Anti-lock brake circuit for reducing mechanical shock of servo motor
By introducing an oscillation circuit with capacitors and resistors into the servo motor braking circuit, the mechanical impact during emergency braking is mitigated, solving the problems of equipment vibration and positioning deviation caused by servo motor braking, and improving the safety and accuracy of the equipment.
Patent Information
- Application Number
- CN202423023804.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-09
AI Technical Summary
Existing emergency braking methods for servo motors are prone to mechanical shock and overload, especially in systems with high inertia, which can lead to equipment vibration and positioning deviation, affecting equipment lifespan and accuracy.
An oscillating circuit consisting of a DC power supply, relays, diodes, resistors, and capacitors is connected in parallel with the braking coil. The capacitor provides a continuous current, and the resistor heats up to gradually reduce the current, thus relieving braking and preventing lock-up. An adjustable resistor is used to adjust the anti-lock time to match the system inertia.
It effectively reduces the mechanical impact of servo motors, extends the service life and accuracy of equipment, improves equipment safety, and adapts to the braking requirements of different inertial systems.
Smart Images
Figure CN223613242U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to servo motor field, specifically speaking is a kind of anti-lock brake circuit for reducing servo motor mechanical impact. BACKGROUND
[0002] Automatic servo turntable and seventh shaft are widely used in the field such as automation, such as large clamp is turned over on welding turntable, and linear motion is carried out on seventh shaft by carrying robot.In order to improve efficiency, precise welding turntable is used to turn over and exchange clamp.In actual production, two kinds of stopping modes are often adopted in abnormal stop or emergency state, one is that servo motor is continuously powered in controllable condition, servo motor reverse torque is used to brake and stop, but stopping time is long, and moving distance is far.The second is that servo drive is immediately powered off, brake is started to immediately lock servo motor shaft, and maximum acceleration braking is realized.However, servo motor brake torque is large, extreme overload condition is prone to occur, mutual slippage is prone to occur, turntable positioning deviation is caused, and equipment is damaged.
[0003] Especially, welding turntable used by large-tonnage welding clamp needs emergency brake in emergency or stops power supply in high-speed operation, due to large inertia of welding clamp, large mechanical brake torque of servo motor is instantaneously acted, equipment is caused to form violent vibration in high-speed operation, precise RV reducer is damaged and connection is slided.Therefore, "after sudden stop" original position deviation often occurs, and equipment precision is reduced.
[0004] The reason is that existing servo motor emergency brake mode adopts relay to directly disconnect loop, brake spring is reset after brake coil loses power, and brake pad is directly locked.In existing brake circuit, mechanical torque is directly acted by spring force, and is in maximum brake torque;For rigid and strong system, equipment vibration is small.However, for inertia and weak system, the braking mode can cause violent vibration and overload.In high-speed operation of equipment, extreme overload condition is prone to occur in rapid braking, mutual slippage is prone to occur, turntable positioning deviation is caused, equipment is damaged, and equipment life is affected.Because inertia of each equipment is different, suitable brake torque cannot be accurately matched, so that system brake process is in overhard or oversoft state. INVENTION CONTENTS
[0005] The utility model aims at providing a kind of anti-lock brake circuit for reducing servo motor mechanical impact to protect servo motor emergency brake.
[0006] To solve the above technical problems, the specific scheme adopted by the utility model is as follows:
[0007] An anti-lock braking circuit for reducing mechanical shock to a servo motor includes a DC power supply, a relay K, a diode D, and a brake coil L. The positive terminal of the DC power supply is connected to the anode of the diode D via the relay K, the cathode of the diode D is connected to one end of the brake coil L, and the negative terminal of the DC power supply is connected to the other end of the brake coil L. An oscillation circuit consisting of a resistor R and a capacitor C connected in series is connected in parallel with the brake coil L, and the resistor R is connected to the cathode of the diode D.
[0008] Furthermore, the resistor R mentioned above is an adjustable resistor.
[0009] Due to the adoption of the above technical solution, this utility model has the following beneficial effects:
[0010] This utility model relates to an anti-lock braking circuit that reduces mechanical shock to servo motors. It not only solves the problems of "mechanical shock" and "flexible braking" that often occur in emergency situations, but also reduces the braking burden, extends the service life and accuracy of equipment, and allows for direct mechanical braking at high speeds, improving equipment safety. It has high practical production application value. Furthermore, the adjustable resistor allows for adjustment of the anti-lock time and matching of system inertia, making it highly adaptable. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the anti-lock braking circuit for reducing mechanical shock to servo motors according to this utility model. Detailed Implementation
[0012] like Figure 1 As shown, the anti-lock braking circuit for reducing mechanical shock to the servo motor includes a 24V DC power supply, a relay K, a diode D, and a brake coil L. The positive terminal of the DC power supply is connected to the anode of the diode D via the relay K, the cathode of the diode D is connected to one end of the brake coil L, and the negative terminal of the DC power supply is connected to the other end of the brake coil L. An oscillation circuit consisting of a resistor R and a capacitor C connected in series is connected in parallel with the brake coil L, and the resistor R is connected to the cathode of the diode D.
[0013] The resistance value of the resistor R mentioned above is 10 to 30 Ω.
[0014] In the emergency stop state, the servo motor is immediately powered off, the brake relay is actuated, and the relay actuation circuit is cut off. The DC power supply and the brake coil circuit are disconnected. Since the brake coil L is an inductive element in the disconnected circuit, the current is reduced; the capacitor C provides the ability to continuously flow the current, and at the same time, the inductive current flows through the resistor R to generate heat, gradually reducing the current in the circuit. As the current decreases, the brake coil slowly releases, and the brake pad is braked under the action of the spring. When the current in the circuit oscillates and disappears, the anti-lock process is completed. At the same time, the resistor R is an adjustable resistor, which can adjust the anti-lock time and match the system inertia. When the system inertia is large, the resistance needs to be adjusted to increase the oscillation time and extend the anti-lock time, and reduce the impact of the system.
[0015] The brake circuit of the servo motor is a DC circuit, and the oscillation circuit composed of the resistor R and the capacitor C in series is connected in parallel with the brake coil. Diode D is used to prevent reverse current and prevent mutual influence in multiple brake coil actions. In the brake opening process of the servo motor, the brake is quickly opened because the brake coil is directly connected to the control power supply. In the normal use process, the diode D has a conduction voltage of 0.7V, which has a very small effect on the 24V DC power supply, and the brake coil is normally attracted, and the brake circuit is not affected. In the brake braking process, the servo motor is immediately powered off, the relay is actuated, the relay actuation circuit is cut off, the brake coil resistance is reduced, the current is provided by the capacitor C in the circuit, and the current continuously oscillates in the oscillation. At the same time, the resistor generates heat to gradually consume the energy in the circuit, and as the current decreases, the brake coil slowly releases, and the brake pad is braked under the action of the spring, realizing the anti-lock braking function in the emergency state.
[0016] In actual use cases: the resistance value is 10-30Ω, the resistance power is 2W, the electrolytic capacitor is 63V 1000μF, and the brake anti-lock time is 50-300ms. In actual application, there is obvious buffering effect.
Claims
1. An anti-lock braking circuit for reducing mechanical shock to a servo motor, characterized in that: It includes DC power supply, relay K, diode D, brake coil L, the positive pole of DC power supply is connected with the anode of diode D through relay K, the cathode of diode D is connected with one end of brake coil L, the negative pole of DC power supply is connected with the other end of brake coil L; the oscillation circuit formed by the series connection of resistance R and capacitor C is connected in parallel with brake coil L, and resistance R is connected with the cathode of diode D.
2. The antilock brake circuit for reducing mechanical shock of a servo motor according to claim 1, wherein: the brake switch is a relay switch. The resistance R is an adjustable resistance.