Method for operating an electric motor arrangement and corresponding electric motor arrangement
A technology of electric motors and actuators, applied in AC motor control, electronic commutation motor control, single motor speed/torque control, etc., can solve problems such as high load level, and achieve the effect of reducing load
Active Publication Date: 2018-05-18
ROBERT BOSCH GMBH
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Problems solved by technology
However, interrupt requests or interrupts that initiate the interrupt routine cause a high degree of load on the microprocessor, especially because the microprocessor is not available for other tasks during execution of the interrupt routine.
Correspondingly, the microprocessor must have high computing power
Method used
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[0031] figure 1 A schematic diagram of an electric motor arrangement 1 with an electronically commutatable electric motor 2 with three motor phases 3 , 4 and 5 each having at least one coil 6 is shown. The coil 6 is generally assigned to a stator of the electric motor 2 , while a rotor (not shown) mounted rotatably relative to the stator has permanent magnets. Of course, other embodiments of the electric motor 2 can also be used, in particular embodiments with any desired number of motor phases which can also be connected as desired.
[0032] Each motor phase 3 , 4 and 5 is connected to an actuator 7 , 8 or 9 . Each actuator 7 , 8 and 9 has a first switch 10 , in particular a high-side switch (high-side switch), and a second switch 11 , in particular a low-side switch (low-side switch). The motor phases 3 , 4 and 5 are connected to the actuators 7 , 8 and 9 via connections 12 which are electrically arranged between the switches 10 and 11 . The first switch 10 is connected o...
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The invention relates to a method for operating an electrical motor apparatus (1) having a microprocessor (16), an working memory (17) and an electrically commutable electrical motor (2), which has a plurality of motor phases (3, 4, 5), each of which are connected to an actuator (7, 8, 9), which is activated by a pulse width modulation apparatus (19) in modulation periods, wherein the pulse width modulation apparatus (19) activates the respective actuator (7, 8, 9) during each modulation period based on a target pulse duty factor allocated to the respective motor phase (3, 4, 5). According to the invention, the microprocessor (16) writes at least one table (27, 27', 27", 27"') having a plurality of successive specified pulse duty factors (26,26', 26", 26"') to the working memory (17) and one of the specified pulse duty factors (26,26', 26", 26"') is periodically read from the table (27, 27', 27", 27"') by means of a direct memory access, circumventing the microprocessor (16), for each motor phase (3, 4, 5) and supplied to the pulse width modulation apparatus (19) as a target pulse duty factor. The invention furthermore relates to an electrical motor apparatus (1).
Description
technical field [0001] The invention relates to a method for operating an electric motor arrangement with a microprocessor, a working memory and an electronically commutatable electric motor, the electric motor having a plurality of motor phases, the motor The phases are each connected to an actuator which is controlled (ansteuern) in a modulation cycle by means of a pulse width modulator which during each modulation cycle depends on the nominal duty cycle assigned to the corresponding motor phase (Soltastverhältnis ) to control the corresponding actuator. Furthermore, the invention relates to an electric motor arrangement. Background technique [0002] Methods of the type mentioned at the outset are known from the prior art. The method is used for operating an electric motor arrangement having a microprocessor, a working memory and an electric motor. The electric motor can be commutated electronically and is therefore present, for example, as a brushless DC motor or a BL...
Claims
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IPC IPC(8): H02P27/08H02P6/08
CPCH02P6/085H02P27/08
Inventor G.舒尔策-伊金-科纳特
Owner ROBERT BOSCH GMBH