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Servo motor selection constitutes a critical link that determines system performance throughout the design process of automated equipment. From high‑speed cutting in CNC machine tools to flexible operation of industrial robots, from micron‑level positioning for semiconductor packaging to synchronous flying‑shear applications on packaging production lines, servo motors are indispensable for nearly all automation scenarios demanding precise position, speed and torque control. Nevertheless, confronted with a vast array of models and complicated technical parameters on the market, how to select an appropriate servo motor for a specific application scenario? Systematic evaluation shall be conducted from two dimensions: requirement matching and…

AC PMSM Servo Motor Selection 6 – Cooling Method, IP Rating & Ambient Temperature

Motors are not afraid of working hard; what they fear is working under constrained conditions. Motors generate heat during operation. With a reliable thermal design, a motor can deliver stable output. If heat cannot dissipate effectively, temperatures will rise sharply. Consequences range from derated operation in mild cases to insulation failure or permanent magnet demagnetization in severe cases. Therefore, when selecting a motor, it is necessary to consider not only its output capacity but also its operating environment and thermal design. This involves three key parameters: cooling method, ingress protection (IP) rating, and ambient temperature. Cooling Method: How Heat…

How to Match Drive Solutions for Brushed DC, Stepper and Brushless Motors

When undertaking a motor control project, the first step is often not motor selection, but defining the drive solution. Many novice developers fall into a common pitfall: they finalize the motor first, only to end up with an incompatible driver IC. Issues include insufficient power to drive the motor, over-specified functions that drive up costs, or mismatched control schemes making tuning impossible. Brushed DC, stepper and brushless motors are the three most common types. They operate on fundamentally different principles and require completely distinct drive solutions. Today, we break down the drive logic, key selection criteria and typical solutions…

It’s Not Bearing Damage That Electric Spindles Fear Most — This Fault Incurs Even Higher Repair Costs

When most people encounter an electric spindle malfunction, their first thought is: Could the bearings be damaged? Bearing failure is indeed common. However, during practical maintenance, there is another issue that tends to be overlooked, and the repair costs can be substantial. That issue is stripped threads on the spindle rotor. Though it appears to be merely a thread fault, stripped threads make it difficult to clamp cutting tools securely. Without proper tool clamping, the spindle cannot operate normally for machining, and in severe cases, it may become virtually unusable. Complicating matters further, damaged rotor threads often cannot be…

Inner Rotor Motor vs. Outer Rotor Motor: Key Differences

Permanent magnet synchronous motors can be divided into outer rotor and inner rotor structures according to the position of the rotor inside the motor. The distinction lies in whether the inner part or the outer part rotates. If the inner part rotates, it adopts an inner rotor structure; if the outer part rotates, it features an outer rotor structure. Generally speaking, the rotating component fitted with magnetic steel is the rotor, while the stationary component fitted with coils is the stator. Let us discuss the differences between inner rotor and outer rotor permanent magnet motors. In practical applications, the…

How to Choose: Three-phase / Stepper / Servo / DC Motors

For technicians engaged in electrical automation, electrical maintenance and equipment commissioning, motors are daily working partners. However, many people with years of working experience still struggle to distinguish between three-phase asynchronous motors, stepper motors, servo motors and DC motors. They get confused when selecting models, fail to understand wiring principles, and keep running into pitfalls during commissioning. Common issues include equipment vibration, unstable rotational speed and inaccurate positioning. Today we will thoroughly break down the four most widely used industrial motors, including their working principles, core features, applicable scenarios, advantages and disadvantages. After reading this guide, you will never…

From 3-Axis to 5-Axis: How 4th/5th-Axis Rotary Tables Serve as the Key to Machining Upgrading

01 What Is Underway in the Machining Industry? Halfway through 2026, the machining industry has reached unprecedented momentum. At the 14th China CNC Machine Tool Fair 2026 (CCMT2026) held in April, a total of 441 five-axis linkage machine tools were on display, among which 235 were five-axis machining centers. Almost every exhibitor brought its self-developed five-axis models to the show. Industry observers commented: “The explosive growth of five-axis machine tools is no accident, but driven by both rigid market demand and national strategic priorities.” Meanwhile, the 15th Five-Year Plan has explicitly proposed adopting extraordinary measures to push forward the…

Imported vs Domestic Electric Spindles: In-Depth Comparison of Precision, Lead Time and Maintenance Costs at a Glance

Many equipment manufacturers have fallen into the same costly pitfall: choosing domestic electric spindles saves money in the short term, but precision drifts continuously during mass production, and frequent repairs slow down capacity. On the other hand, biting the bullet and ordering original European or American spindles means enduring a long lead time of 3 to 6 months. Once the spindle is damaged, parts have to travel across oceans, halting production lines for half a month — the downtime loss far exceeds the cost of the equipment itself. Procurement teams that only compare prices end up losing out on…

How to Judge Whether a Three-Phase Motor Is Good or Bad

A three-phase motor winding consists of three sets: U, V and W. There are two internal connection types: Star (Y) and Delta (△). Multimeter setting: Resistance mode (low resistance range) I. Continuity and Integrity Test of Three-Phase Windings (Conduct test with power disconnected; all external power cables must be detached) 1. Star Connection (neutral point connected together; three live leads plus an optional neutral wire) Measure resistance between each pair: U-V, V-W, W-U Normal condition: The resistance values of the three pairs are roughly equal with minimal deviation. Measure resistance between each live wire and the motor housing (ground…

Motor Spindles: Current Situation & Future Trends 2026

Driven by new energy vehicles, industrial automation, high-end equipment manufacturing, and intelligent manufacturing, the high-speed motor spindle—a core functional component for precision machining—is entering a golden period of technological iteration and market expansion. The industry as a whole is advancing in five major upgrade directions: high-speed, high-precision, intelligent, automotive-grade, and green. Domestic substitution is accelerating across the board, and leading local enterprises, leveraging their technological and supply chain advantages, are rapidly breaking the monopoly held by foreign brands. 01 Current Development of the High-Speed Motor Spindle Industry: Surging Demand and Technological Upgrading in Parallel Market Size: Steady Growth with…

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AC PMSM Servo Motor Selection 6 – Cooling Method, IP Rating & Ambient Temperature

How to Match Drive Solutions for Brushed DC, Stepper and Brushless Motors

It’s Not Bearing Damage That Electric Spindles Fear Most — This Fault Incurs Even Higher Repair Costs

Inner Rotor Motor vs. Outer Rotor Motor: Key Differences

How to Choose: Three-phase / Stepper / Servo / DC Motors

From 3-Axis to 5-Axis: How 4th/5th-Axis Rotary Tables Serve as the Key to Machining Upgrading

Imported vs Domestic Electric Spindles: In-Depth Comparison of Precision, Lead Time and Maintenance Costs at a Glance

How to Judge Whether a Three-Phase Motor Is Good or Bad

Motor Spindles: Current Situation & Future Trends 2026

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