What this matched set delivers
The MR-J4-40A+HG-KR43J is a factory-matched servo amplifier and motor combination from Mitsubishi's MR-J4 series. The amplifier (MR-J4-40A) drives the HG-KR43J motor, a low-inertia, small-capacity AC servo motor fitted with an oil seal for applications where lubricant ingress is a concern. The system is rated for 0.4 kW output at a rated speed of 3000 r/min, with a rated current of 2.8 A and a maximum current of 9.1 A for peak torque demands. Maximum torque reaches 4.5 N·m, making this set suitable for positioning and speed-control axes in packaging, material handling, and general automation.
Control and interface specifics
Control is via sine-wave PWM with current control — the standard method for smooth torque at low speeds and low audible noise. The amplifier carries a general-purpose interface (type A), which accepts pulse-train and analog speed/torque commands from a motion controller or PLC. This is the most common interface for standalone servo applications without a dedicated motion network.