Dual AC Servo Driver 点击：929 | 回复：10
发表于：2007-11-09 22:14:00
楼主
AC Servo motors, utilizes high-energy product magnets and is characterized by high thrust density, low losses, small electrical time-constant & rapid response. As AC Servo motors are brushless, this implies the motor has a higher efficiency, reduced EMI generation and requires no maintenance as if the brushes motor. Hence there is no deterioration of performance over the life of the motor.
To power the AC servo motor a multi-phase(3-phase) power driver with software communication is developed that aim at high performance, high efficiency, compact-size& at low cost. PWM switching technique, analog current control loop, complete protection schemes will be employed in developing the AC servo driver.
The AC servo Driver has following features:
. 24VDC to 165VDC motor power supply
. 20A peak or 6A continue driving capability
. Small signal circuit powered externally to save cost
. power side & signal side are electrically isolated
. Software communication
. 18KHz PWM frequency(equivalent 36KHz switching frequency)
. DC to 4KHz bandwidth
. <50mA current drift per phase from 25℃ to 75℃( heat sink)
. Configurable gain setting
. Configurable motor impedance matching
. Over-temperature protection(75℃ heat sink)
. Configurable Peak current & Run current (I-t) protection.
. Output short together or shut to ground protection
. Over-voltage shut down protection
. LEDs for signal indications
. Dual-channel per kit
Block Diagrams
Motor Connection
Motor is usually a 3-phase Y-connected motor. The motor manufacturers usually specify the phase-to phase inductance (Lm) & resistance (Rm). Phase to phase value will be used in setting the driver. Notice a correct R, S & T phase sequence will result in a positive encoder output.
The current control loop
The above is the simplified current control loop block diagrams of the AC servo driver( l current loop only). The function of the blocks are described in the following table:
Item block Description
1 Current command 1200 phase shift sine signal input x2
2 Pre-amp gain G The input signal pre-amplifier. Can be
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