ZHCSDA7G July 2014 – February 2018 DRV10983
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 說明 （續）
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3 Feature Description
- 8.4
Device Functional Modes
- 8.4.1 Motor Parameters
- 8.4.2 Starting the Motor Under Different Initial Conditions
- 8.4.3 Motor Start Sequence
- 8.4.4 Start-Up Current Setting
- 8.4.5 Closed Loop
- 8.4.6 Current Limit
- 8.4.7 Lock Detect and Fault Handling
- 8.4.8 AVS Function
- 8.4.9 PWM Output
- 8.4.10 FG Customized Configuration
- 8.4.11
Diagnostics and Visibility
- 8.4.11.1 Motor Status Readback
- 8.4.11.2 Motor Speed Readback
- 8.4.11.3 Motor Electrical Period Readback
- 8.4.11.4 BEMF Constant Readback
- 8.4.11.5 Motor Estimated Position by IPD
- 8.4.11.6 Supply Voltage Readback
- 8.4.11.7 Speed Command Readback
- 8.4.11.8 Speed Command Buffer Readback
- 8.4.11.9 Fault Diagnostics
- 8.5 Register Maps
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12器件和文檔支持
- 13機械、封裝和可訂購信息
8.4.7.3 Lock2: Abnormal Kt
For any given motor, the integrated value of BEMF during half of an electrical cycle is constant. It is determined by BEMF constant (Kt) (see Figure 32). It is true regardless of whether the motor is running fast or slow. This constant value is continuously monitored by calculation and used as criteria to determine the motor lock condition. It is referred to as Ktc.
Based on the Kt value programmed, create a range from Kt_low to Kt_high, if the Ktc goes beyond the range for a certain period of time, tLCK_ETR, lock is detected. Kt_low and Kt_high are determined by KtLckThr[1:0] (see Figure 33).
Figure 32. BEMF Integration
Figure 33. Abnormal Kt Lock Detect