In vertical injection molding machines, the key differences between conventional motors and servo motors lie primarily in energy consumption, control accuracy, response speed, and operational stability. These differences are as follows:
1. Drive Method and Energy Consumption
• Ordinary Motors: Typically use asynchronous motors, supplied with oil by a metering pump. The motors continuously run at a fixed speed, maintaining high energy consumption even under low loads, resulting in significant energy waste.
2. Control Accuracy
• Ordinary Motors: Rely on mechanical valves to control flow and pressure, resulting in low precision and prone to repeatability errors, which can affect product consistency (e.g., uneven wall thickness).
3. Response Speed
• Ordinary Motors: Slow startup and speed regulation, with lags when switching between actions, impacting production efficiency.
4. Operational Stability and Noise
• Ordinary Motors: Exhibit high vibration and noise during operation, generate heat easily with long-term high-load operation, and have a relatively short lifespan.
1. Drive Method and Energy Consumption
• Servo motors: Paired with a servo drive and variable displacement pump, the motor speed can be dynamically adjusted based on the real-time needs of the injection molding machine (e.g., clamping, injection, etc.). When the load is low, the speed is reduced, significantly reducing energy consumption, typically achieving energy savings of 30%-70%.
2. Control Accuracy
• Servo motors: A closed-loop control system provides real-time feedback on parameters such as pressure and flow, allowing precise output adjustment. This provides high repeatability and enables stable production of high-precision products (e.g., precision electronic components).
3. Response Speed
• Servo Motors: Fast response, enabling rapid start/stop, acceleration/deceleration, shortening process switching time and improving production cycle time.
4. Operational Stability and Noise
• Servo Motors: Smooth operation, low noise, and low heat generation. Their excellent load adaptability results in a low failure rate and a longer service life.
Summary：
Ordinary motors are relatively inexpensive and suitable for the production of simple products with low precision and energy requirements. While servo motors have a higher initial investment, they offer significant advantages in energy saving, precision, and efficiency, making them more suitable for precision injection molding and high-volume production. Long-term use can reduce overall costs.
