, protection features |
| Power stage | Taiwan Semiconductor Good Ark Viitor Navitas | Bus voltage, switching frequency, thermal budget |
| Bias & protection | Chipown On-Bright Bel | Isolated rails, surge class, standby power |
| Passives, timing & display | CCTC RDM Technology AV Display Yeebo | Ripple current, derating, HMI requirement |
How do I choose a current sensor for field-oriented control?
Field-oriented control samples phase current inside the PWM window, so the sensor’s bandwidth and delay matter more than its headline accuracy. At higher currents, or wherever the control ground is not the power ground, an isolated or coreless sensor removes the shunt’s dissipation and the level-shifting problem.
What changes at higher bus voltages?
Isolation stops being optional. Gate drive, current sensing and the bias supply all cross an isolation barrier, creepage and clearance start driving the layout, and the switch choice between silicon, SiC and GaN becomes a thermal and cost question rather than an electrical one.
Working on a bldc motor drive design?
Email your specification and we will map it to the right families across our lines, with samples for the ones you shortlist.