Category:Motor
Motor Type
| Type | Drive | Advantage | App | Limits |
|---|---|---|---|---|
| DC Motor | DC voltage | Fast, continuous rotation motors | computer cooling fans, or RC car wheels | |
| Stepper | MCU to individually energise each electromagnet and make the motor shaft turn | Slow, precise rotation, easy set up & control | \ Low torque on high speed | |
| Servo | PWM, three wires (power, ground & control) | Fast, high torque, accurate rotation within a limited angle, better than stepper, require a position encoder | Expensive |
- Brushed DC motors
A brushed DC motor is the most common small DC motor and can be found in everything from toys to tape-decks and battery-powered drills. They typically run at high speeds with relatively low torque. It has 2 leads and the Motor Shield can control the speed in both forward and reverse directions.
- DC Gear Motors
A DC Gear Motor is a brushed DC motor with a built-in gear train. These deliver high torque at medium to low speeds. These are typically found in drive-trains for robots and remote-control vehicles. They have two leads and are controlled the same as a regular brushed DC motor.
- Stepper Motor
A stepper motor is a specialized type of motor for precise position control. They are commonly found in disk drives and printers. Steppers may have anywhere between 4 and 8 leads and anywhere from 4 to more than 200 steps per revolution. The Motor Shield can control these in single or multiple steps for precise positioning.
- Servo
RC Servos are another specialized motor for precision positioning. Originally designed for operating Radio Controlled model cars and airplanes, they are now used extensively in hobbyist robotics too. An RC Servo has a 3-wire interface and most can be positioned over a range of 0-180 degrees with a precision of approximately one degree. The Motor Shield has header connections for 2 RC servos.
- Continuous Rotation Servo
Continuous Rotation Servos are basically RC servos with the position feedback and limit mechanisms removed (Technically, with no feedback they are not really "servos" anymore.). Although they share the same 3-wire interface as the RC Servos, they have no position control. They function much like DC gear motors with speed control in forward and reverse.
有感是通过电机内的霍尔元件感应转子的状态和位置。
无感是电调通过三条供电线路来感应电机内转子的速度和状态。
有感在电机静止的状态下就知道转子的位置，而无感，要动起来才能判断，所以无感刚起步的时候会抖，而且低速很难控制，有感在这些方便基本可以媲美有刷电机。同时有感是单独一根感应线，不容易受到干扰，判断也比较准确，无感是用供电线路来判断，多少会受到供电线路馈电和电感的影响，所以没有有感的准确。