#033 Motion mechanism design - 11: Introduction of small motor characteristics

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#033 Motion mechanism design - 11: Introduction of small motor characteristics

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Date：March12, 2010

Categry : Drive mechanism design

#033 Motion mechanism design - 11: Introduction of small motor characteristics

Small motors can be categorized into: motors to obtain power by converting electrical energy to rotational energy, and motors for control where rotational position and velocity are regulated to achieve specific control purposes. The latter is mainly used for LCA（Low Cost Automation） purposes.
Here, the small motor characteristics are described.

Types and characteristics of various small motors

Main application

Type of small motor

Characteristics

Simple positioning

Motors with electro-magnetic brake

・	Often used for Z axis control since the load does not fall since the "power-off" brake can retain the shaft during a power outage.
・	Overrun: 0.5~1 revolutions
・	Rating: Minutes

Simple velocity control

Variable speed motor

・	Overrun: 0.5~1 revolutions
・	90〜1400r／min（50Hz）
・	90〜1700r／min（60Hz）

High accuracy positioning

Stepper motor

・	Excellent response at low speeds, low vibration.
・	High resolution: 0.72 deg./ step
・	High accuracy: ±0.05 deg. (no load)
・	Open loop control.
・	Large holding torque.

High speed/High accuracy positioning

Servo motor (AC)

・	Excellent response at high speeds, low vibration.
・	High resolution: 0.044 deg./step
・	High accuracy: ±0.022 deg. (no load)
・	Semi-closed loop control
・	Abnormal load condition can be detected.

Motors for power

Induction motor

・Overrun: 30~40 revolutions

Reversible motor

・	Overrun: 5~6 revolutions
・	Rating: 30 minutes
・	With a simple brake mechanism

＜Partial reference from Oriental Motor Corp. material＞

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