A single-phase asynchronous motor is a motor that requires only a single-phase AC power supply. It consists of a stator, rotor, bearings, housing, end covers, etc. The stator is composed of a frame and a wound iron core.
Motor stall:
The torque at which an electric motor operates at its rated power is called the rated torque, and the speed at this point is called the rated speed. Due to the external characteristics of the motor (also known as output characteristics or torque characteristics), the speed (n) of the motor varies with the load on the shaft (TL load torque) within the motor's operating range (TM-TL = an algebraic expression containing n). As the load increases to a certain extent, the speed will drop sharply. When the load on the shaft causes the motor speed to drop to 0, it is called a stalled rotor, and the load torque at this point is the stall torque, measured in kg·m. It is a physical quantity that measures the ultimate output capability of an electric motor.
When a motor is stalled, its power factor is extremely low, and the stall current (called stall current) can reach up to 7 times the rated current. If this continues for a while, the motor will burn out. Therefore, the stall test is a common test for motors.
Most motors have overheat protection. When the motor stalls, the current increases rapidly, causing a lot of heat to be generated. Once the heat reaches a certain level, the motor automatically disconnects and enters protection mode. At this time, the motor will not work until the heat dissipates. To prevent this situation from happening frequently, an electronic control unit is usually needed to measure the motor's operating current. Once the current exceeds the normal value, the power supply is immediately cut off, and a buzzer alarm is sounded.
Coreless motors vs. cored motors, brushed motors vs. brushless motors. Coreless motors have only a plastic-sealed copper coil rotor with a permanent magnet. Cored motors have both a core on the rotor and a core on the core. Coreless motors have lower power output than motors used in toy cars. However, cored motors are designed for larger motors and have higher output.
Brushless motors are common; generally, three-phase AC asynchronous motors are brushless, while AC synchronous motors are brushed. Most power tool motors (drills, cutters, etc.) are brushed. Brushless motors offer good speed and are easy to control, while brushed motors offer good speed control.
linear motor
Linear motors are divided into two types: those with iron cores and those without iron cores.
DDL linear motors are essentially planar unfolded and directly connected to the driven load. Rotary motors using this structure eliminate all mechanical transmission components (e.g., ball/lead screws, racks and pinions, belts/pulleys, and reducers), thereby eliminating backlash, flexibility issues, and related problems caused by mechanical transmission.
A linear motor is a transmission device that directly converts electrical energy into linear motion mechanical energy without any intermediate conversion mechanism. It can be viewed as a rotary motor cut radially and unfolded into a plane.
The large image shows a coreless linear motor, commonly known as a U-shaped linear motor; the small image shows a linear motor with an iron core, commonly known as a flat linear motor.
X-phase X-wire: The mains power we usually see has four wires: three live wires and one neutral wire, which is called three-phase four-wire. A single live wire is one phase. As the name suggests, three live wires are called three-phase (380V). Two-phase means two live wires (380V), while single-phase means one live wire and one neutral wire (220V). However, some people in society call one live wire and one neutral wire "two phases", which is a misunderstanding. They call two wires "two phases".
Stepper motor
static moment
Or it can be called holding torque:
Holding torque refers to the torque with which the stator holds the rotor in place when the stepper motor is energized but not rotating. It is one of the most important parameters of a stepper motor, and typically, the holding torque at low speeds is close to the holding torque. Because the output torque of a stepper motor decreases with increasing speed, and the output power also varies with speed, holding torque becomes one of the most crucial parameters for evaluating a stepper motor. For example, when people say a 2 N·m stepper motor, unless otherwise specified, they mean a stepper motor with a holding torque of 2 N·m.
Detenttorque
Also called self-positioning torque
This refers to the torque with which the stator locks the rotor when the stepper motor is not powered on. Since there's no standardized translation for "DETENTTORQUE" in China, I'm not sure if this is the same as the positioning torque you're referring to, but I assume it is.
Stepper motor
static moment
Or it can be called holding torque:
Holding torque refers to the torque with which the stator holds the rotor in place when the stepper motor is energized but not rotating. It is one of the most important parameters of a stepper motor, and typically, the holding torque at low speeds is close to the holding torque. Because the output torque of a stepper motor decreases with increasing speed, and the output power also varies with speed, holding torque becomes one of the most crucial parameters for evaluating a stepper motor. For example, when people say a 2 N·m stepper motor, unless otherwise specified, they mean a stepper motor with a holding torque of 2 N·m.
Detenttorque
Also called self-positioning torque
This refers to the torque with which the stator locks the rotor when the stepper motor is not powered on. Since there's no standardized translation for "DETENTTORQUE" in China, I'm not sure if this is the same as the positioning torque you're referring to, but I assume it is.
