2009

Oct.30, 2009

Minebea Co., Ltd.
Minebea Motor Manufacturing Corporation

Launching of Hybrid-type Stepping Motor with Encoder

~High-performance type with encoder added to lineup of standardized models~

Minebea Co., Ltd. and Minebea Motor Manufacturing Corporation ("Minebea") will launch sales of a hybrid-type stepping motor*1 with an optical rotary encoder*2 ("HB-type stepping motor with encoder") on November 1, 2009. It will join the lineup as a standardized model and can be ordered in small quantities all the way down to just one.

HB-type stepping motors with encoders are high-performance, two-phase stepping motors that use Minebea ball bearings and come equipped with a sensor that detects the position of the rotor (optical rotary encoder). These motors can obtain information such as rotating speed, rotational direction, angle of rotation and amount of rotation as an output pulse. Ordinary stepping motors are controlled by an open loop, but equipping these motors with an optical encoder enables closed-loop control. Moreover, this enables the prevention of motor step-out*3, which occurs during high-speed rotation and under high loads, so it helps improve motor reliability.

The motors are expected to be used primarily in industrial machines, medical equipment, robots and similar fields. Minebea seeks to achieve sales of 10,000 units in the first year on the market and eventually reach an annual sales volume of more than 300,000 units for the series as a whole.

image:HB-type stepping motor with encoder
Lineup 42 mm square type (3 different lengths, step angle of 1.8° and 0.9°)
56 mm square type (3 different lengths, step angle of 1.8°)
Sales price 7,300-10,600 yen each (for small lots)

Minebea has been selling standardized models of hybrid-type stepping motors since December 2008, and the lineup includes a type that comes with a gearbox. The standardized model series has received high marks from customers since they can be ordered individually and delivered quickly.

Specifications

Standard type: 1.8° step
Model Motor Size Step Angle Rated Current Resistance Holding Torque Inductance Rotor Inertia Detent Torque
(mm) (°) (A) (ohms) (mNm) (mH) (g·cm2) (mNm)
A17PMK053-00VS 42×34 1.8 0.85 4.2 170 6.3 37 11
A17PMK845-00VS 42×40 1.8 1.2 2.9 270 4.0 55 12
A17PMK858-00VS 42×40 1.8 0.75 7.4 270 10.0 55 12
A17PMK444-00VS 42×48 1.8 1.2 3.3 340 4.1 75 20
A17PMK455-00VS 42×48 1.8 0.8 7.3 340 9.7 75 20
A23KMK267-00VS 56×42 1.8 0.9 5.8 480 8.2 120 20
A23KMK251-00VS 56×42 1.8 1.8 1.5 480 2.4 120 20
A23KMK244-00VS 56×42 1.8 2.9 0.6 480 0.9 120 20
A23KMK066-00VS 56×54 1.8 1.0 7.0 900 15.1 200 34
A23KMK049-00VS 56×54 1.8 2.0 1.7 900 3.5 200 34
A23KMK044-00VS 56×54 1.8 3.0 0.85 900 1.7 200 34
A23KMK762-00VS 56×76 1.8 1.0 8.6 1400 17.3 360 50
A23KMK748-00VS 56×76 1.8 2.0 2.3 1400 4.8 360 50
A23KMK743-00VS 56×76 1.8 3.0 1.1 1400 2.2 360 50
*  Drive sequence: Unipolar
High-resolution type: 0.9 step
Model Motor Size Step Angle Rated Current Resistance Holding Torque Inductance Rotor Inertia Detent Torque
(mm) (°) (A) (ohms) (mNm) (mH) (g·cm2) (mNm)
A17PYZ053-00VS 42×34 0.9 0.85 4.2 160 8.0 37 11
A17PYZ845-00VS 42×40 0.9 1.2 2.9 260 5.3 55 17
A17PYZ858-00VS 42×40 0.9 0.75 7.4 260 13.5 55 17
A17PYZ444-00VS 42×48 0.9 1.2 3.3 330 5.6 75 24
A17PYZ455-00VS 42×48 0.9 0.8 7.3 330 12.8 75 24
*  Drive sequence: Unipolar

Product Drawing

42 mm square size

image:42 mm square size

56 mm square size

image:56 mm square size

Explanation of Terms

*1:Optical rotary encoder

A sensor that converts the mechanical displacement per revolution into digital signals and processes the digital signals to detect things like position and speed. Sensors that detect linear mechanical displacement are called "linear encoders."

*2:Stepping motor

A motor that converts electric signals into mechanical movement. The motor's rotation (angle, speed) is regulated by electric signals (number of pulses) and their frequency. Because the motor rotates strictly according to the number of electric signals it receives, it can rotate, not simply at constant speeds, but also intermittently, at variable speeds, backwards and forwards, and so on. For these reasons, this type of motor is used in control and positioning of office automation equipment such as printers and faxes, personal computer peripherals, digital devices, and other precision devices. Stepping motors are broken down into PM (permanent magnet), VR (variable resistor), and HB (hybrid) types.

*HB (hybrid type) stepping motors
Long lifespan, high-precision motors utilizing permanent magnets and a geared steel core in the rotor section.

*3:Step-out

Happens when the motor's revolution is not synchronized with (does not catch up with) the current, such as during high-speed rotation or under high loads, and it deviates from the desired angle. Under certain conditions, the motor may even stop.

Sales Inquiries: Minebea Motor Manufacturing Corporation
Stepping Motor Product Management HQ
TEL 81-3-5434-8836 FAX 81-3-5434-8830
E-mail jpslhbstdinfo@m-mmotor.com
Media Inquiries: Minebea Co., Ltd.
Corporate Communications Office
TEL 81-3-5434-8637 FAX 81-3-5434-8607
Information in the press releases is current on the date of the announcement.
Product information, contact and other context are subject to change without prior notice.

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