Sharp AE-Z35PR, Руководство по обслуживанию

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AY-ZP35PR
IPM overcurrent
detection circuit
5V
0V
IC1
R49
Overcurrent
Shunt resistance
P
N
CiN
FO
24
26
34
51 56
5. 120° Energizing control (digital position detection control)
This control system detects the digital position detection signal and adjusts the rate of acceleration/deceleration accordingly.
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tion signal is generated as a reference voltage equaling 1/2 of 280 VDC. However, since there is no induced voltage waveform when
the PWM waveform is OFF, the microcomputer performs internal processing so that detection is enabled only when it is ON. Based on
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racy is high.
The microcomputer performs internal processing to cancel spike voltage during the regenerative process.
Furthermore, even if the induced voltage is low, position detection is still possible, thus allowing sensor-less operation at low rotation
speed in the initial stage of operation.
This reduces the starting current and improves the IPM reliability.
Comparator output waveform
(Position signal waveform)
Terminal voltage waveform
Reference voltage
(1/2 of DC voltage)
Spike voltage
(cancelled)