Electric Tool BLDC Solution

Application

Description

High-performance BLDC motor control solution for cordless power tools with fast torque response, speed regulation, and battery management integration.

Core Advantages

Fast Response <1ms torque response provides excellent tool feel and control
High Speed Supports up to 30,000 RPM for high-speed grinding and cutting
Battery Protection Integrated battery monitoring and protection extends pack life
Compact Small QFN20 package fits in tight tool handle spaces

Recommended Bill of Materials (BOM)

Item Part Number Description Quantity Datasheet
1 LKS32MC033H6P8 Compact motor control MCU 1 📄 Download
2 LKS_GD_6N_1A5 6N gate driver 1 📄 Download
3 BSC014N04LS 40V MOSFET 6 📄 Download
4 LKS_PMIC_5V_500 5V LDO for MCU 1 📄 Download

Applications

Cordless drills
Angle grinders
Impact drivers
Circular saws
Garden tools

Technical Specifications

Topology
Three-phase inverter
Current Sensing
Single shunt
P W M Frequency
20kHz
Commutation
Sensorless BEMF detection
Start-up
Align and go
Protection
OCP, UVP, OTP
Efficiency
>90%

Customer Success Stories

Power Tool Manufacturer

Electric Tools | 20V Cordless Drill

Challenge

Develop high-performance brushless motor control for 20V cordless drill requiring fast torque response, compact size for handle integration, and battery protection.

Solution

Used LKS32MC033 in compact QFN20 package with sensorless six-step control. Implemented fast current loop for torque response. Added battery voltage monitoring and protection.

Results

Achieved <1ms torque response. Compact design fit in tool handle. Battery protection prevented over-discharge. Tool performance exceeded customer expectations. Passed drop test and environmental testing.

FAE Expert Insights

M

Michael Chen

FAE Engineer - Motor Control

12 years

Professional Insights

[Data Pending] FAE insights to be added based on actual application experience with this solution.

Key Takeaways

  • Use LKS03 for compact size
  • Implement fast current loop <1ms response
  • Use comparator BEMF for high-speed detection
  • Add comprehensive battery protection

Decision Framework

Decision Framework
Steps:
  1. Evaluate requirements
  2. Compare solutions
  3. Consult FAE

Ready to Implement This Solution?

Contact our FAE team for design support and quotes

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Frequently Asked Questions

What is the best commutation method for power tool motors?

Power tool BLDC commutation methods: (1) Six-step trapezoidal - simplest, good for most power tools, 85-90% efficiency

(2) Sinusoidal - smoother torque, lower noise, 90-93% efficiency, requires more processing

(3) FOC - best efficiency and torque control, 93-95%, highest processing requirements. For most power tools, six-step is adequate and provides fastest response. The efficiency difference is small for the intermittent use typical of power tools. FOC is beneficial for high-end tools requiring very smooth operation or battery life optimization. LKS32MC033 supports six-step with excellent performance. Upgrade to LKS05/LKS07 for sinusoidal or FOC if needed.

Use six-step for most power tools. Consider FOC for premium tools requiring maximum efficiency.

How do I implement battery protection for cordless tools?

Battery protection implementation: (1) Overvoltage protection - prevent charging above 4.2V/cell

(2) Undervoltage protection - stop discharge below 2.5-3.0V/cell to prevent damage

(3) Overcurrent protection - limit discharge current to battery rating

(4) Temperature protection - monitor battery temperature, stop operation if too hot or cold

(5) Cell balancing - for multi-cell packs, ensure cells stay balanced. Implementation with Linco MCU: (1) ADC channels monitor battery voltage and current

(2) Comparators for fast overcurrent shutdown

(3) Temperature sensor or external thermistor

(4) Software implements protection algorithms with hysteresis

(5) Gradual power reduction as battery depletes. Protection thresholds must be set based on specific battery specifications.

Monitor voltage, current, and temperature. Implement shutdown at safe thresholds. Follow battery manufacturer specs.