{"id":1220,"date":"2025-07-23T13:38:05","date_gmt":"2025-07-23T04:38:05","guid":{"rendered":"https:\/\/speecys.com\/?p=1220"},"modified":"2025-07-25T09:09:22","modified_gmt":"2025-07-25T00:09:22","slug":"1220","status":"publish","type":"post","link":"https:\/\/speecys.com\/?p=1220","title":{"rendered":"Types of servo motors"},"content":{"rendered":"\n

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\u4e00\u822c\u7684\u306b\u30ed\u30dc\u30c3\u30c8\u306b\u4f7f\u308f\u308c\u308b\u30b5\u30fc\u30dc\u30e2\u30fc\u30bf\u30fc\u306b\u306f2\u7a2e\u985e\u3042\u308a\u307e\u3059\u3002PWM\u30b5\u30fc\u30dc\u3068\u30b3\u30de\u30f3\u30c9\u30b5\u30fc\u30dc\u3067\u3059\u3002<\/p>\n\n\n\n

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\"\"<\/figure>\n\n\n\n

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\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n<\/div>\n\n\n\n\n\n\n\n

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\u306a\u3069\u3067\u3059\u3002<\/p>\n\n\n\n

There are two types of servo motors commonly used in robots: PWM servos and command servos.<\/p>\n\n\n\n

PWM servos are servos whose angle changes according to the pulse width of an analog signal called a PWM signal, and could be considered analog servos. Since they are analog, the angle is not accurate. They are used in low-cost hobby servos. Some inexpensive ones can be purchased for around $3.<\/p>\n\n\n\n

On the other hand, command servos use a digital serial bus such as RS485 as their connection interface, with the host sending the angle as a digital value, which is then received by the servo side and used to change the angle. Since the communication is digital, it is accurate and error-free, and since the signal is bidirectional, it is also possible to read the current position and motor status. Almost all high-end hobby and industrial servo motors use this method.<\/p>\n\n\n\n

We use PWM type for low-cost robot figures, and command type for two-legged walking robots and robot figures that require precise angle instructions. It is also possible to combine the two depending on the part.<\/p>\n\n\n\n

Important parameters when selecting a servo motor are:<\/p>\n\n\n\n

(1) Does it have sufficient torque (power) to move the skeleton?
(2) Is it small enough to fit inside the skeleton?
(3) Is it durable enough?
(4) Does it have sufficient command types?
(5) Does it have a built-in reduction gear?
(6) It is even better if it has a built-in clutch (overload protection).<\/p>\n\n\n\n

etc.<\/p>\n\n\n\n\n","protected":false},"excerpt":{"rendered":"

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