Open frame solenoids for wide range of applications

Open Frame Solenoids

  • Holding force up to 30N
  • Stroke up to 15mm
  • Life time up to 5 million cycles
  • Many mechanical options
  • Description
  • Good to know

  • Downloads

Open Frame Solenoids - Low-Cost Model with Many Mechanical Options

Open-frame linear solenoids are the least expensive of the linear solenoids. Like other linear solenoids, these open-frame linear solenoids are on/off actuators that develop a force in one direction when energized. The restoring force must be provided externally, such as by a return spring. They are used in many designs in a wide range of applications. The standard designs of open frame linear actuators are pulling. Butting versions can also be manufactured upon customer request. We also offer monostable and bistable lifting magnets, where one position is held currentless by a permanent magnet.

1. Design and Features
The open frame solenoids are designed and manufactured to obtain the maximum force output with the minimum of weight and size. Features include a large force output in a small size, minimum flux leakage by design, and a low level of operational noise. The structure consists of a slender cylinder as shown. The outside case is a high permeable steel to improve efficiency. Both pull and push type configurations are available as standard.

2. Stroke and Force
The open frame solenoid is designed for longer strokes than the conical push-pull type solenoid. As such, the pole piece designs are conical to maximize performance over longer strokes. To improve efficiency, the solenoid stroke should be minimized in the application.

3. Operational Considerations
A) Temperature
The coil data for tubular solenoids shows the values at ambient temperature 20°C and with a standard heat sink. If a solenoid is used at the ratings shown in the coil data, it is designed so that the coil temperature rises and reaches equilibrium at approximately 85°C. In applications where the ambient temperature is higher than 20°C or the heat sink is smaller than indicated in the catalog, possible thermal damage can occur.
Temperature rise tests should be performed by the customer to assure that the coil does not reach 120°C. Coils can be constructed to operate at temperatures higher than 120°C without thermal damage. Please consult the factory for details.
B) Air Gap Spacer
The tubular solenoid has an air gap spacer installed between the plunger stopper and the case. This spacer is installed to prevent the plunger and base from coming into mechanical contact with each other, which would cause residual magnetism.
C) Return Spring
The tubular solenoid does not include a return spring. Therefore, the application must include a return spring or modification at the factory.
D) Plunger and Shaft Modifications
It is not recommended that the costumer modify the plunger or shaft, as the shafts are manufactured and plated at the factory. Any special configurations can be supplied. Please consult the factory for details.

4. General Characteristics
Insulation class Class: E (120°C), Lead wire class A (105°C)
Dielectric strength: AC 1000V 50/60 Hz 1 min. (at normal temperature and normal humidity)
Insulation resistance: More than 100 Megohm at DC 500V megger (at normal temperature and normal humidity)
Expected life: Standard life: 2 million cycles, Extended life: 5 million cycles, Long life: 10 million cycles (Solenoid cycle life is very dependent upon side load, frequency of use, and environmental conditions. Cycle life tests should be performed by the customer.)

5. How to Select a Solenoid
Before selecting a tubular solenoid, the following information must be determined:
A) Force
The actual force required in the application should be increased using a safety factor multiplier of 1.5 to arrive at the force value that should be used in your specification.
B) Duty cycle
Use the aforementioned formula to calculate duty cycle. Also note the maximum on time.
C) Stroke
Stroke is determined by application requirements.
D) Operating voltage
Operating DC voltage is determined by application and voltage available.
After determining these specifications, one can find the correct size solenoid for the application, using the force-stroke characteristic tables and graphs. The coil data is also shown for different size of magnet wire. If the exact operating voltage is not in the coil data table, use the nearest voltage shown in the table. NOTE: When the operating voltage falls between 2 coil sizes, always us the higher AWG. numbered coil to prevent potential thermal damage. To determine the force output of the solenoid after temperature rise, please use the amp-turn force graphs after calculating the amp-turns.

6. Ordering Information
To order a Super Stroke solenoid, the correct part number must be determined from the table in the data sheet.

Article No. Stroke Force 10% ED Force 100% ED Dimensions Feature/Option Images 3D Data sheet Order Wishlist
RD-A420 4mm 2.5N 0.5N 21.4x10.8x9.8mm Voltage selectable Order
RD-B425 7mm 2.5N 0.9N 25x12x10mm Voltage selectable Order
RD-A520 6mm 5N 1.2N 20x15x13mm Voltage selectable Order
RD-U617 6mm 3.5N 0.7N 17x18x19mm Voltage selectable Order
RD-A622 12mm 4.5N 1N 21.5x18x14mm Voltage selectable Order
RD-S622 14mm 4.5N 0.5N 21.5x18x14mm Voltage selectable Order
RD-A625 14 4.5N 1.3N 25x20x16mm Voltage selectable Order
RD-A628 14mm 4.9N 1.5N 28x20x16mm Voltage selectable Order
RD-B630 7mm 8N 2N 31x15x13mm Voltage selectable Order
RD-U630 16mm 4.2N 1.8N 30x20x15mm Voltage selectable Order
RD-U640 16mm 3.7N 1.1N 40x20x15mm Voltage selectable Order
RD-A730 12mm 6N 1.4N 30x16x14mm Voltage selectable Order
RD-A732 16mm 9.9N 3.1N 32x21x16.5mm Voltage selectable Order
RD-A840 16mm 13.5N 5N 36.8x26x20mm Voltage selectable Order
RD-B840 16mm 9N 3N 40.8x19x14.5mm Voltage selectable Order
RD-A940 16mm 16N 5.1N 36.8x26x20mm Voltage selectable Order
RD-B945 14mm 14N 6N 46.5x23x19mm Voltage selectable Order
RD-A1040 16mm 18.2N 7.1N 40x29x24mm Voltage selectable Order
RD-A1053 16mm 22N 10.1N 53x30x27mm Voltage selectable Order
RD-A1250 16mm 31N 15N 50x40x36mm Voltage selectable Order
RD-A1264 16mm 28N 14N 64x38x30mm Voltage selectable Order