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RAJ306101 RSSK User's Manual
3.3
Sensorless 120-degree Conducting Control
3.3.1
Control Specifications
The sensorless 120-degree conducting control is a method that controls the motor by switching the energized
phase based on the inductive voltage (BEMF) generated by the motor rotation.
Table 3-2 show the control specifications.
For details of the specifics of the program, please refer to the "RAJ306101 Application Note: Sensorless
120-degree conducting control for permanent magnetic synchronous motor (Implementation)
(R18AN0058EJ)".
Table 3-2 Basic Specifications of Sensorless 120-degree Conducting Control Software
Item
Control method
Motor rotation
start/stop
Position detection of
rotor magnetic pole
Input voltage
Carrier frequency
(PWM)
Control cycle
Rotation speed control
range
SW routine for
protection
R12UZ0129EJ0100
Rev.1.00
Nov 1, 2023
Content
120-degree conducting method (chopping at the first 60 degrees)
Determined by the level of SW101
"Low": rotation stop "High": rotation start or input from GUI
Position detection by inductive voltage (by 60 degrees)
DC24[V]
20[kHz]
Zero-crossing determination is performed from inductive voltage, for each carrier
cycle
PWM duty settings and conduction pattern are determined when switching
patterns
Speed PI control: every 2[ms]
Both CW and CCW: 1000[rpm] to 2650[rpm]
Disables the motor control signal output (six outputs), under any of the following
conditions.
1. Current of each phase exceeds 0.89[A] (monitored every 50[μs])
2. Inverter bus voltage exceeds 28[V] (monitored per 50[μs])
3. Inverter bus voltage is less than 14[V] (monitored per 50[μs])
4. Rotation speed exceeds 3000[rpm] (monitored per 50[μs])
5. At the time of sensorless drive, zero-crossing is not detected for 50[ms].
6. Fault detection of virtual Hall sensor pattern (position information)
7. Fault detection of the smart gate driver.
The ports executing PWM output are set to low when an overcurrent is detected
(when a falling edge of the POE10# port is detected).
Chapter 3. Usage
Page 25 of 55
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