Measures to prevent voltage drop in lead-acid batteries: positioning servo motor
Explaining the differences in discharge voltage characteristics between lead and lithium. AC servo motors that can be considered for AGVs and robotic arms where stopping precision is required.
When considering the power source for AGVs (automated guided vehicles), the "voltage drop characteristics during discharge" is an important factor directly related to driving performance. Lead-acid batteries have the characteristic of gradually decreasing voltage as discharge progresses and battery capacity decreases. As a result, in the latter half of operation, the voltage supplied to the motor drops, leading to a decrease in the AGV's driving speed and torque. On the other hand, lithium-ion batteries have a "constant voltage characteristic," maintaining a flat voltage until the end of discharge, allowing for stable driving performance right up until the battery is depleted. The "AC servo motor (CMS series)" that we handle leverages the stable voltage supply of these lithium batteries, making it a motor that can be considered for the drive axis of unmanned transport equipment, which requires millimeter-level stopping accuracy at stations and precise trajectory control of multi-joint arms.
basic information
■ Discharge Voltage Characteristics and Key Points of Motor Control - Differences in Discharge Curve: Lead batteries experience a drop in terminal voltage proportional to capacity reduction, necessitating control on the inverter or driver side to compensate for voltage fluctuations. Lithium batteries have a wide plateau region, providing stable power supply. - Impact on Stopping Accuracy: With stable voltage, the torque response during acceleration and deceleration is consistently maintained, making it easier to achieve precise braking control for stopping at the desired position. ■ Features of AC Servo Motors for Precision Positioning (CMS Series) - Feedback from high-resolution encoders can be utilized to build stable speed and position control that is less affected by voltage fluctuations. - Compatible with low-voltage operation at DC 24V/48V, making it suitable for integration into the design of joints and lifting axes in battery-powered robots. - We conduct domestic inspection for prototypes and small lots, ensuring quality delivery.
Price information
We have adopted a cored design using powerful neodymium magnets and established a production system for standard stock items, which allows us to offer excellent pricing and delivery times. Prices may vary depending on annual usage quantities, the number of lots, and the presence of drivers and gearheads, so if you are looking to reduce costs, please feel free to request a quote. Our sales department will do its utmost to accommodate your budget and preferences.
Delivery Time
Model number/Brand name
CMS Series
Applications/Examples of results
【Examples of Applications Utilizing Discharge Characteristics in Precision Drive Equipment】 - Driving and steering axes of AGVs (Automated Guided Vehicles) that require millimeter-level stopping accuracy at stations. - Multi-joint drive components of mobile manipulators (arm-equipped AGVs) that operate on battery power. - Actuators for picking robots and lifting devices in automated warehouses that require stable torque. 【Our Motor Lineup】 - AC servo motors for automation equipment and positioning (CMS series). - Brushless motors for driving conveyors and similar applications (CMH series). - Wheel-type geared motors for heavy load transport AGVs (WGM series). - Direct motors for lightweight autonomous robots (HSM series).
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Line up（7）
| Model number | overview |
|---|---|
| CMS40 | （□40 / 25W～50W / 0.12～0.16Nm） |
| CMS60 | （□60 / 100W～300W / 0.5～1.47Nm） |
| CMS80 | （□80 / 375W～750W / 1.84～3.70Nm） |
| CMS110 | （□110 / 550W～1175W / 2.50～5.76Nm） |
| CMS130 | （□130 / 525W～2400W / 2.5～14.6Nm） |
| CMS180 | （□180 / 2400W～5200W / 11.5～24.6Nm） |
| The entire series | All models are equipped with options for a non-excited electromagnetic brake and a planetary gear head. |
catalog（3）
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Distributors
CLUW Inc. specializes in low-voltage battery-driven motors and control drivers, offering a comprehensive lineup from compact to high-power models. Our product range includes Brushless DC Motors, Battery-Driven AC Servo Motors, Geared Motors, In-Wheel Motors, and Cooling Fans. Beyond product supply, we deliver dedicated technical support—from driver selection and setup guidance to troubleshooting—ensuring seamless operational integration for our customers.